The Application And Research Of Photoelectrocatalysis Technology In The Treatment Of Waste Water With New Type Of Semiconductor

Increasingly serious environmental pollution in recent years,for the environment of governance is imminent.Photocatalytic technology as a very effective method of governance pollutants,gradually attract the people's attention.While traditional photocatalyst has high band gap width and low utilization rate of light quantum severely hampered by some disadvantages such as environmental pollution control in the process of practical application.How to improve the photocatalytic efficiency of photocatalyst has become a current research hot spot.Based on this,the paper carried out the new department of bismuth heterostructure titanium dioxide photocatalyst preparation and expanded graphite load related research,in order to improve the light carrier separation efficiency and speed up the surface reaction process,the main results were as followings:?1?The performance of the AgBr/Bi₂O₂CO₃ composite photocatalyst research:first of all,CTAB as source of bromine,at room temperature by AgNO₃ and CTAB AgBr precipitation system.With five water bismuth nitrate,sodium carbonate and AgBr?modulation?as raw material,through the hydrothermal method of preparation of AgBr/Bi₂O₂CO₃ composite photocatalyst.A variety of technologies?XRD,IR,SEM,etc.?the samples were characterized,and examines the content of AgBr Bi₂O₂CO₃ photocatalytic performance impact.The results show that when the AgBr load was 20%,the best photocatalyst degradation effect;For reactive brilliant blue dye?30 mg/L?degradation rate was 98.37%.?2?The performance of the composite photocatalyst AgI/BiOI research:with five water bismuth nitrate,potassium iodide,and silver nitrate content?modulation?as raw material,through a simple AgI/BiOI was prepared by hydrothermal method with composite photocatalyst,a variety of technologies?XRD,IR,SEM,etc.?the samples were characterized,and examines the AgI content on BiOI photocatalytic performance effects,the results obtained when AgI load was 21%of the preparation of photocatalyst degradation effect is best,on the degradation of dye rate was 96.03%.?3?Bi₂O₂CO₃/BiOI composite photocatalyst performance study:firstly,five water bismuth nitrate and potassium iodide as raw materials,the synthesized BiOI photocatalyst when adding a certain amount of Bi₂O₂CO₃,using simple hydrothermal prepared different Bi₂O₂CO₃ content of bismuth carbonate oxygen/iodine bismuth oxide composite photocatalyst.And a variety of detection technology?XRD,IR,SEM,etc.?type,structure and activity of the catalyst and to carry on the system analysis,the results show that when the Bi₂O₂CO₃ and BiOI than the quality of the preparation of the composite photocatalyst degradation by 2 effect is best,on the degradation of reactive brilliant blue rate was 97.04%.?4?The performance of expanded graphite load titanium dioxide composite photocatalyst research:firstly,the chemical oxidation of expandable graphite,prepared by different heat treatment temperature the preparation of expandable graphite,found that the expansion temperature is 1000? of expanded graphite adsorption performance is best,the adsorption rate was 87.94%.With titanium dioxide load on expanded graphite impregnated method,by changing the number of impregnated,calcination time,calcination temperature to get the best condition of preparation of samples.A variety of technologies?XRD,IR,SEM,etc.?the samples were characterized,and the results of the study concluded that calcination temperature is 500?,impregnated three times,when the calcination time is 2 h sample degradation rate is the best,but still no better adsorption performance of expanded graphite itself.