(1. 中南大学 化学化工学院, 长沙 410083;
2. 中南大学 粉末冶金国家重点实验室, 长沙 410083;
3. 中国石化催化剂长岭分公司, 岳阳 414012)
摘 要: 考察了通过溶胶-凝胶法进行过渡金属(Fe3+、 Zn2+、 Co2+、 Ni2+、 Cr3+和Sn4+)和稀土元素(La3+、 Pr3+、 Nd3+、 Ce4+、 Sm3+、 Tb3+、 Eu3+、 Gd3+、 Y3+和Dy3+)掺杂的TiO2纳米颗粒的光催化活性, 以及通过超声波处理反应过程中的溶胶所制备得到的TiO2纳米颗粒的光催化活性。 结果表明: 0.5%Sn4+、 0.5%La3+、 0.5%Y3+和0.5%Eu3+(质量分数)掺杂的TiO2纳米颗粒在降解甲基橙溶液的反应中, 其光催化活性提高2%~7%; 其它的掺杂则使TiO2纳米颗粒的光催化活性降低0.5%~25%; 在TiO2纳米颗粒的制备过程中, 对溶胶进行超声辐照可使其光催化活性提高15%以上, 这是提高TiO2纳米颗粒光催化活性的一条新途径。
关键字: TiO2纳米颗粒; 溶胶-凝胶法; 过渡金属; 稀土元素; 掺杂; 超声辐照; 光催化活性
( 1. School of Chemistry and Chemical Engineering,
Central South University, Changsha 410083, China;
2. State Key Laboratory of Powder Metallurgy,
Central South University, Changsha 410083, China;
3. Sinopec Changling Catalyst Division, Yueyang 414012, China)
Abstract: The photocatalytic activities of TiO2 nanoparticles doped with transition metal ions (Fe3+, Zn2+, Co2+, Ni2+, Cr3+ and Sn4+) and rare-earth metal ions (La3+, Pr3+, Nd3+, Ce4+, Sm3+, Eu3+, Gd3+, Y3+ and Dy3+) by sol-gel method and the TiO2 nanoparticles obtained from the sol with ultrasonic irradiation during their sol-gel synthesis were investigated. The results show that the photocatalytic activities of TiO2 nanoparticles doped with 0.5%Sn4+, 0.5%La3+, 0.5%Y3+ and 0.5%Eu3+ (mass fraction) increase 2%-7%, while photocatalytic activities doped by others decreases 0.5%-25% in the photocatalytic degradation of methylorange. The ultrasonic irradiation of the sol produced in the sol-gel synthesis of TiO2 nanoparticles can enhance their photocatalytic activity above 15%, which is a novel way to improve the photocatalytic activities of TiO2 nanoparticles.
Key words: TiO2 nanoparticles; sol-gel; transition metal; rare-earth metal; doping; ultrasonic irradiation; photocatalytic activity