Enhanced Photocatalytic Performance of Anatase TiO_(2) by Deposition-Precipitation Treatment  

沉积沉淀法处理增强锐钛矿TiO_(2)光催化性能研究

作　　者：Mengqi Wan Qian Wen Mengyi Ci Wangyang Li Zhen Zhang 万梦奇;文茜;慈梦怡;李汪阳;张镇(中国科学技术大学化学物理系,合肥230026;中国科学技术大学合肥微尺度物质科学国家研究中心,合肥230026)

机构地区：[1]Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes,Department of Chemical Physics,University of Science and Technology of China,Hefei 230026,China [2]Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Journal of Chemical Physics》2024年第4期531-538,I0094,共9页化学物理学报（英文）

基　　金：supported by the National Key Research and Development Program of China(No.2021YFA1500403);the National Natural Science Foundation of China(No.21773047 and No.U1832180);partially carried out at the USTC Center for Micro and Nanoscale Research and Fabrication.

摘　　要：Deposition-precipitation(DP)method is commonly used to prepare the supported metal catalysts.In this study,the modification effect of the mild DP method on the photocatalytic performance of TiO_(2)was investigated.The TiO_(2)samples with DP treatment,as well as Au/TiO_(2)prepared under the same conditions,showed enhanced photocatalytic performance of the degradation of methylene blue(MB).·OH generated by photoexcited holes is identified as the main intermediate reactive species during the degradation reaction.X-ray photoelectron spectroscopy(XPS)and Fourier transform infrared spectroscopy(FTIR)show that TiO_(2)(A)-17 after DP treatment has the most amount of surface OH^(-)_(ad)species.The presence of surface OH^(-)_(ad)species not only changes the surface zeta potential,favoring the attraction of cationic MB;but also depresses the electron-hole recombination,favoring photodegradation of MB by hole-produced·OH.An implication of these findings is that the modification of support properties should be taken into account while preparing supported metal catalysts using DP methods.沉积沉淀法常用于制备负载型催化剂.本文研究了温和的沉积沉淀处理条件对TiO_(2)光催化性能的影响.经沉积沉淀处理后的TiO_(2)和相同条件下制备的Au/TiO_(2)一样,对亚甲基蓝的降解表现出较好的光催化性能.由光生空穴生成的羟基自由基被证实是降解过程中的主要活性物种.X射线光电子能谱与红外漫反射光谱表征显示沉积沉淀处理时间为17小时得到的样品TiO_(2)(A)-17具有最多的表面吸附羟基,吸附羟基既可以改变表面zeta电位利于阳离子染料亚甲基蓝的吸附,还可以抑制光生载流子的复合,加快由空穴生成的羟基自由基生成速率,从而提高降解效率.本工作表明在使用沉积沉淀法制备负载型金属催化剂时,应考虑制备方法本身对载体性能的影响.

关 键 词：TiO_(2) PHOTOCATALYSIS ·OH Deposition-precipitation method 

分 类 号：TQ134.11[化学工程—无机化工] O643.36[理学—物理化学] O644.1[理学—化学]