Adsorption and mechanism study for methyl orange dye by cross-linked chitosan-ethylene glycol diglycidyl ether beads

• Published in: Desalination and Water Treatment
• Main Author: Jawad A.H.
• Format: Article
• Language: English
• Published: Desalination Publications 2019
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85071626745&doi=10.5004%2fdwt.2019.24511&partnerID=40&md5=e175a03ef6779c2aadbc21546174fcff

In this study, cross-linked chitosan-ethylene glycol diglycidyl ether beads (Chi-EGDEB) were prepared to be potential adsorbent for methyl orange (MO) dye removal from aqueous solution. Adsorption experiments were performed as a function of contact time (0–240 min), initial dye concentration (50–200 mg/L), and pH (3–10). The adsorption data of MO on the cross-linked Chi-EGDEB were in agreement with Langmuir and Freundlich isotherms. The adsorption capacity of the cross-linked Chi-EGDEB for MO was 112.4 mg/g at 303 K. The kinetic data were well described by pseudo-second-order kinetic model. The adsorption process was spontaneous and endothermic in nature. The mechanism of adsorption included mainly hydrogen bonding interaction, electrostatic attractions, and n–π stacking interaction. This study reveals that the cross-linked Chi-EGDEB as a good candidate for removal of acid dye from aqueous solution. © 2019 Desalination Publications. All rights reserved.