掺杂镨的纳米二氧化钛光催化降解对硝基苯酚的研究

Study on the photocatalysis efficiency of degradation of p-nitraphenol by a praseodymium-doped nanometer TiO_2

以钛酸丁酯为原料,用溶胶-凝胶(So l-gel)法制备了掺杂镨的纳米T iO2粉末。采用X光衍射仪对粉体的物相进行了表征。样品经500℃焙烧2h后,0.5%(摩尔分数)P r3+-T iO2纳米粉末为单一的锐钛型结构。通过粉体对对硝基苯酚的降解情况对其光催化活性进行了测试,结果表明与纯T iO2相比,P r3+-T iO2的光催化活性有较大提高,当P r3+的掺入量为摩尔比0.5%时催化活性最高。以高压汞灯为光源,对硝基苯酚的初始浓度为50m g.L-1、催化剂0.5%(摩尔分数)P r3+-T iO2投加量为1.0 g.L-1时,对硝基苯酚的光催化降解效果最好。

Nanometer iron doped TiO2 powder was obtained from tetrabutyl titanate by Sol- gel method. The phase and size were analyzed by XRD. After calcination at 500℃ for 2h, 0.5% （in mole per cent）Pr^3＋-TiO2powders show that the nanocrystalline TiO2with anatase phase. The photocatalytic oxidation properties were examined by the degradation of p-nitraphenol. The results indicate that the photocatalytic activity of the composite particles is higher than that of pure ultrafine TiO2, and the optimum loading of Pr is 0. 5%（in mole per cent）. Under illumination by high pressure mercury lamp,the results show that when initial concentration of p-nitraphenol solution is 50 mg · L^-1 ,a mount of catalyst is 1.0 g·L^-1,the photocatalytic activity reach the maximum.