NÂNG CAO ĐỘ BỀN VÀ KHẢ NĂNG TÁI SỬ DỤNG CỦA CHẤT QUANG XÚC TÁC Ag3PO4 THÔNG QUA CẤU TRÚC MÀNG COMPOSITE VỚI POLYVINYL ALCOHOL
Tóm tắt
In this study, Ag3PO4 (APO) was combined with polyvinyl alcohol (PVA) in order to overcome two major limitations of pristine APO: the difficulty of recovery and the susceptibility to photocorrosion. APO/PVA composites were fabricated at different ratios (10:1, 20:1, 30:1, and 40:1) and characterized by XRD, Raman, SEM, and UV–Vis techniques. The results indicated that the PVA coating did not disrupt the crystal lattice structure of APO, while significantly influence on the particle morphology and optical properties. Photocatalytic tests for the degradation of methylene blue (MB) under simulated solar light revealed that APO/PVA-40/1 exhibited the highest activity, whereas APO/PVA-10/1 showed a slower degradation rate but demonstrated superior reusability and durability. After three cycles, APO/PVA-10/1 retained approximately 75% of its MB degradation efficiency, whereas pristine APO, although achieving nearly 100% degradation within 10 minutes in the first cycle, declined sharply to about 45% by the third cycle. Furthermore, the APO/PVA composite in film form could be easily recovered and reused without centrifugation or filtration. These findings confirmed that PVA provided a simple yet effective approach to enhance the practical applicability of APO, thereby opening a pathway for the development of “floating sheet” materials for real-world treatment of organic wastewater.
