Facile fabrication of gelatin/bentonite composite beads for tunable removal of anionic and cationic dyes

[Display omitted] •The Gel–Bent was prepared by compacting gelatin and bentonite facilely.•The beads offer ease of operation and fast separation compared with powder.•The Gel–Bent could remove both anionic CR and cationic MB dyes.•The adsorption property of Gel–Bent was adjusted just by changing the...

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Bibliographic Details
Published in:Chemical engineering research & design 2018-06, Vol.134, p.336-346
Main Authors: Li, Wenyun, Ma, Qingliang, Bai, Yunshan, Xu, Dandan, Wu, Min, Ma, Hongzhu
Format: Article
Language:English
Subjects:
Adsorption
Beads
Bentonite
Cationic dyes
Cations
Compacting
Dyes
Error functions
Fourier transforms
Gelatin
Infrared analysis
Infrared spectra
Inorganic salts
Isotherm
Methylene blue
Regression analysis
Scanning electron microscopy
Selective adsorption
Sodium chloride
Surfactants
Thermogravimetric analysis
X-ray diffraction
Zeta potential
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Summary:[Display omitted] •The Gel–Bent was prepared by compacting gelatin and bentonite facilely.•The beads offer ease of operation and fast separation compared with powder.•The Gel–Bent could remove both anionic CR and cationic MB dyes.•The adsorption property of Gel–Bent was adjusted just by changing the amount of bentonite. The gelatin/bentonite composite beads (Gel–Bent) were facilely prepared by compacting gelatin and bentonite and characterized using scanning electron microscopy, X-ray diffraction, fourier transform infrared spectra, thermogravimetric analysis and Zeta potential. The tunable adsorption property of Gel–Bent toward the anionic dye (congo red (CR)) and cationic dye (methylene blue (MB)) was investigated by changing the mass ratio of bentonite to gelatin. The effect of contact time, temperature and pH on the adsorption of CR and MB onto Gel-12.5%Bent (12.5% of Bent in amount of Gel) was investigated. Its selective adsorption property in the MB/CR binary system was evaluated under the co-presence of anionic surfactant SDS and inorganic salt NaCl at various pHs. Three isotherm models in linear and non-linear regressions, and two kinetic models were employed and assessed by various error functions. In addition, the swelling behavior of the composite beads was studied and the possible adsorption mechanism was also proposed. All the information indicated that Gel–Bent was expected to be a promising candidate for efficient removal of anionic and cationic dyes.
ISSN:0263-8762
1744-3563
DOI:10.1016/j.cherd.2018.04.016