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Chemical instability of graphene oxide following exposure to highly reactive radicals in advanced oxidation processes

文献类型： 外文期刊

作者： Wang, Zhaohui 1 ; Sun, Linyan 1 ; Lou, Xiaoyi 3 ; Yang, Fei 1 ; Feng, Min 1 ; Liu, Jianshe 1 ;

作者机构： 1.Donghua Univ, Coll Environm Sci & Engn, State Environm Protect Engn Ctr Pollut Treatment, Shanghai 201620, Peoples R China

2.Univ Newcastle, ICBLU, Callaghan, NSW 2308, Australia

3.Chinese Acad Fishery Sci, East China Sea Fisheries Res Inst, Shanghai 200090, Peoples R China

关键词： Graphene oxide;Sulfate radical;Hydroxyl radical;Decomposition;Advanced oxidation processes

期刊名称：JOURNAL OF COLLOID AND INTERFACE SCIENCE （ 影响因子：8.128； 五年影响因子：7.211 ）

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收录情况： SCI

摘要： The rapidly increasing and widespread use of graphene oxide (GO) as catalyst supports, requires further understanding of its chemical stability in advanced oxidation processes (AOPs). In this study, UV/H2O2 and UV/persulfate (UV/PS) processes were selected to test the chemical instability of GO in terms of their performance in producing highly reactive hydroxyl radicals ((OH)-O-center dot) and sulfate radicals (SO4 center dot-), respectively. The degradation intermediates were characterized using UVvisible absorption spectra (UVvis), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), Raman spectroscopy, and matrix-assisted laser desorption and ionization time-of-flight mass spectrometry (MALDI-TOF-MS). Experimental data indicate that UV/PS process was more effective in enhancing GO degradation than the UV/H2O2 system. The overall oxygen-containing functionalities (e.g. C-O, C=O and O-C=O groups) dramatically declined. After radical attack, sheet-like GO was destructed into lots of flakes and some low-molecular-weight molecules were detected. The results suggest GO is most vulnerable against SO4 center dot- radical attack, which deserves special attention while GO acts as a catalyst support or even as a catalyst itself. Therefore, stability of GO and its derivatives should be carefully assessed before they are applied to SO4 center dot- based AOPs. (C) 2017 Elsevier Inc. All rights reserved.

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