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钒掺杂TiO2粉体的制备及性能 被引量:20

Preparation and properties of V-doped TiO2 powders
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摘要 严重的环境和能源问题推动了对以TiO2为主的半导体光催化材料的研究。金属阳离子掺杂TiO2,可以有效地提高光催化材料对可见光的响应及光催化性能。该文作者采用水相法制备以不同比率掺杂钒的TiO2粉体,并用H2SO4溶液浸渍处理,研究掺杂比率对粉体吸收光谱和光催化降解甲基橙的影响。结果表明:钒掺杂可以使TiO2粉体的光波长响应阈值移至600nm左右,大大提高了TiO2对可见光的吸收;钒的掺杂比率(摩尔分数)为2.5%时,粉体在普通日光灯下照射6h,对甲基橙的降解率达到69%,高于纯TiO2粉体;硫酸修饰则提高了掺杂钒的TiO2粉体的光催化性。 Environmental pollution and energy resources shortening have prompted an enormous research in TiO2 semiconductor-based photocatalysts over the last decade. Doping of metal cations into TiO2 is attracting a continuously increasing attention because of its high reactivity under visible-light. In the present paper's research, TiO2 powders doped with different concentration of vanadium were prepared by aqueous phase method, and the powders were infiltration treated in H2SO4 solution. The effects of doping concentration on the absorption spectrum and photocatalytic degradation of methyl orange were studied. The results indicate that the absorbing wavelength threshold value of V-doped TiO2 powders is shifted to about 600 nm, and it largely enhances the TiO2 absorption of visible light, then the optimum degradation rate of methyl orange is 69% higher than that of pure TiO2 after 6 h irradiation by a fluorescent lamp. The optimal concentration of vanadium is 2.5% (mol ratio), and the photocatalytic activity of V-doped TiO2 powders modified by H2SO4 solution is also improved.
作者 杨贞妮 刘强 朱忠其 张瑾 柳清菊 YANG Zhen-ni, LIU Qiang, ZHU Zhong-qi, ZHANG Jin, LIU Qing-ju (Department of Material Science and Engineering, Yunnan University, Kunming 650091, China)
出处 《粉末冶金材料科学与工程》 EI 2009年第1期 63-66,共4页 materials science and engineering of powder metallurgy
基金 教育部新世纪优秀人才支持计划项目(NCET-04.0915):云南省自然科学基金资助项目(2005EO007M)
关键词 可见光催化 钒掺杂 TIO2 甲基橙降解 photocatalytic activity under visible-light irradiation vanadium doping titanium dioxide degradation ofmethyl orange
作者简介 通讯作者:柳清菊,电话:0871—5035376:E-mail:qjliu@ynu.edu.cn
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