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2021-12-22 - Article/Dans un journal avec peer-review - Anglais - page(s) (Soumise)

Bernardi Marie , Hantson Anne-Lise , Caulier Guillaume , Gossuin Yves , "Cu2+, Cr3+, Mn2+ and Ni2+ removal by Amberlite IR120: a study by benchtop nuclear magnetic resonance." in Hydrometallurgy

  • Edition : Elsevier (Netherlands)
  • Codes CREF : Physique du spin (genre RMN) (DI1234)
  • Unités de recherche UMONS : Physique biomédicale (M104)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux), Institut des Sciences et Technologies de la Santé (Santé)
Texte intégral :

Abstract(s) :

(Anglais) Water pollution by heavy metals is a major environmental concern. The removal of these metals from water is often performed by ion exchange. Currently the performances of ion exchange resins are determined through the measurement of metal concentration in the effluent thanks to Atomic Emission Spectroscopy (ICP-AES). In this research, the paramagnetic properties of some metallic ions often present in wastewater (Cu (II), Cr (III), Mn (II) and Ni (II)) are used to follow their ion exchange. Indeed, paramagnetic ions are known to affect the Nuclear Magnetic Resonance (NMR) relaxation times of water protons, which can be measured by benchtop NMR relaxometry. First, batch experiments were performed to study the metal ions uptake by Amberlite IR120 resin whose physicochemical properties were characterized by Fourier-Transform Infrared spectroscopy, scanning Electron Microscopy and Energy Dispersive X-Ray imaging. The effect of contact time, agitation speed, pH, dosage of resin and concentration of heavy metals on the removal efficiency were studied with NMR relaxometry. Pseudo-first and pseudo-second order kinetic models were used to analyze the kinetic data. Equilibrium isotherm of divalent ions are satisfactorily described by the Langmuir model. Chromium isotherm seems to obey the Freundlich model. The longitudinal and transverse relaxation of the wet resin are shown to be biexponential. The relaxation rate of the fast-relaxing water fraction of the wet resin can be correlated with the metal content obtained by ICP-AES. In the future, it will be interesting to carry out an NMR mini-column experiment to follow the loading of resin in real-time.

Identifiants :
  • FNRS : T.0113.20