Preparation of N-Doped TiO2-Loaded Halloysite Nanotubes and Its Photocatalytic Activity under Solar-Light Irradiation

摘要

The N-doped TiO2-loaded halloysite nanotubes (N-TiO2/HNTs) nanocomposites were prepared by using chemi-cal vapor deposition method which was realized in autoclave. The photocatalytic activity of nanocomposites was evaluated by virtue of the decomposition of formaldehyde gas under solar-light irradiation. The XRD patterns veriifed that the anatase structured TiO2 was deposited on HNTs. The TEM images showed that the surface of HNTs was covered with nanosized TiO2 with a particle size of ca. 20 nm. The UV-vis spectra indicated that the N-TiO2/HNTs presented a signiifcant absorption band in the visible region between 400 nm and 600 nm. Under solar-light irradiation, the highest degradation rate of formal-dehyde gas attained 90%after 100 min of solar-light irradiation. The combination of the photocatalytic property of TiO2 and the unique structure of halloysite would assert a promising perspective in degradation of organic pollutants.