The synthesis of crosslinked carboxymethyl k-Carageenan ion printed coated nano-magnetite as Pb(II) adsorbent.

This research was conducted to synthesise Magnetic Solid Phase Extraction (MSPE) adsorbent to adsorb Pb(II) ions. The MSPE adsorbent consists of a magnetic part as a core and a coating as an analyte-binder. This research aimed to synthesise carboxymethyl kappa-carrageenan (CMKC) coated nano-magnetite, which was crosslinked with bisphenol A diglycidyl ether (BADGE), as Pb(II) ion adsorbent. This research was conducted in several stages, which were a synthesis of nano-magnetite and its physicochemical characterisation using SEM, FTIR, and XRD instruments; CMKC synthesis and characterisation by FTIR; synthesis of Pb(II) ion-imprinted BADGE-coated CMKC-coated nano-magnetites and its characterisation using FTIR, SEM, and XRF instruments, and tested its adsorption ability to Pb(II) ions. The synthesised magnetite has a size of 28 nm; the formation of magnetite was confirmed by the absorption peak in the FTIR spectrum resulting from the synthesis of magnetite, typical Fe-O peaks at 581.35 cm-1 and 443.5 cm-1. The synthesised magnetite diffractogram was identical to the Fe₃O₄ diffractogram. CMKC was successfully synthesised, confirmed by the appearance of the absorption peak of the C=O group at wave numbers 1604 cm⁻¹ and 1443 cm⁻¹, which showed asymmetric and symmetrical vibrations of the –COO-group in the FTIR spectrum, indicating a carboxyl group. The adsorbent in the form of CMKC-coated nano-magnetite cross-linked with BADGE, printed with Pb(II) ions, was successfully synthesised; the surface of the adsorbent is rough, porous and pleated, FTIR spectrum of the adsorbent, showed that crosslinking and mould formation caused the C=O asymmetric vibration peak to shift to 1650 cm-1. The adsorbent has the adsorption ability (Kads) to Pb(II) ions of 0.156 mg Pb(II)/g adsorbent. [ABSTRACT FROM AUTHOR]