作 者：
程波;吴康;司雄元;王寅;檀华蓉;司友斌
单 位：
安徽农业大学资源与环境学院;安徽农业大学生物技术中心
关键词：
纳米Fe0;纳米Si0;纳米Fe3O4;黄褐土;PCB77;降解
摘 要：
采用振荡培养实验研究了纳米Fe0、纳米Si0和纳米Fe3O4对黄褐土中PCB77的降解作用。结果表明,土壤中PCB77投加量为20 mg kg-1,仅投加纳米Fe0时,投加量为40 mg g-1,反应24 h后PCB77含量接近最低,纳米Fe0对灭菌和未灭菌土壤中的PCB77降解过程均符合一级反应动力学,反应速率常数Kobs分别为0.0057 h-1和0.0081 h-1;反应64h后,反应体系中PCB77残留率分别为68.2%,和53.2%,可见灭菌土壤较未灭菌土壤中PCB77降解效果降低。纳米双元体系能促进PCB77的降解,当纳米Si0:纳米Fe0=1∶10时,土壤中PCB77降解效果最好,反应64h后,土壤中PCB77残留率仅为53%,当纳米Fe3O4∶纳米Fe0=1∶4时,土壤中PCB77降解效果较佳,反应64h后,土壤中PCB77残留率仅为42.5%。土壤中PCB77降解产物中除联苯外未发现其他降解产物,可能是PCB77在纳米Fe0表面连续脱氯的原因造成的。
译 名：
Degradation of PCB77 in Yellow-Cinnamon Soil by Nano-Fe and Nano-Si
作 者：
CHENG Bo;WU Kang;SI Xiong-yuan;WANG Yin;TAN Hua-rong;SI You-bin;School of Resources and Environmental Science, Anhui Agricultural University;Biotechnology Center of Anhui Agricultural University;
关键词：
Nano-Fe0;;Nano-Si0;;Nano-Fe3O4;;Yellow-cinnamon soil;;PCB77;;Degradation
摘 要：
The degradation of3,3′,4,4′-tetrachlorobiphenyl(PCB77) in yellow-cinnamon soil with nano-Fe0, nano-Si0,or nano-Fe3O4 was studied using shaking culture experiments. The results showed that with the dosage of 20 mg kg-1PCB77, the residual content was minimized at 24 h after single addition of 40 mg g-1nano-Fe0. The processes of PCB77 degradation in both sterilized and non-sterilized soils by nano-Fe0 obeyed first-order kinetic laws, with reaction rate constant(Kobs) of 0.0057 and 0.0081 h-1respectively. Meanwhile, the residue rates of PCB77 after 64 h reaction were 68.2% and 53.2% respectively. The degradation efficiency was reduced after sterilization. Binary nano-systems accelerated the degradation of PCB77. The degradation effect was maximized at Si0∶Fe0=1∶10, and after 64 h reaction, the residue rate was only 53%. The degradation effect was also high at Fe3O4∶Fe0=1∶4, and after 64 h reaction, the residue rate was only 42.5%. Except biphenyls, no other degraded products were detected,probably because of the continuous dechlorination of PCB77 on surface of nano-Fe0.
