Effect of the addition of a small amount of vanadium on the photocatalytic activities of N- and Si- co-doped titanias under visible-light irradiation
Effect of the addition of a small amount of vanadium on the photocatalytic activities of N- and Si- co-doped titanias under visible-light irradiation
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DOI：
10.1007/s10562-007-9029-5
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发表时间：
2007-02
影响因子：
2.8
通讯作者：
H. Ozaki;S. Iwamoto;M. Inoue
中科院分区：
文献类型：
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作者：
H. Ozaki;S. Iwamoto;M. Inoue
采用四异丙醇钛和正硅酸四乙酯在1,4-丁二醇中300℃热反应（糖热反应）制备了Si/Ti电荷比为0.2的硅掺杂钛，采用nh3流加热的方法制备了N和Si共掺杂钛。N-和Si共掺杂的二氧化钛在400 ~ 550 nm的可见光区域有较强的吸收，在可见光照射下对乙醛的分解表现出较高的光催化活性。本研究采用钒酸铵溶液浸渍法对N-和Si共掺杂的钛进行了进一步的钒改性，并通过XRD、BET比表面积测量、UV-vis和ESR对催化剂进行了表征。研究了负载V的N和Si共掺杂二氧化钛对乙醛的光催化分解，结果表明，极少量的V负载（V/Ti = 0.0001-0.001）显著增强了可见光照射下的光催化活性。
Si-doped titanias with a Si/Ti charged ratio of 0.2 was prepared by thermal reactions of titanium tetraisopropoxide and tetraethyl orthosilicate in 1,4-butanediol at 300 °C (glycothermal reaction) and N- and Si- co-doped titanias were prepared by heating the thus-obtained Si-doped titanias in an NH3flow. N- and Si- co-doped titanias had a stronger absorption in a visible light region of 400–550 nm, and exhibited high photocatalytic activities for decomposition of acetaldehyde under visible-light irradiation. In this study, N- and Si- co-doped titanias were further modified with vanadium by an impregnation method using an ammonium vanadate solution, and the obtained catalysts were characterized by XRD, BET surface area measurement, UV-vis, and ESR. Photocatalytic decomposition of acetaldehyde using the V-loaded N- and Si- co-doped titanias was examined and it was demonstrated that a very small amount of V-loading (V/Ti = 0.0001–0.001) significantly enhanced the photocatalytic activity under visible-light irradiation.