Enhancement photocatalytic activity of the graphite-like C3N4 coated hollow pencil-like ZnO
Enhancement photocatalytic activity of the graphite-like C3N4 coated hollow pencil-like ZnO
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类石墨C3N4涂覆空心铅笔状ZnO增强光催化活性
DOI：
10.1016/j.jcis.2015.03.038
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发表时间：
2015-07-15
影响因子：
9.9
通讯作者：
Zhang, Haiqian
中科院分区：
文献类型：
--
作者：
Lv, Hualiang;Ji, Guangbin;Zhang, Haiqian
用化学沉积法制备了长9-12 μ m、宽350-700 nm、壁厚200 nm的ZnO空心管，表面涂有g-C_3 N_4。与未包覆的ZnO或g-C3 N4相比，这些g-C3 N4/ZnO复合材料表现出更高的光催化活性，这归因于异质结结构。此外，值得指出的是，g-C3 N4与ZnO的重量比（g-C3 N4/ZnO）对光降解性能起到显著影响。随着质量比的增加，光催化活性先增加，达到最佳光催化性能后又下降。可以推断，g-C3 N4在ZnO表面上的增值可以改善接触面积，从而导致高的电子和空穴分离。但过量的g-C3 N4会阻碍电子从g-C3 N4向ZnO的转移，从而降低其光催化性能。当g-C3 N4的质量分数为10%时，g-C3 N4/ZnO的光降解效率最高，在2 h内罗丹明B（RhB）的降解率达到94%. (C)2015 Elsevier Inc. All rights reserved.
The pencil-like ZnO hollow tubes with 9-12 mu m in length, 350-700 nm in width, 200 nm in wall thickness coating with g-C3N4 have been prepared via a chemical deposition process. As compared with uncoated ZnO or g-C3N4, these g-C3N4/ZnO composites showed the enhanced photocatalytic activity which can be attributed to the heterojunction structure. Furthermore, it is worth pointing out that the weight ratios of g-C3N4 to ZnO (g-C3N4/ZnO) played a significantly influence on the photodegradable properties. With increasing the mass ratio, the photocatalytic activity increased firstly and then decreased after reaching to an optimal photocatalytic performance. It can be inferred that the appreciation of g-C3N4 on the ZnO surface can improve the contact area which resulted in high separation of electrons and holes. However, excessive g-C3N4 may hinder the electrons transferring from the g-C3N4 to ZnO, and thus worse its photocatalytic performance. In our study, the g-C3N4/ZnO sample prepared with 10 wt% of g-C3N4 exhibited the optimal photodegradable efficiency which 94% of Rhodamine B (RhB) has been degraded just in 2 h. (C) 2015 Elsevier Inc. All rights reserved.