Photocatalytic oxidation of free cyanide over graphitic carbon nitride nanosheets under visible light

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 中国科学院饮用水科学与技术重点实验室

	Photocatalytic oxidation of free cyanide over graphitic carbon nitride nanosheets under visible light
	Guo, Yaping ; Wang, Yefeng ; Zhao, Shen ; Liu, Ze ; Chang, Hui ; Zhao, Xu
刊名	CHEMICAL ENGINEERING JOURNAL
	2019-08-01
卷号	369 页码:553-562
关键词	Graphitic carbon nitride Cyanides removal Heterogeneous photocatalysis Electron transfer
ISSN号	1385-8947
英文摘要	Photocatalytic oxidation of free cyanide (CN-) in water directly using solar energy is highly desired. However, most of the photocatalysts with effective performance are solely metal-based semiconductors. Herein, the metalfree graphitic carbon nitride nanosheets (g-C3N4-NS) have been prepared and utilized as photocatalysts for oxidation of CN- under visible light. The removal of CN- over g-C3N4-NS can reach 90% after 150 min when the initial concentration of CN- is 0.18 mM and the cyanate (CNO-) is the only product. The ESR and quenching experiment results reveal that the O2(center dot-) and (1)O(2 )play significant roles in the photocatalytic oxidation of CN- : first, the oxygen can be reduced by the photogenerated electrons (e(-)) from g-C3N4-NS to generate O2(center dot-)O2(center dot-) can be further reduced by e(-) to form the hydroperoxide anion (HO2) under the reaction conditions, then O2(center dot-)and HO2- can be converted to O-1(2), finally the CN(- )can be oxidized by O-1(2) to CNO-. In addition, the recycle experiment and the characterization results of the g-C3N4-NS indicate that the g-C3N4-NS is stable.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/43504]
专题	生态环境研究中心_中国科学院饮用水科学与技术重点实验室
作者单位	1.Zhejiang Univ Technol, Coll Environm, Hangzhou 310014, Zhejiang, Peoples R China 2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Guo, Yaping,Wang, Yefeng,Zhao, Shen,et al. Photocatalytic oxidation of free cyanide over graphitic carbon nitride nanosheets under visible light[J]. CHEMICAL ENGINEERING JOURNAL,2019,369:553-562.
APA	Guo, Yaping,Wang, Yefeng,Zhao, Shen,Liu, Ze,Chang, Hui,&Zhao, Xu.(2019).Photocatalytic oxidation of free cyanide over graphitic carbon nitride nanosheets under visible light.CHEMICAL ENGINEERING JOURNAL,369,553-562.
MLA	Guo, Yaping,et al."Photocatalytic oxidation of free cyanide over graphitic carbon nitride nanosheets under visible light".CHEMICAL ENGINEERING JOURNAL 369(2019):553-562.