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Colloid Journal

, Volume 70, Issue 3, pp 341–348 | Cite as

The effect of the dehydration conditions of chitosan-based polymeric adsorbents on the adsorption of nickel cations

  • O. V. Solovtsova
  • T. Yu. Grankina
  • O. K. Krasil’nikova
  • N. V. Serebryakova
  • S. M. Shinkarev
  • A. M. VoloshchukEmail author
Article

Abstract

The structure and adsorption properties (with respect to water vapor and nickel cations) of chitosan samples dehydrated by either lyophilization after precipitation with NaOH or Na2CO3 or drying in air are investigated. IR spectroscopy and X-ray diffraction data testify that the lyophilization causes both changes in the conformation of chitosan macromolecules and a substantial rise in the crystallinity of the polymer to compare with the air dried one. Chitosan structure ordering resultant from the lyophilization noticeably increases its sorption ability with respect to both water vapor and nickel cations. For example, the sorption capacity of the lyophilized chitosan with respect to nickel cations is as high as 4.5 mmol/g and, thus, is threefold higher than that of air-dried chitosan. The comparative analysis of water adsorption isotherms in the region of low degrees of filling indicates that chitosan structure ordering resultant from the lyophilization changes the number and the energy of primary adsorption sites.

Keywords

Chitosan Colloid Journal Pyranose Ring Water Vapor Adsorption Chitosan Sample 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© MAIK Nauka 2008

Authors and Affiliations

  • O. V. Solovtsova
    • 1
  • T. Yu. Grankina
    • 1
  • O. K. Krasil’nikova
    • 1
  • N. V. Serebryakova
    • 1
  • S. M. Shinkarev
    • 2
  • A. M. Voloshchuk
    • 1
    Email author
  1. 1.Frumkin Institute of Physical Chemistry and ElectrochemistryRussian Academy of SciencesMoscowRussia
  2. 2.All-Russia Research and Technological Institute of Biological IndustryMoscow oblastRussia

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