掺杂镨的纳米二氧化钛光催化降解2,4-二硝基苯酚的研究  

Photocatalysis Efficiency of Degradation of 2,4-DNP by Praseodymium-Doped Nanometer TiO_2

作　　者：张俊卿[1] 赵团[1] 冯德荣[2] 郭军平[3] 

机构地区：[1]内蒙古科技大学材料与冶金学院 [2]包头明天科技股份有限公司,内蒙古包头014010 [3]天津和平海湾电源集团有限公司,天津300384

出　　处：《中国稀土学报》2006年第z1期63-65,共3页Journal of the Chinese Society of Rare Earths

摘　　要：以钛酸丁酯为原料,用溶胶-凝胶(sol-gel)法制备了掺杂镨的纳米TiO2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2 h后,0.5%(摩尔分数)Pr3+-TiO2纳米粉末为单一的锐钛型结构。通过粉体对2,4-二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TiO2相比,Pr3+-TiO2的光催化活性有较大提高,当Pr3+的掺入量为0.5%(摩尔分数)时催化活性最高。以高压汞灯为光源,2,4-二硝基苯酚的初始浓度为50 mg.L-1,催化剂0.5%(摩尔分数)Pr3+-TiO2投加量为1.0 g.L-1时,2,4-二硝基苯酚的光催化降解效果最好。Nanometer praseodymium 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 2 h,0.5%(mole fraction) Pr3+-TiO2 powders show that the nanocrystalline TiO2 with anatase phase.The photocatalytic oxidation properties were examined by the degradation of 2,4-dinitrophenol(2,4-DNP).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 2,4-DNP solution is 50 mg·L-1,a mount of catalyst is 1.0 g·L-1,the photocatalytic activity reaches the maximum.

关 键 词：溶胶-凝胶法 纳米二氧化钛 镨掺杂 2 4-二硝基苯酚 光催化氧化 稀土 

分 类 号：TQ134.1[化学工程—无机化工]