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N-doped activated carbons from leather waste produced by microwave activation for use as the cathode of Li-S batteries
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作者 Carolina Pano-Azucena Roberto Rosas-Rangel +5 位作者 Miguel Olvera-Sosa David Salvador González-González Rene Rangel-Mendez Luis Felipe Chazaro-Ruiz Miguel Avalos-Borja Javier Antonio Arcibar-Orozco 《新型炭材料(中英文)》 北大核心 2025年第2期392-408,共17页
The use of carbon from waste biomass has the potential to eliminate the drawbacks of Li-S batteries and improve their overall performance.Chrome-tanned-leather-shavings(CTLS)are a readily available waste product that ... The use of carbon from waste biomass has the potential to eliminate the drawbacks of Li-S batteries and improve their overall performance.Chrome-tanned-leather-shavings(CTLS)are a readily available waste product that can be transformed into porous carbon.We prepared an ac-tivated carbon by microwave pyrolysis combined with KOH activator using the CTLS as starting materials.The carbon had a specific surface area of 556 m^(2)g^(-1) and a honeycomb-like structure.Two kinds of N-doped activated carbons were then synthesized by thermal decomposition of the activated carbon,either combined with urea,or impregnated with eth-anolamine.Both N-doped activated carbons have an in-creased number of nitrogen and amine surface groups.However,only the urea treatment was effective in improv-ing the initial capacity of the cell(1363 mAh g^(-1)),which is probably linked to the sorption of long-chain polysulfides.This investigation confirms that it is possible to use the thermal de-composition of urea to obtain carbon materials from CTLS for use as the sulfur-host cathode in Li-S batteries and improve their performance.A radial basis function neural network was fitted to provide statistical support for the experimental results,which confirmed the importance of the nitrogen content of the carbons in determining the discharge capacity of the cells. 展开更多
关键词 Leather wastes Microwave activation Lithium-sulfur battery Urea decomposition carbon material
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Effects of Lignite and Biochar on Enzyme Activity and Organic Carbon in Zn-contaminated Black Soil
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作者 Dai Jianjun Liu Zhaoting +1 位作者 Su Dezhen Wang Jingyi 《Journal of Northeast Agricultural University(English Edition)》 2025年第2期23-36,共14页
In order to explore the remediation effects of lignite and biochar on Zn-contaminated soil,this experiment studied the impacts of adding lignite and biochar on soil respiration,soil enzyme activity,and organic carbon ... In order to explore the remediation effects of lignite and biochar on Zn-contaminated soil,this experiment studied the impacts of adding lignite and biochar on soil respiration,soil enzyme activity,and organic carbon in Zn-contaminated soil through soil culture experiments,which provided a theoretical basis for the remediation and improvement as well as for the development and utilization of Zn-contaminated soil.The study was an L8(4×2^(2))orthogonal experimental design with eight treatments,in which there were four levels of Zn contamination concentration(Z0:0;Z1:125 mg•kg^(-1);Z2:250 mg•kg^(-1);Z3:500 mg•kg^(-1)),low-Zn(125-250 mg•kg^(-1))and high-Zn(500 mg•kg^(-1)),two levels of lignite(H0:0;H1:13.33 g•kg^(-1)),two levels of biochar(C0:0;C1:3.33 g•kg^(-1)),with four replicates per treatment.The results showed that lignite or biochar and their interaction had extremely significant effects on both respiration rate and accumulation in Zn-contaminated soil.Among the high Zn-contaminated treatments,the mixed application of lignite and biochar(Z3H1C1 treatment)had the fastest soil respiration rate and the highest soil respiration accumulation.Lignite,biochar and their interaction had significant or extremely significant effects on sucrase,catalase and polyphenol oxidase activities in Zn-contaminated soil.Among the high Zn-contaminated treatments(Z3),the addition of biochar alone had the most significant effects on the increase of soil sucrase and catalase enzyme activities,while the mixed application of lignite and biochar had the most significant effects on the increase of soil polyphenol oxidase activity.Lignite,biochar and their interaction had significant or extremely significant effects on the total organic carbon,active organic carbon and microbial carbon content of Zn-contaminated soils.Soil total organic carbon content in general peaked at day 80.Among the high Zn-contaminated treatments,the addition of biochar alone had the most significant effects on the total organic carbon content of the soil,while the mixed application of lignite and biochar had the most significant effect on the microbiomass carbon content. 展开更多
