Effective defluoridation using lanthanum-organic frameworks encapsulated hydrotalcite based bio-hybrid beads

Herein, hydrotalcite (HT) integrated lanthanum-metal organic frameworks (LaMOFs) cross-linked alginate and chitosan (Alg-CS) biopolymers that are HT-LaMOFs@Alg-CS beads was prepared and successfully utilized for defluoridation investigations. The prepared HT-LaMOFs@Alg-CS beads were evaluated with the help of various instrument analyses. The adsorption capacity of the prepared HT-LaMOFs@Alg-CS beads for fluoride retention was investigated, across a broad choice of pH levels, and in the occurrence of interfering ions identified in water. The batch optimized condition for fluoride adsorption using HT-LaMOFs@Alg-CS beads were contact time (30 min), pH 7, initial fluoride concentration (10 mg/L), dosage (0.1 g) at room temperature. The fluoride adsorption capacity of HT-LaMOFs@Alg-CS beads is 4905 mgF- kg-1 within 20 min. To distinguish the defluoridation behavior on HT-LaMOFs@Alg-CS bio-hybrid beads, the adsorption isotherm, kinetics, and thermodynamic studies were performed. Thermodynamic results suggest that the fluoride adsorption route on the developed HTLaMOFs@Alg-CS beads was endothermic process with spontaneous nature. The experimental data result of HTLaMOFs@Alg-CS bio-hybrid beads for fluoride removal was majorly fitted Langmuir isotherm and pseudo second-order kinetics. The reusability and real water sample examination results of the attained HTLaMOFs@Alg-CS hybrid beads for defluoridation was demonstrated that the prepared HT-LaMOFs@Alg-CS beads were regenerable nature with more fitting at field level.

Automated summary

In this study, HT-LaMOFs@Alg-CS beads with high fluoride adsorption capacity were prepared and evaluated under various conditions. Adsorption isotherm, kinetics, and thermodynamic studies were conducted, and the beads were found to follow Langmuir isotherm and pseudo second-order kinetics. The beads also showed regenerable nature and suitability for practical applications.