Aluminum ash-based porous carbon composite material as well as preparation method and application thereof

The invention relates to an aluminum ash-based porous carbon composite material as well as a preparation method and application thereof. The preparation method of the aluminum ash-based porous carbon composite material comprises the following steps: S1, pretreatment; the industrial solid waste aluminum ash is soaked in an alkaline aqueous solution to be stirred, and a mixture is obtained; s2, preparing a precursor product; s2, under the nitrogen condition, performing one-step high-temperature carbonization pyrolysis on the mixture obtained in the step S1 and a carbon-containing non-metal compound to obtain a precursor product retaining the topological structure morphology of the precursor; s3, preparing a porous carbon composite material; and S2, washing the precursor product obtained in the step S2 with a hydrochloric acid solution, washing with water until the pH value is neutral, separating, drying, and grinding to obtain the product. The method has the beneficial effects that the industrial solid waste al