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 KE Xu,WANG Sheng,HUANGFU Yan,et al.Photocatalytic hydrogen evolution over CaFe2O4/TiO2[J].Journal of NANJING TECH UNIVERSITY(NATURAL SCIENCE EDITION),2016,38(06):1-8.[doi:10.3969/j.issn.1671-7627.2016.06.001]





Photocatalytic hydrogen evolution over CaFe2O4/TiO2
1.南京工业大学 化工学院,江苏 南京 210009; 2.南京林业大学 理学院,江苏 南京 210037
KE Xu1 WANG Sheng1 HUANGFU Yan1 LIU Fusheng2 HU Hailong1 HUANG Jisen1
1.College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China; 2. College of Sciences, Nanjing Forestry University, Nanjing 210037, China
CaFe2O4 TiO2 光催化 制氢
CaFe2O4 TiO2 photocatalysis hydrogen production
本文制备了p-n复合半导体光催化剂CaFe2O4/TiO2,采用X线衍射仪(XRD)、扫描电子显微镜(SEM)、紫外-可见漫反射光谱仪(UV-Vis DRS)及电化学工作站对光催化剂的结构和性能进行表征。以模拟太阳光催化产氢速率评价p-n复合半导体光催化剂CaFe2O4/TiO2的光催化活性。探讨光催化剂中CaFe2O4添加量、甲醛浓度、反应体系pH对光催化产氢性能的影响,并对光催化活性的提高进行了机制分析。结果表明:CaFe2O4的导带比TiO2的导带更负,同时在CaFe2O4/TiO2内存在内建电场,两者均促进了电子从CaFe2O4向TiO2的迁移,增强了光催化活性,0.4%CaFe2O4/TiO2具有最高的光催化活性,2 h内的产氢速率达到0.989 mmol/(g·h)。此外,CaFe2O4/TiO2的稳定性较好,可多次循环使用。
A series of p-n coupled CaFe2O4/TiO2 photocatalysts were prepared. The structure and properties of CaFe2O4/TiO2 catalysts were characterized by X-ray diffraction(XRD), scanning electron microscope(SEM), ultraviolet-visible diffuse reflectance spectrum(UV-Vis DRS)and electrochemical tests. The photocatalytic activities of CaFe2O4/TiO2 catalysts were evaluated by photocatalytic hydrogen production under solar light. The effects of the amount of CaFe2O4, the concentration of HCHO and pH on hydrogen production were investigated. The mechanism of photocatalytic activity was discussed. Results showed that CaFe2O4/TiO2 exhibited higher photocatalytic activity attributed to electrons transferring from CaFe2O4 to TiO2, resulted from the more negative conduction band potential of CaFe2O4 than TiO2 and the inner electric field. 0.4%CaFe2O4/TiO2 had the best performance among the various CaFe2O4/TiO2 composite powders tested, with a hydrogen evolution rate of up to 0.989 mmol/(g·h)in 2 h, and CaFe2O4/TiO2 also exhibited the good stability with several recycling times.


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基金项目:国家自然科学基金(50876047); 江苏省普通高校研究生科研创新计划(SJLX-0342); 江苏高校品牌专业建设工程(PPZY2015A044)
作者简介:柯旭(1988—),男,湖北黄冈人,硕士,主要研究方向为功能材料; 王晟(联系人),副教授,E-mail: w_angsheng@njtech.edu.cn.
更新日期/Last Update: 2016-12-20