Preparation method of nickel-containing waste residue derived metal-nitrogen doped carbon catalyst

The invention relates to a preparation method of a nickel-containing waste residue derived metal-nitrogen doped carbon catalyst, which comprises the following steps: dissolving nickel-containing waste residue by using a mixed solution of acid and hydrogen peroxide, filtering to obtain a solution, adding coffee residue into the obtained solution, adjusting the pH value of the solution to be alkaline by using dopamine hydrochloride, and stirring; the preparation method comprises the following steps: preparing a solution, heating and evaporating the solution to dryness to obtain a solid, putting the obtained solid into a quartz boat, putting the quartz boat into a tubular furnace, and performing high-temperature carbonization under the condition of ammonia/nitrogen mixed gas to obtain the metal-nitrogen doped carbon catalyst. The prepared catalyst can be directly used for removing organic pollutants in wastewater, the catalytic activity of the carbon material can be improved through introduction of nitrogen atom