Insights into the role of singlet oxygen in the photocatalytic hydrogen peroxide production over polyoxometalates-derived metal oxides incorporated into graphitic carbon nitride framework

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

	Insights into the role of singlet oxygen in the photocatalytic hydrogen peroxide production over polyoxometalates-derived metal oxides incorporated into graphitic carbon nitride framework
	Zhao, Shen ; Zhao, Xu
刊名	APPLIED CATALYSIS B-ENVIRONMENTAL
	2019-08-05
卷号	250 页码:408-418
关键词	Graphitic carbon nitride Polyoxometalates Photocatalytic hydrogen peroxide production Oxygen reduction Singlet oxygen
ISSN号	0926-3373
英文摘要	To develop a new strategy of enhancing the photoinduced holes (h(+)) consumption to promote the photoinduced electrons (e(-)) utilization for O-2 reduction to H2O2 and maintaining the chemical stability of g-C3N4-based catalysts, the hybrid catalyst of g-C3N4-CoW0 has been prepared through the calcination of the graphitic carbon nitride (g-C3N4) precursor of 3-amino 1, 2, 4-triazole (3-AT) and the polyoxometalates (POMs) precursor of (NH4)(8)Co2W12O42 (NH4-CO2W12). The hybrid catalyst of g-C3N4-CoW0 with well-defined and stable structure exhibits efficient catalytic performance (9.7 timolh4) for photocatalytic H2O2 production in the absence of organic electron donor under visible light. The value of electrons transfer during the oxygen reduction reaction (ORR) process obtained from the Koutecky-Levich plot for g-C3N4-CoWO (n = 1.95) is higher than that for gC(3)N(4) (n = 1.18), suggesting that the CoWO incorporated into g-C3N4 framework can generate more e- for 02 reduction. The superoxide radicals CO2-) quantitative and scavenger experiments combined with the electron spin resonance (ESR) results reveal that the negative shifts of the conduction band (CB) level from g-C3N4 to gC(3)N(4)-CoW0 can enhance the single-electron reduction of O-2 to 'O-2(-). The h+ and 102 scavenger experiments results combined with the ESR results demonstrate that the CoWO incorporated into g-C3N4 framework can promote the oxidation of 'O-2- to 'O-2 by h+. The 102 quantitative experiments results indicate that the 'O-2 can proceed two-electron reduction to H2O2. The enhanced h(+) consumption and the 102 transferred from 'O-2(-) can promote the photocatalytic H2O2 production over g-C3N4-CoWO. In addition, the recycle experiment results reveal that the heterogeneous g-C3N4-CoWO is catalytic stable.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/43478]
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.Chinese Acad Sci, Ecoenvironm Sci Res Ctr, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Shen,Zhao, Xu. Insights into the role of singlet oxygen in the photocatalytic hydrogen peroxide production over polyoxometalates-derived metal oxides incorporated into graphitic carbon nitride framework[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2019,250:408-418.
APA	Zhao, Shen,&Zhao, Xu.(2019).Insights into the role of singlet oxygen in the photocatalytic hydrogen peroxide production over polyoxometalates-derived metal oxides incorporated into graphitic carbon nitride framework.APPLIED CATALYSIS B-ENVIRONMENTAL,250,408-418.
MLA	Zhao, Shen,et al."Insights into the role of singlet oxygen in the photocatalytic hydrogen peroxide production over polyoxometalates-derived metal oxides incorporated into graphitic carbon nitride framework".APPLIED CATALYSIS B-ENVIRONMENTAL 250(2019):408-418.