稀土掺杂TiO_2光催化剂的制备及产氢性能研究  

Preparation of RE/TiO_2 Photocatalysts and Its Photocatalytic H_2 Production

作　　者：郑先君[1] 姜巧娟[1] 魏丽芳[1] 张治红[1] 谢冰[1] 孙晓丽[1] 魏明宝[1] 

机构地区：[1]郑州轻工业学院河南省表界面重点实验室,河南郑州450002

出　　处：《中国稀土学报》2010年第1期22-26,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(20704039);河南省教育厅自然科学基金项目(2007610015)资助

摘　　要：采用溶胶-凝胶法制备了稀土掺杂的系列光催化剂RE/TiO2(La/TiO2,Eu/TiO2,Y/TiO2,Pr/TiO2,Nd/TiO2,Sm/TiO2,Gd/TiO2),XRD晶相结构表征分析表明稀土离子的掺杂有效抑制了TiO2晶粒的增长。分别考察了不同酸、醇为牺牲剂时RE/TiO2对光催化产氢性能的影响。实验结果表明:以乙醇为牺牲剂时,稀土的掺杂均提高了光催化产氢性能;以乙酸为牺牲剂时,只有铕和镧的掺杂提高了光催化活性。以La/TiO2为光催化剂,甲醇、乙醇和正丙醇为牺牲剂,光催化产氢活性顺序为:乙醇>甲醇>正丙醇;以Eu/TiO2为光催化剂,以甲酸、乙酸和丙酸为牺牲剂,光催化产氢活性依次为:甲酸>丙酸>乙酸;因此,牺牲剂的选择对光催化产氢活性有重要的影响。A series of RE/TiO2 （ La/TiO2, Eu/TiO2, Y/TiO2, Pr/TiO2, Nd/TiO2, Sm/TiO2, Gd/TiO2 ） photocatalyst powders were prepared by sol-gel method. The characterization by XRD showed that the TiO2 doped with small amount of rare earth ions could effectively restrain growth of TiO2 particle. The effects of various sacrificial reagents such as acids and alcohols, on photoeatalytic H2 activity were investigated. The experimental results showed that the photocatalytic H2 activity of RE/TiO2 was enhanced by doping with rare earth ions when ethanol was used as sacrificial rea gent. On the other hand, using acetic acid as sacrificial reagent, photocatalytic H2 activity of RE/TiO2 was enhanced only by doping with Eu and La ions. Using La/TiO2 as photocatalyst and alcohols as sacrificial reagent, the photocatalytic H2 activity changed in order of ethanol 〉 methanol 〉 propanol. However, when Eu/ TiO2 used as photocatalyst and acids as sacrificial reagent, the photocatalytic H2 activity changed in order of formic acid 〉 propionic acid 〉 acetic acid. Therefore,the choice of various sacrificial reagents had a great effect on photocatalytic HE production.

关 键 词：TIO2 掺杂 酸 醇 光催化制氢 稀土 

分 类 号：TQ426.94[化学工程]