Adsorption and mechanism study for reactive red 120 dye removal by cross-linked chitosan-epichlorohydrin biobeads

• Published in: Desalination and Water Treatment
• Main Author: Jawad A.H.; Mubarak N.S.A.; Sabar S.
• Format: Article
• Language: English
• Published: Desalination Publications 2019
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85075297469&doi=10.5004%2fdwt.2019.24438&partnerID=40&md5=b5b1c94198484ae2202f17b1f9c34c4a

In this research, cross-linked chitosan-epichlorohydrin biobeads (CEB) were prepared to be potential biosorbent for reactive red 120 (RR120) dye removal from aqueous solution. Adsorption experiments were carried out as a function of contact time (0–600 min), initial dye concentration (30–400 mg/L), and pH (3–12). The adsorption data of RR120 on CEB were in agreement with Langmuir isotherm. The adsorption capacity of CEB for RR120 was 81.3 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 CEB as a promising biomaterial for removal of reactive dye from aqueous solutions. © 2019 Desalination Publications. All rights reserved.