Abstract
Abstract In this paper influence of alginate encapsulation on point of zero charge (pHpzc) and thermodynamic properties of the natural and Fe(III)- modified zeolite were investigated. The pHpzc was determined by using 0.1000 g of the samples and 50 cm3 of the solution containing KNO3 in concentrations of 0.0001–0.01 mol/dm3 for initial pH (pHi) in range between 2 and 12. The obtained pHpzc were 6.2 for natural (NZA) and 6.5 for modified zeolite encapsulated with alginate (FeA). Influence of the temperature on the adsorption of lead was investigated for different initial lead ions concentrations (180–3200 mgPb2+/dm3) and temperatures of 30, 40 and 60oC. For both adsorbents, adsorption of lead ions increased with increasing its initial concentration as well as with increasing of the temperature. Also, the best fits of the experimental data were obtained by Freundlich isotherm. The temperature had positive influence adsorption and removal of lead ions increased with increasing its initial concentration as well as with increasing of the temperature. The thermodynamic parameters (the standard free energy of adsorption, standard enthalpy and standard entropy ) were also determined. The results showed that lead ions removal from aqueous solutions is much favourable for FeA then NZA.
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 callDisclaimer: 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.
