Nitrogen-doped porous carbon material adsorbent for treating dye wastewater as well as preparation method and application thereof

The invention discloses a nitrogen-doped porous carbon material adsorbent for treating dye wastewater as well as a preparation method and application thereof. The preparation method comprises the following steps: uniformly mixing walnut shells and a nitrogen source, and grinding to obtain a first mixture; carrying out carbonization treatment on the first mixture in a protective atmosphere, and uniformly mixing and grinding an obtained carbonized product and a potassium salt to prepare a second mixture; and activating the second mixture in a protective atmosphere to obtain the nitrogen-doped porous carbon material adsorbent for treating dye wastewater. The nitrogen-doped porous carbon material adsorbent provided by the invention has a relatively good adsorption effect on malachite green dye, the adsorption efficiency is high, the adsorption capacity within 5min reaches 4001 mg/g, the adsorption capacity is large, the dye removal rate is high, the maximum adsorption capacity is 4500mg/g. The preparation process