Polymeric Matrix of Modified Chitosan with Algae and Coal Fly Ash for a Toxic Cationic Dye Removal: Multivariable Optimization by Box-Behnken Design

• Published in: Journal of Inorganic and Organometallic Polymers and Materials
• Main Author: Wu R.; Kashi E.; Jawad A.H.; Musa S.A.; ALOthman Z.A.; Wilson L.D.
• Format: Article
• Language: English
• Published: Springer 2024
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85207245595&doi=10.1007%2fs10904-024-03241-x&partnerID=40&md5=e621706cb8fd8c33ee46f79c1c620cb6

Herein, a composite adsorbent of chitosan/algae/coal fly ash (CS/Alg/FA) was synthesized to be an effective and renewable adsorbent for the removal of cationic dye (methyl violet 2B dye: MV2B) from synthetic wastewater. The physicochemical characteristics of CS/Alg/FA were assessed utilizing various analytical techniques, such as XRD, BET, FTIR, pHpzc, and SEM–EDX. The optimization of key adsorption variables [A: CS/Alg/FA dosage (0.02–0.1 g/100 mL), B: solution pH (4–10); C: contact time (20–180 min)] was carried out using the Box-Behnken design (BBD). Based on the BBD model, the optimal removal of MV 2B (78.4%) was achieved by employing a dosage of 0.1 g of CS/Alg/FA at a pH of 10 and a contact time of 100 min. The Langmuir isotherm model (coefficient of determination R2 = 0.94) provided a good fit for the empirical data, and the pseudo-second-order model accurately described the kinetic data. The maximum adsorption capacity (qmax) of CS/Alg/FA for MV2B was determined to be 63.4 mg/g at 25 ℃. The possible adsorption mechanism of MV 2B can be assigned to electrostatic attractions along with n−π, and H-bonding interactions. Thus, this comprehensive study underscores the potential of CS/Alg/FA as a preferable adsorbent for the removal of cationic organic dyes from industrial wastewater. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.