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Facile construction of graphene oxide and iron organic frameworks decorated biopolymeric hybrid materials for fluoride uptake from water

2024; Elsevier BV; Volume: 350; Linguagem: Inglês

10.1016/j.seppur.2024.127921

1873-3794

Antonysamy Jeyaseelan, Natrayasamy Viswanathan, Mu. Naushad,

Esophageal and GI Pathology

The widespread excess level of fluoride in water causes a possible risk to human health. Herein, graphene oxide (GO) and iron-type metal–organic frameworks namely iron-benzene-1,4-dicarboxylate (Fe-BDC) namely GO/Fe-BDC was employed to remove fluoride in water. Because of powder form, GO/Fe-BDC creates pressure drop during filtration. To overcome such troubles and improve adsorption capacity, GO/Fe-BDC integrated alginate (Alg) and chitosan (CS) biopolymer-based hybrid material namely GO/Fe-BDC/Alg-CS beads was developed for fluoride removal. Defluoridation properties of GO/Fe-BDC and GO/Fe-BDC/Alg-CS beads were evaluated under numerous influencing conditions namely pH, contact time, variable fluoride concentration, co-ions, dosage and temperature studies. The GO/Fe-BDC and GO/Fe-BDC/Alg-CS beads revealed finer fluoride adsorption ability and also had high fluoride selectivity in complexed atmosphere with several co-ions. The element composition, crystal morphology and material morphology of GO/Fe-BDC and GO/Fe-BDC/Alg-CS beads were characterized using SEM, XRD, FTIR and EDAX analysis. The order and nature of defluoridation was examined with kinetics, thermodynamic and isotherm analysis. The highest r values and lowest sd values exhibit that Langmuir adsorption isotherm and pseudo-second-order models were consider as best fit models for fluoride adsorption process onto GO/Fe-BDC and GO/Fe-BDC/Alg-CS beads. The thermodynamic results illustrate that fluoride adsorption was spontaneous, chemical adsorption with endothermic nature involved. Electrostatic interaction and complexation were found as the primary defluoridation mechanism of GO/Fe-BDC and GO/Fe-BDC/Alg-CS beads. The renewal and field investigations of GO/Fe-BDC and GO/Fe-BDC/Alg-CS beads were explored to check their regeneration ability and field suitability nature.