Method for preparing porous carbon nanomaterial from latex sponge

The invention discloses a method for preparing a porous carbon nanomaterial from latex sponge. The method comprises the following steps: adding latex sponge powder and KOH into ethanol, wherein a massratio of latex sponge powder to KOH to ethanol is 1:1:1-2:1:2; uniformly mixing, and heating at the temperature of 100-150 DEG C to remove ethanol; calcining the latex sponge in stages under protection of inert gases, washing the product with hydrochloric acid to remove impurities, and washing to be neutral with water and ethanol, thereby obtaining the porous carbon nanomaterial. According to themethod disclosed by the invention, rich and readily available latex sponge is used as the raw material, the cost is reduced, the latex sponge wastes can be recycled, and the pollution of the wastes to the environment is reduced. The prepared porous carbon nanomaterial has high specific surface area, the supercapacitor assembled by taking the porous carbon nanomaterial as an electrode material hashigh specific capacitance,