Efficient decolorization of Malachite Green in the Fenton reaction catalyzed by [Fe(III)-salen]Cl complex
Efficient decolorization of Malachite Green in the Fenton reaction catalyzed by [Fe(III)-salen]Cl complex
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DOI：
10.1016/j.cej.2012.09.124
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发表时间：
2013-01-15
影响因子：
15.1
通讯作者：
Zhou Yanshui
中科院分区：
文献类型：
--
作者：
Bai Cuiping;Xiao Wensheng;Zhou Yanshui
研究了[Fe（III）-salen]Cl络合物对芬顿体系中孔雀石绿色脱色降解的催化作用。一个显着的脱色增强观察到在只有微量的络合物的存在下，没有额外的设备或外部能源。研究了反应参数对脱色率的影响，结果表明：[Fe（III）-saler]Cl络合物的量、salen配体与Fe（III）的摩尔比和H2 O2的初始浓度的增加有利于脱色率的提高。染料初始浓度的增加导致脱色率降低，最佳pH为孔雀石绿绿色溶液的初始pH。在最佳条件下，处理24 min，脱色率和TOC去除率分别为97.94%和54.35%。羟基自由基是[Fe（III）-salen]Cl络合物催化芬顿体系的主要活性氧化剂。分析了孔雀石绿色的降解中间产物，提出了可能的反应机理。孔雀石绿绿色的脱色符合准一级动力学方程，由相关动力学常数计算出的活化能仅为Fe（III）芬顿体系的49.13%.皇冠版权所有（C）2012由Elsevier B. V.出版。保留所有权利。
The catalysis effect of [Fe(III)-salen]Cl complex on the decolorization and degradation of Malachite Green in the Fenton system was investigated in this study. A significant decolorization enhancement was observed in the presence of only trace amount of the complex without additional equipment or external energy. The effects of reaction parameters were studied and the results showed that the increase of [Fe(III)-saler]Cl complex, molar ratio of salen ligand to Fe(III) and initial concentration of H2O2 favor the increase of decolorization rate. The increase of initial concentration of the dye leads to the decrease of decolorization rate and the optimum pH was the original pH of Malachite Green solution. Under the optimal condition, the decolorization and TOC removal rates after 24 min treatment were 97.94% and 54.35% respectively. Hydroxyl radical was identified as the main active oxidant species in the [Fe(III)-salen]Cl complex catalyzed Fenton system. The degradation intermediates of Malachite Green were analyzed and a possible reaction mechanism was proposed. The decolorization of Malachite Green obeyed the pseudo-first order equation and the activation energy was calculated by the related kinetic constants, which was only 49.13% of Fe(III) Fenton system. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.