A series of photocatalysts with blank TiO2 and modified with transition metal ions(Ni,Fe,Ag,Zn)are prepared via the sol-gel method,and characterized by means of FTIR,XRD and SEM.Taking gasoline gas as the target pollutant,the influences of different process conditions on the photocatalytic degradation of these photocatalysts are evaluated.It is found that compared with blank TiO2,the transition metal ion modified photocatalysts have a significantly smaller grain size,more uniformly dispersing surface,and greater number of hydroxyl groups.Among them,Zn ion modified photocatalyst shows the best catalytic degradation effect on gasoline gas.The degradation efficiency of gasoline gas reaches 76.6%within 3 hours when the molar ratio of Zn/TiO2 is 0.2%,the calcination temperature is 550℃,the initial concentration of gasoline gas is 14 042.55 mg·m-3,the dosage of photocatalyst is 30 g,and the light intensity is 36 W·m-2,which are the optimal degradation conditions.
TiO2transition metal ionphotocatalytic degradationgasoline gas
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