Tris 2-aminoethyl amine (TREN) agent to quantify interaction and extraction capacity of VO2+ ions for oriented membrane processes

• Published in: Materials today : proceedings Vol. 45; pp. 7711 - 7717
• Main Authors: Touarssi, I., Oukkass, S., Habibi, Z., Chaouqi, Y., Sefiani, N., Lebrun, L., Hlaibi, M.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2021
• Subjects: Facilitated transport; Microscopic, macroscopic and activation parameters; TREN; Vanadium; TREN; Microscopic, macroscopic and activation parameters; Vanadium; Facilitated transport
• ISSN: 2214-7853; 2214-7853
• DOI: 10.1016/j.matpr.2021.03.334

In recent years, the development of functionalized synthetic or natural polymer membranes with good mechanical stability has increased considerably for applications in different extraction and separation membrane processes. The technique of oriented processes through affinity polymer membranes is often adopted for the extraction of rare and value-added metal ions. Different types of affinity polymer membranes have been developed by insertion or grafting of extractive agents such as TREN, to extract and recover VO2+ ions from acid solutions of industrial leaching in order to remedy the massive consumption of the metal vanadium. This research was carried out according to the facilitated transport of VO2+ ions from an acid medium through a polymer membrane functionalized with TREN. The impact and influence of the TREN agent, as well as its concentration on the morphology, porosity, composition, and performance of the developed PSU/PVP/TREN membrane were studied. Different techniques including FITR-ATR Spectroscopy, SEM and EDX Spectroscopy were employed to characterize the membrane. In the present work, the membrane developed and used has good stability and a long lifetime for carrying out the processes studied under hard conditions of acidity and temperature. The performance of the membrane was evaluated by calculating the macroscopic parameters, permeability P and initial flux J0. The apparent diffusion of VO2+ ions through the organic phase according to the formation and dissociation reactions of unstable entities (VO2+ -TREN) was determined by the evolution of microscopic parameters, apparent diffusion coefficient D* and association constant Kass. To justify the results obtained for the process studied, activation and thermodynamic parameters (energy Ea, enthalpy ΔH≠, entropy ΔS≠, and enthalpy ΔHth) were assessed. The evolution analysis of obtained values allows us to elucidate the kinetic or energetic aspects which control the mechanics of the studied processes and the performance of the adopted membrane.