Recycling paper packaging waste into Fe-biochar pellet catalyst for tetracycline degradation via peroxymonosulfate activation
Recycling paper packaging waste into Fe-biochar catalysts is a promising strategy for resource utilization. In this study, a dissolution-regeneration method using a DMAc/LiCl system was employed to synthesis Fe-biochar pellet catalyst (Fe-WPBC) with corrugated cardboard as a cheap carbon precursor. The Fe-WPBC possessed a spherical cage-like hollow structure with millimeter-size dimensions, making it suitable for practical application. An impressive rate constant of 0.2452 min -1 for tetracycline degradation via peroxymonosulfate activation was achieved, and Fe-WPBC showed high stability, maintaining close to 100% tetracycline removal efficiency even after five cycles. Mechanistic insights were obtained through radical quenching, electron paramagnetic resonance, and electrochemical analysis etc. Both electron transfer path and SO 4 · - and O 2 · - dominated radical path concurrently existed. Possible degradation pathways were further proposed in combination with LC-MS and DFT calculations. Besides, toxicity simulations using T.E.X.T and ECOSAR programs showed that the degradation intermediates were less toxic than tetracycline. Finally, the practical application potential of Fe-WPBC was evaluated through a continuous flow reactor, which achieved a 99% tetracycline degradation efficiency and maintained over 400 min. This study provides new insights into both the recycling of paper packaging waste and the development of pellet catalysts for pollution degradation.
危险品化学品经营许可证（带存储）