构建MoS2/Fe-g-C3N4异质结催化剂以促进其可见光催化产氢性能  

Fabrication of MoS2/Fe-g-C3N4 Heterojunction Composites with Enhanced Hydrogen Evolution Activity under Visible Light Irradiation

作　　者：田少鹏[1] 王鹏 任花萍[1] 朱敏[1] 苗宗成[1] TIAN Shao-peng;WANG Peng;REN Hua-ping;ZHU Min;MIAO Zong-cheng(School of Science,Xijing University,Xi'an 710000,Shaanxi,China;School of Chemistry and Chemical Engineering,Xuzhou Institute of Technology,Xuzhou 221018,Jiangsu,China)

机构地区：[1]西京学院理学院,陕西西安710000 [2]徐州工程学院化学化工学院,江苏徐州221018

出　　处：《精细化工》2019年第12期2431-2437,2446,共8页Fine Chemicals

基　　金：国家自然科学基金(21706218);陕西省教育厅专项科研计划(18Jk1205);西京学院高层次人才启动项目(XJ17B02)

摘　　要：以g-C3N4为基底,通过掺杂Fe元素,复合MoS2的方法制备了具有多孔异质结结构的MoS2/Fe-g-C3N4半导体材料,并测量了其光解水产氢性能,发现MoS2含量为3%(以g-C3N4的质量为基准,下同)时,MoS2/Fe-g-C3N4的光催化性能优异,其产氢速率达到48.2μmol/h,为g-C3N4的5.48倍。利用XRD、FTIR、SEM、TEM、XPS表征了催化剂的物化性质;利用PL、UV-Vis等方法表征了催化剂的光学性质。结果发现,Fe元素的掺杂使g-C3N4结晶度降低,并呈现一种交叉孔道结构,极大增加了催化剂的比表面积。同时,MoS2可以与g-C3N4形成异质结结构,提高了MoS2/Fe-g-C3N4的可见光吸收率以及光生电子-空穴对的分离效率,从而有效提高了MoS2/Fe-g-C3N4光解水产氢的能力。A series of porous MoS2/Fe-g-C3N4 heterojunction composites were fabricated and their catalytic performances for hydrogen evolution via water splitting under visible light irradiation were measured.The results showed that when the mass fraction of MoS2 was 3%(based on the mass of g-C3N4,the same below),the prepared 3%MoS2/Fe-g-C3N4 exhibited excellent photocatalytic performance.Its rate of hydrogen production reached 48.2μmol/h,which was 5.48 times of that of pure g-C3N4.The physicochemical properties of materials were investigated by XRD,FTIR,SEM,TEM and XPS and the optical properties were tested by PL and UV-Vis.The results revealed that the Fe dopant decreased the crystallinity of g-C3N4.The Fe-g-C3N4 material presented a porous structure with larger specific surface area.Furthermore,MoS2 could form heterojunction structure with g-C3N4,which improved the visible absorption of MoS2/Fe-g-C3N4 and the separation efficiency of photogenerated electron-hole pair,so as to effectively enhance the photocatalytic hydrogen evolution of MoS2/Fe-g-C3N4.

关 键 词：MoS2/Fe-g-C3N4 光催化产氢 异质结结构 多孔结构 可见光 催化技术 

分 类 号：O643.36[理学—物理化学]