Removal of Heavy Metal Ions from Aqueous Solutions Using Modified Poly(styrene-alt-maleic anhydride) Copolymer as a Chelating Resin

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the work, 3-(4-hydroxy phenyl)cyclopropane-1,1,2,2-tetramethyleneamine (HPCA) was synthesized. Poly(styrene-maleic anhydride) (SMA) copolymer was modified with HPCA and subsequently the product (SMA–HPCA) reacted with 1,2-diaminoethane (DAE) for preparation of tridimensional chelating resin (CSMA–HPCA) as a new copolymer with multiprimary amines cyclopropane functionalities in the pendant group and applied to remove heavy metal ions such as Cu(II), Pb(II), Zn(II) from aqueous solution. The adsorption behavior of selected metal ions was investigated by synthesized resins in various experimental conditions, under change in pH, metal ion concentration, and contact time. The CSMA–HPCA showed a high tendency for removing the selected metal ions compared to SMA–HPCA and the affinity order was: Cu(II) > Zn(II) > Pb(II). Kinetics studies revealed that the adsorption process onto CSMA–HPCA followed the pseudo-second order kinetics and adsorption experimental data were well fitted to Langmuir isotherm. The synthesized resins and their metal chelates were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), gravimetry, UV- Vis spectroscopy, and atomic absorption techniques (AAS).