Study On Preparation,Characterization And Photocatalytic Activity Of Oxide/Silver Orthophosphate(Silver Halide) Nanocomposite Particles

The article main research content which is trace oxide to modification of Ag3PO4?AgX?visible light catalyst.Composite particles were analyzed with different means of characterization.With methyl orange as model pollutant to investigate photocatalytic activity and stability of the particles.By the experiment of adding capture agent,analyzing the active centre of photocatalytic degradation of composites for Methyl orange,and discussing the visible-light photocatalytic mechanism.The first part of the article analyze TiO₂ modified Ag₃PO₄ visible light catalyst.Firstly,The surface of Ag3PO4 adsorb TiO2 sol,then the trace of TiO2 modified Ag3PO4composite particles were preparated by temperature programmed.The TiO₂/Ag₃PO₄ was characterized by X-ray diffraction,X-ray photoelectron spectroscopy,scanning electron microscopy,UV-vis diffuse reflection spectroscopy,and electrochemical impedance spectroscopy.The results showed TiO2/Ag3PO4 composite particles could obviously increase absorption of visible light and electron hole separation efficiency.Photocatalytic activity experiments show that the surface-modified Ag3PO4 possesses much higher visible-light photocatalytic activity and stability than pure Ag3PO4.The degradation rate of methyl orange was 3.43 times of pure Ag3PO4.By the experiment of adding capture agent,analyzing the active centre of photocatalytic degradation of composites for Methyl orange,and discussing the visible-light photocatalytic mechanism.Capturing agent experiment shows that the hole is main active species in the process of photocatalytic degradation.The second part of the article analyze Fe₂O₃ modified Ag₃PO₄ visible light catalyst.Firstly,The surface of Ag3PO4 adsorb Fe?NO3?3 solution,then the trace of Fe2O3 modified Ag3PO4 composite particles were preparated by high temperature calcination.The Fe2O3/Ag3PO4 was characterized by XRD,XPS,SEM,UV-vis DRS,EIS and PL.The results showed Fe2O3/Ag3PO4 composite particles could obviously increase absorption of visible light and electron hole separation efficiency.Photocatalytic activity experiments show that the surface-modified Ag3PO4 possesses much higher visible-light photocatalytic activity than pure Ag3PO4.The third part of the article analyze Fe2O3 modified AgBr visible light catalyst.Firstly,The surface of AgBr adsorb FeCl₃ solution,then the trace of Fe₂O₃ modified AgBr composite particles were preparated by high temperature calcination.The Fe2O3/AgBr was characterized by XRD,XPS,SEM,UV-vis DRS,EIS,PL and photoelectric current.The results showed Fe2O3/AgBr composite particles could obviously increase absorption of visible light and electron hole separation efficiency.Photocatalytic activity experiments show that the surface-modified AgBr possesses much higher visible-light photocatalytic activity and stability than pure AgBr.By the experiment of adding capture agent,analyzing the active centre of photocatalytic degradation of composites for Methyl orange,and discussing the visible-light photocatalytic mechanism.