Decorating graphene oxide with zeolitic imidazolate framework (ZIF-8) and pseudo-boehmite offers ultra-high adsorption capacity of diclofenac in hospital effluents. (May 2021)

• Record Type: Journal Article
• Authors: Arabkhani, Payam; Javadian, Hamedreza; Asfaram, Arash; Ateia, Mohamed
• Is Part Of: Chemosphere. Volume 271(2021)
• Publication Date: 2021-05
• Subjects: Graphene oxide -- ZIF-8 -- Diclofenac sodium removal -- Magnetic nanocomposite -- Simulated hospital effluent -- Ultra-high adsorption capacity; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2021.129610
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: This study reports on an easy and scalable synthesis method of a novel magnetic nanocomposite (GO/ZIF-8/γ-AlOOH) based on graphene oxide (GO) nanosheets decorated with zeolitic imidazolate framework-8 (ZIF-8), pseudo-boehmite (γ-AlOOH), and iron oxide (Fe3 O4 ) nanoparticles by combining solvothermal and solid-state dispersion (SSD) methods. The nanocomposite was successfully applied to remove of diclofenac sodium (DCF) – a widely used pharmaceutical – from water. Response Surface Methodology (RSM) was used to optimize the adsorption process and assess the interactions among the influencing factors on DCF removal efficiency; including contact time, adsorbent dosage, initial pH, solution temperature, and DCF concentration. Adsorption isotherm results showed a good fitting with the Langmuir isotherm model with an exceptional adsorption capacity value of 2594 mg g −1 at 30 °C, which was highly superior to the previously reported adsorbents. In addition, kinetic and thermodynamic investigations further illustrated that the adsorption process was fast (equilibrium time = 50 min) and endothermic. The regeneration of GO/ZIF-8/γ-AlOOH nanocomposite using acetic acid solution (10% v/v) after a simple magnetic separation was confirmed in five consecutive cycles, which eliminate the usage of organic solvents. The nanocomposite has also shown a superior performance in treating a simulated hospital effluent that contained various pharmaceuticals as well as other organic, and inorganic constituents. Graphical abstract: Image 1 Highlights: Magnetic GO/ZIF-8/γ-AlOOH-NC was synthesized for DCF removal from aqueous effluents. The reaction fitted pseudo-second-order kinetic model with an endothermic reaction. GO/ZIF-8/γ-AlOOH-NC showed high adsorption capacity of 2594 mg g −1 for DCF.