摘要
以尿素和乙酸锌为前驱体,采用水热法制得不同ZnO含量的光催化复合材料石墨相氮化碳/氧化锌(g-C3N4/ZnO),采用TEM、XRD、UV-Vis、FT-IR、PL等分析方法对所得催化剂进行了表征和分析。结果表明,ZnO颗粒附着于多孔片层状的g-C3N4之上形成g-C3N4/ZnO复合材料,降低了g-C3N4的禁带宽度,增加了g-C3N4对可见光的吸收,以及光生电子-空穴对的分离几率。以可见光驱动亚甲基蓝的降解实验为探针反应检测催化剂的光催化性能,结果表明,质量比为3∶2的g-C3N4/ZnO复合材料表现最优光催化性能,其可在120min内降解92%的亚甲基蓝,其光催化降解速率为g-C3N4单体的2.8倍。
A series of g-C3N4/ZnO composites with various content of ZnO were prepared by hydrothermal method using urea and zinc acetate as precursors.The obtained catalysts were characterized by Transmission electron microscope(TEM),X-ray diffraction(XRD),ultraviolet-visible(UV-Vis)spectroscopy,Fourier transform infrared(FT-IR)spectroscopy,and photoluminescence(PL)spectrum.The results shows that the ZnO particles were attached to the g-C3N4 nanosheets with porous honeycombs to form g-C3N4/ZnO composites,resulting in the decrease of the band gap of g-C3N4,the increase of the visible light absorption of g-C3N4 and its electron/hole separation rate.The activities of the g-C3N4/ZnO catalysts were tested in the photocatalytic degradation of methylene blue under visible light.The results indicate that the g-C3N4/ZnO composite,of which the mass ratio between g-C 3N 4 and ZnO is 3∶2,exhibits the optimal photocatalytic efficiency,which can degrade 92%of methylene blue in 120 min.The rate constant for the catalyst is 2.8 times as high as that of pure g-C3N4.
作者
董曼茹
余欣佳
余健
林文松
DONG Man-ru;YU Xin-jia;YU Jian;LIN Wen-song(School of Materials Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)
出处
《人工晶体学报》
EI
CAS
北大核心
2019年第7期1314-1319,1349,共7页
Journal of Synthetic Crystals
基金
上海工程技术大学研究生科研创新项目(18KY0512)
关键词
石墨相氮化碳
氧化锌
光催化
亚甲基蓝
降解
graphitic carbon nitride
zinc oxide
photocatalysis
methylene blue
degradation
