钨掺杂钛酸锶纳米粒子的合成及其光催化性能研究  

Synthesis and photocatalytic activity properties of tungsten doped SrTiO nanoparticles

作　　者：谭冲 王欢欢 李俊生[2] 夏至[2] 左金龙[2] TAN Chong;WANG Huan-huan;LI Jun-sheng;XIA Zhi;ZUO Jin-long(School of Pharmacy,Harbin University of Commerce,Harbin 150076,China;School of Biotechnology and Food Engineering,Harbin University of Commerce,Harbin 150076,China)

机构地区：[1]哈尔滨商业大学药学院,黑龙江哈尔滨150076 [2]哈尔滨商业大学食品工程学院,黑龙江哈尔滨150076

出　　处：《分子科学学报》2020年第5期391-397,I0003,共8页Journal of Molecular Science

基　　金：黑龙江省自然科学基金资助项目(C2017037)。

摘　　要：以碳酸锶和钛酸丁酯作为锶源及钛源,采用溶胶-凝胶法,制备钨质量分数分别为0, 1%, 2%和3%的掺杂SrTiO3纳米粒子,利用XRD, SEM, PL, UV-Vis DRS, BET和XPS等手段对其进行了表征.以亚甲基蓝(MB)为模拟目标污染物,探讨了不同掺杂W量下SrTiO3在可见光下的光催化性能并进一步探讨了可能的光催化机理.实验结果表明,与纯SrTiO3相比,掺杂W后的SrTiO3光催化降解活性得到显著提高,掺杂量为2%时,在250 W汞灯照射10 h下,W掺杂的SrTiO3对MB的去除率可达95%,相比纯SrTiO3,去除率提高了1倍.分析催化机制表明,通过掺杂,在SrTiO3中引入缺陷位置,成为电子和空穴的浅势捕获阱,降低了电子-空穴对的复合速率,提高了光催化效率.Pure SrTiO3, 1%, 2% and 3% tungsten doped SrTiO3 were synthesized through sol-gel method using cesium carbonate and butyl titanate as the source of cerium and titanium. The catalysts were characterized by XRD, SEM, PL, UV-Vis DRS, BET and XPS. The photocatalytic activities were investigated by using methylene blue(MB) as the target pollutant under visible light irradiation and the mechanism of tungsten doped SrTiO3 composites was further studied. The experimental results show that when the doping amount is 2%, the removal rate of MB by tungsten-doped SrTiO3 can reach 95% under the irradiation of 250 W mercury lamp for 10 hours. Compared with pure SrTiO3, the removal rate is double. The analysis of catalytic mechanism shows that the defect position is introduced into SrTiO3 through doping to become a shallow potential trap for electron and hole, which reduces the recombination rate of electron hole pair and improves photocatalytic efficiency.

关 键 词：钛酸锶 钨 光催化 掺杂 溶胶凝胶法 

分 类 号：O643[理学—物理化学]