Removal of Acid Blue 80 from aqueous solutions using chitosan-based beads modified with choline chloride:urea Deep Eutectic Solvent and FeO

被引：27
作者：
Blanco L. [1 ]
Martínez-Rico O. [1 ]
Domínguez Á. [1 ]
González B. [1 ]
机构：
[1] Chemical Engineering Department, Universidade de Vigo
来源：
Water Resources and Industry | 2023年 / 29卷
关键词：
Acid blue 80; Adsorption; Anthraquinone dye; Chitosan-deep eutectic solvent beads; Textile pollution mitigation;
D O I：
10.1016/j.wri.2022.100195
中图分类号：
学科分类号：
摘要：
An alternative chitosan-based adsorbent modified by impregnation with deep eutectic solvent (DES) choline-chloride:urea at a molar ratio 1:2 proved efficient removal of the anthraquinone dye Acid Blue 80 (AB80) from aqueous solutions, and offered enhanced adsorption capacity compared to the starting materials. The adsorption was mainly affected by initial AB80 concentration, adsorbent dosage, contact time, and slightly influenced by temperature (25-45°C), and pH (3.5-10). The pseudo-second-order kinetic model fitted the experimental data, and pseudo-first order model fitted as well at the highest AB80 concentration, 250mg/L. The experimental data agreed with the Langmuir isotherm model, with a maximum adsorption capacity of 61.64mg/g at 35°C. The process was exothermic above 100mg/L of dye and spontaneous up to 200mg/L (T<35°C). The adsorbent could be reused without further treatment at least 5 times providing ≥40% removal, whereas the dye could be efficiently recovered by NaOH desorption. Electrostatic interactions as well as physisorption could explain the adsorption behavior. © 2022 The Authors.
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