Photocatalytic degradation of organic compounds in aqueous systems by Fe and Ho codoped TiO2

被引：18

作者：

Shi, J. ^{[1
]}

Zheng, J. ^{[1
]}

Hu, Y. ^{[1
]}

Zhao, Yu. ^{[1
]}

机构：

[1] China Univ Petr, State Key Lab Heavy Oil, Dongying 257061, Shandong, Peoples R China

来源：

KINETICS AND CATALYSIS | 2008年 / 49卷 / 02期

关键词：

D O I：

10.1134/S002315840802016X

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Undoped, single-doped, and codoped TiO2 nanoparticles were prepared by the sol-gel method and characterized with X-ray diffraction (XRD), the Brunauer-Emmett-Teller (BET)-specific surface area (S-BET), UV-Vis absorption spectra (UV-Vis), and X-ray photoelectron spectroscopy (XPS). Their photocatalytic activity was evaluated by methyl orange (MO) degradation in an aqueous suspension under UV or simulated solar light illumination. XRD showed that all samples calcined at 600 degrees C preserved the anatase structure, and doping inhibited the increase of crystallite size. The BET result revealed that doping improved the surface area of TiO2. UV-Vis indicated that Fe3+-doping broadened the absorption profile of TiO2. XPS demonstrated that doping was advantageous to absorb more surface hydroxyl groups or chemisorbed water molecules. Photocatalytic degradation showed that the photocatalytic activity of TiO2 codoped with Fe3+ and Ho3+ ions was markedly improved. This was ascribed to the fact that there was a cooperative action in the two doped elements. Fe3+-doping broadens the absorption profile, improves photo utilization of TiO2, and then generates more electronhole pairs. Ho3+-doping restrains the increase in grain size and retards the recombination of photo-generated electrons and holes.

引用

页码：279 / 284

页数：6

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