Research On Preparation,adsorption And Photocatalytic Properties Of MoO₃ Composites

In recent years,the rapid development of industry has led to a series of serious environmental problems and ecological crises.Especially in the printing and dyeing,textile and coating industries,a large number of organic dye waste water discharged annually,has posed a serious threat to the water environment safety in China.The adsorption of nanomaterials and photocatalytic oxidation degradation have many advantages in the field of dye wastewater treatment,which has become a hot topic in this field.Nanoadsorbents usually have a specific surface area that is far larger than that of the homograft materials,and the number of adsorption sites is huge and usually has excellent adsorption effect.Photocatalytic oxidation technology is a clean and sustainable pollution treatment technology.The semiconductor catalyst absorbs solar energy and generates electrons and holes to generate corresponding free radicals in water,so as to achieve the degradation of dye molecules.The photocatalytic activity of single-phase semiconductor materials is usually poor.Therefore,people often prepare composite catalysts to enhance their photocatalytic activity and improve the stability of the catalysts.In this paper,MoO₃ nanobelts were used as reaction raw materials,and nano flower MoS₂,MoO₂/MoO₃ composite catalysts and MoS₂/MoO₃ composite catalysts were prepared by simple hydrothermal method.By XRD,SEM,TEM,PL,EIS and other test and characterization methods of sample optical,electrochemical and surface morphology were analyzed on nano anthoid MoS₂ on Adsorption Properties of organic dyes and MoO₂/MoO₃ composite catalyst,MoS₂/MoO₃ catalyst under visible light irradiation on the photocatalytic properties of organic dyes.The main contents and achievements of this paper are as follows:?1?using KSCN as a reducing agent,MoO₃ will be completely reduced to MoS₂ by hydrothermal method.The nano flower like MoS₂ has a good effect on the adsorption of RhB dye molecules,the maximum adsorption capacity was 235.25 mg/g and the adsorption process follows the Langmuir isothermal adsorption model and pseudo two order kinetics model.?2?using KSCN as reducing agent and partial reduction of MoO₃ by hydrothermal reaction,the MoO₂/MoO₃ composite catalyst showed excellent photocatalytic degradation effect on RhB and other organic dyes with photosensitizing effect.In the composite catalyst,the load of MoO₂ has significant influence on the photocatalytic activity,and the photocatalytic activity of 10:1 MoO₂/MoO₃ composite catalyst is the highest.?3?MoS₂/MoO₃ composite catalyst has the visible light photocatalytic activity that pure MoO₃and pure MoS₂ do not possess.MoS₂ loading effectively enhances the absorption of visible light by composite catalyst.The load of MoS₂ has the best value,too much or too little is beneficial to the maximization of the photocatalytic activity.H₂O₂ can effectively accelerate the photocatalytic reaction of the composite catalyst for the degradation of RhB.