Adsorption of cationic and anionic dyes on montmorillonite in single and mixed wastewater

Montmorillonite was employed as adsorbent to remove cationic and anionic dyes respectively and simultaneously. When the dye present singly, it only had a good effect to cationic dye removal. The experimental data well fitted to pseudo-second-order kinetic model, and the adsorption behavior followed...

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Published inJournal of porous materials Vol. 26; no. 6; pp. 1861 - 1867
Main Authors Zhang, Qian, Jing, Ruisen, Zhao, Shifeng, Wu, Mi, Liu, Xijuan, Shao, Yifei, Lv, Fengzhu, Liu, Aiju, Meng, Zilin
Format Journal Article
LanguageEnglish
Published New York Springer US 01.12.2019
Springer Nature B.V
Subjects
Adsorption
Catalysis
Cationic dyes
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Computer simulation
Contaminants
Dyes
Hydrophobicity
Interlayers
Molecular dynamics
Montmorillonite
Physical Chemistry
Wastewater
Molecular simulation
Dyes
Adsorption
Montmorillonite
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Summary:Montmorillonite was employed as adsorbent to remove cationic and anionic dyes respectively and simultaneously. When the dye present singly, it only had a good effect to cationic dye removal. The experimental data well fitted to pseudo-second-order kinetic model, and the adsorption behavior followed the Langmuir model revealed that cationic dye adsorption was a monolayer coverage and charge-limited adsorption process. Molecular arrangement of the contaminants in the interlayer were analyzed by molecular simulation. As the cationic and anionic dyes co-exist, both cationic and anionic dyes could be removed. The adsorption mechanism of anionic dyes, under the circumstances, were investigated through equilibrium experiment, XRD and molecular dynamics simulation. The experimental data showed that anionic dyes in mixed wastewater were fitted Freundlich model well and the mechanism of anionic dyes removal was trapped by hydrophobic interaction on account of organic phase formed by cationic dyes in the interlayer.
ISSN:1380-2224
1573-4854
DOI:10.1007/s10934-019-00782-2