▎ 摘　　要

NOVELTY - Preparing nanocomposites of titanium dioxide and graphene, comprises (a) mechanically exfoliating graphite by grinding in a graphite ball mill with melamine in a weight ratio of 1:3 respectively at a speed of 75-125 revolutions/minute for 20-40 minutes and inverting the rotation at each interval of 2-5 minutes, (b) washing the resultant product with water at 60-80° C, (c) mixing titanium isopropoxide with a low-boiling, short-chain 1-5C alcohol, preferably ethanol, in the presence of 0.2-1 vol.% aqueous saline solution, preferably potassium hypoiodite, (d) sonicating the resultant product and subsequently washing at least once with water by dialysis, lyophilizing the precipitate under vacuum at 70-90° C for 65-80 hours, (e) mixing product of step (b) with 0.05-2 wt.% the product of step (d) in a planetary mill, and (f) sonicating the resultant product and lyophilizing at 70-90° C under vacuum for 60-80 minutes. USE - The method is useful for preparing nanocomposites of titanium dioxide and graphene which is used as hybrid photocatalyst for photo-oxidation reactions and as an efficient photocatalyst in elimination of pesticides (all claimed) and treating organic pollutants e.g. aqueous effluents contaminated with herbicides and pesticides. No biological data given. ADVANTAGE - The method is safe and suitable for ecological synthesis of graphene with less generation of waste through the use of natural or biocompatible reducing agents. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for nanocomposite of titanium dioxide and graphene obtained by the method, comprising 0.05-2 wt.% graphene with few layers, titanium dioxide nanoparticles with a diameter size of 2-50 nm, where the nanoparticles are deposited on the surface of graphene with few layers, in the Raman spectrum, carried out in equipment equipped with a laser with a wavelength of 532 nm with a power density of below 1 mW/μ m2, shows an Eg band with a maximum around of 160 cm-1 of the Raman spectrum; use of nanocomposite as hybrid photocatalyst for photo-oxidation reactions and as an efficient photocatalyst in elimination of pesticides; and pesticide photodegradation process, comprising (i) reacting the nanocomposite with aqueous solution, and (ii) applying radiation with wavelength of 365-780 nm to the resultant solution.