Chitosan/montmorillonite composites for fast removal of methylene blue from aqueous solutions

被引：79
作者：
El-Kousy, Salah M. [1 ]
El-Shorbagy, Hadeel G. [2 ]
Abd El-Ghaffar, M. A. [3 ]
机构：
[1] Menoufia Univ, Fac Sci, Chem Dept, Menoufia, Egypt
[2] Al Menoufia Water & Wastewater Co, Water Qual Audit Dept, Menoufia, Egypt
[3] Natl Res Ctr, Dept Polymers & Pigments, Cairo, Egypt
来源：
MATERIALS CHEMISTRY AND PHYSICS | 2020年 / 254卷
关键词：
Chitosan; Nano-montmorillonite; Composite; MB; Adsorption; MUSSEL-INSPIRED CHEMISTRY; FUNCTIONALIZED CARBON NANOTUBES; REACTIVE BLACK 5; FACILE PREPARATION; ADSORPTIVE REMOVAL; MAGNETIC CHITOSAN; DYE REMOVAL; MONTMORILLONITE; COMBINATION; WATER;
D O I：
10.1016/j.matchemphys.2020.123236
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
New modified chitosan nano-montmorillonite composites were synthesized for efficient removal of Methylene Blue (MB) pollutant. The composites' structure and morphology were confirmed by H-1 NMR, FTIR, TGA, SEM, XRD, XPS, water regain, stability in acidic medium, and pH(pzc). Factors influencing dye adsorption; nano-montmorillonite ratio, initial dye concentration, composite dose, pH, temperature, contact time, and desorption were investigated. The new modified composites showed very fast adsorption performance and equilibrium occurred after 8 min with adsorption capacity 248.9, 276.03, 204.39, and 180 mg/g for R0, RI, RII, and RIII respectively. MB adsorption is a multilayer process preceded via electrostatic attraction in alkaline medium and/or cation exchange in acidic medium. Adsorption data is well-fitting to Freundlich isotherm and pseudo-second-order kinetics. The composites prepared showed high desorption ability amounting to 77.13, 84.28, 88.47, and 97% for R0, RI, RII, and RIII respectively by using 0.5 M HCl eluent.
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页数：12
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