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Preparation of crosslinked polyacrylamide hydrogels and their application to the removal of manganese (ii) ions from aqueous solution

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Mathieu Béné, Domga, Jean Marie Dikdim Dangwang, , Richard Domga, Jean Bosco Tchatchueng, Nathalie Kobbe-Dama and Simplice Tatsimo

Modified crosslinked polyacrylamide hydrogels having different functional groups were prepared by transamidation reaction using thiosemicarbazide (TSC) and benzene-1,4-diamine (BEN) as amine compounds while N,N’-methylene-bis-acrylamide was used as crosslinking agent. Viscosimetric measurements showed that the resins obtained namely Poly[N-(thiosemicarbazid)-acrylamide] (PAMTSC) and Poly[N-(4-aminobenzyl)-acrylamide](PAMBEN) have average molecular masses of 463818, and 511887 g.mol-1, respectively. Then they were used as adsorbent for the removal of Manganese (II) from aqueous solutions under varying conditions of contact time, adsorbent mass, pH and initial concentration. The both chelating resins showed a high speed of adsorption less than 5 minutes attributed to their porous nature. The application of the kinetics models of pseudo-first order, pseudo-second order, and the intraparticle diffusion model on experimental data showed that the adsorption of Mn2+ is best fitted the pseudo-order model for the two chelating resins. The study of Freundlich and Langmuir isotherms models showed that the latter model describe well experimental data both for (PAMTSC) and (PAMBEN). The mono layer adsorbed amount of Mn2+calculated from Langmuir model were 37.04 mg.g-1 and 12.82 mg.g-1 for the PAMTSC and the PAMBEN, respectively.The results suggested that polyacrylamide produced could be used as potential adsorbent for removal of heavy metals ions from aqueous solution.

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