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利用TiO2 催化剂薄膜进行光催化反应时,根据光照方式的不同可分为正光催化和背光催化.两者相比,背光催化可以避免光在溶液中的衰减而造成的光能损失.本文研究了背光催化时薄膜的厚度,光源波长的选择,及其非均掺杂V对催化效率的影响,同时与正光催化的情况作了比较.结果表明:与正光催化明显不同,背光催化时催化剂薄膜厚度对应于光源波长有一个最佳值,光源波长也只能选择大约在30 0～388nm之间;非均匀掺杂情况与正光催化相同,能提高薄膜的催化效率.
The photocatalytic reaction using TiO2 photocatalyst film can be divided into positive photocatalysis and back photocatalysis according to the different illumination modes, which can avoid the loss of light energy caused by the decay of light in solution.In this paper, The thickness of photocatalyst, the choice of the wavelength of light source and the influence of heterogeneous doping V on the catalytic efficiency were compared with that of the photocatalytic photocatalytic activity. The results showed that the photocatalytic activity of the photocatalyst was significantly different from that of the photocatalyst In the light source wavelength has an optimum value, the light source wavelength can only choose between about 30 0 ~ 388nm; non-uniform doping and the same positive photocatalytic, can improve the catalytic efficiency of the film.