Document Type : Research Paper
Laboratory of Materials Engineering for Environment and Valorization (GeMEV), Faculty of Sciences Chock, University Hassan II, Casablanca, Morocco
Laboratory of Research on Textile Materials (REMTEX), ESITH Casablanca, Morocco
In this study, two types of affinity polymer membranes containing new organometallic complexes (Gd-glucaric acid) as extractants were prepared and characterized. They were used to extract Cr (VI) ions from concentrated solutions (0.0068M–0.0009 M). These affinity polymer membranes were tested by designing an easier extraction process from the substrate at different concentrations and different temperatures. Additionally, macroscopic parameters such as permeability (P) and initial flux (J0) were evaluated to explain the extraction process of the substrate using these membranes. The results showed that the value of the initial flux (J0) of the extracted substrate was related to its initial concentration C0 by the saturation law, which allowed determining the microscopic parameters, the apparent diffusion coefficient (D*), and the substance formed (substrate-extraction agent) along with its constant correlation (Kass). The substrate factors and the temperature significantly affected the evolution of these parameters and the performance of the membrane during extraction. The activation parameters (Ea, ΔH≠, and ΔS≠) were determined, and the results indicated that the high performance of these types of membranes is related to the use of advanced techniques. The efficiency was related to the movement properties of the substrate through the organic phase and the structure of the membrane. The membranes developed were used to conduct experiments related to selective extraction and removal of chromium ions from a mixture containing Ni (II) ions. The results of these tests were conclusive and indicated a co-transport of Cr (VI) and Ni (II) ions, along with a marked reduction in the values of P and J0, which enhanced the performance of the membrane.