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Excitation Wavelength Dependence of Photocatalyzed Oxidation of Methanol on TiO2(110)
Wang, Zhi-qiang; Hao, Qun-qing; Zhou, Chuan-yao; Dai, Dong-xu; Yang, Xue-ming
KeywordTitanium Dioxide Photocatalysis Excitation Wavelength Dependence Temperature-programmed Desorption
Source PublicationCHINESE JOURNAL OF CHEMICAL PHYSICS
2015-08-01
DOI10.1063/1674-0068/28/cjcp1507147
Volume28Issue:4Pages:459-464
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectPhysics, Atomic, Molecular & Chemical
WOS Research AreaPhysics
WOS KeywordMOLECULAR-HYDROGEN FORMATION ; FRACTAL REACTION-KINETICS ; TITANIUM-DIOXIDE ; SURFACE SCIENCE ; PHOTON ENERGY ; TIO2 PHOTOCATALYSIS ; METHYL FORMATE ; ADSORPTION ; WATER ; DISSOCIATION
AbstractPost-irradiation temperature-programmed desorption (TPD) has been used to study the photo catalyzed oxidation of methanol on TiO2(110) surface under the irradiation of 360, 380 and 400 nm light. The photocatalytic process initiated by ultraviolet light of different wavelength are similar. Methanol has been photocatalytically converted into formaldehyde, and the released hydrogen atoms transfer to the neighboring twofold coordinated oxygen to form bridging hydroxyls. The reaction rate, however, is strongly wavelength dependent. The reaction rate under 360 nm light irradiation is 4.8 times of that in the case of 400 nm exposure, consistent with a previous femtosecond time-resolved absorption measurement on TiO2 which shows the faster charge carrier recombination in the near-band-gap than the over-band-gap excitation. So far, the underlying factors which govern the excitation wavelength dependence of photocatalytic activity of TiO2 and other photocatalysts remain unclear, and future studies are needed to address this important issue.
Language英语
WOS IDWOS:000361418000013
Citation statistics
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/146548
Collection中国科学院大连化学物理研究所
AffiliationChinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China
Recommended Citation
GB/T 7714
Wang, Zhi-qiang,Hao, Qun-qing,Zhou, Chuan-yao,et al. Excitation Wavelength Dependence of Photocatalyzed Oxidation of Methanol on TiO2(110)[J]. CHINESE JOURNAL OF CHEMICAL PHYSICS,2015,28(4):459-464.
APA Wang, Zhi-qiang,Hao, Qun-qing,Zhou, Chuan-yao,Dai, Dong-xu,&Yang, Xue-ming.(2015).Excitation Wavelength Dependence of Photocatalyzed Oxidation of Methanol on TiO2(110).CHINESE JOURNAL OF CHEMICAL PHYSICS,28(4),459-464.
MLA Wang, Zhi-qiang,et al."Excitation Wavelength Dependence of Photocatalyzed Oxidation of Methanol on TiO2(110)".CHINESE JOURNAL OF CHEMICAL PHYSICS 28.4(2015):459-464.
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