Enhanced fluoride adsorption and regeneration efficiency of cross-linker-free mesoporous hydroxyapatite/chitosan nanocomposites

The presence of F? ions in water is either a helpful or harmful outcome, contingent upon the concentration level pollutant. In this work, hydroxyapatite/chitosan (HAp/CS) nanocomposites were prepared incorporating varying weight percentages chitosan with HAp, using co-precipitation followed by lyophilization without employing any cross-linking agents for adsorption ions. An increase HAp matrix significantly enhanced colloidal stability, ion capacity, and reduced particle size (length 38% width 86%) when compared to HAp. respective maximum capacity HAp/CS1, HAp/CS2, HAp/CS3, HAp/CS4 56 mg/g, 80 82 100 mg/g at pH 7, which was considerably higher (10 times) than other existing reports. isotherm kinetics HAp/CS nanocomposite adsorbent confirmed monolayer strong chemisorption mechanisms. surface morphology after changed from rod sphere along an size, as HR-TEM. Moreover, FTIR XPS analysis revealed interaction between through exchange electrostatic interaction, lead formation fluorapatite. showed 2.5 times sustainable regeneration efficiency (90% 30 min) up 7th cycle Furthermore, solution (5–7) treated maintained neutral fluoride adsorption, rendering potable. Hence, these results demonstrate that plays significant role removal composite ideal applications.