Heterojunction material BiYO3/g-C3N4 modified with cellulose nanofibers for photocatalytic degradation of tetracycline

Cellulose nanofibers (CNFs) with large specific surface area and superb adsorption capacity are excellent pho-tocatalyst carriers. In this study, heterojunction powder material BiYO3/g-C3N4 was successfully synthesized for the photocatalytic degradation of tetracycline (TC). The photocatalytic material BiYO3/g-C3N4/CNFs was ob-tained by loading BiYO3/g-C3N4 on CNFs using electrostatic self-assembly method. BiYO3/g-C3N4/CNFs exhibit a fluffy porous structure and large specific surface area, strong absorption in the visible light range, and the rapid transfer of photogenerated electron-hole pairs. Polymer-modified photocatalytic materials overcome the disad-vantages of powder materials that are easy to reunite and difficult to recover. With synergistic effects of adsorption and photocatalysis, the catalyst demonstrated excellent TC removal efficiency, and the composite maintained nearly 90 % of its initial photocatalytic degradation activity after five cycles of use. The superior photocatalytic activity of the catalysts is also attributable to the formation of heterojunctions, and the hetero-junction electron transfer pathway was confirmed by experimental studies and theoretical calculations. This work demonstrates that there is great research potential in using polymer modified photocatalysts to improve photocatalyst performance.