Photocatalytic Degradation of Polychlorinated biphenyls using TiOィイD22ィエD2.

多氯联苯（多氯联苯）是209种离散化学品，称为同系物的一类，在其中，十氯联苯原子被替代为联苯。它们的化学和物理稳定性及其电子绝缘特性被用于PCBs的商业用途。Their stability have also been responsible for the PCB environmental contamination problem。We conducted the photocatalytic degradations of polychlorinated biphenyls in a plate-type batch recycle photoreactor using TiO D22-D2 thin film were experimentally examined in acetonitrile/H-D2O system。高氯联苯、六氯联苯、七氯联苯和八氯联苯的集中，简化了这个系统中的辐射时间，但低氯联苯、四氯联苯和五氯联苯的集中，增加了一小时后缓慢地减少了。有人提出了一些从高氯联苯中产生的序列反应，以使较低的物质是不透明的和附加的多氯联苯在这个系统中产生/分解的。此外，四氯联苯通过八氯联苯的总降解率大约为35%，在提供氧气天然气的辐射后12小时内，对多氯联苯-对二氧（PCDDs）和二苯并呋喃（PCDFs）的光降解率在本系统中进行了实验测试。高氯含量H7 CDDs和P5 CDDs的集中程度与辐照时间减少，但低二恶英、P5 CDDs和T4 CDDs的简化程度较低。PCDDs和PCDFs被光化79%，其降解率为76%，24小时后，在此光子反应器被400 W高压汞灯辐射。

Polychlorinated biphenyls (PCBs) are a class of 209 discrete chemicals, called congeners, in which one to ten chlorine atoms are substituted to biphenyl. Their chemical and physical stability and their electrical insulating properties led to the commercial utility of PCBs. Their stability have also been responsible for the PCB environmental contamination problem.We conducted the photocatalytic degradations of polychlorinated biphenyls in a plate-type batch recycle photoreactor using TiOィイD22ィエD2 thin film were experimentally examined in acetonitrile/HィイD22ィエD2O system. The concentrations of higher chlorinated biphenyls, hexa-, hepta- and octa-CBs, decreased simply with irradiation time in this system, but that of lower chlorinated biphenyls, tetra- and pent-CBs, increased for one hour and then decreased slowly. It was suggested that some serial reactions from higher chlorinated biphenyls to lower substances were occurred and additional PCBs were created/decomposed in this system. In addition, the dechlorination rate of total PCBs of tetra- through octa-CBs was approximately 35% after 12 hours of irradiation in providing the oxygen gas.Photoatalytic degradations of polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzo furans (PCDFs) are experimentally examined in this system. The concentration of higher chlorinated H7CDDs and P5CDDs decreased simply with irradiation time, but those of lower dioxins, P5CDDs and T4CDDs, decreased slowly. PCDDs and PCDFs photolyzed 79% and the dechlorination rate of them were 76% after 24 hours in this photoreactor irradiated by 400W high-pressure mercury lamp.