One-pot synthesis of ZnO/ZnGa2O4 heterojunction with X/XY structure for improved photocatalytic activity
One-pot synthesis of ZnO/ZnGa2O4 heterojunction with X/XY structure for improved photocatalytic activity
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一锅法合成具有X/XY结构的ZnO/ZnGa2O4异质结以提高光催化活性
DOI：
10.1016/j.apsusc.2014.08.089
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发表时间：
2014-10-30
影响因子：
6.7
通讯作者：
Liu Wanyi
中科院分区：
文献类型：
--
作者：
Ma Baojun;Lin Keying;Liu Wanyi
采用一锅共沉淀法制备了ZnO/ZnGa 2 O 4异质结光催化剂。XRD和拉曼光谱表明，生成了ZnO和ZnGa 2 O 4。SEM照片显示ZnO/ZnGa 2 O 4异质结复合材料的颗粒尺寸约为20 nm。HRTEM图像显示ZnO和ZnGa 2 O 4之间的紧密接触。通过光催化降解水溶液中的甲基橙子（MO）来评价光催化剂的活性。最佳光催化剂ZnO/ZnGa 2 O 4 - 0. 2在70 min内对MO的降解率达到82%，大大高于ZnO和ZnGa 2 O 4的6%和47%。ZnO和ZnGa 2 O 4之间的异质结促进了电荷分离，从而提高了光催化活性。ZnO/ZnGa 2 O 4异质结的制备方法具有潜在的商业价值，可应用于其它类似X/XY结构的半导体异质结。(C)2014爱思唯尔有限公司版权所有。
A large scale one-pot coprecipitation method is developed for synthesis of ZnO/ZnGa2O4 heterojunction photocatalysts. XRD and Raman spectra show that ZnO and ZnGa2O4 are formed. SEM images indicate the particle size of ZnO/ZnGa2O4 heterojunction composites is about 20 nm. The HRTEM images show a close contact between ZnO and ZnGa2O4. The activities of photocatalysts are evaluated by photocatalytic degradation of methyl orange (MO) in the aqueous solution. The efficiency of MO degradation on the optimum photocatalysts ZnO/ZnGa2O4-0.2 shows about 82% in 70 min, which is greatly higher than that of ZnO ( 6%) and ZnGa2O4 (47%). It is proposed that the heterojunctions between ZnO and ZnGa2O4 promote the charge separation and is responsible for the improved photocatalytic activity. The synthetic method of ZnO/ZnGa2O4 heterojunction has potential commercial value and can be applied to other semiconductors heterojunctions with similar structure of X/XY. (C) 2014 Elsevier B.V. All rights reserved.