Synthesized nanoparticles of poly (Styrene–alternative-maleic anhydride) and prunus cerasus rock used for removing Cadmium (II) ions from aqueous solutions

Chelating adsorbents have been considered to be suitable materials for the recovery of cadmium in water treatments. Adsorption of Cadmium (II) ions on melamine-butanedioic acid, modified poly (Styrene-alternative-maleic anhydride) cross-linked by ۱, ۲-diaminobutane (CSMA-MB) and pit shell of sour cherry (Prunus cerasus rock) (PCR) as an ion exchange adsorbents have been investigated in aqueous solution. The adsorption behavior of these Cadmium (II) ions on the adsorbents was studied by varying the parameters such as pH (۲-۸), adsorbent dose (۰-۴.۰ g/L-۱), contact time (۰‒۲۴۰ min), and Cadmium (II) ion concentration (۲۰-۳۰۰ mg/L-۱). Adsorption percentage was increased by increasing each of these parameters. The isotherm models such as Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich were used to describe adsorption equilibrium. The results showed that the best fit was achieved with the Langmuir isotherm equation, yielding maximum adsorption capacities of ۸۱.۳۰, ۸۰.۴۲ mg/g-۱ for Cd (II) with CSMA-MB and PCR respectively. Both adsorbents, CSMA-MB and PCR, are very suitable for the removal Cadmium (II) ions from aqueous solutions. The adsorbents were characterized by fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), x-ray diffraction analysis (XRD).