Colloid and Polymer Science

, Volume 267, Issue 10, pp 899–906 | Cite as

Adsorption of polyethylene glycol from aqueous solution on montmorillonite clays

  • X. Zhao
  • K. Urano
  • S. Ogasawara
Polymer Science


Adsorption rates and capacities of polyethylene glycol (PEG) were investigated for five montmorillonite clays. The adsorption of PEG for all the montmorillonite clays was rapid, and equilibrium was attained within 30 min. The adsorption isotherms of PEG for all the montmorillonites conformed to the Freundlich equation. The adsorption heats were 7.3 and 11.6 kJ · mol−1(mw.:2000), and 8.7 and 14.2 kJ · mol−1(mw.:20000) for the montmorillonite and the bentonite II-Ca, respectively. Adsorption capacities for all the clay samples approached constants for the molecular weight of PEG over 2000, though they increased with the increase of molecular weight under 2000. The adsorption capacities were slightly influenced by a nearly neutral pH. The montmorillonite clays which had different interlayer cations showed quite different adsorption capacities. The bentonite II-Ca, the acid clay, and the activated clay showed large adsorption capacities that were 30–50 % of that of an activated carbon.

Key words

Claymineral montmorillonite adsorption polyethyleneglycol watertreatment 


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Copyright information

© Steinkopff 1989

Authors and Affiliations

  • X. Zhao
    • 1
  • K. Urano
    • 1
  • S. Ogasawara
    • 1
  1. 1.Department of Material Science and Chemical EngineeringYokohama National UniversityYokohamaJapan

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