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| Upcycling PET microplastics via alkaline hydrolysis to defective iron metal-organic frameworks for water treatment |
| JIANG Wen-bin1, JIANG Chen-chen1, WEI Xuan-xiang1, XU Li-cong1, WANG Shan-li1, HASAN Md-Shahib1, WU Ming-hua1,2, YU De-you1,2 |
1. MOE Engineering Research Center of Ecological Dyeing and Finishing Technology, College of Textile Science &Engineering(International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou 310018, China;
2. Zhejiang Sci-Tech University Tongxiang Research Institute, Tongxiang 314500, China |
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Abstract In order to effectively remove polyetylene terephthalate (PET) microplastics, the PET microplastics were alkaline hydrolysed and upcycled to defective iron metal organic frameworks (Fe-MOFs) for the treatment of printing and finishing wastewater. The results showed that the removal rate of PET microplastics reached 100% with 97.4% yield of sodium terephthalate (Na2TPA) at the conditions of 2mol/L NaOH, 120℃ hydrolysis temperature of, and 120min reaction time.. Two facile methods using PET microplastics hydrolysates as precursors were developed for the preparation of defective Fe-MOFs catalysts. Scanning electron microscopy (SEM), powder X-ray diffractometer (XRD), Fourier transform-infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS) techniques were employed to characterize the morphologies, crystal structures, molecular structures, and elemental compositions of resultant catalysts. Finally, their catalytic ozonation performances was further evaluated and compared by the degradation of AO-7. The results revealed that D-Fe-MOF could completely remove AO-7 within 3 min at a degradation rate constant of 0.926 min-1, which was 3.6 and 7.3-fold times higher than those of W-Fe-MOF and ozonation alone process.
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Received: 24 February 2024
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