| With the rapid development of industrialization and urbanization,all kinds of organic pollutants enter and destroy the water environment,which seriously threaten the long-term development of human society.Due to its advantages of high efficiency,simplicity,reusability and environmental friendliness,photocatalytic technology has been widely used in photocatalytic decomposition of organic pollutants and hydrogen production by water photolysis.Among the photocatalyst,silver based materials,bismuth based materials and MOF materials show excellent performance in photocatalytic hydrogenation,water photolysis and organic pollutants degradation.In present word,we reported the preparation of ternary AgX/Ag/M(X=Cl,I;M=Bi2O2CO3,BiOBr,MOF)nano composite and investigated their photocatalytic performance for Rhodamine B(RhB),tetracycline(TC),carbamazepine(CBZ)degradation.(1)Bi2O2CO3(BOC)semiconductor photocatalyst was firstly prepared by hydrothermal method,and then AgI/Ag/Bi2O2CO3(AgI/Ag/BOC)composite photocatalyst was obtained with an in-situ deposition and photoreduction process.The characterization results showed that the prepared AgI/Ag/Bi2O2CO3 photocatalyst is composed of a large number of circular AgI/Ag nanoparticles with diameter less than 10nm and disorderly stacked BOC nano sheets.The results of photocatalytic degradation experiments show that under the simulated sunlight,AgI/Ag/BOC photocatalysts show the highest photocatalytic degradation efficiency compared with BOC,AgI and Agl/BOC photocatalysts,which can degrade more than 90%of Rhodamine B(RhB),tetracycline(TC)and more than 80%of carbamazepine(CBZ)in 120min.The improvement of photocatalytic performance may be due to the special indirect Z-type structures of Agl/Ag/BOC composite photocatalyst which can effectively enhance the absorption of sunlight and effectively separate the photocarriers.(2)AgCl/Ag/Bi2O2CO3(AgCl/Ag/BOC)composite photocatalyst was prepared using the similar process of Agl/Ag/BOC.The AgCl/Ag/BOC composite also showed ternary structures including a large number of AgCl/Ag nanoparticles and disorderly stacked BOC nano sheets.AgCl/Ag/BOC photocatalysts had the best solar light induced photocatalytic performance compared with BOC,AgCl and AgCl/BOC photocatalysts.After 120 min of irradiation,the removal rate of RhB on AgCl/Ag/BOC was more than 95%,and that of CBZ and TC was more than 80%.The excellent photocatalytic activity of AgCl/Ag/BOC may be due to the indirect Z-type structures of AgCl/Ag/BOC photocatalyst,which can increase the absorption of sunlight and effectively separate photogenerated e-/h+.(3)The BiOBr catalyst was firstly prepared by hydrothermal method,then the AgI/Ag/BiOBr composite photocatalyst with different AgI/Ag loading was prepared by in-situ deposition method and photoreduction method(3%Agl/Ag/BiOBr,5%Agl/Ag/BiOBr,10%AgI/Ag/BiOBr,15%AgI/Ag/BiOBr,20%AgI/Ag/BiOBr).The photocatalytic results demonstrated that that 10%AgI/Ag/BiOBr has the highest photocatalytic efficiency for CBZ degradation compared with other photocatalysts.Moreover,it still has high reproducibility after four times of recycling.The excellent photocatalytic performance of 10%AgI/Ag/BiOBr may be due to the fact that the metal Ag in the indirect Z-type photocatalytic system provides a powerful bridge for the effective transfer of interface electrons and accelerates the transfer of photogenerated carriers.(4)Cu based metal organic framework materials(MOF)were first prepared by hydrothermal method,and then AgI/Ag/MOF composite photocatalysts were prepared by in-situ deposition and photoreduction.The results show that the prepared AgI/Ag/MOF photocatalyst has rod-like structures.The results of photocatalytic degradation showed that AgI/Ag/MOF had the highest photocatalytic degradation activity,and the removal rates of RhB and TC were 94%and 96%respectively at 120min.The improved photocatalytic activity of AgI/Ag/MOF composite photocatalyst may be due to the enhanced absorption region of visible light and the effective separation of photocarriers. |
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