关键词 Zn pollution LIGNITE BIOCHAR enzyme activity organic carbon
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One-pot synthesis of PDDA-mediated CuO-functionalized activated carbon fabric for sarin detoxification with enhanced strength and permeability for NBC protective clothing
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作者 Himanshi Dhyani Ravindra V.Adivarekar +4 位作者 Vikas B.Thakare Suraj Bharati Ajay Dixit G.Raviraju Prabhat Garg 《Defence Technology(防务技术)》 2025年第6期67-82,共16页
Chemical warfare agents(CWAs)are extremely lethal substances used in warfare and terrorism,capable of causing permanent damage even in small doses,despite medical intervention.Therefore,detection,protection,and detoxi... Chemical warfare agents(CWAs)are extremely lethal substances used in warfare and terrorism,capable of causing permanent damage even in small doses,despite medical intervention.Therefore,detection,protection,and detoxification of CWAs are vital for the safety of first responders,military personnel,and civilians,driving significant research in this area.Herein,we designed and synthesized a poly(-diallyldimethylammonium chloride)(PDDA)mediated cupric oxide(CuO)functionalized activated carbon fabric(ACF),termed ACF@PDDA-CuO,as an adsorbent filter material for self-detoxifying chemical protective clothing.PDDA,a positively charged polyelectrolyte,effectively binds in-situ synthesized CuO to the negatively charged ACF surface,serving as a suitable binder.This study demonstrates the synergistic effects of PDDA-CuO functionalization on ACF,where PDDA treatment enhanced mechanical and comfort properties,and CuO crystal growth significantly improved detoxification efficacy against the CWA Nerve Agent Sarin.Comprehensive analyses,including FTIR,BET surface area analysis,SEM,EDS,TEM,STEM,TGA,XPS,and XRD,confirmed the uniform deposition of CuO and PDDA on the ACF surface.The Cu content on ACF@PDDA-CuO samples was measured via iodometric titration.The materials were evaluated for tensile strength,air permeability,water vapor permeability,nerve agent(Sarin)detoxification,and blister agent(Sulfur Mustard)breakthrough time to assess their applicability for protective clothing.The optimized PDDA-CuO on ACF detoxified 82.04%of Sarin within 18 h,compared to 25.22%by ACF alone,and enhanced tensile strength by 23.67%,air permeability by 24.63%,and water vapor permeability by 3.94%,while maintaining protection against Sulfur Mustard for 24 h.These findings indicate that ACF@PDDA-CuO is a promising candidate for CWA protective clothing,offering robust protection with enhanced comfort. 展开更多
关键词 Chemical warfare agents activated carbon fabric Cupric oxide Poly(diallyldimethylammonium chloride) Catalytic degradation
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Electromagnetic wave absorption performance of Fe_(3)O_(4)/activated carbon-natural resin nanocomposite
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作者 Mahsa Mahmoodi Bagher Aslibeiki +5 位作者 Reza Peymanfar Hamid Naghshara Rajesh Kumar Rajagopal Yue Zhao Davide Peddis Tapati Sarkar 《新型炭材料(中英文)》 SCIE EI CAS CSCD 北大核心 2024年第6期1157-1177,共21页
There has recently been a fundamental need to develop high efficiency microwave absorbers to reduce electro-magnet-ic pollution.It is often very difficult to obtain superior absorption with only one material,so we hav... There has recently been a fundamental need to develop high efficiency microwave absorbers to reduce electro-magnet-ic pollution.It is often very difficult to obtain superior absorption with only one material,so we have explored composites using fillers of activated carbon derived from biological material(oleaster seeds)and resin(apricot tree gum)with Fe_(3)O_(4) in a paraffin wax matrix to improve the dielectric properties and achieve a high specific surface area.A 1 mm thick layer of a Fe_(3)O_(4)+resin(FEOR),with the magnetic nanoparticles anchored to the gum,resulted in a reflection loss of−71.09 dB.We compared this with the results for composites using a filler of Fe_(3)O_(4)+activated carbon,and one with a three-component filler of Fe_(3)O_(4)+activated carbon+resin which had a very porous structure that had a direct effect on the surface polarization.However,the FEOR sample had near-ideal im-pedance matching,close to 1,which resulted in high absorption performance.In addition,the presence of defects improves mi-crowave attenuation by dipole polarization and charge carrier trapping.This work suggests the use of new types of biomaterials to in-crease microwave absorption. 展开更多
