摘要
采用共沉淀法合成纳米Fe_3O_4,将其作为非均相类Fenton反应催化剂,在紫外光辅助作用下,以氧化石墨烯为原料,制备石墨烯量子点。借助扫描电镜、紫外可见分光光度计和分子荧光光度计分别对Fe_3O_4纳米颗粒的形貌和产物的光谱特性进行表征。实验结果表明:在紫外光辐射作用下,类Fenton试剂产生的强氧化性的·OH与GO反应,从而形成GQDs;GO悬浮液pH值约4.0,满足Fenton反应的pH值条件,无需调节pH值,操作简便。此外,通过外加磁场容易分离产物,并且纳米Fe_3O_4可重复使用,能保持很好的活性。该实验有利于培养学生实践动手能力和科研能力,增强学生对非均相催化作用的认知及对Fenton反应和石墨烯量子点的光学性质的理解。
By adopting the co-precipitation method for the synthesis of nanometer Fe_3O_4,which is used as heterogeneous Fenton reaction catalysts,and with the auxiliary action of the ultraviolet light,the graphene quantum dots are prepared by using the graphene oxide as raw material.By means of the scanning electron microscope,ultraviolet visible spectrophotometer and fluorescence spectrometer,the morphology of Fe_3O_4 nanoparticles and the spectral properties of the products are characterized respectively.The experimental results show that the strong oxidizing intermediate OH which is generated from Fenton reagent under ultraviolet irradiation reacts with GO（graphene oxide）so as to form GQDs（grapheme quantum dots）.The GO suspension pH value is about 4.0,which meets the reaction conditions of the pH value.There is no need to adjust the pH value,and it is easy to operate.In addition,through the easy separation of products by an external magnetic field,the nano-Fe_3O_4 can be used repeatedly with good activity.It is beneficial to cultivate students＇ practical ability and scientific research ability,and enhance their cognition for heterogeneous catalysis and their understanding of Fenton reaction and optical properties of graphene quantum dots.
出处
《实验技术与管理》
CAS
北大核心
2017年第2期53-56,61,共5页
Experimental Technology and Management
基金
国家自然科学基金项目(21505095)
