Synthesis of polyacrylonitrile- co -sodium methallyl sulfonate copolymer (AN69) and polyacrylic acid (PAA) membranes for
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Synthesis of polyacrylonitrile‑co‑sodium methallyl sulfonate copolymer (AN69) and polyacrylic acid (PAA) membranes for the removal of methylene blue from water Chamekh M’Bareck1 · Ely Cheikh S’Id1,2 · Abdelmoula Kheribech2 · Abdelaziz Elouahli2 · Zineb Hatim2 Received: 20 August 2019 / Revised: 31 October 2019 / Accepted: 14 November 2019 © Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract The scope of this work is focused on the removal of methylene blue (MB) from aqueous solution by adsorption (bach method) on polyacrylonitrile-co-sodium methallyl sulfonate copolymer (AN69) and polyacrylic acid (PAA) synthetic membranes which were prepared specifically for this purpose. Investigations have covered membrane properties and the determination of adsorption parameters. The immobilization of PAA chains into AN69 matrix was revealed by FTIR analysis, whereas the presence of small superficial microcavities was demonstrated by AFM scanning. Otherwise, the increase in PAA fraction (0 to 10%), in membrane composition, induces an increase in swelling ratio (12–22%) and ionic exchange capacity (0.8–1.2 meq/g). Moreover, the equilibrium adsorption capacity improves with the increase in alkalinity of initial adsorbate solution (pH = 2–11) and with the concentration (C = 20–80 mg/L). The results of kinetic adsorption show that the mechanism of adsorption is perfectly fitted by pseudo-second order (R2 = 0.999) and the isotherm adsorption follows the Freundlich isotherm (R2 = 0.98). From the different applied adsorption models, it was found that the maximum Langmuir adsorption capacity Qm was 116 mg/g and the Freundlich index of adsorption n was 2.2. Keywords Membrane · AN69 · PAA · Adsorption · Water treatment · Methylene blue
* Chamekh M’Bareck [email protected] 1
Research Unit: Polymères, Procédés Et Milieux Aquatiques (2PMA), BP. 5026, FST, University of Nouakchott, Nouakchott, Mauritania
2
Laboratory of Water and Environment (Team: Biomaterials and Electrochemistry), FS, Chouaib Doukkali University, El Jadida, Morocco
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Polymer Bulletin
Introduction With the progress of industrialization and the demographic rapid increase, many countries are exposed to serious drinking water problems [1]. This precious source is rarely available and exposed to various contaminants even after its treatment. Toxic components not only affect the quality of supplied water but also the equilibrium of aquatic system and all environment compartments [2–5]. For many decades, adsorption processes were successfully used to resolve the deterioration of water quality which is caused by the presence of various contaminants such as dyes, phenols, pesticides, pharmaceutical drugs, and inorganic compounds [6]. Methylene blue (MB) is a toxic compound with low molecular weight [7–10]. Often, it is used as a model to test materials’ efficiency in the removal of organic toxic compounds. In these recent years, different materials were tested to remove MB from aqueous solution. Abdelrahman et al. [11] used a
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