摘要
采用一步水热法制备锐钛矿/金红石TiO_2混合晶体,探讨锐钛矿相和金红石相比例对光催化降解罗丹明B的性能影响以及混晶TiO_2的光催化机理。结果表明,当金红石相的比例为20%,TiO_2混晶在紫外辐射和太阳光下,使初始浓度10 mg/L的罗丹明B完全降解的时间分别为50 min和150 min;活性物捕捉实验证明,·OH为催化体系中的关键活性物质。
Mixed crystal TiO_2(anatase/rutile) was prepared by one step hydrothermal method.The effects of the proportion of anatase and rutile on the performance of photocatalytic degradation of Rh B and the photocatalytic mechanism of mixed crystal TiO_2 were investigated with Rhodamine B as a simulated pollutant.Results show that,when the rate of rutile phase is 20%,the time that Rhodamine B(~10 mg/L) completely degraded in under ultraviolet light irradiation(~60 W) and natural light is 50 min and 150 min,respectively.· OH is the key active substance in the catalytic system.
引文
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