▎ 摘　　要

NOVELTY - Synthesizing graphene oxide-titanium(IV) oxide-manganese(IV) oxide composite sol, comprises (1) heating the acid-soluble titanium oxide to dissolve titanium(IV) oxide particles with concentrated sulfuric acid having concentration of more than 92 wt.%, and reacting with rapid stirring for 2-3 hours, cooling to room temperature to obtain acid-containing titanium(IV) oxysulfate solution, the mass ratio of concentrated sulfuric acid to titanium(IV) oxide is 1:0.5-1:6, (2) introducing acidifying graphite, 325 order flake graphite powder and sodium nitrate into the reactor, slowly adding the acid-containing titanium(IV) oxysulfate solution obtained in step (1) under ice-water bath condition, maintaining the temperature below 5 ℃, stirring for 1-3 hours, slowly adding potassium permanganate in portions at intervals of 10-30 minutes each time, heating to 25-40 ℃ and stirring rapidly for 1-3 hours. USE - The composite sol is useful in solar energy and environmental catalysis (i.e. catalytic degradation of volatile organic compounds (VOC), preferably aromatic VOCs, e.g. benzene, toluene, xylene, styrene, formaldehyde, benzaldehyde, preferably toluene), environmentally friendly building materials and air sterilization fields (all claimed). ADVANTAGE - The method: has simple flow, strong operability, relatively low cost, and is suitable for batch preparation when compared with the existing technology; has the possibility of industrialized production and has broad application prospects. DETAILED DESCRIPTION - Synthesizing graphene oxide-titanium(IV) oxide-manganese(IV) oxide composite sol, comprises (1) heating the acid-soluble titanium oxide to dissolve titanium(IV) oxide particles with concentrated sulfuric acid having concentration of more than 92 wt.%, and reacting with rapid stirring for 2-3 hours, cooling to room temperature to obtain acid-containing titanium(IV) oxysulfate solution, the mass ratio of concentrated sulfuric acid to titanium(IV) oxide is 1:0.5-1:6, (2) introducing acidifying graphite, 325 order flake graphite powder and sodium nitrate into the reactor, slowly adding the acid-containing titanium(IV) oxysulfate solution obtained in step (1) under ice-water bath condition, maintaining the temperature below 5 ℃, stirring for 1-3 hours, slowly adding potassium permanganate in portions at intervals of 10-30 minutes each time, heating to 25-40 ℃ and stirring rapidly for 1-3 hours, then slowly adding an equal volume of deionized water into the mixture, and controlling the temperature at 90-100 ℃, continuously stirring for 10-60 minutes, thus the graphite powder can be oxidized to form graphene oxide, finally allowing it to stand at room temperature to obtain graphene oxide-titanium oxysulfate mixture, (3) performing precipitation purification under agitation, slowly adding pure water to the graphene oxide-titanium oxysulfate mixture obtained in step (2) until the concentration of titanyl sulfate is 200-700 g/l, adding drop by drop into the 2.5 wt.% dilute aqueous ammonia to pH value of 6-8, settling for 4-10 hours, removing the supernatant, and washing the precipitate by centrifugation for 6-10 times, removing impurities until the eluate has no obvious red color, and dropping the eluate into nitric acid acidified barium chloride solution and no turbidity is observed to obtain graphene oxide-titanium hydroxide mixture, (4) adding the graphene oxide-titanium hydroxide mixture obtained in the step (3) into pure water and stirring until uniformly dispersed, then adding a certain amount of potassium permanganate, and adding 10-60 wt.% hydrogen peroxide solution, controlling the molecular molar ratio of hydrogen peroxide and titanium at 5:1-25:1, controlling the molar ratio of potassium permanganate and titanium at 0.1:1 to 1:1, simultaneously reacting titanium dioxide dihydrate with hydrogen peroxide to generate titanium peroxide (PTC), potassium permanganate reacted with titanium peroxide (PTC) and the remaining hydrogen peroxide to generate manganese dioxide, and heating to reflux at 90-100 ℃ for 3 hours to obtain final product. An INDEPENDENT CLAIM is also included for graphene oxide-titanium(IV) oxide-manganese(IV) oxide composite sol prepared by above method.