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
The effects of different amounts of carbon and nitrogen sources on the soil microbial biomass carbon,dissolved organic carbon and related enzyme activities were studied by the simulation experiment of rice straw retur...The effects of different amounts of carbon and nitrogen sources on the soil microbial biomass carbon,dissolved organic carbon and related enzyme activities were studied by the simulation experiment of rice straw returning to the field,and the mechanism of the decomposition of rice straw returning to the field was discussed.Completely randomized experiment of the two factors of the three levels was designed,and a total of nine treatments of indoor soil incubation tests were conducted.Full amount of rice straw was applied to the soil in this simulation experiment and different amounts of brown sugar and urea were added in the three levels of 0(no carbon source and nitrogen source),1(low levels of carbon and nitrogen sources)and 2(high levels of carbon and nitrogen sources),respectively.The results showed that the addition of different amounts of carbon and nitrogen sources to the rice straw could increase the soil carbon content.Compared with T0N0,the microbial biomass carbon of T2N2 was increased significantly by 170.48%;the dissolved organic carbon content of T1N2 was significantly increased by 58.14%and the free humic acid carbon contents of T0N2,T1N1 and T2N0 were significantly increased by 56.16%and 45.55%and 47.80%,respectively;however,there were no significant differences among those of treatments at later incubation periods.The addition of different carbon and nitrogen sources could promote the soil enzyme activities.During the incubation period,all of the soil enzyme activities of adding sugar and urea were higher than those of T0N0 treatment.Therefore,the addition of different amounts of carbon and nitrogen sources to rice straw returning could improve soil microbial biomass carbon content,dissolved organic carbon and soil enzyme activities.展开更多
本文以稻壳基多孔炭为载体,采用硼氢化钠为还原剂,制备了非贵金属负载复合材料,即Fe-AC、Co-AC和Ni-AC。采用XRD、SEM、BET和XPS分别表征复合材料的物理化学性质。将复合材料分别制成的复合电极,在1 M KOH的三电极体系中,利用循环伏安...本文以稻壳基多孔炭为载体,采用硼氢化钠为还原剂,制备了非贵金属负载复合材料,即Fe-AC、Co-AC和Ni-AC。采用XRD、SEM、BET和XPS分别表征复合材料的物理化学性质。将复合材料分别制成的复合电极,在1 M KOH的三电极体系中,利用循环伏安、交流阻抗、电化学活性表面积(ECSA)、塔菲尔斜率等方法研究复合电极电催化氧化肼(HzOR)的性能与机理。结果表明,成功地获得了非贵金属包膜多孔炭复合材料,并成功地应用于碱体系的电催化氧化肼中。综合性能推断,其中Co-AC比表面积可达到804.4 m^(2)/g,Co-AC表现出最高的ECSA为49.3 cm^(2),扫速为10 mV/s时反应速率最快,并且能在大于100 mA/cm^(2)的电流密度下保持持续稳定工作,说明具有良好的稳定性。展开更多
文摘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.
基金Supported by the National Key Research and Development Plan Project(2016YFD0300909-04)。
文摘The effects of different amounts of carbon and nitrogen sources on the soil microbial biomass carbon,dissolved organic carbon and related enzyme activities were studied by the simulation experiment of rice straw returning to the field,and the mechanism of the decomposition of rice straw returning to the field was discussed.Completely randomized experiment of the two factors of the three levels was designed,and a total of nine treatments of indoor soil incubation tests were conducted.Full amount of rice straw was applied to the soil in this simulation experiment and different amounts of brown sugar and urea were added in the three levels of 0(no carbon source and nitrogen source),1(low levels of carbon and nitrogen sources)and 2(high levels of carbon and nitrogen sources),respectively.The results showed that the addition of different amounts of carbon and nitrogen sources to the rice straw could increase the soil carbon content.Compared with T0N0,the microbial biomass carbon of T2N2 was increased significantly by 170.48%;the dissolved organic carbon content of T1N2 was significantly increased by 58.14%and the free humic acid carbon contents of T0N2,T1N1 and T2N0 were significantly increased by 56.16%and 45.55%and 47.80%,respectively;however,there were no significant differences among those of treatments at later incubation periods.The addition of different carbon and nitrogen sources could promote the soil enzyme activities.During the incubation period,all of the soil enzyme activities of adding sugar and urea were higher than those of T0N0 treatment.Therefore,the addition of different amounts of carbon and nitrogen sources to rice straw returning could improve soil microbial biomass carbon content,dissolved organic carbon and soil enzyme activities.
