On the Fenton degradation mechanism.: The role of oxalic acid

被引：14

作者：

Alegría, Y

Liendo, F

Núñez, O

机构：

[1] Univ Simon Bolivar, Dept Proc & Sistemas, Lab Quim Ambiental, Apartado Postal 89000, Caracas, Venezuela

[2] PDVSA Intevep, Gerencia Ecol & Ambiente, Caracas 1070A, Venezuela

来源：

ARKIVOC | 2003年

关键词：

Fenton; p-nitrophenol; pseudo first-order; Fe(III)-oxalic acid-complex;

D O I：

10.3998/ark.5550190.0004.a49

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

Kinetics of Fenton (Fe(II) + H2O2) p-nitrophenol degradation reveal that the measured pseudo first-order rate constant is given by the expression: kobs = kK [H2O2]/ (1 + K[H2O2]), where K= 20.3 x 10(2) M-1 is the equilibrium constant of formation of the complex Fe(II)-(H2O2)(n) and k= 1.5 x 10(-2) s(-1) is the first order rate constant of degradation of the complex to yield Fe (III), OH and OH-. When oxalic acid is added, the complex Fe(III)-oxalic acid-H2O2 is formed producing a highly oxidized Fe(IV) species as the primary oxidant agent.

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收藏

页码：538 / 549

页数：12

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