Abstract
Drinking water disinfection processes have made remarkable contributions to keeping drinking water safe. However, these processes can lead to the formation of numerous harmful disinfection by-products (DBPs). Therefore, it is crucial to implement effective measures to minimize the production of DBPs. Herein, PET@PDA@NH2-MIL-53(Fe) (PNM) composite was successfully prepared via surface etching and solvothermal method. The material exhibited excellent photocatalytic activity for DBPs and their precursors at the photo-Fenton system formed by PNM and trace H2O2, which system achieved 99% degradation of 2,6-dichloro-1,4-benzoquinone (2,6-DCBQ) in 30 min, and more than 98% and 95% degradation of phenol and bisphenol A (BPA) in 60 min. The PNM shows more than 90% degradation of DBPs even in real water. Based on free radical trapping experiments, a possible catalytic mechanism was proposed. ·OH and holes were the main active species in the catalytic process. Meanwhile, using UPLC-QTOF and GC–MS to identify intermediate degradation products and Toxtree software to assess toxicity. The PNM maintained a degradation rate over 95% after 5 cycles which demonstrates a remarkable recyclability. This study achieves the reuse of waste PET and opens a new way in exploring the development of eco-friendly photocatalytic materials.
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