Decontamination of Cr(VI) by graphene oxide@TiO2 in an aerobic atmosphere: effects of pH, ferric ions, inorganic anions, and formate

文献类型： 外文期刊

第一作者： Hu, Xinjiang

作者： Hu, Xinjiang;Zhao, Yunlin;Hu, Xi;Tang, Chunfang;Hu, Xinjiang;Zhao, Yunlin;Wang, Hui;Yang, Yuanxiu;Cai, Xiaoxi;Liu, Yunguo;Liu, Yunguo

作者机构：

关键词： hexavalent chromium; graphene oxide@tio(2); ferric ions; inorganic anions; formate

期刊名称：JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY （ 影响因子：3.174； 五年影响因子：3.137 ）

ISSN： 0268-2575

年卷期： 2018 年 93 卷 8 期

页码：

收录情况： SCI

摘要： BACKGROUNDIn this study, a graphene oxide@TiO2 composite (GO/TiO2) was prepared and characterized by SEM, EDX, XRD, nitrogen adsorption-desorption isotherm, and XPS. Photocatalytic reduction and removal of Cr(VI) using this composite in an aerobic atmosphere were studied under UV irradiation. The effects of pH, ferric ions, inorganic anions, and formate were investigated systematically. RESULTSThe Cr(VI) reduction rate decreased with increasing solution pH. The presence of ferric ions in the system improved the photocatalytic reduction process. The effects of SO42- and PO43- on the process were higher than those of Cl- and NO3-. Formate slightly inhibited adsorption of Cr(VI), while it improved Cr(VI) reduction. GO/TiO2 has good stability and it maintained full photoreduction activity for at least three cycles. CONCLUSIONThe results indicated that GO/TiO2 can thermodynamically reduce Cr(VI) to Cr(III) under UV light. Environmental conditions and wastewater characteristics (e.g. pH, ferric ions, inorganic anions, and formate) can influence the decontamination process because they affect the interactions between chromium ions and GO/TiO2 and alter the electron-transfer pathways. The results suggest that the GO/TiO2 is an attractive material for removing hexavalent chromium from water using a photocatalytic process. (c) 2018 Society of Chemical Industry

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