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利用溶胶-凝胶法制备了粒径约为13nm、晶型为锐钛矿相和金红石相混晶的TiO2光催化剂,并利用此催化剂对挥发性有机污染物苯和甲苯进行了光催化降解研究,对不同的催化剂用量、光源、污染物的初始浓度以及氧气对光催化反应速率的影响进行了研究。结果表明,光催化降解甲苯和苯的反应均符合假一级动力学方程,光强与光催化降解甲苯的反应的速率常数之间呈指数关系,光波长对光催化降解苯的影响也很显著;随着甲苯和苯初始浓度的增加,光催化反应速率常数降低;氧气加快了光催化降解甲苯和苯的速率;对于光催化降解初始浓度为37.6μmol/L的甲苯而言,催化剂的最佳使用量为0.30g,对于光催化降解初始浓度为9.0μmol/L的苯来说,催化剂的最佳用量为0.10g。
A TiO2 photocatalyst with a particle size of about 13 nm and an anatase phase and rutile phase mixed crystal was prepared by sol-gel method. The photocatalytic degradation of volatile organic compounds (benzene and toluene) was studied using this catalyst The effects of different amount of catalyst, initial concentration of light source, pollutant and oxygen on the photocatalytic reaction rate were studied. The results show that the photocatalytic degradation of toluene and benzene are in line with pseudo-first-order kinetic equation, the light intensity and photocatalytic degradation of toluene reaction rate constant between the exponential relationship, the wavelength of light on the photocatalytic degradation of benzene is also significant ; With the initial concentration of toluene and benzene increased, the photocatalytic reaction rate constant decreased; oxygen accelerated the rate of photocatalytic degradation of toluene and benzene; for the photocatalytic degradation of toluene initial concentration of 37.6μmol / L, the best catalyst The amount of 0.30g, for the initial photocatalytic degradation of benzene concentration of 9.0μmol / L, the optimal amount of catalyst is 0.10g.