Graphene oxide@Fe3O4-decorated iota-carrageenan composite for ultra-fast and highly efficient adsorption of lead (II) from water

• Published in: International journal of biological macromolecules 2023-12, Vol.253, p.127437-127437, Article 127437
• Main Authors: Omer, Ahmed M., El-Sayed, Mohamed, Abd El-Monaem, Eman M., El-Subruiti, Gehan M., Eltaweil, Abdelazeem S.
• Format: Article
• Language: English
• Subjects: Carrageenan; Graphene oxide; Magnetic composite; Pb2+ removal; Regeneration
• ISSN: 0141-8130; 1879-0003
• DOI: 10.1016/j.ijbiomac.2023.127437

The aggravated problem of lead pollution, especially in aquatic environments, necessitates the development of eminent adsorbents that could radically solve this environmental problem. Hence, a new composite was constructed based on iota carrageenan (i.Carr), graphene oxide (GO) and magnetite (Fe3O4) for removing noxious Pb2+ ions. The [e-mail] composite was characterized by VSM, SEM, XPS, XRD, FTIR and Zeta potential. The removal of Pb2+ ions attained a quick equilibrium of almost 30 min with a removal efficiency reaching 93.68 %. The removal of Pb2+ was boosted significantly, in the order of [e-mail](1:1) > [e-mail](1:3) > [e-mail](3:1). Moreover, acquired experimental data fitted the pseudo 2nd order kinetic model and Freundlich isotherm model with a maximal monolayer adsorption capacity reached 440.05 mg/g. Notably, after five adsorption runs, the composite maintained its removal efficiency exceeding 74 %. The assumed adsorption mechanisms of Pb2+ onto [e-mail] were complexation, precipitation, Lewis acid-base, and electrostatic attraction forces. Overall, the [e-mail] composite elucidated the auspicious adsorbent criteria, comprising fast adsorption with high performance, ease-separation and tolerable recyclability, advising its feasible use to decontaminate water bodies from hazardous heavy metals. [Display omitted] •[e-mail] composite was fabricated for fast adsorption of lead (II) ions.•The composite displayed high magnetic property and high negative surface charges.•Maximum removal efficiency reached 89 % within 10 min.•The adsorption capacity reached 454.6 mg/g with better reusability for five cycles.•Results were evidenced using isotherms, kinetics and thermodynamics studies.