Abstract

Supalak Kongsri¹, Suchila Techawongstien² and Saksit Chanthai^1*

DOI : http://dx.doi.org/10.13005/ojc/310310

Fish hydroxyapatite (FHAp) was prepared from fish scale waste by alkaline heat treatment. The obtained nanoparticles (21 nm) of FHAp with high crystallinity (89.5%) were used as biocompatible adsorbent for an adsorption of plant carotenoids extract. For optimum conditions of batch adsorption study, experimental parameters including pH of solution, adsorbent dosage, an initial concentration of carotenoids, amount of sodium dodecyl sulfate (SDS), contact time and temperature were investigated in details. From the results, the carotenoids adsorption of the FHAp was drastically enhanced in the presence of SDS through their hydrophobic interactions between the carotenoids and the cationic element FHAp via the anionic head of SDS by electrostatic and ion-exchange interactions and surface complexation. The adsorption behaviors fitted well by pseudo-second order kinetic model and Freundlich adsorption isotherm. Thermodynamic data demonstrated that the adsorption behaviors of the carotenoids on the hydroxyapatite nanoparticles were spontaneously endothermic and physisorption process.

Hydroxyapatite; Fish scale waste; Carotenoid; Freundrich adsorption isotherm

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