铂离子掺杂TiO_2光催化还原CO_2  

Photocatalytic Reduction of CO_2 over Platinum-Ion-Doped Titania

作　　者：温智勇 湛志刚 邓剑华 冯永新 雷泽 熊卓[2] 赵永椿[2] 张军营[2] 

机构地区：[1]广东电网有限责任公司电力科学研究院,广州510080 [2]华中科技大学能源与动力工程学院煤燃烧国家重点实验室,武汉430074

出　　处：《新能源进展》2017年第5期352-357,共6页Advances in New and Renewable Energy

基　　金：国家自然科学基金项目(U1610110;51706082);湖北省对外科技合作项目(2016AHB021)

摘　　要：本文利用溶胶凝胶法制备不同Pt掺杂量的纳米TiO_2光催化剂(Pt/TiO_2),使用X射线衍射仪、透射电镜、紫外可见漫反射光谱和光致发光光谱对其进行表征,并在紫外光与可见光下进行了CO_2光催化还原实验。实验结果表明,Pt离子掺杂TiO_2纳米催化剂颗粒排列紧密,大小分布均匀,平均粒径约为20 nm。Pt/TiO_2催化剂在紫外光及可见光下均表现出较高的光催化活性。紫外光下,Pt掺杂量为0.2wt%的催化剂活性最高,其甲烷产率可达66μmol gcat^(-1)·h^(-1);可见光下0.3wt%Pt/TiO_2活性最优,这是由于铂离子掺杂能有效地将TiO_2光响应范围拓展至可见光区,并可抑制光生电子空穴对的复合。Platinum-ion-doped titania （Pt/TiO2） nanoparticles with varied doping concentration were synthesized by sol-gel method, and characterized by X-ray diffraction （XRD）, transmission electron microscope （TEM）, UV-Vis diffuse reflectance spectroscopy （UV-Vis） and photoluminescence （PL） spectroscopy. The photocatalytic reduction experiment of CO2 was carried out under UV/visible light irradiation. Results showed that the Pt/TiO2 nanoparticles were arranged closely and uniform-sized, the mean diameter was about 20 nm. CH4 was found to be the primary product for Pt/TiO2 catalysts. The 0.2wt% Pt/TiO2 catalyst showed the best photocatalytic activity with a maximum CH4 production rate of 66 μmol gcat^-1·h^-1 under UV light irradiation. The activity of 0.3wt%Pt/TiO2 catalyst was highest under visible light irradiation. This is attributed to the doping of Pt ion can effectively extend the spectral response from UV to visible area and slow the recombination of photogenerated electron-hole pairs.

关 键 词：铂离子 掺杂 TIO2 二氧化碳 光催化还原 

分 类 号：TK511.4[动力工程及工程热物理—热能工程] TQ032.4[化学工程]