Ag Decoration and SnO 2 Coupling Modified Anatase/Rutile Mixed Crystal TiO 2 Composite Photocatalyst for Enhancement of Photocatalytic Degradation towards Tetracycline Hydrochloride.

The anatase/rutile mixed crystal TiO 2 was prepared and modified with Ag decoration and SnO 2 coupling to construct a Ag@SnO 2 /anatase/rutile composite photocatalytic material. The crystal structure, morphology, element valence, optical properties and surface area were characterized, and the effects of Ag decoration and SnO 2 coupling on the structure and photocatalytic properties of TiO 2 were studied. Ag decoration and SnO 2 coupling are beneficial to reduce the recombination of photogenerated electrons and holes. When the two modification are combined, a synergistic effect is produced in suppressing the photogenerated charge recombination, making Ag@SnO 2 /TiO 2 exhibits the highest quantum utilization. After 30 min of illumination, the degradation degree of tetracycline hydrochloride (TC) by pure TiO 2 increased from 63.3% to 83.1% with Ag@SnO 2 /TiO 2 .