ZnO rods/reduced graphene oxide composites prepared via a solvothermal reaction for efficient sunlight-driven photocatalysis
ZnO rods/reduced graphene oxide composites prepared via a solvothermal reaction for efficient sunlight-driven photocatalysis
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DOI：
10.1016/j.apcatb.2015.12.007
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发表时间：
2016-05-15
影响因子：
22.1
通讯作者：
Schneider, Raphael
中科院分区：
文献类型：
--
作者：
Moussa, Hatem;Girot, Emilien;Schneider, Raphael
通过在乙醇中进行溶剂热反应，成功地将平均长度约为180 nm、直径约为16 nm的小尺寸氧化锌棒与还原氧化石墨烯（rGO）结合在一起。TEM、SEM、XRD、BET、拉曼光谱和lJV可见吸收等表征结果证实，ZnO/rGO复合材料是由高度分散的ZnO棒结合在rGO纳米片上组成的。研究了ZnO/rGO复合材料在太阳光和可见光照射下的光催化活性。结果表明，含10 wt% rGO的ZnOirGO复合材料在太阳光照下表现出最高的光催化活性，还原动力学为准一级动力学。光催化剂对pH值变化和反应介质中无机盐或葡萄糖的存在仅弱敏感。此外，研究了ZnO/rGO复合材料的可重复使用性，结果表明，光催化剂可以重复使用多达15次，而活性损失几乎可以忽略不计。高的光催化性能可归因于ZnO棒的高比表面，ZnO/rGO复合材料的可见光吸收增强以及ZnO棒与rGO结合产生的电荷载流子重组的强烈减少。(C) 2015 Elsevier B.V.版权所有
Small-sized ZnO rods with an average length of ca. 180 nm and a diameter of ca. 16 nm were successfully associated to reduced graphene oxide (rGO) via a solvothermal reaction conducted in ethanol. A set of characterization including TEM, SEM, XRD, BET, Raman spectroscopy and lJV vis absorption confirm that the ZnO/rGO composite is composed of highly dispersed ZnO rods bound to rGO nanosheets. The photocatalytic activity of the ZnO/rGO composite was investigated under solar light and under visible light irradiation using the Orange II dye in aqueous solution. Results indicate that the ZnOirGO composite containing 10 wt% rGO used under solar light irradiation exhibit the highest photocatalytic activity and that the kinetic of reduction is of pseudo-fist-order. The photocatalyst is only weakly sensitive to pH changes and to the presence of inorganic salts or to glucose in the reaction medium. In addition, the reusability of the ZnO/rGO composite was studied and the results demonstrate that the photocatalyst can be reused up to fifteen times with nearly negligible loss of activity. The high photocatalytic performances can be attributed to the high specific surface of ZnO rods, to the enhanced visible light absorption of the ZnO/rGO composite and to the strong decrease of charge carrier recombinations originating from the association of ZnO rods with rGO. (C) 2015 Elsevier B.V. All rights reserved.