化学
离解(化学)
吸附
激进的
光化学
污染物
罗丹明B
催化作用
硫酸盐
降级(电信)
浸出(土壤学)
羟基自由基
化学工程
光催化
有机化学
工程类
土壤科学
土壤水分
电信
计算机科学
环境科学
作者
Ai-Yong Zhang,Yuan-Yi He,You‐Peng Chen,Jingwei Feng,Nai-Hui Huang,Fei Lian
标识
DOI:10.1016/j.cej.2017.11.078
摘要
Co3O4-mediated heterogeneous activation of peroxymonosulfate (PMS) is an efficient strategy to generate sulfate radicals for environmental pollutants degradation. The rate-limiting step is CoOH− complex formation, and it highly depends on the thermodynamic capacity of water dissociation to generate surface hydroxyl groups. Herein, for efficient PMS activation and pollutants degradation, the water dissociation capacity of TiO2, a promising Co3O4 support, was facilely refined by its shape-tailored synthesis with dominant high-energy {0 0 1} facet. The polar {0 0 1} facet is characterized by a high density of atomic steps, edges and kinks of the low-coordinate surface atoms with a large number of dangling bonds, all of which can serve as reactive sites for water adsorption and dissociation and thus improve CoOH− complex formation dynamics in sulfate radical formation. Co3O4 deposited on TiO2-{0 0 1} exhibited a much higher PMS activation capacity and pollutants degradation efficiency, i.e. p-nitrophenol and rhodamine B, and a much lower Co2+ leaching. This superiority could be mainly attributed to the strong Ti5c-centered water adsorption and dissociation, the high density of surface hydroxyl groups, the robust CoOH− complex generation and the intimate catalyst-support interactions. Our findings might provide a new chance to refine Co-mediated sulfate radical generation and other Fenton-like systems for advanced water treatment with reduced secondary pollution.
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