摘要
采用溶胶-凝胶-微波法以无水乙醇为溶剂,制备了Fe^(3+)和Er^(3+)不同摩尔配比共掺的TiO_2纳米粒子,在N2保护下加热至500℃,获得具有稳定锐钛矿型结构的Fe^(3+)和Er^(3+)共掺TiO_2纳米晶体(Fe^(3+)-Er^(3+)-TiO_2)光催化剂.对于Fe^(3+),Er^(3+)不同摩尔配比共掺的纳米TiO_2光催化剂,在掺入量相同时,紫外及可见光下的光催化活性最强.采用扫描电镜(SEM)和透射电镜(TEM)对样品的表面结构进行测试,结果显示Fe^(3+)-Er^(3+)-TiO_2纳米光催化剂晶体尺寸为25 nm^30 nm;X衍射仪测试样品,其XRD图谱峰值显示晶型结构为锐钛矿型,荧光光谱(FL)和紫外-可见(UV-Vis)光谱显示材料的吸收波长范围为370 nm^770 nm.利用Fe^(3+)-Er^(3+)-TiO_2纳米光催化剂在紫外及可见光下降解N-(2-苯并咪唑基)-氨基甲酸甲酯,反应过程以高效液相色谱(HPLC)对N-(2-苯并咪唑基)-氨基甲酸甲酯浓度进行检测,结果显示掺入Fe^(3+),Er^(3+)可提高TiO_2的光催化活性,从反应动力学和机理分析掺入Fe^(3+),Er^(3+)可增加光反应孤对电子从而提高反应液中HO·含量.
Erbium-Ion（Er^3＋） and Ferric-Ion（Fe^3＋） with the different molar ratio doped TiO2 nanoparticles wereprepared by sol-gel-microwave process in anhydrous ethanol solvent. We got Fe^3＋and Er^3＋codoped TiO2photo-catalysts（Fe^3＋-Er^3＋-TiO2） with stable anatase structure by calcining the dried gel of sample in N2 atmosphere at 500℃.Compared with all samples of Fe^3＋and Er^3＋doped TiO2 nanoparticles, Fe^3＋ and Er^3＋with the same molar of ratio doped TiO2 showed the best photocatalytic activity under UV and visible light. The surface morphology and crystalline size of samples were monitored using a scanning electron microscope（SEM） and high-resolution transmission electron microscopy（TEM）. The results showed that the range of Fe^3＋-Er^3＋-TiO2 crystalline size was in 25-30 nm. The particle crystalline structure corresponded to anatase determined by X-Ray-diffraction（XRD）. The rang of Fe^3＋-Er^3＋-TiO2 absorption spectra was 370-770 nm measured by Fluorescence spectra and UV-Vis absorption spectra. Photo-catalytic degradation of carbendazim was performed under UV and visible light. In the whole process, the concentration of carbendazim were collected at regular intervals and analyzed by HPLC. The results showed that catalytic activity of TiO2 was enhanced by co-doped Fe^3＋and Er^3＋. Lone pair electrons will increase with increasing the dosage of the Fe^3＋and Er^3＋concentration, which will improve the content of HO·in reaction liquid.
出处
《广西科技大学学报》
2016年第4期105-110,121,共7页
Journal of Guangxi University of Science and Technology
基金
2014年广西壮族自治区新型墙体材料专项基金项目(2015602)资助
作者简介
谭春雷，硕士，助理工程师，研究方向：复合功能材料，E—mail：tcl5594154@sina．com．
