Investigation of Fluorine‐Doped Polymeric Graphitic Carbon Nitride for Photocatalytic Degradation of Oil‐Soluble Organic Dyes in Immiscible Oil‐Water Binary Systems

Biphasic catalytic systems enhance photocatalytic degradation by improving mass transfer and reaction kinetics, with polymeric carbon nitride (PCN) being a promising material despite limitations like charge recombination and poor interfacial compatibility. To address these issues, fluorine‐modified PCN has emerged as an effective solution, synergistically optimizing amphiphilicity and electronic structure for improved biphasic photocatalysis. The construction strategies for fluorine‐modified PCN (F‐PCN) primarily encompass in situ fluorine doping and surface fluorination. The stabilized Pickering emulsion photocatalytic system based on F‐PCN capitalizes on distinctive interfacial effects, enabling efficient enrichment and activation of hydrophobic organic pollutants in the oil phase while promoting rapid transfer of polar intermediates to the aqueous phase. This dynamic mass transfer process effectively mitigates product inhibition, providing critical insights for the development of advanced multiphase photocatalytic systems. In the photocatalytic degradation of Sudan red, the optimized F‐PCN catalyst demonstrated exceptional performance, achieving a degradation efficiency of 96.79% within 40 min. Furthermore, due to enhanced charge carrier separation and increased electron transport efficiency induced by fluorine modification, the photocurrent response intensity of F‐PCN was 3.2 times greater than that of pristine PCN, further confirming its superior photocatalytic performance.