▎ 摘　　要

NOVELTY - Preparing ion doping and graphene composite based on lanthanum manganate comprises e.g. (i) preparation of graphene-metal nanoparticle composite structure: taking graphite powder, adding ice water bath in the flask, adding concentrated sulfuric acid, potassium permanganate, stirring, vacuum filtering and vacuum oven drying, (ii) preparation of lanthanum manganite (iii) preparation of ion-doped lanthanum manganate complex with graphene: mixing the graphene-metal nanometre particle composite structure and manganate powder, wet ball milling, fully mixing, drying, sieving and granulating. USE - The lanthanum manganate is useful for ethylene complex in photocatalysis (claimed). ADVANTAGE - The lanthanum manganate: has light catalytic activity and interface relation to graphene; improves light catalysis efficiency. DETAILED DESCRIPTION - Preparing ion doping and graphene composite based on lanthanum manganate comprises (i) preparation of graphene-metal nanoparticle composite structure: taking 1 g graphite powder, adding ice water bath in the flask, adding 50 ml 98% concentrated sulfuric acid, slowly adding 3.5 g potassium permanganate, stirring for 5 minutes, transferring to 25 degrees C water bath, stirring for 24 minutes and transferring into the ice water bath, slowly adding 200 ml deionized water, stirring for 10 minutes, removing ice water bath, dropping 3 ml 30% hydrogen peroxide at room temperature, stirring for 30 minutes, transferring to a centrifugal tube centrifugal removing supernatant, precipitating by dilute hydrochloric acid centrifugal washing for 2 times, repeatedly washing until the pH is 3-4 by using deionized water, vacuum filtering 30 minutes, vacuum oven drying at 50 degrees C, dispersing with ultrasonic to aqueous solution of polyvinyl pyrrolidone at concentration of 0.03 mg/ml, adding metal precursor, the concentration of the metal ion is 0.9-1.0 mmol/l, quickly adding aqueous sodium borohydride solution, stirring for 1-3 hours, separating solid from liquid, and drying to obtain the graphene oxide and metal nanoparticle composite structure, (ii) preparation of lanthanum manganite: taking lanthanum manganate using solid phase method and solution-gel method to obtain lanthanum manganate powder, and (iii) preparation of ion-doped lanthanum manganate complex with graphene: mixing the graphene-metal nanometre particle composite structure and manganate powder, wet ball milling, fully mixing, drying, sieving, granulating, adding into a graphite mold for discharging plasma quick sintering, heating at 1000-1200 degrees C for 5-10 minutes with pressure of 60-100 MPa, maintaining the temperature for 5-10 minutes to obtain the ion doped lanthanum manganate with graphene composite.