[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 selfmade hydroxypropyl-β-cyclodextrin ( HP-β-CD) was studied. Meanwhile,we investigated the influences of loading ratio and Fe-Zn dosage on PCBs dechlorination. [Result]PCBs was significantly solubilized by the synthesized HP-β-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 dechlori-nation efficiency of 321 μg /L PCBs 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.
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