Photocatalytic reduction of CO2 over Sm-doped TiO2 nanoparticles

作者：Hao Peng,Ruitang Guo,He Lin

摘要：Highly efficient photocatalytic reduction of CO2 is essential for solving the greenhouse effect and energy crisis.In this paper,the Sm-TiO2 nanocomposites were successfully prepared via sol-gel method.The CO2 photoreduction activities of synthesized samples were tested under irradiation for 6 h and the results indicate that the 0.5% Sm-TiO2 catalyst has superior performance and stability.The CO and CH4 yields of0.5% Sm-TiO2 catalyst are 55.47 and 3.82 μmol/g·cat respectively,which are 5.02 and 2.67 times the yield of TiO2.The possible mechanism of Sm doped TiO2 was investigated through comprehensive characterization and photoetectrochemical analysis,After the Sm doping,the photo-generated electrons in TiO2 could migrate to Sm 4 f,and some of them can be captured by reducing Sm3+ o Sm2+,which can lower the recombination rate of electron and hole pairs.Therefore,the enhanced photocatalytic performance could be ascribed to large specific surface area,fast separation rate of electron-hole pairs and high visible light response.This report provides some meaningful attempts in researching the CO2 photocatalytic reduction.

发文机构：School of Mechanical and Power Engineering College of Energy and Mechanical Engineering Shanghai Engineering Research Center of Power Generation Environment Protection Shanghai Institute of Pollution Control and Ecological Security

关键词：PHOTOCATALYSTSm-TiO2CO2reductionElectron-holepairsRareearths

分类号： O64[理学—物理化学]