摘要
以乙酸锌为锌源,Na OH溶液作为沉淀剂,采用水热法结晶得到六方短棒状ZnO颗粒。再以化学氧化法制备的氧化石墨烯为改性剂,在ZnO颗粒合成过程中加入不同量的氧化石墨烯(GO)分散液。在水热条件下ZnO颗粒与氧化石墨烯片发生自组装形成ZnO/GO复合材料。通过X-射线衍射仪(XRD)、扫描电子显微镜(SEM)、傅里叶变换红外光谱(FT-IR)与紫外-可见漫反射光谱(DRS)对样品的物相组成、显微形貌、官能团特征及光学性质进行表征。在紫外光和可见光照条件下,分别研究了ZnO及不同GO含量的ZnO/GO复合材料对亚甲基蓝(MB)的光催化降解活性。结果表明:合成的ZnO为六方短棒状形貌,且GO的加入量对样品的形貌产生较大影响,同时GO可以有效促进光生电子和空穴的分离,所得ZnO/GO复合材料在紫外光光照条件下对MB具有良好的光催化降解性能,而在可见光光照下光催化活性很低,从而推测ZnO极性面与非极性面的暴露比例对复合样品的光响应范围及其光催化性能产生重要影响。
Zinc acetate as a zinc source, sodium hydroxide solution as a precipitating agent, hexagonal short rod-shaped ZnO particles were sythesized by hydrothermal crystallization. Graphene oxide prepared by chemical oxidation as a modifier, different amounts of graphene oxide (GO) solution were added during the synthesis of zinc oxide. ZnO/GO composites were gained by the self-assembly of ZnO particles and GO sheets under hydrothermal condition. The phase composition, micro-morphology, functional group characteristics and optical properties of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and ultraviolet-visible diffuse reflectance spectrum (DRS). The photocatalytic degradation activities of ZnO/GO composites with different GO contents for methylene blue (MB) were investigated under ultraviolet (UV) and visible light irradiation. The results show that the morphology of ZnO is hexagonal short rod-like, and the additive amount of GO has a significant influence on the morphology of sample. At the same time, GO can effectively promote the separation of photo-generated electrons and holes. As-prepared ZnO/GO composites have good degradation performance for MB under UV light irradiation. However, there is almost no photocatalytic activity under visible light, so it is inferred that the ratio of ZnO polarity surface to non-polar surface exposure has an important effect on the photoresponse range and photocatalytic performance of the composite sample.
作者
张迪
张江
李轩科
南辉
袁观明
董志军
丛野
李艳军
崔正威
ZHANG Di;ZHANG Jiang;LI Xuan-ke;NAN Hui;YUAN Guan-ming;DONG Zhi-jun;CONG Ye;LI Yan-jun;CUI Zheng-wei(The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;State Key Laboratory of New Ceramics and Fine Technology, School of Materials, Tsinghua University, Beijing 100084, China)
出处
《人工晶体学报》
EI
CAS
北大核心
2019年第4期572-578,共7页
Journal of Synthetic Crystals
基金
国家自然科学基金(51402221
51472186)
湖北省教育厅中青年人才资助项目(Q20151109)
关键词
六方短棒状ZnO
氧化石墨烯
水热法
光催化
亚甲基蓝
hexagonal short rod-like ZnO
graphene oxide
hydrothermal Method
photocatalysis
methylene blue
