Abstract
A polyazomethine poly-2,2’-hexamethylenebis(oxybenzaldehyde)-1,5-naphthalenediimine (PoHOBND) was prepared by polycondensation reaction of dialdehyde and 1,5-naphthlenediamine. The polymer was characterized through elemental microanalysis, FT-IR, 1HNMR, SEM, UV–Visible spectroscopy, fluorescence and thermal analysis. The polyazomethine (PoHOBND) showed violet colored fluorescence emissions and its thermal stability was up to 630˚C. The antimicrobial activities of the polyazomethine (PoHOBND) were also studied. An effective method was produced and employed at optimum conditions in remediation of Ni (II), Cu (II) and Co (II) from sewage wastewater samples and polyazomethine (PoHOBND) was used as sorbent. The sorption factors (adsorbate concentration, sorbent amount, shaking duration and pH) were optimized through multi-variant technique by using factorial design based on eighteen batch experiments. The metal ions present in wastewater were determined through AAS. The polyazomethine (PoHOBND) removed up to 77% Ni (II), 98% Cu (II) and 72% Co (II) from wastewater with RSD within 0.26–3.62%. The adsorption of Ni (II), Cu (II), and Co (II) on polyazomethine surface was confirmed through SEM images and EDX analysis. Kinetics and equilibrium of the adsorption were also examined. The sorption process of Ni (II), Cu (II), and Co (II) obeyed Langmuir isotherm with adsorption capacities of 25.64, 15.38 and 31.25 mg g−1 respectively and their kinetic results best suited to pseudo-second-order.
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Qureshi, F., Memon, S.Q., Khuhawar, M.Y. et al. Synthesis and application of fluorescent and thermally stable polyazomethine as adsorbent in the remediation of Ni (II), Cu (II) and Co (II) from wastewater systems. J Polym Res 28, 259 (2021). https://doi.org/10.1007/s10965-021-02582-2
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DOI: https://doi.org/10.1007/s10965-021-02582-2