Photocatalytic Hydrogen Production from Aqueous Methanol Using Cu/S-TiO2 Under Visible-Light

摘要

Copper was loaded on the S-doped TiO2 by methods of electroless plating, wet impregnation and chemical reduction, respectively. The physical structure and chemical properties of the prepared Cu/S-TiO2 were characterized by UV-visible, XRD, XPS, EXAFS and FESEM techniques. It was illustrated that copper species loaded by electroless copper plating and wet impregnation method were Cu2O/CuO, while Cu/Cu2O was loaded by chemical reduction method. The Cu/S-TiO2 prepared by electroless plating method showed excellent visible light absorption ability. Moreover, the electroless plated copper on S-TiO3 was highly dispersed, which could facilitate the photo-generated charges capture, transfer and separation. Thus, the catalyst exhibited the highest photocatalytic activity of the three for hydrogen generation and is up to 7.5 mmol h~(-1)g~(-1) cat in methanol solution under visible light and a possible catalytic mechanism was proposed.