New functionalized magnetite chitosan–heterocyclic nanocomposites excelling in Cd2+ removal from aqueous solution with biological activity

• DOI: 10.1007/s13201-024-02353-6
• Publication Date: 2025-01-25T09:01:14Z
• Authors: Safaa R. Fouda; Asmaa Abuessawy; Adel A.-H. Abdel-...; Hagar S.El-Hema; Mohamed N. Eisa; Mohamed A. Hawata
• Keywords: Magnetite Nanoparticles

Abstract Newly modified magnetic chitosan nanoparticles were synthesized for the high-efficiency removal of cadmium ions from aquatic environments. The structure and morphology composites confirmed using FTIR, TGA, XRD, BET, SEM, TEM, SAED pattern analysis, zeta potential. Under optimal conditions (pH = 6.0, contact time 120 min, sorbent dosage 0.005 g/100 mL), maximum Cd (II) by samples MC, SA, SB was 90.8%, 95%, 95.15%, respectively. kinetic data at pH 6 could be accurately described a pseudo-second-order equation, while Langmuir isotherm model best represented sorption process. Q max values nanocomposites S*, S3, S4, S*t, S3t, S4t 243.90, 250, 270.27, 212.76, 237.09, 238.09, thermodynamic analysis these shows that process exothermic (negative ∆H°) − 15.148, 13.60, 13.18, 18.163, 16.820, 16.06 kJmol −1 , This implies diffusion Cd(II) on decreased with temperature rise. positive ΔS⁰ 152.37, 147.80, 146.83, 160.94, 157.08, 154.93 antimicrobial properties functionalized sorbents SA evaluated measuring zone inhibition (ZOI) against Staphylococcus aureus Klebsiella pneumoniae, representing Gram-negative Gram-positive bacteria, showed promising activity, demonstrating clear zones (20 ± 0.2 18 0.4 mm), (22 20 mm) S. K. Additionally, demonstrated moderate antioxidant highest scavenging percentages 94.20% 96.63%, respectively, concentration 1000 µg/mL, as assessed DPPH method.