Trichloroacetic acid dehalogenation by reductive radicals

被引：28

作者：

Gara, Pedro David

Bucharsky, Ethel

Woerner, Michael

Braun, Andre M.

Martire, Daniel O.

Gonzalez, Monica C. ^{[1
]}

机构：

[1] Univ Nacl La Plata, Fac Ciencias Exactas, INIFTA, La Plata, Argentina

[2] Univ Karlsruhe, Lehrstuhl Umweltmesstech, D-76128 Karlsruhe, Germany

来源：

INORGANICA CHIMICA ACTA | 2007年 / 360卷 / 03期

关键词：

tricbloroacetic acid; carbon dioxide radical anion; hydroxymethyl radical; reductive dehalogenation; superoxide radical anion;

D O I：

10.1016/j.ica.2006.10.019

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Advanced oxidation processes, using either UVC/H2O2 or UVC/K2S2O8, both in the presence of H2CO2 or CH3OH are very efficient in mineralizing aqueous solutions of trichloroacetic acid (TCAA) leaving no toxic residues. The main reaction initiating TCAA depletion is its reduction by the radicals CO2.- or (CH2OH)-C-. to yield (CCl2CO2-)-C-. radicals and Cl- anions. Further thermal reactions of (CCl2CO2-)-C-. lead to the formation of CO2 and HCL Molecular oxygen competes with TCAA for CO2.- and (CH2OH)-C-. radicals. However, in experiments under continuous irradiation of initially air-saturated solutions in closed reactors, the dissolved molecular oxygen concentration was depleted to low enough levels to favor the reaction of the reducing radicals with TCAA. A general reaction mechanism is proposed and discussed. The reaction between superoxide radical anions and TCAA was found to be of low efficiency. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：1209 / 1216

页数：8

共 23 条

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