Quaternary ammonium modified iron-doped graphite phase carbon nitride Fenton catalyst as well as preparation method and application thereof

Abstract

The invention discloses a quaternary ammonium modified iron-doped graphite phase carbon nitride Fenton catalyst as well as a preparation method and application thereof, and belongs to the technical field of Fenton advanced oxidation. Trivalent iron ions, biazine rings and iron ions are introduced to form an azine ring-iron tridentate ligand compound while urea and melamine are subjected to thermal polymerization; tetramethylammonium chloride is added in the process of forming g-C3N4 through high-temperature polycondensation of the compound, so that methyl free radicals generated by decomposition of tetramethylammonium chloride react with g-C3N4 edge amino groups, and stable iron-doped quaternized graphite phase carbon nitride is obtained. The prepared catalyst has rich iron monatomic ligand active sites, widens the applicable pH range and greatly improves the catalytic activity, and meanwhile, due to the introduction of quaternary ammonium strong cation groups, the catalyst can adsorb cellulose and break the colloidal steady state of the cellulose, so that the catalytic activity of the catalyst is improved. The problems that traditional g-C3N4 and other iron-based catalysts are low in catalytic activity in papermaking wastewater, and catalytic active sites are easily covered by cellulose are solved.

Images