Flotation is often employed to separate valuable natural minerals and gangue minerals.However,few studies have been conducted on artificial mineral flotation.Anosovite,the primary mineral in titanium slag,is a typical...Flotation is often employed to separate valuable natural minerals and gangue minerals.However,few studies have been conducted on artificial mineral flotation.Anosovite,the primary mineral in titanium slag,is a typical artificial mineral that can be enriched by flotation.In the present work,flotation behavior and adsorption mechanism of anosovite in salicylhydroxamic acid(SHA)solution were studied.The influence of pH and SHA dosage on anosovite flotability was investigated.Micro-flotation test results show that a pH range of 7–8.5 is available for SHA to collect anosovite.A maximum recovery of 93.26%can be obtained with SHA dosage of only 4×10.5 mol/L.In addition,TOC,zeta potential,FTIR,SEM-EDS,and XPS analyses were used to study the adsorption mechanism.Results demonstrated that SHA adsorption is governed by chemisorption.XPS studies further suggested that chemical adsorption occurred at the Ti sites on the anosovite surface.展开更多
For the determination of salicylaldoxime in environmental water samples,a stable and rapid method with low detection was proposed and established,based on the liquid-liquid extraction-high performance liquid chromatog...For the determination of salicylaldoxime in environmental water samples,a stable and rapid method with low detection was proposed and established,based on the liquid-liquid extraction-high performance liquid chromatography with ultraviolet detector.Parameters including extraction solvent,ionic strength,solution pH,and extraction pattern were discussed for the optimal quantification of salicylaldoxime-spiked water.When the described method was applied to four spiked water samples,the obtained average extraction recovery rate was found between 87%–107%and relative standard deviation was below 6%.At the same time,good linear relationships were observed for spiked water samples from 0.01 to 10μg/mL(R2=0.9993).In addition,the detection limit of salicylaldoxime was revealed between 0.003–0.008μg/mL,which is two orders of magnitude lower than previously reported results.Thus,the presented method may be advantageous for the high-efficiency determination of salicylaldoxime in water samples.展开更多
To improve the adsorption properties of chemically modified chitosan, the chelating resin of salicylal chitosan Schiff bases was prepared by the template cross-linking method using Cu（Ⅱ） as template ion and ethylen...To improve the adsorption properties of chemically modified chitosan, the chelating resin of salicylal chitosan Schiff bases was prepared by the template cross-linking method using Cu（Ⅱ） as template ion and ethylene glycol bisglycidyl ether as cross-linking agent in microwave, and was characterized by IR. The adsorption capacity and selectivity coefficient of the chemically modified chitosan for Cu（Ⅱ）, Fe（Ⅲ） and Zn（Ⅱ） were investigated, respectively. The results show that the adsorption capacity of the resin 2.73 mmol/g for Cu（Ⅱ） is bigger than that for other two metal ions, 0.22 mmol/g for Fe（Ⅲ）, and 0.42 mmol/g for Zn（Ⅱ）, and the selectivity coefficients are as follows: KCu（Ⅱ）/Fe（Ⅲ）=12.4, KCu（Ⅱ）/Zn（Ⅱ）=6.5.展开更多
Abstract： A simple optimized microplate-based method to assay endo-1,4-β-mannosidase activity was described as an improved high-throughput screening method. A series of experimental conditions were optimized. It is ...Abstract： A simple optimized microplate-based method to assay endo-1,4-β-mannosidase activity was described as an improved high-throughput screening method. A series of experimental conditions were optimized. It is revealed that the optimum measurement procedure is as follows： adding 50μL of diluted enzyme sample and 50 μL substrate, incubating at 45 ℃ for exactly 5 min in micro-plate, mixing with 100 μL 3,5-dinitrosalicylic acid （DNS） reagent, maintaining at boiling point for 15 rain, cooling down to room temperature before determining the ABS value at 540 nm using an ELISA micro-plate reader. The reaction volume of the optimized microplate-assay is reduced to 200μL from 2 500 μL used in the standard β-mannanase macro-assay. The optimized micro-assay is significantly more sensitive in all of the 643 candidates during endo-1,4-β-mannosidase screening. Statistical analyses show that the sensitivity of the optimized micro-method is significantly greater than that of the macro-assay. The optimized method is convenient, fast, and cheap for high throughput enzyme screening.展开更多
Hydrogen sulfide in rural biogas was removed with liquid-phase catalytic oxidation.By using rare earth as catalyst,and sulfosalicylic acid as stabilizer,H2S purification efficiency could increase as high as 96%,and su...Hydrogen sulfide in rural biogas was removed with liquid-phase catalytic oxidation.By using rare earth as catalyst,and sulfosalicylic acid as stabilizer,H2S purification efficiency could increase as high as 96%,and sulfur capacity of the composite solution was about 3 g/L.The results show that purification efficiency was affected by catalyst addition,pH,experimental temperature,and sulfur capacity.The parameters effects on catalytic oxidation were studied,and the optimized conditions were that Fe3+ concentration 0.08 mg/L,reaction temperature 70°C,pH 9.0,with a absorption solution volume of 50 mL,a gas flow rate 200 mL/min,and H2S mass concentration of 1.58-2.02 mg/m3.展开更多
基金Project(51090385) supported by the Major Program of the National Natural Science Foundation of ChinaProjects(121102000000160001,121102000000170013) supported by the Ministry of Land and Resources Department Budget,China+1 种基金Project(DD20179133) supported by the Geological Survey and Evaluation Project of ChinaProject(2018M641439) supported by China Postdoctoral Science Foundation
文摘Flotation is often employed to separate valuable natural minerals and gangue minerals.However,few studies have been conducted on artificial mineral flotation.Anosovite,the primary mineral in titanium slag,is a typical artificial mineral that can be enriched by flotation.In the present work,flotation behavior and adsorption mechanism of anosovite in salicylhydroxamic acid(SHA)solution were studied.The influence of pH and SHA dosage on anosovite flotability was investigated.Micro-flotation test results show that a pH range of 7–8.5 is available for SHA to collect anosovite.A maximum recovery of 93.26%can be obtained with SHA dosage of only 4×10.5 mol/L.In addition,TOC,zeta potential,FTIR,SEM-EDS,and XPS analyses were used to study the adsorption mechanism.Results demonstrated that SHA adsorption is governed by chemisorption.XPS studies further suggested that chemical adsorption occurred at the Ti sites on the anosovite surface.
