期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 336, 期 -, 页码 54-62出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2016.12.018
关键词
Graphitic carbon nitride; Peroxymonosulfate; Acid Orange 7; Degradation
资金
- Natural Science Foundation of Hubei Province [2016CFB578]
Graphitic carbon nitride materials (g-C3N4) were prepared from melamine hydrochloride under different calcination temperatures, and were investigated as metal-free catalysts for Acid Orange 7 degradation in the presence of peroxymonosulfate (PMS) under visible light. It was found that with the increase of calcination temperature, the morphological features of g-C3N4 change from a typical flat layer structure with numerous mesopores to a thinner platelet-like structure, accompanied by the increase of BET surface area. The increase of heating temperature can also enlarge the band gap of g-C3N4. But under a higher temperature of 600 degrees C, the band gap is significantly reduced, probably due to the decrease of the structure defects. The obtained samples can effectively activate PMS under visible light irradiation to generate reactive species such as sulfate radicals, superoxides and photogenerated hole for dye degradation. Compared with the samples obtained from melamine, the activity is much higher, attributed to the dramatic enhancement of BET surface area. The catalysts also present a long-term stability during multiple runs. The effect of several reaction parameters and the formation of intermediates were also discussed. This study can improve our understanding of PMS activation on g-C3N4 catalysts under visible light for pollutants removal. (C) 2016 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据