Abstract:The degradation kinetics of 3,3′,4,4′-tetrachlorobiphenyl (PCB77) by nanometer-sized iron and silicon were studied. PCB77 could be dechlorinated by nanometer-sized Fe0, Fe3O4 and Si0, which followed with the pseudo first-order reaction kinetics, and the reaction rates (Kobs) were 0.0177h-1, 0.0038 h-1 and 0.0045h-1, respectively. When the initial concentration of PCB77 was 5 mg/L, the amount of nanomaterials was 5 g/L and pH was at 4.5, the degradation efficiencies of nanometer-sized Fe0 to PCB77 was the highest,and the residual rate of PCB77 was 19.83% after 64 h and the concentration of chlorion was 50.3 μmol/L with significant change of pH from 4.5 to 5.26. Similarly, the degradation of PCB77 by nanometer-sized Fe0 and Si0, Fe3O4 and Si0 composition followed the pseudo first-order reaction kinetics, and the reaction rates (Kobs) were 0.0114 h-1 and 0.004 h-1 respectively. The degradation efficiencies of nanometer-sized Fe0 and Si0 composition were better than nanometer-sized Fe3O4 and Si0 combination, the residual rates of PCB77 were 34.91% and 66.62%, and the concentrations of chlorion were 40.07 μmol/L and 20.47 μmol/L without the change of pH. The degradation efficiencies of nanometer-sized Fe0 and Fe3O4 to PCB77 decreased with increasing of initial pH, while the degradation efficiencies of nanometer-sized Si0 to PCB77 increased with increasing of initial pH. The degradation efficiencies of nanometer-sized Fe0 and Si0, Fe3O4 and Si0 composition were not almost influenced by pH.
司雄元, 司友斌, 陈涛, 王寅, 陈倩倩. 纳米Fe、Si体系对3,3′,4,4′-四氯联苯的脱氯降解[J]. 中国环境科学, 2011, 31(5): 761-767.
SI Xiong-Yuan, SI You-Bin, CHEN Tao, WANG Yin, CHEN Qian-Qian. Dechlorinative degradation of 3,3′,4,4′-tetrachlorobiphenyl by nanometer-sized Fe and Si. CHINA ENVIRONMENTAL SCIENCECE, 2011, 31(5): 761-767.