Synthesis Of One-dimensional Gallium Based Nanomaterials By Electrospinning And Their Photocatalytic And Luminescent Properties

With the decrease of fossil fuels and the increasingly serious environmental pollution,the photocatalytic technology has shown a great potential in environmental governance and energy shortage.Because of the mild reaction conditions,no secondary pollution and the use of natural sun light,photocatalytic technology has become a hot topic in the field of environmental research.Gallium based nanomaterials,as a significant semiconductor material,have potential application in the fields of photocatalytic and photoluminescence.Different morphology of gallium based nanomaterials such as cuboid,globular,ribbon and flocculation can be obtained by using different methods,which show the uneven photocatalytic and photoluminescence performance because of the different surface states,lattice defects,light absorption properties and so on.One-dimensional nanomaterials have special photocatalytic and optical properties and have been favored by researchers in recent years due to its large aspect ratio and high specific surface are.In this study,electrospinning technology was adopted to fabricate one-dimensional gallium based nanomaterials.The obtained gallium based nanomaterials were characterized by means of XRD,SEM,(HR)TEM,EDS,BET,PL,DRS,FT-IR,electrochemical method and so on.Their application in the fields of photocatalysis and photoluminescence were studied.The results were given as follows:Gallium nitrate was selected as the source of Ga2O3.Polyacrylonitrile(PAN,Mw=150000)was selected as the polymer template.N,N-dimethylformamide was selected as the solvent.Precursor with different polymer concentration was prepared to investigate the effect of different concentrations of polymer solution on the morphology of electrospun fibers and then the optimal concentration of polymer precursor was selected.The precursor composite fibers were pre-oxidized at different temperatures to abtain the best pre-oxidation condition.The monoclinic Ga2O3 abtained by calcination at high temperatures after pre-oxidation treatment,which showed a good fiber morphology.Under ultraviolet light,it had the properties of degrading tetracycline hydrochloride and water-splitting for H2 production.Gallium nitrate and zinc nitrate were selected as the source of ZnGa2O4.Polyacrylonitrile(PAN,Mw=150000)was selected as the polymer template.N,N-dimethylformamide was selected as the solvent.The cubic ZnGa2O4 with a good fiber morphology can be obtained by being calcined after pre-oxidation treatment.The crystal phase and morphology of ZnGa2O4 nanofibers were not affected by the ratio of nzn/nGa.Under ultraviolet light,it had the properties of the degradation of tetracycline hydrochloride and water-splitting for H2 production.The ratio of nzn/nGa had a great influence on photocatalytic performance.Ga2O3:Eu3+and ZnGa2O4:Eu3+nanofibers were prepared and Eu3+doping can not change the crystal phase and morphology of Ga2O3 and ZnGa2O4.The photocatalytic activity of Ga2O3:Eu3+ and ZnGa2O4:Eu3+ nanofibers were lower than that of Ga2O3 and ZnGa2O4 nanofibers.The photoluminescence emission spectrum showed that Ga2O3:Eu3+and ZnGa2O4:Eu3+ nanofibers appeared a red emission peak at 612nm.The relationship between photocatalytic activity and luminescent properties had been discussed.It was believed that the doped Eu3+ formed luminescent centers which reduce the photocatalytic activity of Ga2O3 and ZnGa2O4.Gallium nitrate and zinc nitrate were selected as the source of GaN:ZnO solid solution.Polyacrylonitrile(PAN,Mw=150000)was selected as the polymer template.N,N-dimethylformamide was selected as the solvent.The rodlike GaN:ZnO solid solutions were obtained by being calcined in ammonia atmosphere which could obsorb visible light effectively.GaN:ZnO solid solution loaded with Rh2-yCryO3 cocatalyst had the ability of water-splitting for H2 production under visible light.