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

使用 TiO2D22 光催化降解多氯联苯。

基本信息

批准号：
09650852
负责人：
FUNAYAMA Hitoshi
金额：
$ 2.11万
依托单位：
Akita National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650852/
关键词：
Photoreactor Photocatalytic reaction Polychlorinated Biphenyles Photodegradation Titanium-dioxide Photo-oxidation Dioxins

项目摘要

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.

多氯联苯（PCBs）是一类有209种不同的化学物质，称为同系物，其中1到10个氯原子被取代为联苯。它们的化学和物理稳定性以及它们的电绝缘性能导致了pcb的商业用途。它们的稳定性也导致了PCB的环境污染问题。我们进行了光催化退化多氯联苯的平板型批量回收photoreactor使用TiOィイD22摊位ィエD2薄膜实验检查在乙腈/ HィイD22摊位ィエD2O系统。高氯联苯（六、七、八）的浓度随辐照时间的延长而下降，低氯联苯（四、五）的浓度随辐照时间的延长而升高，但随后缓慢下降。结果表明，高氯联苯与低氯联苯发生了一系列反应，并在该体系中产生/分解了更多的多氯联苯。此外，在提供氧气照射12小时后，四到八氯联苯的总多氯联苯脱氯率约为35%。实验研究了该系统对多氯二苯并对二恶英（pcdd）和二苯并呋喃（pcdf）的光催化降解。高氯代二恶英、p5cdd的浓度随辐照时间的延长而下降，低氯代二恶英、p5cdd和t4cdd的浓度下降缓慢。在400W高压汞灯照射的光反应器中，pcdd和PCDFs在24h后的光解率为79%，脱氯率为76%。