Kinetics and thermodynamics of adsorption of Cu2+ and methylene blue to casein hydrogels

Several casein hydrogels were synthesized using glutaraldehyde as a crosslinker. The hydrogel prepared from 10 wt% casein and 5 wt% glutaraldehyde at pH = 7.5 showed the best adsorption performance for Cu 2+ and methylene blue (MB). The morphology and thermal stability of the hydrogels were characte...

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Bibliographic Details
Published in:Journal of polymer research 2019, Vol.26 (9), p.1-14, Article 235
Main Authors: Yi, Juzhen, Li, Yongqiu, Yang, Liqun, Zhang, Li-Ming
Format: Article
Language:English
Subjects:
Adsorption
Casein
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Copper
Crosslinking
Emission analysis
Field emission microscopy
Fourier transforms
Glutaraldehyde
Gravimetric analysis
Hydrogels
Industrial Chemistry/Chemical Engineering
Infrared spectrophotometers
Methylene blue
Morphology
Original Paper
Polymer Sciences
Spectrophotometry
Thermal stability
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Summary:Several casein hydrogels were synthesized using glutaraldehyde as a crosslinker. The hydrogel prepared from 10 wt% casein and 5 wt% glutaraldehyde at pH = 7.5 showed the best adsorption performance for Cu 2+ and methylene blue (MB). The morphology and thermal stability of the hydrogels were characterized by Fourier transform infrared spectrophotometry (FTIR), field emission scanning electron microscopy (FESEM) and thermo gravimetric analysis (TGA). Adsorption data were observed to fit well to pseudo second-order kinetics and the Freundlich-Langmuir switch model. The thermodynamic parameters of the adsorption showed that the adsorption of Cu 2+ and MB into casein hydrogel was a spontaneous process.
ISSN:1022-9760
1572-8935
DOI:10.1007/s10965-019-1870-x