N-doped anatase-rutile titanium dioxide(N-TiO2)is a classical semiconductor widely used in environmental remediation.Its photocatalytic performance is typically affected by its morphology,porous structure,and phase co...N-doped anatase-rutile titanium dioxide(N-TiO2)is a classical semiconductor widely used in environmental remediation.Its photocatalytic performance is typically affected by its morphology,porous structure,and phase composition.Herein,disk-like mesoporous N-TiO2 was prepared by calcining MIL-125(Ti)and melamine matrix at different temperatures in air.The photocatalytic efficiency of the prepared mesoporous N-TiO2 for the photo-oxidation of gaseous benzene under visible-light irradiation was studied.With respect to light absorption and mass transfer,as-prepared N-TiO2 annealed at 500℃(MM-500)showed the best photocatalytic activity with corresponding photodegradation and mineralization efficiencies of 99.1%and 72.0%,respectively.In addition.MM-500 exhibited excellent reusability and stability in cyclic experiments,in which 84.8%of gaseous benzene could still be photodegraded after 10 experimental cycles.Furthermore,electron spin resonance analysis indicated that·OH and·O2-radicals were the dominating reactive oxygen species during the photo-oxidation process.Their excellent performance suggests that the as-prepared N-TiO2 photocatalysts can be used to eliminate volatile organic compounds.展开更多
文摘N-doped anatase-rutile titanium dioxide(N-TiO2)is a classical semiconductor widely used in environmental remediation.Its photocatalytic performance is typically affected by its morphology,porous structure,and phase composition.Herein,disk-like mesoporous N-TiO2 was prepared by calcining MIL-125(Ti)and melamine matrix at different temperatures in air.The photocatalytic efficiency of the prepared mesoporous N-TiO2 for the photo-oxidation of gaseous benzene under visible-light irradiation was studied.With respect to light absorption and mass transfer,as-prepared N-TiO2 annealed at 500℃(MM-500)showed the best photocatalytic activity with corresponding photodegradation and mineralization efficiencies of 99.1%and 72.0%,respectively.In addition.MM-500 exhibited excellent reusability and stability in cyclic experiments,in which 84.8%of gaseous benzene could still be photodegraded after 10 experimental cycles.Furthermore,electron spin resonance analysis indicated that·OH and·O2-radicals were the dominating reactive oxygen species during the photo-oxidation process.Their excellent performance suggests that the as-prepared N-TiO2 photocatalysts can be used to eliminate volatile organic compounds.