关键词 activated carbon Oleaster seeds Gum MAGNETITE Microwave absorption
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MgO-AC清净剂的制备及对糖汁的清净效果 被引量:1
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作者 唐婷范 李琦 +3 位作者 陈金足 邓琳 李利军 程昊 《食品与机械》 北大核心 2025年第4期172-178,共7页
[目的]解决制糖工业的末端产物赤砂糖的脱色难题。[方法]利用共沉淀法,经高温煅烧制备氧化镁—活性炭复合材料(MgO-AC)。使用X射线衍射仪(XRD)、红外光谱仪(FT-IR)、比表面积及孔隙度分析仪(BET)、扫描电子显微镜(SEM)等表征手段对所制... [目的]解决制糖工业的末端产物赤砂糖的脱色难题。[方法]利用共沉淀法,经高温煅烧制备氧化镁—活性炭复合材料(MgO-AC)。使用X射线衍射仪(XRD)、红外光谱仪(FT-IR)、比表面积及孔隙度分析仪(BET)、扫描电子显微镜(SEM)等表征手段对所制材料的形貌结构进行表征。将其应用于赤砂糖回溶糖浆脱色过程中,考察了MgO-AC质量浓度、反应温度、pH和吸附时间对脱色效果的影响,并设计正交试验选取最优方案。[结果]MgO成功负载到活性炭上,其平均孔径为3.27 nm,表面积为250.78 m2/g,呈片状结构。正交试验最优方案为MgO-AC质量浓度8 g/L,反应温度60℃,pH 5.00,吸附时间70 min,在此条件下清净效果最佳,脱色率为98%。[结论]负载大量MgO微粒的活性炭,兼具氧化镁的亲水性、碱性以及活性炭的吸附性,形成具有独特吸附性能的材料,显著提高了对回溶糖浆色素等非蔗糖杂质的吸附作用。 展开更多
关键词 赤砂糖 回溶糖浆 脱色 MGO 活性炭
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电化学阳极氧化法再生TiO_(2)&ACF处理油田采出水的试验研究
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作者 王冰 程海钰 +1 位作者 傅勇迪 王海曼 《沈阳建筑大学学报(自然科学版)》 北大核心 2025年第3期423-432,共10页
通过电化学阳极氧化法再生改性活性炭纤维(TiO_(2)&ACF),以提高其对油田采出水的处理效率。以溶胶-凝胶法和煅烧制备二氧化钛改性活性炭纤维,利用SEM、EDS、FTIR对改性活性炭纤维的表面形貌、元素分布及官能团组成进行表征分析,考察... 通过电化学阳极氧化法再生改性活性炭纤维(TiO_(2)&ACF),以提高其对油田采出水的处理效率。以溶胶-凝胶法和煅烧制备二氧化钛改性活性炭纤维,利用SEM、EDS、FTIR对改性活性炭纤维的表面形貌、元素分布及官能团组成进行表征分析,考察TiO_(2)&ACF对油田采出水的吸附性能,分析pH、电流密度、再生时间、NaCl溶液质量浓度等因素对TiO_(2)&ACF再生效果的影响以及多因素共同作用下TiO_(2)&ACF的最佳再生条件。TiO_(2)&ACF的吸附等温线符合Freundlich模型,吸附动力学符合伪二阶吸附动力学模型。电化学阳极氧化法对TiO_(2)&ACF的最佳再生条件为电流密度60 mA/cm^(2)、再生时间105 min、pH=3且NaCl溶液质量浓度为15 g/L,循环再生6次后,TiO_(2)&ACF的再生率达83.9%。电化学阳极氧化法对改性活性炭纤维再生具有良好的促进作用。 展开更多
关键词 改性活性炭纤维 油田采出水 电化学阳极氧化法 再生率
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Pressure swing adsorption modeling of acetone and toluene on activated carbon 被引量:3
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作者 唐琳 李立清 +2 位作者 邢俊东 刘峥 姚小龙 《Journal of Central South University》 SCIE EI CAS 2013年第10期2781-2790,共10页
A five steps pressure swing adsorption process was designed for acetone and toluene mixtures separation and recovery. Dynamic distributions of gas phase content and temperature were investigated. Based on the theory o... A five steps pressure swing adsorption process was designed for acetone and toluene mixtures separation and recovery. Dynamic distributions of gas phase content and temperature were investigated. Based on the theory of Soret and Dufour, a non-isothermal mathematical model was developed to simulate the PSA process. Effects of heat and mass transfer coefficients were studied. The coupled Soret and Dufour effects were also evaluated. It is found that the heat transfer coefficient has little effect on mass transfer in adsorption stage. However, it has some impacts in desorption stage. The maximum value of C/C0 increases by about 25% as heat transfer coefficient decreases. The temperature variation is less than 0.05 K with the change of mass transfer coefficient, so that the effect of mass transfer coefficient on heat transfer can be ignored. It is also concluded that the Soret and Dufour coupled effects are not obvious in pressure swing adsorption compared with fixed-bed adsorption. 展开更多
关键词 pressure SWING adsorption heat TRANSFER mass TRANSFER SORET and Dufour effects activATED carbon
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Adsorption characteristics of carbon tetrachloride from aqueous solution onto polyacrylonitrile-based activated carbon fiber 被引量:5
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作者 刘文霞 官宝红 于洁 《Journal of Central South University》 SCIE EI CAS 2010年第5期972-978,共7页
