Method for preparing nitrogen-doped activated carbon by microwave heating

The invention discloses a method for preparing nitrogen-doped activated carbon by microwave heating, which comprises the following steps: step 1, taking low-order weakly caking coal/non-caking coal as a raw material, crushing, screening, pickling and washing to remove ash in the coal, and drying to obtain ash-removed coal particles; 2, uniformly mixing the coal particles, a nitrogen-containing precursor and an activating agent, putting the mixture into deionized water, and drying; 3, activating the dried mixture in a microwave reactor to prepare activated carbon, so as to obtain an activated product; and 4, washing the activating agent in the activated product by using deionized water, and drying to obtain the nitrogen-doped activated carbon. According to the nitrogen-doped active carbon, the low-order weakly-viscous/non-viscous coal is used as a precursor, efficient doping of surface nitrogen functional groups is achieved through microwave heating, a developed pore structure is obtained while the high doping