HETEROGENEOUS PHOTOLYSIS OF POLYCHLORINATED DIBENZO-P-DIOXINS ON FLY-ASH IN WATER-ACETONITRILE SOLUTION IN RELATION TO THE REACTION WITH OZONE

被引：12

作者：

MUTO, H ^{[1
]}

SHINADA, M ^{[1
]}

TAKIZAWA, Y ^{[1
]}

机构：

[1] AKITA UNIV, SCH MED, DEPT PUBL HLTH, AKITA 010, JAPAN

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 1991年 / 25卷 / 02期

关键词：

D O I：

10.1021/es00014a016

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The destruction of polychlorinated dibenzo-p-dioxins (PCDDs) on fly ash particles from municipal solid waste in water or water-acetonitrile (2:3, v/v) solution was conducted by heterogeneous photolysis (254 nm) with or without the presence of ozone. The photolytic reactions of 2,3,7,8-chlorine-substituted DDs of tetra- through octa-CDDs were faster than those of other isomers in several photosystems. The presence of ozone facilitated PCDD photolyses as well as the "PCDD risk rate" on fly ash. Fly ash particles themselves, which include PCDDs and metal oxides, play a role in the photodriven process for PCDD destruction in the heterogeneous photosystems. The toxic equivalent calculation is necessary to assess the effect of PCDDs on human health and to develop an advanced technique for PCDD reduction.

引用

页码：316 / 322

页数：7

共 41 条

[1] SUNLIGHT PHOTODEGRADATION OF 2,4,5-TRICHLOROPHENOXY-ACETIC ACID AND 2,4,5,TRICHLOROPHENOL ON TIO2 - IDENTIFICATION OF INTERMEDIATES AND DEGRADATION PATHWAY [J].