Preparation,Characterization And Photo-Fenton Catalytic Properties Of Carbon-based Magnetic Nanomaterials

With rapid development of science and technology,the seriousness of the environmental problems arising from the tremendous development of industry has become increasingly prominent.For example,the production of textiles,printing,and leather products requires the use of large amounts of dyes,and some of these dyes were mixed into the waste liquid during the production process and discharged.These dyes are difficult to remove,and its toxicity and carcinogenicity are the serious threat to human and animal life and health.The traditional waste water treatment method,which is represented by homogeneous Fenton reaction,has the disadvantages of difficulty in separating and large energy consumption.Although Fe₃O₄-based heterogeneous Fenton oxidation can effectively solve the problems of difficulty in separation and secondary pollution for excellent magnetic properties of Fe₃O₄.There are still some defects like low catalytic efficiency and narrow pH application range etc,due to the singularity of the material.At the same time,a large number of bacterias and other microorganisms in sewage will become the medium of the disease.This problem has not been properly resolved by the traditional water treatment methods.It was found that the non-homogeneous Photo-Fenton reaction with carbon-based antimicrobial nanomaterial as catalyst can not only eliminate the organic pollution in the waste liquid to prevent secondary pollution,but also has low energy consumption and a wide range of pH.Meanwhile,it also can inhibit the growth of various types of bacterias in the water.It has a good application prospect and a high application value.In addition,the environmental problems arising from the use of the catalyst have been effectively solved.The environmental pollution caused by using of toxic reagents during the synthesis of the catalyst cannot be ignored.In this experiment,an environmentally friendly method was selected using biological macromolecule sodium alginate as the reducing agent and water as the solvent to prepare a variety of magnetic carbon antibacterial nanomaterials.These materials not only have good antibacterial effect,but also can efficiently degrade contaminants in a photocatalytic environment.This is also very consistent with the core concept of the green chemistry which is avoiding pollution from the source.This paper is composed of four parts:Part 1: The research status and development prospect of green synthetic nanomaterials are reviewedand summarized.The biosynthesis and green technology were introduced emphatically.Part 2: In this paper,a green one step synthesis method was designed.The Fe₃O₄ nanoparticles with an average particle size of 7 nm were successfully prepared by using water as the solvent and sodium alginate as the reducing agent.Then it was loaded on the graphene uniformly.This method has not been reported in the literature.The RGO/Fe₃O₄ samples were characterized by X-ray diffraction?XRD?,vibrating sample magnetometer?VSM?,fourier transform infrared?FT-IR?,nitrogen adsorption-desorption isotherms?BET?,field emission scanning electron microscope?FESEM?and so on.Also,its catalytic performance in Photo-Fenton system was studied.Part 3: RGO/Fe₃O₄/Ag was prepared by hydrothermal method,using sodium alginate as the reducing agent and water as the solvent.The RGO/Fe₃O₄/Ag samples were characterized by XRD,VSM,FT-IR,FESEM and so on.Moreover,this material showed good antibacterial properties in antibacterial experiments and good catalytic activity in the degradation in Photo-Fenton system.Part 4: MWCNTs/Fe₃O₄/Ag was prepared by hydrothermal method,using sodium alginate as the reducing agent and water as the solvent.The MWCNTs/Fe₃O₄/Ag samples were characterized by XRD,VSM,FT-IR,FESEM and so on.This material also showed good antibacterial properties and good catalytic activity in Photo-Fenton system.