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以脲素作为前驱物,采用热聚合法制备薄层石墨相氮化碳(g-C_3N_4),然后在其表面原位合成层状碘氧化铋,构筑石墨相氮化碳-碘氧化铋层状异质结(g-C_3N_4/BiOI).合成样品的形貌、比表面积、晶体结构、分子结构、光吸收性能及其表面特性分别采用透射电镜、BET氮吸附、X射线粉末衍射、红外光谱仪、紫外可见漫反射和X射线光电子能谱分析进行表征,并考察合成的催化剂在可见光照射下光催化杀菌性能,研究中通过牺牲剂捕获的方法进一步揭示合成的g-C_3N_4/BiOI在杀菌过程中的机制.结果表明,合成的样品具有层状异质结结构,其比表面积为63 m~2·g~(-1),合成样品光吸收边可以达到600 nm.光催化活性测试表明g-C_3N_4/BiOI能够在4 h内将细菌杀死,其杀菌效果明显高于纯的g-C_3N_4和BiOI,其在光催化灭菌过程中主要的活性物种是光生空穴.
Using urea as a precursor, a thin layer of graphite carbon nitride (g-C_3N_4) was prepared by thermal polymerization. Then layered bismuth iodine oxide was synthesized in situ on its surface to form a graphite phase carbonitride-bismuth iodide oxide layer (G-C_3N_4 / BiOI). The morphology, specific surface area, crystal structure, molecular structure, optical absorption properties and surface properties of the synthesized samples were characterized by transmission electron microscopy, BET nitrogen adsorption, X-ray powder diffraction, infrared spectroscopy, UV-visible diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy were used to characterize the photocatalytic activity of the synthesized catalyst under visible light irradiation. The capture of the sacrificial agent was used to further reveal the biodegradability of the synthesized g-C_3N_4 / BiOI The results show that the synthesized samples have layered heterojunction structure with a specific surface area of 63 m 2 · g -1 and the light absorption edge of the synthesized sample can reach 600 nm.The photocatalytic activity of g-C_3N_4 / BiOI can kill bacteria within 4 h, its bactericidal effect is obviously higher than pure g-C_3N_4 and BiOI, its photocatalytic sterilization process is the main active species is photo-generated holes.