摘要
通过燃烧法和水热法制备了一种新型的S型异质结催化剂Bi_(2)O_(2)(OH)Cl/Bi/Bi_(2)O_(3)。采用X射线粉末衍射仪、扫描电子显微镜、X射线光电子能谱和紫外可见漫反射光谱对所得样品进行了表征和测试。通过光催化实验和光电化学测试,表征了样品的光催化合成H_(2)O_(2)性能,提出了光催化反应机理。结果表明随着水热温度的升高,样品中Bi_(2)O_(2)(OH)Cl的含量越高,当水热温度为120℃时,复合材料表现出最佳的光催化活性。在模拟太阳光照射下,H_(2)O_(2)的生成效率达到571.43μmol·h^(-1)·g^(-1),分别是Bi/Bi_(2)O_(3)和Bi_(2)O_(2)(OH)Cl的47.8倍和3.6倍。其高效的光催化性能归因于复合材料中异质结界面电场的形成,提高了光生电子-空穴的分离效率。自由基淬灭实验表明Bi_(2)O_(2)(OH)Cl/Bi/Bi_(2)O_(3)光催化生成H_(2)O_(2)反应的主要活性物种为超氧自由基和单线态氧。
A new S-type heterojunction catalyst Bi_(2)O_(2)(OH)Cl/Bi/Bi_(2)O_(3) was prepared by combustion and hydrothermal methods.The samples were characterized by X-ray powder diffractometer,scanning electron microscopy,X-ray photoelectron spectroscopy and UV visible diffuse reflectance spectra.The photocatalytic synthesis of H_(2)O_(2) for the sasmples was investigated by photocatalytic experiments and photoelectrochemical tests,and the photocatalytic reaction mechanism was speculated.The results show that the content of Bi_(2)O_(2)(OH)Cl increases with the increase[JP3]of synthesis temperature,and the composite Bi_(2)O_(2)(OH)Cl/Bi/Bi_(2)O_(3) exhibits the best photocatalytic activity when the hydrothermal temperature is 120℃.The H_(2)O_(2) production rate under simulated sunlight irradiation is up to 571.43μmol·h^(-1)·g^(-1),which is 47.8 and 3.6 times of Bi/Bi_(2)O_(3) and Bi_(2)O_(2)(OH)Cl,respectively.Its high photocatalytic performance can be attributed to the formation of interfacial electric field of heterojunction in the composite,which improves the separation efficiency of photogenerated electron-hole.Radical quenching experiments show that the main active species of photocatalyzed H_(2)O_(2) for Bi_(2)O_(2)(OH)Cl/Bi/Bi_(2)O_(3) are superoxide free radicals and singlet oxygen.
作者
高美超
孙兆楠
巩云云
于光龙
冯媛媛
GAO Meichao;SUN Zhaonan;GONG Yunyun;YU Guanglong;FENG Yuanyuan(School of Chemistry and Chemical Engineering,Qufu Normal University,Qufu 273165,China;Liaocheng Luxi Polyol New Material Technology Co.,Ltd.,Liaocheng 25200,China)
出处
《聊城大学学报（自然科学版）》
2024年第6期39-48,共10页
Journal of Liaocheng University:Natural Science Edition
基金
国家自然科学基金项目(22072070)
山东省自然科学基金项目(ZR2021QE032)资助。
