GO负载Bi_(2)WO_(6)二元复合光催化材料的制备及其表征研究  

Preparation and characterization of GO load on Bi_(2)WO_(6)binary composite photocatalytic material

作　　者：于洋 刘东月 王淑 付立海 YU Yang;LIU Dong-yue;WANG Shu;FU Li-hai(College of Chemistry,Tonghua Normal University,Tonghua 134000,China)

机构地区：[1]通化师范学院化学学院,吉林通化134000

出　　处：《分子科学学报》2023年第2期165-172,共8页Journal of Molecular Science

基　　金：通化师范学院大学生创新创业训练计划项目(202010202032,S202110202048)。

摘　　要：本实验通过水热法合成不同比例的氧化石墨烯(GO)/Bi_(2)WO_(6)新型二元复合光催化材料.利用X射线衍射(XRD)、扫描电子显微镜(SEM)及透射电子显微镜等技术来研究样品的结构和形貌.在可见光下,4%GO/Bi_(2)WO_(6)复合材料光催化降解效率最好,达到了72%.本实验以石墨烯为碳源,制备出二元复合材料,将其引入光催化体系,提升半导体光催化材料对目标物的富集能力,为复合光催化材料的制备提供了新思路.以期获得高可见光催化活性的GO/Bi_(2)WO_(6)二元复合材料并将其应用于更多领域,同时对环境中的污染物也实现了高效、稳定的去除,为研究水体环境污染的治理奠定了一定的理论与实践基础.In this experiment,the Hummers method was used to synthesize graphene oxide(GO),and bismuth tungstate(Bi_(2)WO_(6))was synthesized by hydrothermal method and compounded with GO to prepare GO/Bi_(2)WO_(6)new binary composite photocatalytic materials with different ratios.Using X-ray diffraction(XRD),scanning electron microscope(SEM),transmission electron microscope(TEM)and other techniques to study the structure and morphology of the sample.The peak shape of the composite sample is very sharp,which proves that the sample has good crystallinity.The prepared graphene oxide sample has a thin layer structure,and Bi_(2)WO_(6)has a three-dimensional curd structure.The sample is evaluated by degrading tetracycline under visible light to evaluate its photocatalytic performance.This new photocatalyst was characterized and analyzed and the experiment was conducted to degrade tetracycline under visible light.To determine the optimal composite ratio.Under visible light,the 4%GO/Bi_(2)WO_(6)composite has the best photocatalytic degradation efficiency,reaching 72%.Compared with pure monomer materials,the photocatalytic effect has been greatly improved.The degradation effect is attributed to the good electronic conductivity of GO.It shows that the loading of an appropriate amount of GO can reduce the recombination rate of photogenerated electrons and holes pairs,because it prolongs the life of photogenerated electrons and promotes charge separation,thereby significantly improving the photocatalytic activity.By electron spin resonance(ESR)the spin-electron trapping experiment showed that·O_(2)^(-)and·OH radicals are the active species in the photocatalytic system,and photo-generated electrons can react with O_2 to produce active substances·O_(2)^(-).The compound reaction of·O_(2)^(-)and H~+further produces·OH.Both·O_(2)^(-)and·OH can oxidize TC,promote the improvement of photocatalytic effect and propose a reasonable photocatalytic reaction path.In this experiment,graphene was used as a carbon source to prepare a binary co

关 键 词：氧化石墨烯 钨酸铋 光催化降解 四环素 

分 类 号：O643[理学—物理化学]