摘要
为了研究溶胶-凝胶自蔓燃法(SHS)制备的铁掺杂纳米TiO2的光催化活性,以TiCl4为原料制备了Fe3+掺杂TiO2光催化剂,分别在低压汞灯、中压汞灯和太阳光照射下进行了亚甲基蓝降解实验。XRD和SEM显示,以TiCl4为前驱体,n(Ti):n(柠檬酸):n(NH4NO3)=1:3:5,经250℃自蔓燃和500℃热处理后,TiO2呈疏松、多孔的灰白色锐钛型粉体,粒径约为20nm;在不同光源作用下,掺铁摩尔分数为0.02%的TiO2催化活性均最大;亚甲基蓝溶液在掺铁分数为0.02%的TiO2作用下,经太阳光照90min后降解率达到了96.1%,为纯TiO2的1.78倍。
A Fe3＋-doped nanosized TiO2 photocatalyst was synthesized from a sol-gel based self-propagating high-temperature synthesis process（SHS） with TiCl4 as the raw material.Its photocatalytic activity was studied by probing the degradation of methylene blue（MB） under different light irradiations including sunlight,low and high pressure mercury lamps.XRD and SEM results indicate that the as-prepared nanoscale TiO2 powder is a porous anatase material after SHS at 350 ℃ and heat-treatment at 500 ℃.The optimal precursor molar ratio of n（Ti）：n（citric acid）：n（NH4NO3） is 1：3：5,the particle size is ～ 20 nm.Experimental results show that the highest photocatalytic activity of Fe3 ＋-doped TiO2 could be achieved when the molar ratio of Fe3 ＋ to TiO2is 0.02%.Removing rate of MB was 96.1% with Fe3 ＋-doped TiO2 as catalyst and sunlight as light source,which is 1.78 times of that of pure TiO2.
出处
《应用化学》
CAS
CSCD
北大核心
2010年第10期1177-1181,共5页
Chinese Journal of Applied Chemistry
基金
海南省重点科技项目(070601)
海南省自然科学基金资助项目(209005)
国家大学生创新课题(081165815)
关键词
溶胶-凝胶自蔓燃
铁掺杂
TIO2
光催化
sol-gel based self-propagating high-temperature synthesis process
Fe3＋-doped
TiO2
photocatalysis
