▎ 摘　　要

NOVELTY - Preparing graphene/iron/titanium dioxide composite photocatalyst, comprises: e.g. (a) preparing titanium dioxide nanotubes by hydrothermal method comprising dispersing 1 pts. wt. P25 nano-titanium dioxide in 80-100 pts. wt. sodium hydroxide solution with a concentration of 10 mol/l and magnetically stirring for 0.4-0.6 hours, carrying out the reaction in air drying oven, cooling to room temperature, drying at a low temperature, and calcining in a muffle furnace to obtain a titanium dioxide nanotube; and (b) preparing iron/titanium dioxide nanotubes by impregnation method by mixing 3.5-27 pts. wt. ferric chloride hexahydrate solids with 80 pts. wt. titanium dioxide nanotubes, adding 3200 parts at a concentration of 0.1 mol/l in the hydrochloric acid solution to prepare a precursor mixture and then ultrasonically dispersing, stirring at room temperature, drying at a low temperature, and calcining in a muffle furnace, and preparing iron/titanium dioxide nanotubes. USE - The method is useful for preparing graphene/iron/titanium dioxide composite photocatalyst. ADVANTAGE - The method provides graphene/iron/titanium dioxide composite photocatalyst which can only absorb the small amount of UV light of solar radiation, has small specific surface area and low photocatalytic efficiency, increases the specific surface area of the material, and can broaden the visible light region and improve the visible light catalysis. DETAILED DESCRIPTION - Preparing graphene/iron/titanium dioxide composite photocatalyst, comprises: (a) preparing titanium dioxide nanotubes by hydrothermal method comprising dispersing 1 pts. wt. P25 nano-titanium dioxide in 80-100 pts. wt. sodium hydroxide solution with a concentration of 10 mol/l and magnetically stirring for 0.4-0.6 hours, in the reaction kettle, carrying out the reaction at 150 degrees C for 48 hours in an electric heating constant temperature air drying oven, cooling to room temperature, drying at a low temperature, and calcining in a muffle furnace to obtain a titanium dioxide nanotube; (b) preparing iron/titanium dioxide nanotubes by impregnation method by mixing 3.5-27 pts. wt. ferric chloride hexahydrate solids with 80 pts. wt. titanium dioxide nanotubes obtained in the step (a), and adding 3200 parts at a concentration of 0.1 mol/l in the hydrochloric acid solution to prepare a precursor mixture and then ultrasonically dispersing, stirring at room temperature, drying at a low temperature, and calcining in a muffle furnace, and preparing iron/titanium dioxide nanotubes; and (c) preparing iron/titanium dioxide nanotube/graphene composite by wet chemical mixing method by placing 1 pts. wt. iron/titanium dioxide nanotube prepared in step (b), in a beaker, and adding 0.01-0.05 pts. wt. graphene, then separately transferring 4 parts of absolute ethanol and 5 parts of distilled water in a beaker, stirring the mixture at room temperature, drying in an oven, roasting in a muffle furnace, and obtaining graphene/iron/titanium dioxide nanotube composite light catalyst.