The isotherm,mechanism and kinetics of carbon tetrachloride(CT) adsorption by polyacrylonitrile-based activated carbon fiber(PAN-ACF) were investigated in batch reactors and a continuous flow reactor,and the regenerat... The isotherm,mechanism and kinetics of carbon tetrachloride(CT) adsorption by polyacrylonitrile-based activated carbon fiber(PAN-ACF) were investigated in batch reactors and a continuous flow reactor,and the regeneration of PAN-ACF was also studied.Freundlich and Dubinin-Radushkevich(D-R) adsorption equations can well describe the adsorption isotherm.CT is mainly adsorbed on the exterior surface of PAN-ACF with low boundary layer effect and rate-controlling step of intra-particle diffusion.The adsorption dynamics in the batch reactor well fits with the pseudo-first-order model,and the breakthrough curves in the continuous flow reactor can be well described by the Yoon-Nelson model.The ACF can be recycled through thermal regeneration,whereas the adsorption capacity decreases from 7.87 to 4.98 mg/g after the fourth regeneration.78%-94%of CT can be removed from the wastewater of a fluorine chemical plant on a pilot scale,which confirms the efficacy of ACF under industrial conditions.The results indicate that PAN-ACF is applicable to CT removal from wastewater. 展开更多
关键词 ADSORPTION carbon tetrachloride activated carbon fiber ISOTHERM KINETICS breakthrough curve
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Treatment of flotation wastewater using biological activated carbon 被引量:10
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作者 董颖博 林海 +1 位作者 刘泉利 霍汉鑫 《Journal of Central South University》 SCIE EI CAS 2014年第9期3580-3587,共8页
A laboratory scale up-flow biological activated carbon(BAC) reactor was constructed for the advanced treatment of synthetic flotation wastewater. Biodegradation of a common collector(i.e., ethyl xanthate) for non-ferr... A laboratory scale up-flow biological activated carbon(BAC) reactor was constructed for the advanced treatment of synthetic flotation wastewater. Biodegradation of a common collector(i.e., ethyl xanthate) for non-ferrous metallic ore flotation was evaluated. The results show that the two stages of domestication can improve microbial degradation ability. The BAC reactor obtains a chemical oxygen demand(COD) reduction rate of 82.5% for ethyl xanthate and its effluent COD concentration lowers to below 20 mg/L. The kinetics equation of the BAC reactor proves that the activated carbon layers at the height of 0 mm to 70 mm play a key role in the removal of flotation reagents. Ultraviolet spectral analysis indicates that most of the ethyl xanthate are degraded by microorganisms after advanced treatment by the BAC reactor. 展开更多
关键词 flotation wastewater biological activated carbon BIODEGRADATION chemical oxygen demand
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Adsorption of volatile organic compounds on three activated carbon samples:Effect of pore structure 被引量:11
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作者 李立清 宋剑飞 +3 位作者 姚小龙 黄贵杰 刘峥 唐琳 《Journal of Central South University》 SCIE EI CAS 2012年第12期3530-3539,共10页
To investigate the influence of the activated carbon pore structure on the adsorption of volatile organic compounds (VOCs), three commercial activated carbon samples were chosen. The fixed-bed thermostatic adsorptio... To investigate the influence of the activated carbon pore structure on the adsorption of volatile organic compounds (VOCs), three commercial activated carbon samples were chosen. The fixed-bed thermostatic adsorption experiments were conducted under certain conditions, where toluene, acetone, and 1, 2-dichloroethane acted as adsorbents. Then, the incidence relation between the experimental results and the activated carbon pore structure was analyzed. After that, the results of the correlation analysis were verified in accordance with fractal theory and adsorption characteristic curve analysis. The results show that the pore diameter gradient is helpful for strengthening the intemal diffusion. Under the same condition, the adsorption of organic gases tends to be selective, and the positions of toluene, acetone and 1, 2-dichloroethane adsorbed on the activated carbon are mainly in the ranges of 1.27-1.49 nm, 0.67-0.84 nm and 1.39-1.75 nm, respectively. The relationship between adsorption capacity and activated carbon pore volume can accurately explain the spreading process of the adsorbents in the activated carbon. 展开更多
关键词 activated carbon volatile organic compounds ADSORPTION pore structure SELECTIVITY
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Catalytic ozonation of phenol and oxalic acid with copper-loaded activated carbon 被引量:9
