Preparation Of Bismuth Chloride By Solution Combustion And Its Application In Degradation Of Organic Pollutants

As an environmental protection treatment science and technology,photocatalytic technology decomposes organic pollutants into non-toxic inorganic small molecules such as CO2 and H2O.Solar energy is the richest and cheapest resource in nature.We can make full use of solar energy by using sunlight to degrade organic pollutants,and it has the advantages of wide range of treatment,high efficiency,non-toxic,harmLess and pollution-free.Compared with traditional pollutant treatment technology,the process is simpler Bismuth oxychloride is one of bismuth photocatalysts,which does not cause secondary pollution and has good photocatalytic activity.In this paper,bismuth oxychloride(bismuth oxychloride)was prepared by solution combustion,and its photocatalytic properties were further improved by doping modification of bismuth oxychloride with Fe,Eu and carbon nitride.Specific research contents are as follows:1.Preparation of Bi24O31Cl10 photocatalyst by using solution of lanthanum nitrate,citric acid and ammonium chloride as raw materials by solution combustion method at different temperatures and different burning time.The prepared doped samples were characterized by XRD,XPS,SEM and UV-Vis.And studied the effect of visible light catalytic activity of Bi24O31Cl10.The results show that Bi24O3iCl10 has the best photocatalytic activity when the combustion temperature is 650?,and the removal rate of Rhodamine B is 35%.On this basis,the doping of Fe and Eu was carried out to study the effect of doping components on Bi24O331Cl10o,and the prepared doped samples were characterized by XRD,XPS,SEM and UV-Vis.The results show that Fe3+?Eu and g-C3N4 have no effect on the crystal phase of bismuth oxychloride,but have an effect on its morphology.Due to the doping of Fe3+and Eu,the block morphology of the catalyst becomes thinner,and many small particles adhere to the block surface.By degrading Rhodamine B(RhB)under visible light irradiation,doping Fe3+?Eu and g-C3N4 can effectively enhance the activity of Bi24O31Cl10 photocatalyst.The photocatalytic activity is enhanced by increasing the crystal specific surface area to change the morphology,enhancing the absorption of light,reducing the forbidden band width and reducing the recombination rate of photogenerated electron-hole pairs.The best photocatalytic properties were 2Fe-Bi24O31Cl10?2Eu-Bi24O31Cl10 and 3g-C3N4-Bi24O31Cl10,which reduced the removal rate of Rhodamine B solution under visible light for 50 min to 75%?78%and 80.5%.2.To explore the bismuth oxychloride light catalyst removal of nitrobenzene in water,the experimental results show that the photocatalytic activity were the main influencing factors of solution concentration,pH and amount of catalyst into the,when solution concentration of 30mg/L?pH=6?0.05 g for the amount of catalyst,bismuth oxychloride photocatalyst to a-TNT removal effect is best,stir in the light of two and a half hours later,the a-TNT removal rate as high as 82%.