Van Hung, et al (2024) Visible-light-driven photocatalytic degradation of doxycycline using TiO2/g-C3N4/biochar catalyst. Materials Research Express. DOI 10.1088/2053-1591/ad4776
In a recent study published in Materials Research Express, researchers have developed a novel TiO2/g-C3N4/biochar (TCNBC) catalyst for the visible-light-driven photocatalytic degradation of doxycycline, a commonly used antibiotic. This innovative catalyst demonstrates high efficiency and stability, offering promising applications for environmental remediation.
Antibiotics like doxycycline are frequently detected in various natural environments due to their widespread use and resistance to traditional biological and chemical treatments. Their persistence poses significant risks, including the development of antibiotic-resistant bacteria, which threaten human health and ecosystems.
The TCNBC catalyst is composed of titanium dioxide (TiO2), graphitic carbon nitride (g-C3N4), and biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More derived from the pyrolysisPyrolysis is a thermochemical process that converts waste biomass into bio-char, bio-oil, and pyro-gas. It offers significant advantages in waste valorization, turning low-value materials into economically valuable resources. Its versatility allows for tailored products based on operational conditions, presenting itself as a cost-effective and efficient More of Phragmites australis, a common reed. The synthesis process involves hydrolysis of a mixture containing TiOSO4, g-C3N4, and biochar under alkaline conditions. This method ensures a synergistic effect, enhancing the photocatalytic activity beyond that of pure TiO2 or g-C3N4 alone.
Experimental results reveal that TCNBC exhibits superior photocatalytic activity compared to its individual components. The catalyst achieved a doxycycline decomposition efficiency of 91.93% and a mineralization efficiency of 81.50% under visible light. Moreover, TCNBC maintained a high degradation efficiency (86.30%) even after four recycling cycles, indicating its stability and reusability.
The enhanced performance of TCNBC is attributed to the synergistic effects between its components. Biochar not only provides a large specific surface area and porous structure but also participates in electron transport, reducing charge recombination rates. The heterojunction between TiO2 and g-C3N4 facilitates efficient separation of photogenerated electron-hole pairs, further improving the degradation process.
This study highlights the potential of using biomass-derived materials like biochar in developing effective photocatalysts for wastewater treatment. The TCNBC catalyst offers a sustainable and efficient solution for degrading persistent organic pollutants, contributing to cleaner water sources and a healthier environment.
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