Visible light induced TiO_2 pillared MMT photocatalyst coupling-doped with S and N

摘要

Visible light induced titanium dioxide (TiO2) pillared montmorillonite clay (MMT) photocatalyst coupling-doped with S and N elements was prepared by the two-step ad- sorption method.The photocatalyst was characterized by X-ray photoelectron spectros- copy (XPS) and ultraviolet-visible (UV-vis) absorption spectroscopy.The photocatalysic ef- ficacy of the prepared photocatalyst for degrading gaseous formaldehyde was evaluated under visible light irradiation.The degrading rate of gaseous formaldehyde is nearly 85% in 300 min visible light irradiation.The results demonstrate that the much higher visible light photocatalytic activity of the photocatalyst is due to the synergistic effects of coupling- doping of S and N elements to TiO2,extensive specific surface area of MMT and quantum sized efficacy between layers of MMT.