Synthesis, characterization, and photocatalytic properties of reed biochar/TiO2 composites

Bui Thi Minh Nguyet; Nguyen Thanh Tuoi; Le Thanh Tuyen; Le Thi Thanh Thao; Nguyen Van Hung

doi:10.62239/jca.2024.032

Authors

Bui Thi Minh Nguyet Dong Thap University Author
Nguyen Thanh Tuoi Hue University of Sciences Author
Le Thanh Tuyen Hau My Bac A secondary school, Tien Giang, Viet Nam Author
Le Thi Thanh Thao Dong Thap University Author
Nguyen Van Hung Dong Thap University, Vietnam Author

DOI:

https://doi.org/10.62239/jca.2024.032

Keywords:

Titania, biochar, photodegradation, TiO2/biochar, doxycycline

Abstract

In this study, TiO₂/biochar (TBC) materials were successfully synthesized by simple hydrolysis. The photocatalytic activity of the products was evaluated through the photodegradation ability of doxycycline (DC) in aqueous solution. Characterization shows that TiO₂nanoparticles are well dispersed on the biochar surface. The presence of biochar helped improve the specific surface area, narrow the band gap and enhance the optical absorption in the visible light region of TiO₂. The TBC composite at TiO₂/biochar mass ratio = 1/0.25 showed the highest photodegradation efficiency, about 3.77 times higher than pure TiO₂. Kinetic studies showed that DC degradation followed an apparent first-order kinetic model with rate constant k_app = 2.66×10^-2 min^-1 at DC concentration of 7.0 mg/L. Research shows that TiO₂/biochar material has great potential for treating antibiotic-contaminated wastewater.

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