<p>In this paper a facile route was used to synthesize nitrogen-doped graphitic nitride nanodots for photocatalytic degradation of 2,4-dichlorophenoxyacetic acid (2,4-D). The so-proposed synthetic route enabled synthesis of spherical and well-dispersed nanodots through easy two-step method. Herein, hydrazine hydrate acted as nitrogen source for doping. The nitrogen doping was confirmed by XRD, XPS, and BET analysis. The nitrogen doping greatly enhanced the surface area of bulk graphitic nitride. The so-synthesized nanodots degraded 2,4-D in acidic medium. The nitrogen doping greatly enhanced photocatalytic activity as nitrogen atom provided electrons to graphitic nitride conjugated system. This photocatalyst degraded 65% 2,4-D (10&#xa0;ppm) in water in 210&#xa0;min. Upon irradiation of visible light irradiation, O₂⁻ was generated by the photocatalyst which degraded 2,4-D.</p>