A heterogeneous electro-Fenton-like system with composite cathode Mn<sub>3</sub>O<sub>4</sub>/ACF for efficient degradation of methylene blue in wide pH range

HE Yingying; MENG Jian; MA Yali; ZHANG Xiaoyu

doi:10.11949/j.issn.0438-1157.20160775

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A heterogeneous electro-Fenton-like system with composite cathode Mn₃O₄/ACF for efficient degradation of methylene blue in wide pH range

更新时间：2025-11-26

- A heterogeneous electro-Fenton-like system with composite cathode Mn₃O₄/ACF for efficient degradation of methylene blue in wide pH range
- CIESC Journal Issue 1, Pages: 305-312(2017)
- 作者机构：
  
  西安建筑科技大学理学院,陕西,西安,710055
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20160775
  CLC： 614.3X703.1
- Online First：05 January 2017，
  
  Published：05 January 2017
- 稿件说明：
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HE Yingying, MENG Jian, MA Yali, et al. A heterogeneous electro-Fenton-like system with composite cathode Mn₃O₄/ACF for efficient degradation of methylene blue in wide pH range[J]. CIESC Journal, 2017, (1): 305-312. DOI: 10.11949/j.issn.0438-1157.20160775.
DOI：

HE Yingying, MENG Jian, MA Yali, et al. A heterogeneous electro-Fenton-like system with composite cathode Mn₃O₄/ACF for efficient degradation of methylene blue in wide pH range[J]. CIESC Journal, 2017, (1): 305-312. DOI: 10.11949/j.issn.0438-1157.20160775. DOI：

摘要

用电化学方法将Mn3O4负载于活性炭纤维（activated carbon fiber，ACF）表面制备了Mn3O4/ACF复合阴极，与铂丝阳极构成了异相类电芬顿体系对模型污染物亚甲基蓝（MB）进行降解，考察了该体系在不同pH条件下对MB去除率，并对体系中的活性氧物种进行了检测，初步探讨了降解机理。实验结果表明，在pH 3.0、pH 5.0和pH 7.0时亚甲基蓝脱色率分别达到97.3%、99.9%、99.8%，pH5.0时TOC去除率达到88.6%，pH 7.0和pH 3.0时也分别达到了80.4%和73.4%，拓宽了电芬顿反应的适宜pH范围。体系中活性氧物种的检测结果表明，氧在阴极电还原产生H2O2，并与Mn3O4反应生成羟基自由基·OH，同时，氧的一电子还原产物超氧自由基O2·-也对阴极表面污染物的脱色有重要贡献。

Abstract

A composite activated carbon fiber(ACF) cathode Mn3O4/ACF

which was prepared using a cyclic voltammetry method

was employed in a heterogeneous electro-Fenton-like system for the degradation of a model dye

methylene blue(MB)

with no other reagents added.The decolorization ratio and the mineralization of MB in the different pH were investigated and the active oxygen species involved in the system were also detected.The experiment results showed that when solution pH was set as 3.0

5.0 and 7.0

the decolorization ratio reached to 97.3%

99.9% and 99.8%

respectively

and TOC removal achieved to 73.4%

88.6% and 80.4%

indicating the extensive feasibility of the system in broad pH range.The results of detection of the active oxygen species demonstrated that H2O2 was electro-produced at the surface of cathode.The hydroxyl free radical·OH generated by the Fenton-like reaction of Mn3O4 with H2O2 was responsible to the degradation of MB.The superoxide radical O2·- was also proved playing important role in decolorization of MB.The mechanism of degradation of the contaminant by this heterogeneous electro-Fenton-like system was preliminarily discussed.

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A heterogeneous electro-Fenton-like system with composite cathode Mn3O4/ACF for efficient degradation of methylene blue in wide pH range

DOI：10.11949/j.issn.0438-1157.20160775

摘要

Abstract

关键词

Keywords

references

A heterogeneous electro-Fenton-like system with composite cathode Mn₃O₄/ACF for efficient degradation of methylene blue in wide pH range