▎ 摘　　要

NOVELTY - A titanium dioxide 25 (nano-titanium dioxide mixed crystal type anatase/rutile)-ferritegraphene nanometer catalyst which is capable of magnetically separating titanium dioxide comprises titanium dioxide P25, ferrate and graphene coated on their surfaces. USE - As titanium dioxide P25-ferritegraphene nanometer catalyst for magnetically separating titanium dioxide (claimed). ADVANTAGE - The titanium dioxide P25-ferritegraphene nanometer catalyst is capable of magnetically separating titanium dioxide. The titanium dioxide P25-ferritegraphene nanometer catalyst is made from graphite which is used as support material; provides a larger specific surface area and more active center. By using hydro-thermal reaction, the graphite oxide into graphene is reduced, which avoids using other reducing agent to the environment. The test method is simple and easy to operate. The catalyst is capable of magnetic separation of P25-MFe2O4-graphene nano catalyst in the sewage treatment, and provides recycling with good application prospect and economic benefit. The preparation before P25-graphene or MFe2O4-graphene as compared to P25 to MFe2O4-graphene nanometer photo-catalyst exhibits more excellent photo-catalytic performance. The preparing method is simple, with mild condition. DETAILED DESCRIPTION - A titanium dioxide P25-ferritegraphene nanometer catalyst capable of magnetically separating titanium dioxide comprises titanium dioxide P25 (0.5-20 wt.%), ferrate and graphene coated on their surfaces, where the ferrite has molecular formula of M1Fe2O4. The mass ratio of the iron salt to the graphene is 1:1-2 (preferably 1:1). The P25 is present in an amount of 0.5-20 wt.%. M1=Co, Zn, Cu, Ni or Mn. An INDEPENDENT CLAIM is included for preparation of titanium dioxide P25-ferritegraphene nanometer catalyst involving: ultrasonically dispersing graphite oxide in the ethanol, obtaining the graphene oxide solution; mixing the P25, iron salt and divalent salt of M1 element, stirring and dissolving in ethanol; mixing the solution at the two steps, stirring, stirring, adjusting the pH value; shifting the reaction system in third step to the hydrothermal kettle, reacting; centrifuging and separating the product in the fourth step, washing with de-ionized water, drying, obtaining the P25-CoFe2O4-graphene nanometer catalyst.