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Effects of H2O2 generation over visible light-responsive Bi/Bi2O2-xCO3 nanosheets on their photocatalytic NOx removal performance
Lu, YF (Lu, Yanfeng)[ 1,2,3 ]1,2,3; Huang, Y (Huang, Yu)[ 1,2 ]; Zhang, YF (Zhang, Yufei)[ 1 ]; Huang, TT (Huang, Tingting)[ 1 ]; Li, HW (Li, Haiwei)[ 4 ]; Cao, JJ (Cao, Jun-ji)[ 1,2 ]; Ho, WK (Ho, Wingkei)[ 5 ]
2019-05-01
Source PublicationCHEMICAL ENGINEERING JOURNAL
Volume363Pages:374-382
Contribution Rank1
AbstractThe photocatalytic removal of gaseous NOx is commonly accompanied by secondary pollution, which necessitates the development of highly efficient nanostructured catalysts with a decreased propensity to toxic intermediate production. Herein, we describe the synthesis of plasmonic Bi/Bi2O2-xCO3 and demonstrate the presence of surface oxygen vacancies therein, revealing that the maximal NO, removal efficiency of Bi/Bi2O2-xCO3 under visible light irradiation reached 50.5% and exceeded that of a commercial photocatalyst, while the production of toxic NO2 as a by-product was completely suppressed (the selectivity reached up to 98%). In-situ introduction of plasmonic Bi on the surface of Bi2O2-xCO3 promoted the generation of H2O2 by capturing electrons from the defect states of Bi2O2-xCO3 via the two-electron reduction of O-2 and thus inhibited NO2 production (as confirmed by scavenger experiments), additionally broadening the light absorption range of the above photocatalyst. Moreover, surface oxygen vacancies in Bi-O layers provided a channel for electron transfer between Bi and Bi2O2-xCO3, which resulted in increased charge separation efficiency (maximum photocurrent = 1.1 Mu A cm(-2), 14.5 times higher than that of pristine Bi2O2CO3). Furthermore, the toxicity assessment authenticated good biocompatibility of Bi/Bi2O2-xCO3. Thus, this study sheds light on the possible roles of H2O2 in NOx degradation and provides an efficient surface engineering strategy to prepare highly reactive and selective photocatalysts.
KeywordPhotocatalysis NO oxidation Oxygen vacancy H2O2 Selectivity
Indexed BySCI ; SCIE
Language英语
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/10931
Collection粉尘与环境研究室
Corresponding AuthorHuang, Y (Huang, Yu)[ 1,2 ]
Affiliation1.Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, Xian 710061, Shaanxi, Peoples R China;
2.Chinese Acad Sci, Inst Earth Environm, SKLLQG, Xian 710061, Shaanxi, Peoples R China;
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China;
4.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Hong Kong, Peoples R China;
5.Hong Kong Inst Educ, Dept Sci & Environm Studies, Hong Kong, Peoples R China
Recommended Citation
GB/T 7714
Lu, YF ,Huang, Y ,Zhang, YF ,et al. Effects of H2O2 generation over visible light-responsive Bi/Bi2O2-xCO3 nanosheets on their photocatalytic NOx removal performance[J]. CHEMICAL ENGINEERING JOURNAL,2019,363:374-382.
APA Lu, YF .,Huang, Y .,Zhang, YF .,Huang, TT .,Li, HW .,...&Ho, WK .(2019).Effects of H2O2 generation over visible light-responsive Bi/Bi2O2-xCO3 nanosheets on their photocatalytic NOx removal performance.CHEMICAL ENGINEERING JOURNAL,363,374-382.
MLA Lu, YF ,et al."Effects of H2O2 generation over visible light-responsive Bi/Bi2O2-xCO3 nanosheets on their photocatalytic NOx removal performance".CHEMICAL ENGINEERING JOURNAL 363(2019):374-382.
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