Adsorption of cationic dye from water using thermo-sensitive colloid composed of methylcellulose and sodium alginate

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• 作者：Zhongmin Li ; Wenyan Jiang ; Linye Zhang ; Yizhi Wang…
• 关键词：Adsorption ; Thermo ; sensitive colloid ; Sodium alginate ; Methylcellulose ; Methylene blue
• 刊名：Colloid & Polymer Science
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：293
• 期：10
• 页码：2753-2761
• 全文大小：515 KB
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• 作者单位：Zhongmin Li (1)
  Wenyan Jiang (1)
  Linye Zhang (1)
  Yizhi Wang (1)
  Guangtao Wei (2)
  
  1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China
  2. Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Nanning, 530004, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Polymer Sciences
  Physical Chemistry
  Soft Matter and Complex Fluids
  Characterization and Evaluation Materials
  Food Science
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1435-1536

文摘

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? 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?. 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 ?8.26 kJ·mol?, and the ΔS was ?43.00 J·K?·mol?. 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 blue