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Facile synthesis and physicochemical properties of oxygen-doped graphitic carbon nitride (O-g-C3N4) for efficient photocatalytic degradation of methylene blue

Gozzal SidrasulievaDepartment of Chemistry, National University of Uzbekistan, Tashkent, UzbekistanНуритдин КАТТАЕВDepartment of Chemistry, National University of Uzbekistan, Tashkent, UzbekistanХамдам АКБАРОВDepartment of Chemistry, National University of Uzbekistan, Tashkent, UzbekistanAltinay AytmuratovaDepartment of Chemistry, National University of Uzbekistan, Tashkent, UzbekistanSarbinaz UsnatdinovaDepartment of Chemistry, National University of Uzbekistan, Tashkent, UzbekistanJaykhun MamatovDepartment of Chemistry, National University of Uzbekistan, Tashkent, UzbekistanOtajonov OtajonovDepartment of Chemistry, National University of Uzbekistan, Tashkent, UzbekistanRayhona MuyassarovaDepartment of Inorganic, Physical and Colloidal Chemistry, Tashkent Pharmaceutical Institute, Tashkent, UzbekistanSadatdin TileubaevDepartment of Organic and Inorganic Chemistry, Karakalpak State University, Nukus, Uzbekistan

2026

Ochiq kirishOlmos

ABI

Annotatsiya

A metal-free oxygen-doped graphitic carbon nitride (O-g-C3N4) photocatalyst was synthesized via a facile one-step thermal polycondensation of melamine followed by ultrasonic dispersion. The obtained O-g-C3N4 exhibited a pseudo-layered structure and nanoscale morphology. The optical band gap was determined to be 2.64 eV, indicating visible-light activity. The photocatalytic performance was evaluated through the degradation of methylene blue under solar irradiation, achieving nearly complete degradation within 120 min. Kinetic analysis revealed that the process follows a pseudo-first-order model with a rate constant of 0.018 min–1. The enhanced photocatalytic activity is attributed to oxygen-induced modification of the electronic structure and improved charge separation. The results demonstrate that O-g-C3N4 is an efficient metal-free photocatalyst for wastewater treatment applications.

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Identifikatorlar

DOI: 10.32434/0321-4095-2026-167-4-30-42

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