Photoassisted dehalogenation of organo-chlorine compounds by paratungstate A in aqueous solutions

被引：69

作者：

Hu, CW ^{[1
]}

Yue, B ^{[1
]}

Yamase, T ^{[1
]}

机构：

[1] Tokyo Inst Technol, Res Lab Resources Utilizat, Midori Ku, Yokohama, Kanagawa 2268503, Japan

来源：

APPLIED CATALYSIS A-GENERAL | 2000年 / 194卷

关键词：

paratungstate A anion; photodegradation; ogano-chlorine compounds; UV-induced dechlorination; photocatalyst;

D O I：

10.1016/S0926-860X(99)00358-0

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Nearly neutral aqueous solutions of 22 organo-chlorine compounds undergo photodegradation (lambda > 250 nm) catalyzed by paratungstate A,anion, [W7O24](6-), which was obtained by adjusting pH levels of the Na2WO4 solution to 6-7. In each case the organic:substrate was decomposed through dehalogenation. The rate of Cl- formation strongly depends on substrates. The photochemical redox reaction between paratungstate A and substrates proceeds:via precomplexation. The Langmuir-type dependence of the reaction rates on the concentration of substrates:provides a promising method for the dechlorination of alkyl- and aromatic-chloride compounds such as ClCH2CH2CH2Cl, C3H7Cl : and C6H5CH2Cl. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：99 / 107

页数：9

共 42 条

[1] GROUNDWATER CONTAMINATION [J].

ABELSON, PH .

SCIENCE, 1984, 224 (4650) :673-673

[2]

BINRAN K, 1993, JAPAN CHEM SOC, V2, P302

[3] Photocatalysis of H3PW12O40 for 4-chlorophenol decomposition in aqueous media [J].

Einaga, H ;

Misono, M .

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 1996, 69 (12) :3435-3441

[4] Catalysis by heteropoly compounds .33. Photocatalyzed decomposition of 4-chlorophenol by Keggin-type heteropolytungstate [J].

Einaga, H ;

Misono, M .

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 1997, 70 (07) :1551-1557

[5]

GETOFF N, 1991, RADIAT PHYS CHEM, V37, P673

[6]

HARTL H, 1993, ANGEW CHEM, V105, P1545

[7] A W-183, H-1 AND O-17 NUCLEAR-MAGNETIC-RESONANCE STUDY OF AQUEOUS ISOPOLYTUNGSTATES [J].

HASTINGS, JJ ;

HOWARTH, OW .

JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS, 1992, (02) :209-215

[8]

HELZ GR, 1984, ENVIRON SCI TECHNOL, V18, pA48, DOI 10.1021/es00120a717

[9] CATALYTIC PHOTOCHEMICAL DEHYDROGENATION OF ORGANIC SUBSTRATES BY POLYOXOMETALATES [J].

HILL, CL ;

BOUCHARD, DA .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1985, 107 (18) :5148-5157

[10] Catalysis by heteropoly acids and multicomponent polyoxometalates in liquid-phase reactions [J].

Kozhevnikov, IV .

CHEMICAL REVIEWS, 1998, 98 (01) :171-198

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