Adsorption of cationic dye from water using thermo-sensitive colloid composed of methylcellulose and sodium alginate
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Abstract
The adsorption behaviors of methylene blue (MB) by a thermo-sensitive colloid composed of sodium alginate and methylcellulose (TSC-SA/MC) have been investigated. The results showed that the dosage of SA had an important effect on the adsorption capability of TSC-SA/MC. The maximum of adsorption capability appeared at m SA/m MC of 0.3:1, and among all the differences in adsorption capability between 30 and 60 °C, 61 mg·g−1 was the maximum adsorption difference appeared at m SA/m MC of 0.3:1. The adsorption capability of TSC-SA/MC increased with pH from 2 to 11, decreased with temperature from 30 to 70 °C. The adsorption data were not well fitted by Langmuir, Freundlich, Temkin, or Dubinin-Radushkevich model, suggesting the adsorption of MB on TSC-SA/MC did not belong to a single adsorption style. The maximum adsorption capacity of adsorption isotherm data was 1098.5 mg·g−1. The adsorption of MB by TSC-SA/MC fitted the pseudo-second-order model, and the main resistances for MB adsorption by TSC-SA/MC involved the external mass transfer, intraparticle mass transfer, and sorption on active site. The ΔH of MB adsorption by TSC-SA/MC was −48.26 kJ·mol−1, and the ΔS was −143.00 J·K−1·mol−1. The ΔG indicated that the adsorption could change from a spontaneous process to a nonspontaneous process with temperature increase. Both physical and chemical adsorption took place in the MB adsorption process. Fourier transform infrared spectroscopy (FTIR) spectra of filter cakes of TSC-SA/MC before and after adsorption of MB showed that the adsorption process for MB by TSC-SA/MC had a quite complicated mechanism, and the successful adsorption involved many chemical groups.
Keywords
Adsorption Thermo-sensitive colloid Sodium alginate Methylcellulose Methylene blueNotes
Acknowledgments
Financial support from Dean Project of Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology (2012 K11), National Natural Science Foundation of China (21366003), Guangxi Science Foundation Funded Project (2013GXNSFAA019296), and Innovation Project of Guangxi Graduate Education (YCSZ2015025) is gratefully acknowledged. The authors would like to thank Shanshan Zhou, Yuting Zeng, Dongli Mo, and Chuwei Huang for their help in the study.
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