▎ 摘　　要

NOVELTY - Preparing denitrification solid carbon source comprises (i) dissolving polylactic acid in organic solvent, then dropping reinforcing oxidant solution and carrying out oxidation pre-treatment, adjusting the pH of the solution to 6-8 to obtain the modified polylactic acid, (ii) uniformly dispersing the graphene oxide nanosheet in the deionized water, heating the obtained graphene oxide dispersion water bath, quickly soaking into liquid nitrogen until completely freezing, freeze drying, adding graphene oxide nano-coil in 100 ml containing 1 wt.% polydiallyldimethylammonium chloride aqueous solution for ultrasonic treatment for 2-4 hours, filtering and vacuum drying to obtain the graphene oxide nano-coil modified by diallyl dimethyl ammonium chloride, (iii) mixing the obtained modified polylactic acid and polymer and stirring uniformly to obtain the mixed solution, and mixing the mixed solution, graphene oxide nano-coil modified by adhesive and diallyl dimethyl ammonium chloride. USE - The method is useful for preparing denitrification solid carbon source. ADVANTAGE - The method enables to prepare denitrification solid carbon source, which has mild chemical oxygen demand release, long duration and moderate amount. DETAILED DESCRIPTION - Preparing denitrification solid carbon source comprises (i) dissolving polylactic acid in organic solvent, then dropping reinforcing oxidant solution and carrying out oxidation pre-treatment, adjusting the pH of the solution to 6-8 to obtain the modified polylactic acid, (ii) uniformly dispersing the graphene oxide nanosheet in the deionized water, heating the obtained graphene oxide dispersion water bath, quickly soaking into liquid nitrogen until completely freezing, freeze drying, adding graphene oxide nano-coil in 100 ml containing 1 wt.% polydiallyldimethylammonium chloride aqueous solution for ultrasonic treatment for 2-4 hours, filtering and vacuum drying to obtain the graphene oxide nano-coil modified by diallyl dimethyl ammonium chloride, (iii) mixing the obtained modified polylactic acid and polymer and stirring uniformly to obtain the mixed solution, and mixing the mixed solution, graphene oxide nano-coil modified by adhesive and diallyl dimethyl ammonium chloride in tetrahydrofuran, and stirring the mixture at room temperature under the protection of argon gas for 2-4 hours, centrifuging the mixture and washing with tetrahydrofuran, performing heat treatment under the protection of argon gas to obtain the final product.