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Environment-Friendly Carbon Quantum Dots/ZnFe2O4 Photocatalysts: Characterization, Biocompatibility, and Mechanisms for NO Removal
Huang, Yu1,2; Liang, Yanling1; Rao, Yongfang3; Zhu, Dandan1; Cao, Jun-ji1,2; Shen, Zhenxing3; Ho, Wingkei4; Lee, Shun Cheng5
2017-03-07
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume51Issue:5Pages:2924-2933
SubtypeArticle
AbstractA highly efficient and environmentally-friendly oxidation process is always desirable for air purification. This study reported a novel carbon quantum dots (CQDs)/ZnFe2O4 composite photocatalyst for the first time through a facile hydrothermal process. The CQDs/ZnFe2O4 (15 vol %) composite demonstrates stronger transient photocurrent response, approximately 8 times higher than that of ZnFe2O4, indicating superior transfer efficiency of photogenerated electrons and separation efficiency of photogenerated electron hole pairs. Compared with pristine ZnFe2O4 nano particles, CQDs/ZnFe2O4 displayed enhanced photocatalytic activities on gaseous NOx removal and high selectivity for nitrate formation under visible light (lambda > 420 nm) irradiation. Electron spin resonance analysis and a series of radical-trapping experiments showed that the reactive species contributing to NO elimination were center dot O-2(-) and center dot OH radicals. The possible mechanisms were proposed regarding how CQDs improve the photocatalytic performance of ZnFe2O4. The CQDs are believed to act as an electron reservoir and transporter as well as a powerful energy-transfer component during the photocatalysis processes over CQDs/ZnFe2O4. samples. Furthermore, the toxicity assessment authenticated good biocompatibility and low cytotoxity of CQDs/ZnFe2O4. The results of this study indicate that CQDs/ZnFe2O4 is a promising photocatalyst for air purification.
WOS HeadingsScience & Technology ; Technology ; Life Sciences & Biomedicine
DOI10.1021/acs.est.6b04460
WOS KeywordVISIBLE-LIGHT ; HYDROGEN GENERATION ; EFFICIENT PHOTOCATALYST ; ORGANIC POLLUTANTS ; HIGHLY EFFICIENT ; NANOTUBE ARRAYS ; IONIC LIQUID ; DOTS ; DEGRADATION ; SPINEL
Indexed BySCI
Language英语
WOS Research AreaEngineering ; Environmental Sciences & Ecology
WOS SubjectEngineering, Environmental ; Environmental Sciences
WOS IDWOS:000395963800052
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/5495
Collection粉尘与环境研究室
Affiliation1.Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, Xian 710061, Peoples R China
2.Chinese Acad Sci, Inst Earth Environm, SKLLQG, Xian 710061, Peoples R China
3.Xi An Jiao Tong Univ, Dept Environm Sci & Engn, Xian 710049, Peoples R China
4.Educ Univ Hong Kong, Dept Sci & Environm Studies, Hong Kong, Hong Kong, Peoples R China
5.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Hong Kong, Peoples R China
Recommended Citation
GB/T 7714
Huang, Yu,Liang, Yanling,Rao, Yongfang,et al. Environment-Friendly Carbon Quantum Dots/ZnFe2O4 Photocatalysts: Characterization, Biocompatibility, and Mechanisms for NO Removal[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2017,51(5):2924-2933.
APA Huang, Yu.,Liang, Yanling.,Rao, Yongfang.,Zhu, Dandan.,Cao, Jun-ji.,...&Lee, Shun Cheng.(2017).Environment-Friendly Carbon Quantum Dots/ZnFe2O4 Photocatalysts: Characterization, Biocompatibility, and Mechanisms for NO Removal.ENVIRONMENTAL SCIENCE & TECHNOLOGY,51(5),2924-2933.
MLA Huang, Yu,et al."Environment-Friendly Carbon Quantum Dots/ZnFe2O4 Photocatalysts: Characterization, Biocompatibility, and Mechanisms for NO Removal".ENVIRONMENTAL SCIENCE & TECHNOLOGY 51.5(2017):2924-2933.
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