纳米Fe^0降解溶液中3,3′,4,4′-四氯联苯及其产物分析

Degradation of 3,3′,4,4′-tetrachlorobiphenyl in Solution by Nano-Fe^0 and its Product Analysis

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。

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.