Effectiveness of waste-derived MIL type MOFs in removing PFOA and PFAS pollutants for environmental remediation
Mohamed A. Ismail, Anmar Ghanim Taki, Satish Kumar, Saad Sh. Sammen, Abdelfattah Amari, Arunkumar Bongale, Özgür Kişi, Ali Salem
Abstract
Abstract Elimination of perfluorooctanoic acid (PFOA), a persistent pollutant that is toxic to human and ecosystem health, is important. In this study, three adsorbents, C-101, W-101, and NW-101, were evaluated. W-101 was modified by diamine ethyl modification to enhance the number of PFOA adsorption sites. The results showed that W-101 (42.7 mg g −1 ) had better PFOA adsorption capacity than C-101 (12.3 mg g −1 ), and NW-101 (698.4 mg g −1 ) was the best. The Langmuir model correctly described the isotherms of PFOA adsorption, and the pseudo-second-order kinetic model fitted the process. NW-101 exhibited an excellent adsorption efficiency, as it reached the equilibrium within 7 min, and also revealed higher reusability due to the stable structure of the amine-grafted structure; therefore, NW-101 proved very efficient in PFOA removal. The new method used the bark of poplar trees to prepare MIL-101(Cr) adsorbents with surface areas of 3341, 2767, and 2374 m 2 g −1 for C-101, W-101, and NW-101, respectively. This cost-effective, eco-friendly method utilizes renewable raw materials, minimizes environmental impact, and represents a significant advance in PFOA removal and thermal material research.