Abstract
In this study, a simple method for providing natural hydroxyapatite/chitosan (N-HAP/chitosan) composite is introduced and adsorption suitability of this composite for treating the solutions containing Cu(II) ions has been studied. Kinetic and isotherm studies were carried out by studying the effects of parameters such as adsorbent particle size, temperature and pH. The equilibrium data at different temperatures were analyzed by Langmuir and Freundlich isotherms. Equilibrium data agreed well with Langmuir isotherm, based on this model the maximum adsorption capacity of N-HAP/chitosan composite for Cu(II) was found to be 1.776mmol/g at pH 7.50 and 25°C for 47.6nm adsorbent particle size. A pseudo-second order kinetic model has been proposed to correlate the experimental data. The thermodynamic parameters such as standard Gibb's free energy (ΔG°), standard enthalpy (ΔH°), standard entropy (ΔS°) and activation energy (Ea) were evaluated by applying the Van’t Hoff and Arrhenius equations. The results reveal Cu(II) adsorption onto N-HAP/chitosan is spontaneous, has endothermic nature and is followed by physisorption.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of the Taiwan Institute of Chemical Engineers
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