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作者 饶义飞 罗汉金 +1 位作者 韦朝海 罗凌峰 《Journal of Central South University》 SCIE EI CAS 2010年第2期300-306,共7页
A novel heterogeneous catalytic ozonation process in water treatment was studied, with a copper-loaded activated carbon (Cu/AC) that was prepared by an incipient wetness impregnation method at low temperature and te... A novel heterogeneous catalytic ozonation process in water treatment was studied, with a copper-loaded activated carbon (Cu/AC) that was prepared by an incipient wetness impregnation method at low temperature and tested as a catalyst in the ozonation of phenol and oxalic acid. Cu/AC was characterized using XRD, BET and SEM techniques. Compared with ozonation alone, the presence of Cu/AC in the ozonation processes significantly improves the degradation of phenol or oxalic acid. With the introduction of the hydroxyl radical scavenger, i.e., turt-butanol alcohol (t-BuOH), the degradation efficiency of both phenol and oxalic acid in the Cu/AC catalyzed ozonation process decreases by 22% at 30 min. This indicates that Cu/AC accelerates ozone decomposition into certain concentration of hydroxyl radicals. The amount of Cu(II ) produced during the reaction of Cu/AC-catalyzed ozonation of phenol or oxalic acid is very small, which shows that the two processes are both heterogeneous catalytic ozonation reactions. 展开更多
关键词 copper-loaded activated carbon PHENOL oxalic acid hydroxyl radical catalytic ozonation
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Influence of KOH activation techniques on pore structure and electrochemical property of carbon electrode materials 被引量:6
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作者 李晶 李劼 +3 位作者 赖延清 宋海申 张治安 刘业翔 《Journal of Central South University of Technology》 EI 2006年第4期360-366,共7页
Taking the selection of coal-tar pitch as precursor and KOH as activated agent, the activated carbon electrode material was fabricated for supercapacitor.The surface area and the pore structure of activated carbon wer... Taking the selection of coal-tar pitch as precursor and KOH as activated agent, the activated carbon electrode material was fabricated for supercapacitor.The surface area and the pore structure of activated carbon were analyzed by Nitro adsorption method. The electrochemical properties of the activated carbons were determined using two-electrode capacitors in 6 mol/L KOH aqueous electrolytes. The influences of activated temperature and mass ratio of KOH to C on the pore structure and electrochemical property of porous activated carbon were investigated in detail. The reasons for the changes of pore structure and electrochemical performance of activated carbon prepared under different conditions were also discussed theoretically. The results indicate that the maximum specific capacitance of 240 F/g can be obtained in alkaline medium, and the surface area, the pore structure and the specific capacitance of activated carbon depend on the treatment methods; the capacitance variation of activated carbon cannot be interpreted only by the change of surface area and pore structure, the lattice order and the electrolyte wetting effect of the activated carbon should also be taken into account. 展开更多
关键词 SUPERCAPacITOR activated carbon chemical activation pore structure specific capacitance
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Characteristics of activated carbon prepared from Chinese fir sawdust by zinc chloride activation under vacuum condition 被引量:4
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作者 丘克强 杨素文 杨娟 《Journal of Central South University》 SCIE EI CAS 2009年第3期385-391,共7页
The preparation of activated carbon from Chinese fir sawdust by zinc chloride activation under both nitrogen atmosphere and vacuum conditions was carded out in a self-manufactured vacuum pyrolysis reactor. The effects... The preparation of activated carbon from Chinese fir sawdust by zinc chloride activation under both nitrogen atmosphere and vacuum conditions was carded out in a self-manufactured vacuum pyrolysis reactor. The effects of the system pressure and the activation condition (nitrogen or vacuum) on pore development were investigated. The results show that both high quality activated carbon and high added-value bio-oil can be obtained simultaneously via vacuum chemical activation. The characteristics of the activated carbons produced under vacuum conditions are better than those prepared under nitrogen atmosphere. The performance parameters of the activated carbon obtained under vacuum conditions are as follows: the pore size distribution is mainly microporous, the Brunauer-Emmett-Teller (BET) surface area is 1 070.59 m^2/g, the microporous volume is 0.502 4 cm^3/g, the average pore size is 2.085 nm, and the iodine adsorption value and the methylene blue adsorption value are 1 142.92 and 131.34 mg/g, respectively. The activated carbon from vacuum chemical activation has developed micropores, and the N2 adsorption equilibrium constant of the corresponding activated carbon gradually increases with the decrease of reaction system pressure. 