Organically modified montmorillonite composited with magnetic glyoxal-chitosan Schiff base for reactive blue 19 dye removal: Process optimization and adsorptive mechanism

• Published in: International journal of biological macromolecules Vol. 256; no. Pt 2; p. 128463
• Main Authors: Abdulhameed, Ahmed Saud, Hapiz, Ahmad, Musa, Salis Auwal, Kashi, Elmira, Wu, Ruihong, ALOthman, Zeid A., Jawad, Ali H., Algburi, Sameer
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.01.2024
• Subjects: Chitosan; Organically modified montmorillonite; Schiff's base; Organically modified montmorillonite; Schiff's base; Chitosan
• ISSN: 0141-8130; 1879-0003
• DOI: 10.1016/j.ijbiomac.2023.128463

In this study, a new biocomposite magnetic adsorbent (magnetic glyoxal-chitosan Schiff base/organically modified montmorillonite (MCTS-GOX/OMMT)) was synthesized and employed for the adsorption of reactive blue 19 dye (RB19) from aqueous environment. The physicochemical properties of the MCTS-GOX/OMMT were confirmed by using various characterization techniques such as BET, XRD, FTIR, SEM-EDX, VSM, and pHpzc. The adsorption key variables were statistically optimized via Box-Behnken design (BBD) And accordingly the best operational conditions to achieve maximum RB19 removal were recorded at MCTS-GOX/OMMT dosage = 0.1 g/0.1 L, solution pH = 4, and working temperature = 25 °C. The adsorption process for RB19 appeared to follow the pseudo-second-order kinetic and the Langmuir isotherm models, according to the findings of the adsorption kinetics and equilibrium investigations. The maximum adsorption capacity of the MCTS-GOX/OMMT towards RB19 was 122.3 mg/g, demonstrating its preferable adsorption capability. The successful development of this novel magnetic bioadsorbent with excellent adsorption ability towards organic dyes and efficient separation ability opens possibilities for its practical application in wastewater treatment and dye removal processes. •A magnetic chitosan-glyoxal/organically modified montmorillonite (MCTS-GOX/OMMT) was synthesized.•MCTS-GOX/OMMT was employed for the removal of reactive blue 19 (RB19).•The adsorption process was optimized by using the Box-Behnken design (BBD).•The adsorption kinetics follows the pseudo-second-order model.•The adsorption capacity of the MCTS-GOX/OMMT was 122.3 mg/g.