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题名: Effect of phosphate on heterogeneous Fenton oxidation of catechol by nano-Fe3O4: Inhibitor or stabilizer?
作者: Yang, Xiaofang; He, Jie; Sun, Zhongxi; Holmgren, Allan; Wang, Dongsheng
刊名: JOURNAL OF ENVIRONMENTAL SCIENCES
出版日期: 2016-01
卷号: 39, 期号:0, 页码:69-76
关键词: Heterogeneous Fenton oxidation ; Adsorption ; ATR-FTIR ; Interface mechanism
DOI: 10.1016/j.jes.2015.11.007
部门归属: 环境水质学国家重点实验室
英文摘要: The effect of phosphate on adsorption and oxidation of catechol, 1,2-dihydroxybenzene, in a heterogeneous Fenton system was investigated. In situ attenuated total reflectance infrared spectroscopy (ATR-FTIR) was used to monitor the surface speciation at the nano-Fe3O4 catalyst surface. The presence of phosphate decreased the removal rate of catechol and the abatement of dissolved organic compounds, as well as the decomposition of H2O2. This effect of phosphate was mainly due to its strong reaction with surface sites on the iron oxide catalyst. At neutral and acid pH, phosphate could displace the adsorbed catechol from the surface of catalyst and also could compete for surface sites with H2O2. In situ IR spectra indicated the formation of iron phosphate precipitation at the catalyst surface. The iron phosphate surface species may affect the amount of iron atoms taking part in the catalytic decomposition of H2O2 and formation of hydroxyl radicals, and inhibit the catalytic ability of Fe3O4 catalyst. Therefore, phosphate ions worked as stabilizer and inhibitor in a heterogeneous Fenton reaction at the same time, in effect leading to an increase in oxidation efficiency in this study. However, before use of phosphate as pH buffer or H2O2 stabilizer in a heterogeneous Fenton system, the possible inhibitory effect of phosphate on the actual removal of organic pollutants should be fully considered. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/36034
Appears in Collections:环境水质学国家重点实验室_期刊论文

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Recommended Citation:
Yang, Xiaofang,He, Jie,Sun, Zhongxi,et al. Effect of phosphate on heterogeneous Fenton oxidation of catechol by nano-Fe3O4: Inhibitor or stabilizer?[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2016,39(0):69-76.
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