展开更多
关键词 activated carbon BIO-OIL Chinese fir sawdust system pressure vacuum chemical activation
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Preparation and electrochemical characterization of activated carbons by chemical-physical activation 被引量:4
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作者 张治安 崔沐 +2 位作者 赖延清 李劼 刘业翔 《Journal of Central South University》 SCIE EI CAS 2009年第1期91-95,共5页
A process was proposed based on the combination of chemical and physical activation for the production of activated carbons used as the electrode material for electric double layer capacitor (EDLC). By material charac... A process was proposed based on the combination of chemical and physical activation for the production of activated carbons used as the electrode material for electric double layer capacitor (EDLC). By material characterization and electrochemical methods, the influences of the activitation process on the specific surface area, pore structure and electrochemical properties of the activated carbons were investigated. The results show that specific surface area, the mesopore volume, and the specific capacitance increase with the increase of the mass ratio of KOH to char (m(KOH)/m(char)) and the activation time, respectively. When m(KOH)/m(char) is 4.0, the specific surface area and the mesopore volume reach the maximum values, i.e. 1 960 m2/g and 0.308 4 cm3/g, and the specific capacitance is 120.7 F/g synchronously. Compared with the chemical activation, the activated carbons prepared by chemical-physical activation show a larger mesopore volume, a higher ratio of mesopore and a larger specific capacitance. 展开更多
关键词 activated carbon electric double layer capacitor chemical-physical activation pore structure
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Anaerobic hydrogen production of molasses from mixed microbial communities immobilized by activated granular carbon 被引量:2
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作者 李永峰 赵倩 《化工进展》 EI CAS CSCD 北大核心 2012年第S1期384-392,共9页
Molasses wastewater was evaluated as substrate for biohydrogen production by anaerobic fermentation in a novel continuous mixed attached growth reactor ( CMAGR ) with aeration pretreated sludge attached onto granular ... Molasses wastewater was evaluated as substrate for biohydrogen production by anaerobic fermentation in a novel continuous mixed attached growth reactor ( CMAGR ) with aeration pretreated sludge attached onto granular activated carbon under continuous flow condition.It was indicated that the CMAGR system was operated at the conditions of influent COD of 2000~6000mg / L , hydraulic retention time ( HRT ) of 6hand temperature of 35 ℃ , when the pH value and oxidation-reduction potential ( ORP ) ranged from 4.16and-434 mV respectively , stable ethanol-type fermentation was formed with the sum of ethanol and acetate concentration ratio of 89.3%to the total liquid products after 40days operation.The H 2 content in biogas and chemical oxygen demand ( COD ) removal were estimated to be 46.6% and 13% , respectively.It was also investigated that the effects of organic loading rates ( OLRs ) on CMAGR hydrogen production system.It was found that hydrogen production yield increased from 3.72 mmol / hL to 12.51 mmol / hL as OLRs increased from 8 kg / m 3 d to 32 kg / m 3 d.The maximum hydrogen production rate of 12.51mmol / hL at a OLR of 32kg / m 3 d and the maximum hydrogen yield by substrate consumed was 130.57 mmol / mol happened at OLR of 16 kg / m 3 d.Greater pHs appeared to be favour to butyrate production and the maximum of 0.51mol / mol was obtained at pH of 4.14.However , ethanol / acetate ratio was greater than 1.1at pH fluctuated between 3.4 - 3.6and 4.1 - 4.4which indicated that these pHs were favour to ethanol type fermentation.Therefore , the continuous mixed attached growth reactor ( CMAGR ) could be a promising attached growth system for biohydrogen fermentation. 展开更多
