Abstract
Chitosan was utilized as adsorbent to remove methyl orange (MO) from aqueous solution by adsorption. Batch experiments were conducted to study the effects of pH, initial concentration of adsorbate and temperature on dye adsorption. The kinetic data obtained from different batch experiments were analyzed using both pseudo first-order and pseudo second-order equations. The equilibrium adsorption data were analyzed by using the Freundlich and Langmuir models. The best results were achieved with the pseudo second-order kinetic model and with the Langmuir isotherm equilibrium model. The equilibrium adsorption capacity (qe) increases with increasing the initial concentration of dye and with decreasing pH. The values of qe were found to be slightly increased with increasing solution temperatures. The activation energy (Ea) of sorption kinetics was found to be 10.41 kJ/mol. Thermodynamic parameters such as change in free energy (△G), enthalpy (△H) and entropy (△S) were also discussed.
Highlights
With economic and technological development, water pollution is a common problem in worldwide
Effect of pH In order to avoid solubilization of the chitosan in aqueous solution at very low pH [37], adsorption experiments were conducted with the pH ranging from 4.0 to 9.0
The calculated qe values obtained from the pseudo first-order kinetic model do not give reasonable values, which are too low compared with experimental qe values (Table 1). These results suggest that the adsorption of dye methyl orange (MO) onto the chitosan 10B is not a pseudo first-order reaction
Summary
With economic and technological development, water pollution is a common problem in worldwide. Water pollution has become more and more serious, especially regarding dye ions. Many recent studies have been focused on the development of efficient processes for the recovery of these organic contaminants from the effluents of textile industries [3,4,5]. Conventional techniques such as precipitation, coagulation and flocculation have been used in wastewater treatment these techniques are not very efficient for removing several common dyes, especially from dilute solutions [3]. The adsorption capacity of the adsorbents is not very effective; to improve adsorption performance new adsorbents are still under development
Sign-in/Register to view highlights & summary 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.
