▎ 摘　　要

NOVELTY - Catalyst comprises complex of 1-10 wt.% transition metals and graphene oxide, where the transition metals comprises manganese, iron, and/or zinc. USE - The catalyst is useful for harmlessly treating highly toxic wastewater (claimed). ADVANTAGE - The catalyst is simple and economical, will not be poisoned by highly toxic substances, has high catalytic ability, degradation effect than the corresponding graphene complex catalyst and excellent effect in highly toxic wastewater, ensures catalytic activity and catalytic effect, and can effectively degrade highly toxic substances and organic pollutants in wastewater. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (A) a method for preparing the catalyst involving (i) selecting aqueous solution with volatile organic alcohol as solvent, where the volume fraction of water in solvent is 0-20%, and adding 1-2 wt.% nonionic surfactant comprising Pluronic P123 (RTM: Symmetric triblock copolymer) and Pluronic F127 (RTM: Polyoxyethylene-polyoxypropylene triblock copolymer), (ii) adding graphene oxide as a suspension, where the concentration of graphene oxide in solvent is 0.5-5 mg/ml, (iii) adding the above-mentioned organic alcohol-containing two aqueous solution of transition metal salt to the mixture, where the volume fraction of water in the aqueous solution is 0-20%, and the concentration of second transition metal salt-containing aqueous solution containing the above-mentioned organic alcohol in graphene oxide is 5-10 times of the concentration in the solvent, and (iv) stirring for 3-10 hours at room temperature in an ultrasonic field, slowly evaporating at 40-50 degrees C for 36-60 hours, centrifuging, washing and blowing to obtain the complex; and (B)use of the catalyst in harmless treatment of highly toxic wastewater.