▎ 摘　　要

NOVELTY - Preparing graphene nanosheets/cobalt phthalocyanine/titanium dioxide photocatalyst comprises adding e.g. graphite powder into reaction kettle, placing in a oven to obtain product A, diluting the product A, adding graphene oxide into anhydrous ethanol to obtain precipitate, drying to obtain graphene oxide, ultrasonic processing to obtain graphene dispersion liquid, taking e.g. acetic acid, adding distilled water to obtain uniform sol, placing into a reaction kettle, drying to obtain titanium dioxide, placing into obtained graphene dispersion to obtain product C, calcining and grinding. USE - The method is useful for preparing graphene nanosheets/cobalt phthalocyanine/titanium dioxide photocatalyst (claimed). ADVANTAGE - The photocatalyst helps to dope the catalyst nonmetallic elements carbon, nitrogen and magnesium, reducing the band gap of titanium dioxide, broaden the response range of titanium dioxide to visible light, inhibiting the electron-hole combination, enhances the transfer rate of electrons so that electrons and holes are separated and degradation of hexavalent chromium in visible light. DETAILED DESCRIPTION - Preparing graphene nanosheets (GNs)/cobalt phthalocyanine (CoPcS)/titanium dioxide photocatalyst comprises (a) using sealed oxidation, adding 1 g graphite powder, 5 g potassium permanganate and 50 ml concentrated sulfuric acid into reaction kettle, freezing for a period of time, taking out, quickly placing in a oven to obtain product A, (b) cooling and diluting the product A, adding hydrogen peroxide until the solution became yellow, adding graphene oxide into anhydrous ethanol, taking out to obtain precipitate, washing using dilute hydrochloric acid and de-ionized water, drying to obtain graphene oxide, ultrasonic processing to obtain graphene dispersion liquid, (c) taking butyl titanate, acetic acid, anhydrous ethanol in a ratio of 10:3.2:36, stirring for a certain time, adding 2 ml distilled water, stirring for a period of time to obtain uniform sol, (d) taking the uniform sol into a reaction kettle, after reacting for a certain time, washing using distilled water and absolute ethyl alcohol, drying to obtain titanium dioxide, (e) taking titanium dioxide, sulfonated cobalt phthalocyanine, 3.3 ml N N-dimethylacetamide, manganese nitrate and magnesium nitrate in a mass ratio of 2000:60:10:10 into obtained graphene dispersion, ultrasonic filtering to obtain product C, and (f) taking the obtained product C into a muffle furnace, calcining at high temperature and grinding.