▎ 摘　　要

NOVELTY - Preparing complex photo-catalyst comprises (i) mixing graphene oxide, titanium dioxide and water, and (ii) carrying out hydro-thermal treatment to the mixture obtained in the step (i), and loading graphene oxide on the titanium dioxide surface. USE - The method is useful for preparing complex photo-catalyst. ADVANTAGE - The method consumes less energy. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) complex photo-catalyst; and (2) degrading organic phenol comprising contacting complex photo-catalyst with the liquid sample containing organic phenol, and then illuminating, where the photo-catalyst is modified by graphene and titanium dioxide.