Synthesis And Photocatalytic Properties Of Cu?Mndoped ZnS Composites Material

With the progress of technology and the development of human society,theenergy are running out,the environmental pollution is becoming a sirious threat to the survival of human beings.Therefore,the developments of clean energy and efficient catalysts would be inevitable to solve energy and environmental problems by photocatalytic technology.As a typical wide band gap II-VI compound semiconductormaterials,many researchers has strong interest on ZnS,because of its uniquecharacteristics of photoelectricity.However,the wide band gap can only be excited by UV light with wavelength less than 367 nm,which limits its wide application in the field of photocatalysis.In order to increase the utilization rate of ZnS to light,the researchers have modified the ZnS,doped Metal ion or nonmetal ion;Reunite with Polymer;and Reunite with Semiconductor.According to literature reports,the optical performance of ZnS can improved effectively with the dopping of transition metal,and prepared easily,in which Cu?Mn has a lot of focus,but the study pay a lot of attention to the fluorescence properties of ZnS,less studies on Photocatalytic Performance.Therefore,in this paper,the effect of photocatalytic activity of ZnS doped with transition metal ions Mn and Cu was studied systematically.And the basis of this,we also prepared the core-shell nanostructures ZnS doped with Mn,and investigated their photocatalytic activity.And the material of microstructure,surface morphology andphotocatalytic properties were studied by XRD,SEM,TEM,XPS and UV-visible spectroscopy testing means.In this paper,the good crystallization,small particles uniformly distributed Cu/Mn doped ZnS powders were synthesized by hydrothermal and with Zinc acetate,Manganese acetate,Cupric acetate and thiourea as the raw material,discussed thedifferent elementandamount of metal doping affecting on the ZnS structure,morphology and photocatalytic properties.The effects of reaction temperature,reaction time and the ratio of Zn/S on the photocatalytic activity of ZnS were investigated by the photocatalytic activity.The results showed that ZnS has the highest photocatalytic activity at the reaction temperature of 80?,reaction time of 6h and the ratio of Zn/S of 1:1.Microstructure analysis showed that ZnS crystal growth had existing orientation and uneven particle size,there were a lot of agglomerations.The growth characteristics and surface morphology of the grain were changed by doping with Cu/Mn element,the simples have single dispersion,particle distribution and theaverage particle size was 2nm.Highresolution transmission electron microscopy analysis showed thatstructureof ZnS QDs werepolycrystalline.UV-visible spectroscopy showed that Cu/Mn doped ZnS powder hadred shift of absorption edge to achieve light response,so that its photocatalytic degradation of methyl orangesolution were farsuperior to pure ZnS powder.After 60 min light exposure by 175 W mercury lamp,thephotocatalytic degradation efficiency was 100% with 2%Mn doped ZnS,98% with 2%Cu doped ZnS,99% with Cu?Mn co doping ZnS,while the pure ZnS powder onlybeen 90%.In addition,Zinc acetate,Manganese acetate,and thioacetamide as the rawmaterial,synthesizethe good crystallization,particles uniformly distributed C@ZnS:Mn nanosphereby hydrothermal,discussed the different elementandamount of metal doping affecting on the ZnS structure,morphology and photocatalytic properties.The effects of reaction temperature,reaction timeon the photocatalytic activity of ZnS were investigated by the photocatalytic activity.The results showed that ZnS had the higher photocatalytic activity at the reaction temperature of 200?,reaction time of 18 h.Microstructure analysis showed that,the simples have single dispersion,particle distribution and the average particle size was 500 nm.High-resolution transmission electron microscopy analysis showed thatstructureof C@ZnS:Mn wrepolycrystalline.UV-visible spectroscopy showed that C@ZnS:Mn doped ZnS powder has red shift of absorption edge to achieve light response,so that its photocatalytic degradation of methyl orange solution is far superior to pure ZnS powder.After 60 min light exposure by mercury lamp,the photocatalytic degradation efficiency was 100% of C@ZnS:Mn,while the pure ZnS powder only been 90%.