基金Project(201309052)supported by the National Special Fund for Scientific Research in the Public InterestProject(2013FJ2003)supported by the Science and Technology Planning Project of Hunan Province of China
文摘For the determination of salicylaldoxime in environmental water samples,a stable and rapid method with low detection was proposed and established,based on the liquid-liquid extraction-high performance liquid chromatography with ultraviolet detector.Parameters including extraction solvent,ionic strength,solution pH,and extraction pattern were discussed for the optimal quantification of salicylaldoxime-spiked water.When the described method was applied to four spiked water samples,the obtained average extraction recovery rate was found between 87%–107%and relative standard deviation was below 6%.At the same time,good linear relationships were observed for spiked water samples from 0.01 to 10μg/mL(R2=0.9993).In addition,the detection limit of salicylaldoxime was revealed between 0.003–0.008μg/mL,which is two orders of magnitude lower than previously reported results.Thus,the presented method may be advantageous for the high-efficiency determination of salicylaldoxime in water samples.
文摘To improve the adsorption properties of chemically modified chitosan, the chelating resin of salicylal chitosan Schiff bases was prepared by the template cross-linking method using Cu（Ⅱ） as template ion and ethylene glycol bisglycidyl ether as cross-linking agent in microwave, and was characterized by IR. The adsorption capacity and selectivity coefficient of the chemically modified chitosan for Cu（Ⅱ）, Fe（Ⅲ） and Zn（Ⅱ） were investigated, respectively. The results show that the adsorption capacity of the resin 2.73 mmol/g for Cu（Ⅱ） is bigger than that for other two metal ions, 0.22 mmol/g for Fe（Ⅲ）, and 0.42 mmol/g for Zn（Ⅱ）, and the selectivity coefficients are as follows: KCu（Ⅱ）/Fe（Ⅲ）=12.4, KCu（Ⅱ）/Zn（Ⅱ）=6.5.
基金Project(31000350)supported by the National Natural Science Foundation of China
文摘Abstract： A simple optimized microplate-based method to assay endo-1,4-β-mannosidase activity was described as an improved high-throughput screening method. A series of experimental conditions were optimized. It is revealed that the optimum measurement procedure is as follows： adding 50μL of diluted enzyme sample and 50 μL substrate, incubating at 45 ℃ for exactly 5 min in micro-plate, mixing with 100 μL 3,5-dinitrosalicylic acid （DNS） reagent, maintaining at boiling point for 15 rain, cooling down to room temperature before determining the ABS value at 540 nm using an ELISA micro-plate reader. The reaction volume of the optimized microplate-assay is reduced to 200μL from 2 500 μL used in the standard β-mannanase macro-assay. The optimized micro-assay is significantly more sensitive in all of the 643 candidates during endo-1,4-β-mannosidase screening. Statistical analyses show that the sensitivity of the optimized micro-method is significantly greater than that of the macro-assay. The optimized method is convenient, fast, and cheap for high throughput enzyme screening.
基金Project(2008ZX07105-002) supported by the Erhai Lake Project of National Science and Technology Major Project in the 11th Five years Plan of China
文摘Hydrogen sulfide in rural biogas was removed with liquid-phase catalytic oxidation.By using rare earth as catalyst,and sulfosalicylic acid as stabilizer,H2S purification efficiency could increase as high as 96%,and sulfur capacity of the composite solution was about 3 g/L.The results show that purification efficiency was affected by catalyst addition,pH,experimental temperature,and sulfur capacity.The parameters effects on catalytic oxidation were studied,and the optimized conditions were that Fe3+ concentration 0.08 mg/L,reaction temperature 70°C,pH 9.0,with a absorption solution volume of 50 mL,a gas flow rate 200 mL/min,and H2S mass concentration of 1.58-2.02 mg/m3.
