Ethylenediamine-functionalized Zr-based MOF for efficient removal of heavy metal ions from water. (February 2021)

• Record Type: Journal Article
• Authors: Ahmadijokani, Farhad; Tajahmadi, Shima; Bahi, Addie; Molavi, Hossein; Rezakazemi, Mashallah; Ko, Frank; Aminabhavi, Tejraj M.; Arjmand, Mohammad
• Is Part Of: Chemosphere. Volume 264(2021)Part 2
• Publication Date: 2021-02
• Subjects: Metal-organic framework -- Functionalization -- UiO-66 -- Adsorption -- Heavy metals; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.128466
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Ethylenediamine-functionalized Zr-based metal-organic framework (MOF, UiO-66-EDA) was prepared via Michael addition reaction to investigate its potential for adsorption of heavy metal ions from water. Specifically, the influence of agitation time, solution pH, the dosage of the adsorbent, initial metal ion concentration, temperature, and coexistence of other metal ions was investigated on the removal efficiency of UiO-66-EDA towards Pb(II), Cd(II), and Cu(II) metal ions. The pseudo-second-order kinetic model governed the adsorption of these ions onto the UiO-66-EDA. Langmuir isotherm model matched the experimental isotherm of adsorption with a maximum adsorption capacity of 243.90, 217.39, and 208.33 mg/g for Pb, Cd, and Cu ions, respectively. The adsorption of Pb, Cd, and Cu ions onto UiO-66-EDA was dependent on electron exchange, electron sharing, electrostatic and covalent interactions between the metal ions as well as the abundant functional groups on UiO-66-EDA surface. Thermodynamic parameters such as free energy changes (ΔG), standard enthalpy changes (ΔH), and standard entropy changes (ΔS) were calculated, which revealed spontaneous and endothermic nature of the adsorption process. The UiO-66-EDA was stable and recyclable during adsorption studies of Pb, Cd, and Cu ions, suggesting its potentiality as an adsorbent for heavy metals recovery. Graphical abstract: Image 1 Highlights: Enhancement of adsorption of heavy metals by functionalization with polar compounds. UiO-66-EDA was stable, which can be regenerated by simple washing. UiO-66-EDA exhibited high adsorption capacity (243.90 mg/g) for lead ions. The electron exchange, sharing, and covalent interactions are the main adsorption mechanisms.