ICCAS OpenIR
Effects of acidic and basic hydrolysis catalysts on the photocatalytic activity and microstructures of bimodal mesoporous titania
Yu, JG; Yu, JC; Leung, MKP; Ho, WK; Cheng, B; Zhao, XJ; Zhao, JC
2003-07-01
Source PublicationJOURNAL OF CATALYSIS
ISSN0021-9517
Volume217Issue:1Pages:69-78
AbstractBimodal mesoporous titania powders with high photocatalytic activity were prepared by hydrolysis of titanium tetraisopropoxide in the presence of HNO3 or NH4OH under ultrasonic irradiation. The powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), BET surface areas, and X-ray photoelectron spectroscopy (XPS). Photocatalytic activity was evaluated by the photocatalytic oxidation of acetone in air. The effects of catalysts added during hydrolysis on the microstructure and photocatalytic activity of the TiO2 powders were investigated. The results showed that HNO3 enhanced the growth of brookite, while NH4OH not only retarded phase transformation of the TiO2 powders from amorphous to anatase and anatase to rutile but also suppressed the growth of brookite. All TiO2 powders calcined from 400 to 600 degreesC showed bimodal pore-size distributions in the mesoporous region: one was intraaggregated pores with maximum pore diameters of ca. 4-9 nm and the other interaggregated ones with maximum pore diameters of ca. 35-50 nm. At 700 degreesC, the pore-size distributions of all samples exhibited monomodal distribution of the interaggregated pores due to the collapse of the intraaggregated pores. The photocatalytic activity of the TiO2 powders prepared by this method and calcined at 400 degreesC exceeded that of Degussa P-25 when the molar ratio of HNO3 or NH4OH to H2O was less than 0.05. (C) 2003 Elsevier Science (USA). All rights reserved.
KeywordMesoporous Titania Titanium Isopropoxide Hydrolysis Hno3 Nh4oh Microstructures Photocatalytic Activity
DOI10.1016/S0021-9517(03)00034-4
Indexed BySCI
Language英语
WOS IDWOS:000183224200008
PublisherACADEMIC PRESS INC ELSEVIER SCIENCE
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Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/79732
Collection中国科学院化学研究所
Corresponding AuthorYu, JC
Affiliation1.Chinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong, Peoples R China
2.Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China
3.Chinese Acad Sci, Inst Chem, Lab Photochem Ctr Mol Sci, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Yu, JG,Yu, JC,Leung, MKP,et al. Effects of acidic and basic hydrolysis catalysts on the photocatalytic activity and microstructures of bimodal mesoporous titania[J]. JOURNAL OF CATALYSIS,2003,217(1):69-78.
APA Yu, JG.,Yu, JC.,Leung, MKP.,Ho, WK.,Cheng, B.,...&Zhao, JC.(2003).Effects of acidic and basic hydrolysis catalysts on the photocatalytic activity and microstructures of bimodal mesoporous titania.JOURNAL OF CATALYSIS,217(1),69-78.
MLA Yu, JG,et al."Effects of acidic and basic hydrolysis catalysts on the photocatalytic activity and microstructures of bimodal mesoporous titania".JOURNAL OF CATALYSIS 217.1(2003):69-78.
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