Zhu Jianjun, Xie Jimin, Chen Min, Jiang Deli
School of the Environment, Jiangsu University, Zhenjiang 212013, P. R. China.
J Nanosci Nanotechnol. 2010 Nov;10(11):7663-6. doi: 10.1166/jnn.2010.2776.
The Eu(3+) doped TiO2-SiO2 photocatalysts, as a reclaimed visible-light responsive photocatalyst, were prepared by sol-gel method with TEOS, TBT and europium nitrate as precursors, by keeping the molar of TEOS:TBT constant at 1:1 and with different europium doping content. The resulting photocatalysts were characterized by XRD, TEM, SEM, EDX, UV-VIS DRS, FTIR and BET method. Analytical results demonstrated that only anatase phase is present in photocatalysts with high surface areas. The mean size is around 10 nm form TEM, which is consistent with the analytical result according to SEM. It can be seen methyl groups exist in photocatalysts based on analysis of FTIR and EDX. It was found that the resulting Eu(3+) doped photocatalysts exhibit higher photocatalytic activity than undoped photocatalysts and P25 on the degradation of rhodamine B(RhB, 10 mg/l) in water under visible light irradiation (lambda > 410). After irradiation for 3 h, the maximum absorption decreases gradually with irradiation time and absorption band shifts from 554 to 507 nm.
以正硅酸乙酯（TEOS）、钛酸四丁酯（TBT）和硝酸铕为前驱体，采用溶胶-凝胶法制备了Eu(3+)掺杂的TiO2-SiO2光催化剂，作为一种回收的可见光响应光催化剂，保持TEOS:TBT的摩尔比恒定为1:1，并具有不同的铕掺杂含量。通过X射线衍射（XRD）、透射电子显微镜（TEM）、扫描电子显微镜（SEM）、能谱分析（EDX）、紫外-可见漫反射光谱（UV-VIS DRS）、傅里叶变换红外光谱（FTIR）和比表面积分析（BET）方法对所得光催化剂进行了表征。分析结果表明，高比表面积的光催化剂中仅存在锐钛矿相。根据透射电子显微镜分析，平均粒径约为10nm，这与扫描电子显微镜的分析结果一致。基于傅里叶变换红外光谱和能谱分析可知，光催化剂中存在甲基。研究发现，所得Eu(3+)掺杂的光催化剂在可见光照射（λ>410）下对水中罗丹明B（RhB，10mg/l）的降解表现出比未掺杂的光催化剂和P25更高的光催化活性。照射3小时后，最大吸收峰随照射时间逐渐降低，吸收带从554nm移至507nm。
