纳米Fe0降解溶液中3，3′，4，4′-四氯联苯及其产物分析

摘要

The degradation of 3,3′,4,4′-tetrachlorobiphenyl (PCB77) in yellow-cinnamon soil by nano-Fe0 was studied using shaking culture experiments. Initial concentration PCB77 for 5mg/L,solution for 6.8,ini-tial pH value,nanometer reaction after 64h Fe0 dosage for 10.0g/L,PCB77 residue concentration,remain low-est rate is only 29.3%.Nano Si0 dosage for 0.5g/L,PCB77 residue concentration and retention rate lowest,on-ly for 67%. Nano Si0 dosage of 1.0g/L,namely the nano Si0/nano Fe0 was 1/10,PCB77 residue concentration and retention rate lowest,only to 22.2%. Except biphenyls,no other degraded products were detected,proba-bly because of the continuous dechlorination of PCB77 on surface of nano-Fe0.%采用振荡培养实验研究了纳米Fe0对溶液中3，3′，4，4′-四氯联苯（PCB77）的降解情况，结果表明， PCB77起始浓度为5mg/L、溶液初始pH值为6.8，反应64 h后，纳米Fe0投加量为10.0g/L时，PCB77残留浓度最低，残留率仅为29.3%；纳米Si0投加量为0.5g/L时，PCB77残留浓度最低，残留率为67%；纳米Si0投加量为1.0g/L，即纳米Si0：纳米Fe0=1∶10时，PCB77残留浓度最低，残留率仅为22.2%。溶液中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。