首页|沉积沉淀法处理增强锐钛矿TiO2光催化性能研究

沉积沉淀法处理增强锐钛矿TiO2光催化性能研究

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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TiO2光催化性能的影响.经沉积沉淀处理后的TiO2和相同条件下制备的Au/TiO2一样,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TiO2(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.
Enhanced Photocatalytic Performance of Anatase TiO2 by Deposition-Precip-itation Treatment
Deposition-precipitation(DP)method is common-ly used to prepare the sup-ported metal catalysts.In this study,the modifica-tion effect of the mild DP method on the photocat-alytic performance of TiO2 was investigated.The TiO2 samples with DP treatment,as well as Au/TiO2 prepared under the same conditions,showed enhanced photocatalytic performance of the degradation of methylene blue(MB).OH generated by photoexcited holes is identi-fied as the main intermediate reactive species during the degradation reaction.X-ray photo-electron spectroscopy(XPS)and Fourier transform infrared spectroscopy(FTIR)show that TiO2(A)-17 after DP treatment has the most amount of surface OHad-species.The presence of surface OHad-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 sup-port properties should be taken into account while preparing supported metal catalysts using DP methods.

TiO2Photocatalysis·OHDeposition-precipitation method

万梦奇、文茜、慈梦怡、李汪阳、张镇

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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

TiO2 光催化 羟基自由基 沉积沉淀法

National Key Research and Development Program of ChinaNational Natural science Foundation of ChinaNational Natural science Foundation of ChinaUSTC Center for Micro and Nanoscale Research and Fabrication

2021YFA150040321773047U1832180

2024

10.1063/1674-0068/cjcp2305055

化学物理学报(英文版)
中国物理学会

化学物理学报(英文版)

CSTPCDEI
影响因子：0.162
ISSN：1674-0068
年,卷(期)：2024.37(4)