Fenton degradation of malachite green catalyzed by aromatic additives
Fenton degradation of malachite green catalyzed by aromatic additives
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芳香添加剂催化芬顿降解孔雀石绿
DOI：
10.1021/jp0144350
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发表时间：
2002-10-17
影响因子：
2.9
通讯作者：
Zhao, JC
中科院分区：
文献类型：
--
作者：
Chen, F;Ma, WH;Zhao, JC
研究了不同芳香族添加剂对孔雀石绿色（MG）的芬顿降解作用.结果发现，芳香族添加剂表现出催化立即或诱导期后，加速MG降解的芬顿反应。采用EPR、GC-MS和氧化还原电位测量来获得反应过程的细节。提出了芬顿试剂（Fe 2 +/Fe 3+，H2 O2）与芳香族化合物相互作用的反应机理，涉及芬顿反应中类对苯二酚中间体的生成和氧化还原循环。添加各种芳香族添加剂后MG的芬顿反应速率分别为。按照以下顺序：对苯二酚>水杨酸>对羟基苯甲酸>间羟基苯甲酸>对苯醌>羧基芳族化合物>酰胺基芳族化合物，这也与它们转化成类对苯二酚化合物的能力相当一致。对苯二酚类化合物可以与三价铁离子反应再生亚铁离子，并通过与HO 2反应从醌或半醌中连续再生。这加速了芬顿反应。
Fenton degradation of malachite green (MG) catalyzed by various kinds of aromatic additives was examined. It was found that the aromatic additives exhibited catalysis immediately or after an induction period to accelerate the MG degradation in the Fenton reaction. EPR, GC-MS, and redox potential measurements were employed to obtain details of the reaction process. A reaction mechanism is proposed for the interaction between Fenton reagents (Fe2+/Fe3+, H2O2) and the aromatic compounds, which involves the generation and redox cycle of hydroquinone-like intermediates in the Fenton reaction. The Fenton reaction rates of MG after addition of various kinds of aromatic additives were. in the following order: hydroquinone > salicylic acid > p-hydroxylbenzoic acid > m-hydroxylbenzoic acid > p-benzoquinone > carboxylic aromatics > amido aromatics, which is also quite consistent with their ability to be transformed into hydroquinone-like compounds. Hydroquinone-like compounds can react with ferric ions to regenerate ferrous ions and are regenerated continuously from quinone or semiquinone by reacting with HO2. which accelerates the Fenton reaction.