【摘要】 以钛酸四丁酯为钛源、硝酸镧为镧源、十二胺为模板剂,采用超声?水热法合成了La3+掺杂介孔TiO2微球,并利用XRD、XPS、TEM、BET、UV-Vis、IR、FL等手段表征了材料的结构、形貌、比表面积、孔径分布及光学性能.研究结果表明,适量La3+离子掺杂不仅能使介孔TiO2晶粒细化,比表面积增大,荧光强度减弱.La3+/TiO2的光吸收边红移,并具有比商业P25更好的光催化活性,其中介孔La3+/TiO2(2.0at%)的比表面积和平均孔径分别为132.7 m2/g和8.67 nm,光催化降解初始浓度为40 mg/L的亚甲基蓝溶液120 min时,其降解率达到98.5%,表现出最强的光降解能力.更多还原

【Abstract】 With tetrabutyl orthotitanate(TBOT) as Ti source,La(NO3)3.6H2O as La source and octadecylamine as a template,La-doped mesoporous TiO2 microspheres were prepared by ultrasonic-hydrothermal method.The ob-tained samples were characterized by XRD,XPS,TEM,BET,UV-Vis,IR and FL.The results revealed that the ap-propriate molar fraction of La dopant could decrease crystalline size,increase specific surface area and weaken fluorescence intensity of mesoporous TiO2.Compared with P25,the gap adsorption edge of mesoporous La3+/TiO2 exhibited a little red shift and slightly narrowed their band gaps.For mesoporous La3+/TiO2(2.0 at%),the specific surface area and the average pore diameter were 132.7 m2/g and 8.67 nm,respectively.Furthermore,the degradation ratio of methylene blue to mesoporous La3+/TiO2(2.0at%) was up to 98.5%,which exhibited the best photocatalytic activity with the initial concentration of 40 mg/L for 120 min.更多还原