Microwave-enhanced decomposition of polychlorinated biphenyl in simulative capacitor oil with the presence of NaOH, hydrogen donor and catalyst
The obsolete polychlorobiphenyls (PCBs)-containing capacitors could cause serious hazard to environment and human health. Microwave irradiation was adopted to decompose 2,2,5,6-tetrachlorobiphenyl (PCB53) dissolved in cetane (to simulate capacitor oil) in alkaline environment, where cetane acted as both reaction medium and hydrogen donor. The effect of another hydrogen donor, sodium hypophosphite (NaH2PO2), was also investigated. Granular activated carbon (GAC) or copper/iron-loaded GAC was added as microwave absorbing material to raise the reaction temperature, and on the other hand as catalyst to promote the dechlorination process. The results indicated that PCB53 in cetane could be decomposed efficiently by microwave irradiation with the presence of NaOH, hydrogen donor, and catalyst. NaH2PO2 was shown to be a more effective hydrogen donor than cetane. The copper-loaded or iron-loaded GAC had better catalysis effect than fresh GAC, while these two catalysts had similar effects. Microwave output power was very important, and the treatment under the condition of a higher microwave power for a short time was more effective than that of a lower microwave power for a long time. Higher degradation efficiencies were obtained when NaOH was added in aqueous solution instead of as particles.
PCBs catalyst hydrogen donor dechlorination
Xitao Liu Wei Zhao
State Key Laboratory of Water Environment Simulation,School of Environment,Beijing Normal University Center for Resource Sharing Promotion,Institute of Scientific and Technical Information of China Bei
国际会议
北京
英文
1-4
2009-06-11（万方平台首次上网日期，不代表论文的发表时间）