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In the current work, we have doped g-C₃N₄ (GCN), a conjugated polymer based on heptazine-group with phosphorous and synthesized phosphorous doped g-C₃N₄ (PCN) has been coupled with CNT to enhance its photodegradation activity. Herein, CNT/PCN nanocomposites (having different CNT wt% i.e. 0.01, 0.02 and 0.03) were successfully fabricated via straight forward sonochemical method while GCN and PCN were prepared through direct thermal polycondensation method for Imidacloprid (IMI) pesticide degradation. Photodegradation activity of nanocomposite was enormously affected by doping but more significantly by nature of CNT content and addition of H₂O₂. EIS and PL analysis confirmed enhanced photogenerated charge carriers separation in CNT/PCN nanocomposite than GCN and PCN. Through BET analysis increase in surface area (S_BET) of CNT/PCN nanocomposite was observed than …