Microwave-assisted supramolecular double crosslinked chitosan-based molecularly imprinted polymer for synergistic recognition and selective recovery of Cd(II) and As(V) from water: Performance and mechanistic insights

• Published in: International journal of biological macromolecules 2024-11, Vol.281 (Pt 2), p.136263, Article 136263
• Main Authors: Hawash, Hamada B., Hagar, Mohamed, Elkady, Marwa F., Moneer, Abeer A., El-Qelish, Mohamed, El-Tahawy, Mohsen M.T., Kassem, Taher S.
• Format: Article
• Language: English
• Subjects: D-Crosslinked MIP; Integrative mechanisms; Metal ions removal; Recognition; Sustainable supramolecular polymer
• ISSN: 0141-8130; 1879-0003; 1879-0003
• DOI: 10.1016/j.ijbiomac.2024.136263

A novel model of the sustainable double crosslinked molecularly imprinted polymer (D-Crosslinked MIP) represented as a supramolecular imprinted polymer was synthesized via the bulk polymerization method. The primary crosslinking was fabricated using biomacromolecule chitosan as a functional monomer and glutaraldehyde as a crosslinker. The primary crosslinked was subjected to dynamic interactions in a secondary crosslinking by binding Al2O3-NPs and TiO2-NPs, forming the supramolecular D-Crosslinked-MIP. The dually crosslinked formed from combining three distinct crosslinkers in one system for the interaction with As(V) and Cd(II). A microwave was employed to evaluate the performance of the designed material in selectivity and extraction of metal ions from water. The FT-IR, XRD, TG/DTA, SEM-EDX, TEM, and XPS were used to verify the characteristics of (D-nano-Al2O3@Crosslinked Chitosan@D-nano-TiO2). The type of solvents, selectivity, interferences, microwave-contact time, pH, temperatures, concentrations, and regeneration were investigated. By using the D-Crosslinked-MIP, at 15 s, Cd(II) revealed a recovery capacity of 99.03 %, Qmax 862.07 mg/g, while As(V) demonstrated a recovery capacity of 99.06 %, Qmax 850.75 mg/g. The D-Crosslinked-MIP exhibited BETs of 69.01 m2/g with a pore volume of 0.2340 cm3/g owing to polymeric crosslinking by metal oxide NPs. The kinetics, isotherm models, and mechanisms of dually crosslinking and extraction of toxic metals were discussed. [Display omitted] •Synthesis of supramolecular D-Crosslinked MIP for extraction of Cd(II) and As(V)•The dually crosslinked polymer was confirmed and characterized using analytical methods.•Proposed mechanisms of crosslinking, recognition, and extraction were explained.•Studying recovery kinetics, thermodynamics, and isotherms modeling•Types of solvents, selectivity, interfering ions, and reusability were evaluated.