Conceptualization and quantification of oriented membrane processes for recovering vanadium ions from acidic industrial discharges

• Published in: Journal of environmental chemical engineering Vol. 7; no. 6; p. 103182
• Main Authors: Touarssi, Imane, Mourtah, I., Chaouqi, Y., Kamal, O., Sefiani, N., Lebrun, L., Hlaïbi, M.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-12-2019
• Subjects: Heat vulcanization method; Mechanism by jumps; Nitrilotriacetic acid; Oriented membrane processes; Tris 2-aminoethyl amine; Vanadium ions; Vanadium ions; Heat vulcanization method; Oriented membrane processes; Nitrilotriacetic acid; Mechanism by jumps; Tris 2-aminoethyl amine
• ISSN: 2213-3437; 2213-3437
• DOI: 10.1016/j.jece.2019.103182

In the present research, polymer inclusion membranes with polyvinyl alcohol (as polymeric support), Tris 2-aminoethyl amine and nitrilotriacetic acid (as extractive agents), were developed according to heat vulcanization method and characterized by Fourier-transform infrared spectrometry and scanning electron microscopy techniques. The as-synthesized membranes can be used for the extraction and recovery of VO2+ ions from highly acidic discharges of phosphate industries. Macroscopic parameters,viz., permeability (P) and initial flux (J0), were experimentally measured in order to evaluate the performances of the developed membranes. Similarly, microscopic parameters, viz., association constant (Kass) related to the interaction of the substrate (VO+2 ions) with extractive agents and apparent diffusion coefficient (D*) related to the migration of VO2+ ions through the membrane phase, were also determined. Further, the influences of temperature on the extraction process were examined, and the activation parameters, viz., energy (Ea), enthalpy (ΔH≠), and entropy (ΔS≠), were determined.
The obtained results elucidated that the proposed oriented processes occurred due to successive jumps of VO2+ ions from one interaction site to another of each extractive agent in the membrane phase. Finally, the parameter values of thermodynamic enthalpy (ΔHth) and activation dissociation enthalpy (ΔH≠dis) indicated an energetic control for the studied oriented processes through adopted membranes.