| TiO2 semi-conductor photocatalyst has the function of sterilization,antipollutionand so on.As one of the Purification materials of the new generation,it has been widely applicated for its high catalysis activeness,chemical stability,Inexpensive and security.At present,domestic and international scientists are mainly researehing single mechanism and application of antibacterial materials,application scope and effect are restricted.This paper focuses on the finding of best cerium content,calcinations temperature as optimum parameter and the exploration of relevant antibacterial mechanism when H3BO3/Zn2+?H3BO3/Ce3+?H3BO3/Y3+ are mixed to TiO2.which means important realistic significance for the exploitation and application of titanium dioxide in the field of the production of photocatalytic antibacterial material.This paper mainly adopts the method of ion doping,under the excitation of visible light,improve TiO2 phot catalytic antibacterial activity.Tetrabutyl titanate[Ti(OC4H9)4],ethyl alcohol,deionized water,glacial acetic acid,boric acid,zinc nitrate,cerous nitrate,yttrium nitrate as raw materials.TiO2 nano-materials and B-Zn/TiO2?B-Ce/TiO2?B-Y/TiO2 nano-materials co-doped boron and zinc,boron and cerium boron and yttrium were prepared by sol-gel method.We use XRD,SEM,UV-Vis-DRS,BET to analyze the crystal structure of antibacterial material and its surface topography.The antibacterial activities of TiO2 against Escherichia coli(ATCC25922)and Staphylococcus aureus(ATCC6538)were investigated by inhibition zone method and flask oscillation method.Results of test and analysis are as follows.1.Antibacterial research of pure TiO2 nanomaterials.After roasting of 500?800 ?,crystal shape start to shift from anatase Ti02 to rutile TiO2,its temperature is 600 ?,The antibacterial activities of TiO2 nano-materials against Escherichia coli(ATCC25922)and Staphylococcus aureus(ATCC6538)were investigated by inhibition zone method and flask oscillation method.The results showed that TiO2 nano-materials had no antibacterial activities to Escherichia coli(ATCC25922)and Staphylococcus aureus(ATCC6538).2.Explore the effect of the variation of doping ratio of B/Zn and calcination temperature.The antibacterial experiment suggest that the best dosage ratio of B/Zn is 0.02 mol?0.025 mol,the best calcination temperature should be 600 ? for Zn-B/Ti02,the sterilization rate can reach more than 99%;the best dosage ratio of B/Zn is 0.03 mol?0.0025 mol,the best calcination temperature should be 600 ? for Zn-B/TiO2,the thickness of the bacteriostatic circle can reach more than 7mm.At different calcination temperature,antibacterial activity from strong to weak in order is that:600 ?>500 ?>700 ?>800 ?,antibacterial activity in dark light is less than lighting condition,but it is also quite strong.3.Explore the effect of the variation of doping ratio of B/Ce and calcination temperature.The antibacterial experiment suggest that the best dosage ratio of B/Ce is 0.03 mol-0.003 mol,the best calcination temperature should be 600 ? for Ce-B/TiO2,the sterilization rate can reach more than 95%at least;the best dosage ratio of B/Ce is 0.03 mol?0.001 mol,the best calcination temperature should be 800 ? for Ce-B/TiO2,the thickness of the bacteriostatic circle can reach more than 8mm.By UV-Vis-DRS detection,At calcination temperature of 500?800 ?,red shift degree of Ce-B/TiO2 in order is 800 ?>500 ?>600 ?>700 ?.Through systematic analysis of the experiment,we can discover that boron plays a major role in lask oscillation method.cerium plays a major role in inhibition zone method.4.Explore the effect of the variation of doping ratio of B/Y and calcination temperature.The antibacterial experiment suggest that the best dosage ratio of B/Y is 0.02 mol?0.005 mol,the best calcination temperature should be 700 ? for Y-B/TiO2,the sterilization rate can reach more than 95%;the best dosage ratio of B/Y is 0.03 mol?0.001 mol,the best calcination temperature should be 700 ? for B-Y/TiO2,The thickness of the bacteriostatic circle can reach more than 7mm.By XRD detection B-Y/TiO2 is calcined from 500 C to 700 ?,crystallinity is very poor,at the temperature of 800 ?,crystallinity is in good condition.However excellent crystallinity is adverse to photocatalytic reaction,at the temperature of 700 ?,photocatalytic reaction remains in the best condition,achieves the effective antibacterial. |
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