关键词 BIOHYDROGEN production continuous MIXED ATTacHED growth reactor molasess WASTEWATER activATED granular carbon WASTEWATER treatment
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Preparation of activated carbons from mesophase pitch and their electrochemical properties 被引量:4
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作者 赖延清 李晶 +3 位作者 宋海申 张治安 李劼 刘业翔 《Journal of Central South University of Technology》 EI 2007年第5期633-637,共5页
The influences of molar ratio of KOH to C and activated temperature on the pore structure and electrochemical property of porous activated carbon from mesophase pitch activated by KOH were investigated. The surface ar... The influences of molar ratio of KOH to C and activated temperature on the pore structure and electrochemical property of porous activated carbon from mesophase pitch activated by KOH were investigated. The surface areas and the pore structures of activated carbons were analyzed by nitrogen adsorption, and the electrochemical properties of the activated carbons were studied using two-electrode capacitors in organic electrolyte. The results indicate that the maximum surface area of 3 190 m2/g is obtained at molar ratio of KOH to C of 5:1, the maximum specific capacitance of 122 F/g is attained at molar ratio of KOH to C of 4:1, and 800 ℃ is the proper temperature to obtain the maximum surface area and capacitance. 展开更多
关键词 SUPERCAPacITOR activated carbon mesophase pitch chemical activation pore structure electrochemical properties
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Adsorption of residual amine collector HAY from aqueous solution by refined carbon from coal fly ash and activated carbon 被引量:3
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作者 李显波 叶军建 +4 位作者 邱跃琴 李龙江 卯松 刘志红 张覃 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第1期30-38,共9页
Refined carbon(RC) derived from coal fly ash(CFA) as well as powdered activated carbon(PAC) was investigated as adsorbent to remove residual amine collector HAY from aqueous solution.The RC and PAC were characterized ... Refined carbon(RC) derived from coal fly ash(CFA) as well as powdered activated carbon(PAC) was investigated as adsorbent to remove residual amine collector HAY from aqueous solution.The RC and PAC were characterized by scanning electron microscopy(SEM),surface area measurement,Zeta potential measurement and Fourier transform infrared(FTIR) spectroscopy.The effect factors and mechanisms of HAY adsorption onto RC and PAC were studied in detail.The results show that the experimental kinetic data agree well with the pseudo second-order equation,and the Langmuir isotherm model is found to be more appropriate to explicate the experimental equilibrium isotherm results than the Freundlich model.The adsorption capacities of PAC and RC increase with pH.It is found that alkaline condition is conducive to the adsorption of HAY onto PAC and RC and the adsorption efficiency of RC is close to PAC at pH near 11.Zeta potential variation of adsorbents suggests that HAY generates electrostatic adsorption onto RC and PAC.FTIR analysis shows that the adsorption is dominantly of a physical process.The Box-Behnken design optimization conditions of process are RC 1 g/L,pH 11,temperature 302 K and initial HAY concentration 100 mg/L.Under these conditions,the measured adsorption ratio and adsorption capacity are 87.91%and 87.91 mg/g,respectively.Thus,the RC is considered to be a potential adsorbent for the removal of residual amine from aqueous solution. 展开更多
关键词 powdered activated carbon coal fly ash refined carbon ADSORPTION amine collector HAY
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NO adsorption and temperature programmed desorption on K_2CO_3 modified activated carbons 被引量:2
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作者 YANG Dai-jun MA Xiao-wei +2 位作者 LV Hong LI Bing ZHANG Cun-man 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第10期2339-2348,共10页
