Chemical synthesis of polypyrrole film and its adsorption capacity for aromatic polycarboxylic acids |
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| Authors: | Mohamed Laabd Nouh Aarab Hafsa Chafai Mohammed Bazzaoui Maria Elamine Rajae Lakhmiri Abdallah Albourine |
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| Institution: | 1.Laboratory of Materials and Environment, Department of Chemistry, Faculty of Sciences,Ibn Zohr University,Agadir,Morocco;2.Laboratory of Chemical Engineering and Valorization of Resources, Faculty of Sciences and Technologies,Abdelmalek Essaadi University,Tangier,Morocco |
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| Abstract: | Polypyrrole (PPy) film was prepared via in-situ chemical polymerization of pyrrole monomer on the surface of red-clay-brick (RCB) substrate. The deposited PPy film was characterized and used as an adsorbent for removal of benzene polycarboxylic acids from aqueous solutions. The effects of solution pH, contact time, initial concentration, and temperature on the adsorption process were systematically investigated to find the optimum operating conditions. Adsorption kinetic data were best fitted by pseudo-second order kinetic model. The adsorption equilibrium data were most represented by the Freundlich isotherm model. The maximum adsorption amounts of Trimellitic, Hemimellitic, and Pyromellitic acids were 189.27, 177.26, and 203.31 mg/g, respectively. The thermodynamic studies indicate that the adsorption was an endothermic and spontaneous process. Also, the PPy-RCB film was successfully regenerated using sodium hydroxide solution. The regenerated PPy-RCB can be reused for more than four successive cycles with a low reduction in adsorption efficiency. |
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