Effective Adsorption of Methyl Orange from Aqueous Solution Using MOFs Nanocomposites UiO-66-NH<sub>2</sub>/GO@PVA
Vu Van Thang, Nguyền Trân Nguyễn, Phi Long Nguyen, Thi Viet Bac Phung
Abstract
High Resolution Image Download MS PowerPoint Slide The persistent contamination of water resources by synthetic dyes poses a critical global environmental challenge, necessitating the development of efficient and sustainable remediation technologies. This study presents a novel UiO-66-NH 2 /GO/PVA composite for the effective removal of methyl orange (MO) from water solutions. The composite was created by combining graphene oxide (GO) and UiO-66-NH 2 in a poly(vinyl alcohol) (PVA) matrix, creating a stable and very porous structure. Adsorption studies, fitted to the Langmuir isotherm model ( R 2 = 0.9439), revealed a maximum capacity of 188.63 mg/g, with an optimal removal efficiency of 99.6% achieved at an initial MO concentration of 100 mg/L and pH 5. Kinetic analysis confirmed a pseudo-second-order mechanism ( R 2 = 0.9930), indicating chemisorption as the dominant process, while thermodynamic data confirmed the adsorption as both endothermic and spontaneous. The material demonstrated robust reusability, retaining over 95% efficiency after four regeneration cycles. These findings position UiO-66-NH 2 /GO@PVA as a promising, eco-friendly adsorbent for wastewater treatment, with future research planned to evaluate its performance in real or simulated wastewater systems, addressing practical applicability.