纳米Pd／Fe双金属颗粒对单氯酚及二氯酚的还原脱氯

采用改进液相化学还原法制备纳米Pd／Fe双金属颗粒，研究其钯化率为0．045％和0．135％的条件下分别对3种单氯酚（2-CP、3-CP和4-CP）和3种二氯酚（2，3-DCP、2，4-DCP和2，6-DCP）的脱氯反应。结果表明，合成的纳米Pd／Fe颗粒分散性良好，粒径分布介于25～40nm。纳米Pd／Fe双金属颗粒对单氯酚及二氯酚具有良好的去除效果，3种单氯酚和3种二氯酚的脱氯难易程度分别为2-CP〉4-CP〉3-CP和2，6-DCP〉2，4-DCP〉2，3-DCP，脱氯反应均符合拟一级反应动力学方程。通过还原脱氯实验揭示了分子中氯原子的化学环境对还原脱氯过程具有明显影响。

Degradation of chlorophenols and dichlorophenols by nanoscale Pd/Fe system

Nanoscale Pd/Fe bimetallic panicles were prepared adopting a modified liquid chemical reduc- tire method and the reduetive action of three kinds of chlorinated phenols （2-CP, 3-CP, 4-CP） and dichlorophe- nol（2,3-DCP,2,4-DCP,2,6-DCP） by nanoscale Pd/Fe under Pd weight ratio 0. 045% and 0. 135% was stud- ied. The results showed that particles with small size were dispersed rather evenly and the diameter was between 25 nm and 40 nm. Nanoscale Pd/Fe possessed good removal effect of CPs and DCPs. The dechlorination degree of 3 kinds of CPs with nanoscale Pd/Fe was 2-CP 〉 4-CP 〉 3-CP and the order of 3 kinds of DCPs degradation followed 2,3-DCP 〉 2,4-DCP 〉 2,6-DCP. Furthermore, the degradation of chlorophenols and dichlorophenols followed the pseudo-first-order reaction kinetics. And the results of the experiments indicated that chemical envi- ronment of the chlorine atoms had significant influence on the process of degradating CPs and DCPs.