Synthesis of g-C3N4/biochar materials for photocatalytic degradation of doxycycline in aqueous solution under visible light irradiation

Bui Thi Minh Nguyet; Nguyen Thanh Tuoi; Nguyen Van Hung

doi:10.62239/jca.2023.075

Authors

Bui Thi Minh Nguyet Dong Thap University Author
Nguyen Thanh Tuoi Lap Vo 2 high school, Tan My, Lap Vo, Dong Thap Author
Nguyen Van Hung Dong Thap University Author

DOI:

https://doi.org/10.62239/jca.2023.075

Keywords:

Graphitic carbon nitride, biochar, g-C3N4/biochar, photodegradation, doxycycline

Abstract

This study used reed biomass and urea as raw materials to produce biochar and g-C₃N₄ by pyrolysis under N₂ atmospheric conditions at 400^oC and 520^oC, respectively. The g-C₃N₄/biochar materials were prepared by dispersing different masses of g-C₃N₄ onto the biochar surface and characterized by XRD, SEM, BET, FT-IR and UV-Vis-DRS methods. The photocatalytic degradation on doxycycline (DC) was investigated from the factors of pH and concentration. The characterization showed that g-C₃N₄ was well incorporated on the surface of biochar and increased the specific surface area of the material. The presence of biochar narrowed the band gap and increased light absorption at a wider wavelength range of g-C₃N₄. The composite of g-C₃N₄/biochar ratio of 2/1 presented the best performance, which is 2.38 times faster than g-C₃N₄ degrading DC. Kinetic studies showed that DC degradation followed pseudo-first-order kinetics with a determined rate constant k_app = 4,82×10^-2min⁻¹ at a concentration of 5.0 mg/L DC. The study shows that the g-C₃N₄/biochar material has great potential in the treatment of antibiotic contaminated wastewater.

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