Research On The Preparation And Performance Of Composite Photocatalyst Based On Molybdenum Disulfide Modification

With the acceleration of industrialization,a large amount of waste water has been produced in the production and life of human beings.At present,there are mainly chemical method,physical method and biological method for the treatment of these waste water.Photocatalytic technology can adsorp the clean sunshine and the valence band is excited by the photon to induce the formation of electron-hole pairs.Electron-hole pairs will then form reactive superoxide radical and hydroxyl radical.Organic pollutants will react with reactive free radicals.Meanwhile,heavy metal will be reduced by electron.It is feasible to solve the problem of water pollution.However,photocatalysis technology has the problems of low utilization rate of sunlight and high photogenic electron hole recombination rate,which limit its treatment efficiency in practical application.In this research,Sb₂S₃,BiOI were synthesized and coupled with co-catalyst molybdenum disulphide to obtain two kinds of composite photocatalyst.Two composite photocatalyst show excellent degradation for Rh B by characterization of two composite photocatalyst and performance test,.Besides,MoS₂/BiOI composite photocatalyst also dealed with containing heavy metal Cr⁶⁺wastewater and exhibited good treatment.Compared with the monomer,composite photocatalyst showed the better performance of photocatalytic oxidation and reduction,improved the processing efficiency.In this research,MoS₂/Sb₂S₃ composite photocatalyst was synthesized via a two-step hydrothermal process flower Mo S₂/BiOI and MoS₂/BiOBr composite photocatalyst were synthesized via a simple coprecipitation method respectively.The prepared catalysts were characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,UV-Vis diffuse reflection（UV Vis）and photoelectron spectroscopy（XPS）.The photocatalytic mechanism was also explored.The photocatalytic properties were investigated by treating the Rh B simulated wastewater and other photocatalytic performance simulation wastewater,And the stability of its research and mechanism was determined.The results showed that compared with pure Sb₂S₃ and MoS₂,MoS₂/Sb₂S₃ composite photocatalyst show excellent adsorption performance and photocatalytic performance for degradation of rhodamine B.Meanwhile,MoS₂/Sb₂S₃ has better photocatalytic performance than P25,Bi₂S₃,C₃N₄,Sb₂S₃ and other catalysts under the same experimental conditions.REDOX properties of composite photocatalyst Mo S₂/BiOI were investigated by using 20 mg/L rhodamine B（RhB）and 10mg/L Cr⁶⁺solution as the target pollutant.Compared to the BiOI and MoS₂,MoS₂/BiOI composite photocatalyst showed stronger ability of photocatalytic oxidation and reduction.The photodegradation of RhB and Cr⁶⁺by BiOI loaded with 2wt%Mo S₂ exhibited the best photocatalytic performance.After 30 min under visible light,Degradation rate of RhB was 98.92%and 92.34%,respectively.After 80 min photocatalytic reduction rate of Cr⁶⁺solution can reach 97.87%and 80%respectively.compared with BiOI,MoS₂/BiOI were improved significantly.The kinetic analysis of the performance test shows that the removal reaction belongs to quasi-first-order kinetic reaction Furthermore,recycled ability and mechanism of the three kinds of composite photocatalyst were explored.MoS₂/BiOI composite photocatalyst has a certain application prospect.