摘要
利用超声-水热法、使用油酸钠辅助合成钨酸铋(Bi2WO6)量子点/纳米片修饰的石墨相氮化碳(g-C3N4)(Bi2WO6/g-C3N4)复合光催化剂。通过X射线粉末衍射(XRD)、透射电子显微镜(TEM)、傅里叶变换红外光谱(FT-IR)、紫外可见漫反射光谱(UV-Vis DRS)、N2吸附-脱附等技术手段获得Bi2WO6/g-C3N4催化剂的组成、结构和光吸收性能,分析合成机理。以罗丹明B(RhB)水溶液为模拟污染物,考察Bi2WO6/g-C3N4复合催化剂的可见光催化活性。结果表明:g-C3N4和Bi2WO6的质量比为3∶7的Bi2WO6/g-C3N4-30具有最有效的异质界面,电化学阻抗和光电流测试结果显示该催化剂的光生载流子传输速率快、复合率低,可见光照射120 min对RhB的降解率达到95.8%;通过活性物质捕捉实验获知光生空穴是光催化反应中的主要活性物质,分析异质界面对光催化活性的影响,进而提出光催化反应机理。
Bismuth tungstate/graphitic carbon nitride(Bi2WO6/g-C3N4)composite photocatalyst modified by Bi2WO6 quantum dots and nanosheets was prepared through ultrasonic-hydrothermal method using sodium oleate as auxiliary reagent.The compositions,structures and light absorption properties of Bi2WO6/g-C3N4 were characterized by X-ray powder diffraction(XRD),transmission electron microscopy(TEM),Fourier transform infrared spectra(FT-IR),ultraviolet-visible diffuse reflectance spectroscopy(UV-Vis DRS),Brunauer-Emmett-Teller(BET)and other techniques.The mechanism of synthetic reaction was proposed.Photocatalytic reduction of aqueous rhodamine B(RhB)was employed to assess the visible light photocatalytic activity of Bi2WO6/g-C3N4.Electrochemical impedance spectroscopy(EIS)and photocurrent characteriations demonstated that Bi2WO6/g-C3N4 with the heterogeneous interface separated the photo-generated electron-hole paris effectively.Hence,a rapid RhB degradation by Bi2WO6/g-C3N4-30(the number 30 represents the mass fraction(%)of g-C3N4)under visible light irradiation was achieved at 95.8% in 120 min.The results confirmed that the photogenerated holes were main active specie in the photodegradation process.Moreover,the relationship of heterogenrous interface and photocatalytic performance was investigated,and involved photocatalytic mechanism was revealed.
作者
李靖
吴海波
王瑜
杨华美
宋明
堵锡华
张永才
LI Jing;WU Haibo;WANG Yu;YANG Huamei;SONG Ming;DU Xihua;ZHANG Yongcai(School of Chemistry and Chemical Engineering,Xuzhou University of Technology,Xuzhou,Jiangsu 221111,China;School of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou,Jiangsu 225009,China)
出处
《应用化学》
CAS
CSCD
北大核心
2019年第11期1275-1285,共11页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金(21703194)
江苏省自然科学基金(BK20171168,BK20171169)
江苏省高校自然科学基金重大项目(18KJA430015)
江苏省高校青蓝工程优秀青年骨干教师(2018)项目资助~~
关键词
表面修饰
钨酸铋/石墨相氮化碳复合催化剂
可见光催化
合成反应和光催化反应的机理
surface modification
bismuth tungstate/graphitic carbon nitride composite catalyst
visible light photocatalysis
mechanism of synthesis reaction and photocatalytic reaction
作者简介
通讯联系人:李靖,副教授,Tel/Fax:0516-85608300,E-mail:lijingxz111@163.com,研究方向:无机纳米材料的合成和光催化;共同通讯联系人:张永才,副教授,Tel/Fax:0514-87975244,E-mail:zhangyc@yzu.edu.cn,研究方向:无机纳米材料的合成和光催化。
