[ Objective] The research aimed to study reductive dechlorination effect of PCBs in groundwater by Fe/Zn bimetal. [ Method] Fe/ Zn bimetal as reduction system, PCBs degradation ratio as inspected index .degradation effect of PCBs by Fe/Zn bimetallic system when adding self-made hydroxypropyl-β-cyclodextrin (HP-β-CD) was studied. Meanwhile,we investigated the influences of loading ratio and Fe-Zn dosage on the dechlorination of PCBs. [ Result] PCBs was significantly solubilized by the synthesized HP-3-CD. With increase of the HP-β-CD concentration, the apparent solubility of PCBs increased linearly,forming 1:1 inclusion complex. When Fe-Zn dosage was 10 g.and mass fraction of Zn was 7% ,the dechilorination efficiency of PCBs with 321 μg/L was 47,6% after degrading for 7 d at 10 ℃, [Conclusion] The research provided theoretical guiding for in situ remediation of the groundwater contaminated by PCBs.%[目的]研究Fe/Zn双金属对地下水中PCBs的还原脱氯效果.[方法]以Fe、Zn构建二元金属还原体系,以PCBs降解率为考察指标,研究了添加羟丙基-β-环糊精(HP-β-CD)时,Fe/Zn双金属对PCBs的降解效果,同时考察了负载率、金属投加量对PCBs脱氯的影响.[结果]合成的HP-β-CD对PCBs有很好的增溶作用,PCBs表观溶解度随HP-β-CD浓度增加而线性增加,形成1∶1的包结物;10℃下,当混合金属投加量为10 g,Zn质量分数为7％时,321 μg/LPCBs降解7d后的去除率为47.6％.[结论]该研究为PCBs污染的地下水原位修复提供了理论指导.
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