Fuel cell stacks as the automotive power source can be severely poisoned by a trace amount of NOx in atmosphere,which makes it necessary to provide clean air for fuel cell vehicles.In this work,activating commercial a... Fuel cell stacks as the automotive power source can be severely poisoned by a trace amount of NOx in atmosphere,which makes it necessary to provide clean air for fuel cell vehicles.In this work,activating commercial activated carbons with K2CO3 for the large enhancement of NO capture was studied.K2CO3 modified activated carbons(K2CO3 ACs)were prepared by impregnating activate carbons in K2CO3 solution under ultrasound treatment,followed by temperature programmed baking at 800 oC.The dynamic NO flow tests on K2CO3 ACs at room temperature indicated that NO adsorption capacity reached the maximum(96 mg/g)when K2CO3 loading was 19.5 wt%,which corresponded to a specific surface area of 1196.1 m2/g and total pore volume of 0.70 cm3/g.The ten-fold enhancement of NO adsorption on K2CO3 ACs compared to the unimpregnated activated carbon was mainly attributed to the formation of potassium nitrite,which was confirmed by FTIR and temperature programmed desorption measurements.Regeneration tests of NO adsorption on the optimum sample revealed that 76%of the NO adsorption capacity could be remained after the fourth cycle. 展开更多
关键词 activated carbon potassium carbonate MODIFICATION NO adsorption temperature programmed desorption
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Self-assembled activated carbon sandwiched graphene film for symmetrical supercapacitors 被引量:2
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作者 WU Yuan-yuan ZHU Lian-wen +3 位作者 CHEN Ru-ting GU Li CAO Xue-bo LU Shao-rong 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第12期3603-3614,共12页
Activated carbon(AC)particles sandwiched reduced graphene oxide sheets(rGO)film has been successfully fabricated via a facile self-assemble approach.The as-formed AC/rGO film is self-standing,flexible and mechanically... Activated carbon(AC)particles sandwiched reduced graphene oxide sheets(rGO)film has been successfully fabricated via a facile self-assemble approach.The as-formed AC/rGO film is self-standing,flexible and mechanically robust,allowing to be transferred to any substrate on demand without rupture.Since AC particles effectively suppressed the restacking of the rGO sheet,AC/rGO film exhibits loose layer-by-layer stacking structures with various gaps between AC particles and rGO sheets,which is different from compact structures of pure graphene films.The as-formed gaps provide fast diffusion channels for electrolyte ions and enhanced accessible surface area of rGO.Therefore,the AC/rGO electrode delivers improved electrochemical performance over the voltage range of 0.0−3.0 V.This work offers a promising strategy to design free-standing supercapacitor electrodes based on traditional nanocarbon materials. 展开更多
关键词 graphene film activated carbon self-assembly supercapacitor
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Adsorption removal of endosulfan through Saccharum officinarum derived activated carbon from selected soils 被引量:2
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作者 Khuram Shahzad AHMAD 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第1期146-157,共12页
Pesticide contamination causes precarious implications on human health and environment.Thus the investigation of its sorption phenomenon is highly imperative.Endosulfan insecticide was examined for its adsorption beha... Pesticide contamination causes precarious implications on human health and environment.Thus the investigation of its sorption phenomenon is highly imperative.Endosulfan insecticide was examined for its adsorption behavior on ten assorted soils through batch equilibrium method.Adsorption coefficient values(Kd)ranged from 1.4μg/mL to 18μg/mL.The highest Kd value was obtained for Peshawar soil owing to the presence of highest amount of organic matter(1.4%).Negative values of Gibbs free energy displayed a low interaction between soil and pesticide,exhibiting that the reaction was physiosorption and exothermic in nature.Statistical analysis showed a negative correlation of soil pH and Kd(R^2=–0.77 and p=0.03)and a positive correlation with organic matter(R^2=0.96).Activated carbon prepared from Saccharum officinarum bagasse removed significant amount pesticide.The maximum removal observed was 93%and 97%in 5×10^–6 and 7.5×10^–6,respectively.Activated carbon prepared from biomass for removal purposes was proved to be highly efficient and cost effective. 展开更多
关键词 soil ENDOSULFAN ADSORPTION activated carbon sugarcane husk
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