Preparation and photocatalytic performance of Cu-doped TiO_2 nanoparticles

掺铜二氧化钛纳米颗粒的制备及其催化性能（英文）

Cu-doped TiO2 nanoparticles with different doping contents from 0 to 2.0% （mole fraction） were synthesized through sol-gel method. X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS） and field emission scanning electron microscope （FE-SEM） were used to characterize the crystalline structure, chemical valence states and morphology of TiO2 nanoparticles. UV-Vis absorption spectrum was used to measure the optical absorption property of the samples. The photocatalytic performance of the samples was characterized by degrading 20 mg/L methyl orange under UV-Vis irradiation. The results show that the Cu-doped TiO2 nanoparticles exhibit a significant increase in photocatalytic performance over the pure TiO2 nanoparticles, and the TiO2 nanoparticles doped with 1.0% Cu show the best photocatalytic performance. The improvement in photocatalytic performance is attributed to the enhanced light adsorption in UV-Vis range and the decrease of the recombination rate of photoinduced electron-hole oair of the Cu-doped TiO2 nanoparticles.

采用溶胶－凝胶法制备掺铜量为0～2．O％（摩尔分数）的二氧化钛纳米颗粒。应用X射线衍射（XRD）、X射线光电子能谱（XVS）和场发射电子显微镜（FE．SEM）技术对二氧化钛纳米颗粒的晶体结构、化学价态和形貌进行表征。样品的光学吸收性能用紫外～可见吸收光谱进行表征；其光催化性能通过在紫外－可见光照射下分解20mg／L甲基橙溶液进行表征。结果表明，掺铜二氧化钛纳米颗粒具有比纯二氧化钛更优的光催化性能，尤其是铜掺杂量为1．0％的二氧化钛TiO2纳米颗粒具有最好的光催化性能。铜掺杂能提高二氧化钛在紫外－可见光区对光的吸收、减小电子－空穴对的复合，因此，铜掺杂使二氧化钛的光催化性能得到提高。