Surprisingly advanced CO2 photocatalytic conversion over thiourea derived g-C3N4 with water vapor while introducing 200-420 nm UV light

被引：59

作者：

Wang, Haiqiang ^{[1
,2
]}

Sun, Zhuxing ^{[1
,2
]}

Li, Qian ^{[1
]}

Tang, Qijun ^{[1
]}

Wu, Zhongbiao ^{[1
,2
]}

机构：

[1] Zhejiang Univ, Dept Environm Engn, Hangzhou 310058, Zhejiang, Peoples R China

[2] Zhejiang Prov Engn Res Ctr Ind Boiler & Furnace F, Hangzhou 311202, Zhejiang, Peoples R China

来源：

JOURNAL OF CO2 UTILIZATION | 2016年 / 14卷

基金：

中国国家自然科学基金;

关键词：

CO2; reduction; UV light; Photocatalysis; Carbon nitride; Thiourea; GRAPHITIC CARBON NITRIDE; EFFICIENT PHOTOCATALYST; HYDROCARBON FUEL; REDUCTION; PHOTOREDUCTION; DIOXIDE; TIO2; HYDROGEN; PERFORMANCE; SELECTIVITY;

D O I：

10.1016/j.jcou.2016.04.006

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

200-420 nm UV light was for the first time introduced for CO2 photocatalytic reduction over graphitic carbon nitride (g-C3N4). It was surprisingly found that thiourea derived g-C3N4 (TCN), which showed inferior activity in CO2 reduction under visible light irradiation, exhibited more remarkable CO2 conversion efficiency under > 200 nm light irradiation compared to g-C3N4 synthesized from urea (UCN) and commercial TiO2 (P25). Also, the highest selectivity to CO2 conversion was observed over TCN while P25 showed the most prominent H-2 production followed by UCN. Through a series of characterizations, the more abundant -NHx species that were responsible for CO2 activation, the enhanced reducing ability of photo-excited electrons under UV light and the higher photo-exited electron-hole separation efficiency were supposed to contribute to the excellent CO2 photocatalytic reduction activity of TCN under > 200 nm UV-vis light irradiation, whilst its visible-light activity was relatively weak because of its limited surface area. Further, TCN performed a wonderful stability with a good record of circle tests in this irradiation condition. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：143 / 151

页数：9

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