Preparation Of Nano-ZnS-based Photocatalyst And Its Application In Marine Diesel Pollution Treatment

In recent years,with the development of human activities,marine pollution is becoming more and more serious.In the treatment of water pollution,the unique advantages of various semiconductor photocatalytic materials with nano ZnS photocatalyst which due to their unique optical properties and electrical properties have received considerable attention and become one of the popular research fields,used in various related fields.The photocatalytic properties of semiconductor photocatalytic materials with nano ZnS photocatalyst,the UV light conditions can be effective in degradation of pollutants in seawater,can the organic contaminant molecules into inorganic small molecules,low energy consumption,high degradation rate,and will not bring pollution two.In this paper,ZnS based photocatalyst is used to photocatalytic degradation of marine diesel pollution,and good results have been achieved.Five different factors were investigated:the dosage of photocatalyst,the initial concentration of diesel oil,the concentration of H₂O₂ solution,the pH value of seawater and the time of UV irradiation on the efficiency of reaction degradation.In order to further improve the removal efficiency,nano ZnS photocatalyst was modified to make ZnS and CuS composite,and nano CuS/ZnS composite photocatalyst was prepared.And in consideration of the practical application effect,the polypropylene multi ball loaded nano CuS/ZnS photocatalyst was prepared.Better results have been achieved.The main results of this paper are as follows:?1?The preparation of nanometer ZnS photocatalyst adopts chemical precipitation method.Through chemical precipitation method,the experimental results show that nanometer ZnS particle size administered approximately 50 nm,is a relatively even distribution of crystal film,under the condition of uv light can carry on the degradation of diesel in the sea water pollutants.The optimization of experimental conditions were determined as follows:the nanometer ZnS light catalyst dosing quantity for 40 mg administered,diesel initial concentration is 0.1 g/L,H2O2 solution concentration is 0.3 g/L,the pH value of 7 water,ultraviolet light time is 2.5 hours,as the highest removal rate of diesel oil in water,can reach91.05%.?2?The preparation of nano CuS/ZnS composite photocatalyst is based on chemical precipitation and ion exchange.The experimental results show that the particle size of the nanocus/ZnS composite photocatalyst obtained by the experimental method is about 30-50nm,which is irregular and multilateral.The diesel pollutants in seawater can be degraded by ultraviolet light.Optimization of experimental conditions were determined as follows:nano CuS/ZnS composite photocatalyst dosing quantity is 50 mg administered,diesel initial concentration is 0.2 g/L,concentration of H₂O₂ solution is 0.3 g/L,the pH value of water 8,ultraviolet illumination time is 2 hour,as the highest removal rate of diesel oil in water,can reach 97.58%.?3?The nano CuS/ZnS composite photocatalyst was loaded on polypropylene polyhedron by using titanate coupling agent,and the polypropylene multi-surface ball loaded nano CuS/ZnS photocatalyst was prepared.The experimental results show that:the preparation of polypropylene polyhedral ball load type nano CuS/ZnS photocatalyst administered load time,uniform film layer,and through the experiment many times found that the membrane layer in seawater would not easily broken.Optimized experimental conditions were determined as follows:nano CuS/ZnS composite photocatalyst administered load is 0.2 g,diesel initial concentration is 0.1 g/L,H₂O₂ solution concentration is 0.3 g/L,ultraviolet light time is 1.5hours,as the highest removal rate of diesel oil in water,can reach 98.5%.