Effective removal of perfluorooctanoic acid from water using PVA@UiO-66-NH2/GO composite materials via adsorption

• Published in: Journal of environmental management 2024-09, Vol.368, p.122248, Article 122248
• Main Authors: Van Thang, Vu, Tran Duy Nguyen, Nguyen, Nadagouda, Mallikarjuna N., Aminabhavi, Tejraj M., Vasseghian, Yasser, Joo, Sang-Woo
• Format: Article
• Language: English
• Subjects: Molecular adsorption; Perfluorooctanoic acid; PVA@UiO-66/GO; Water purification
• ISSN: 0301-4797; 1095-8630; 1095-8630
• DOI: 10.1016/j.jenvman.2024.122248

This study introduces an innovative approach using highly efficient nanocomposite materials to effectively remove PFAS from water, demonstrating remarkable adsorption capabilities. The nanocomposite was synthesized by integrating a zirconium-based metal-organic framework (MOF) called UiO-66 with graphene oxide (GO) within a polyvinyl alcohol (PVA) matrix. The resulting PVA@UiO-66/GO material features flower-like UiO-66 MOF crystals embedded in the PVA and GO matrix. Various kinetic models were applied to determine the rate constants and adsorption capacities, with the Langmuir isotherm indicating an adsorption capacity of 9.904 mg/g. Thermodynamic analysis confirmed the process's spontaneity and exothermic nature. The UiO-66-NH2/GO/PVA composite also demonstrated high reusability, maintaining substantial PFOA removal efficiency across multiple cycles, with optimal reduction occurring at approximately pH 5. Overall, the PVA@UiO-66/GO composites offer an effective, sustainable, and environmentally friendly solution for PFAS removal in water purification. •PVA@UiO-66-NH2/GO composites performed an efficient PFOA removal in water.•FTIR, XPS, TEM, TGA, and BET supported adsorption of PFOA onto the composites.•Adsorption kinetics was performed by fluorescence quenching of TCPP in PCN-222.•The pseudo-second-order kinetic model yielded R2 value of 0.9998.•Heterogeneous adsorption was identified by Freundlich and Langmuir isotherms.