Korte N E, West O R, Liang L, Gu B, Zutman J L, Fernando Q
Oak Ridge National Laboratory, TN 37831, USA.
Waste Manag. 2002;22(3):343-9. doi: 10.1016/s0956-053x(01)00050-2.
This report describes the application of palladized iron (Pd/Fe) to the dechlorination of polychlorinted biphenyls (PCBs) at ambient temperature. Experiments supported by congener-specific analyses demonstrated that dechlorination occurs in a step-wise fashion with the meta-chlorines being more reactive than ortho-chlorines. Over the course of the laboratory experiments, complete conversion to biphenyl was observed. The process was also tested with PCBs dissolved in high (40-60%) concentrations of ethanol and isopropanol as a means of simulating solutions generated by commercial soil and solid waste extraction processes. The reaction rate was sensitive to the percentage of solvent but complete dechlorination was still indicated. Tests with soil extracts from a contaminated site demonstrated that there were no apparent interferences from asphalt and other miscellaneous debris. Short-duration tests with highly contaminated PCB solutions from a hazardous waste site demonstrated efficient dechlorination although there was a reduction in reaction rate with time.
本报告描述了在常温下用钯铁（Pd/Fe）对多氯联苯（PCBs）进行脱氯处理。通过同族体特异性分析支持的实验表明，脱氯以逐步方式发生，间位氯比邻位氯更具反应活性。在实验室实验过程中，观察到完全转化为联苯。该过程还以溶解在高浓度（40 - 60%）乙醇和异丙醇中的多氯联苯进行测试，以此模拟商业土壤和固体废物提取过程产生的溶液。反应速率对溶剂百分比敏感，但仍表明能完全脱氯。对受污染场地土壤提取物的测试表明，沥青和其他杂物没有明显干扰。对来自危险废物场地高污染多氯联苯溶液的短期测试表明，尽管反应速率随时间降低，但脱氯效果良好。
