Preparation of Dihydroxy Naphthalene/TiO2 Complex via Surface Modification and Their Photocatalytic H2 Production Performances Under Visible Light

摘要

The dihydroxy naphthalene/TiO2 complexes with different substitution patterns were prepared by surface modification. X-ray diffraction, UV-Vis spectroscopy, photoluminescence, and X-ray photoelectron spectroscopy were used to characterize the prepared composite materials. The results indicated that the surface modification did not influence the crystallization of TiO2. The visible-light absorbances of prepared dihydroxy naphthalene/TiO2 complexes could be assigned to the ligand-to-metal charge transfer. The obtained catalyst exhibited outstanding photocatalytic activity and stability under visible light. A linear relationship existed between the percentages of hydroxynaphthalenes coordinated on TiO2 surface and H2 production ability. The substitution pattern of dihydroxy naphthalene and CH3OH content could also influence the photocatalytic performance remarkably. The photocatalytic H2 production ability was further improved after loading with ultra low concentration of Pt, 0.02 wt %. The possible mechanism was proposed."