TiO2 nanoparticles were prepared by directly forced hydrolysis of Ti（SO4）2.The effect of calcination temperature on crystalline phase,physical and chemical properties of resulted particles was also investigated.The ...TiO2 nanoparticles were prepared by directly forced hydrolysis of Ti（SO4）2.The effect of calcination temperature on crystalline phase,physical and chemical properties of resulted particles was also investigated.The results showed that the calcination temperature had dominant influence on crystalline phase,specific surface area and photocatalytic performance of the TiO2 particles.Below 600℃,high order TiO2 crystalline phase cannot be obtained,whereas,anatase phase with a particle size of 18 nm was obtained at 700℃.When the temperature increased to 800℃,only anatase phase presented.The presence of SO2-4 restrains the transformation of anatase to rutile,strengthens the ability against sintering.The catalyst calcined at 700℃ has optimal catalytic performance and the highest specific surface area.The photocatalytic decolorization percentages of methyl orange at 90 min and Rhodamine B at 60 min reached 98.4 and 99.8%,respectively.展开更多
文摘TiO2 nanoparticles were prepared by directly forced hydrolysis of Ti（SO4）2.The effect of calcination temperature on crystalline phase,physical and chemical properties of resulted particles was also investigated.The results showed that the calcination temperature had dominant influence on crystalline phase,specific surface area and photocatalytic performance of the TiO2 particles.Below 600℃,high order TiO2 crystalline phase cannot be obtained,whereas,anatase phase with a particle size of 18 nm was obtained at 700℃.When the temperature increased to 800℃,only anatase phase presented.The presence of SO2-4 restrains the transformation of anatase to rutile,strengthens the ability against sintering.The catalyst calcined at 700℃ has optimal catalytic performance and the highest specific surface area.The photocatalytic decolorization percentages of methyl orange at 90 min and Rhodamine B at 60 min reached 98.4 and 99.8%,respectively.
