, Volume 13, Issue 6, pp 655–663 | Cite as

The effect of adsorbed carboxymethyl cellulose on the cotton fibre adsorption capacity for surfactant

  • L. Fras-ZemljičEmail author
  • P. Stenius
  • J. Laine
  • K. Stana-Kleinschek


The research reported in this paper demonstrates that the capacity of cotton fibres to adsorb cationic surfactants as well as the rate of the adsorption process can be increased by adsorbing carboxymethyl cellulose (CMC) onto the fibre surfaces; in addition, the adsorption can be restricted to the fibre surface. CMC was deposited by means of adsorption from an aqueous solution. The adsorption of N-cetylpyridinium chloride (CPC) from an aqueous solution onto the CMC-modified fibres was measured using UV-spectrometric determination of the surfactant concentration in the solution. Adsorption onto the cotton fibres was studied in a weakly basic environment (pH 8.5) where cotton fibres are negatively charged and the CPC ion is positively charged. Modification of the fibres by adsorption of CMC introduces new carboxyl groups onto the fibre surfaces, thereby increasing the adsorption capacity of the fibres for CPC. The initial rate of adsorption of CPC increased proportionally with the amount of charge; however, this rate slowed down at high degrees of coverage on fibres with a high charge. The adsorption of cationic surfactant to the anionic surface groups was stoichiometric, with no indication of multilayer or admicelle formation. It was evident that the acidic group content of the fibres was the primary factor determining cationic surfactant adsorption to these fibres.


Acid groups in fibres Adsorption capacity Carboxymethyl cellulose surfactant adsorption Conductometric titration Cotton fibres Modification of fibres Surfactant adsorption UV spectroscopy 



Carboxymethyl cellulose


Cetylpyridinium chloride


Critical micelle concentration



Fibre radius


Absorbance at the start of the experiment


Absorbance at equilibrium time


Absorbance of bath at time t


Concentration of absorbing species


Concentration of surfactant at equilibrium time


Equilibrium uptake of surfactant


Concentration of surfactant in the fibre at time t


Diffusion coefficient


Degree of exhaustion


Diffusion coefficient determined from the half-adsorption time


Diffusion coefficient calculated according to the square root law equation


Absorbance coefficient


Slope of the curve \(c_{t}/c_{\rm eq=}\hbox{f}(\sqrt{t})\)


thickness of sample


Molar mass of surfactant


average molecular weight


Mass of fibres


Mass of surfactant


Half-adsorption time


Solution volume


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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • L. Fras-Zemljič
    • 1
    Email author
  • P. Stenius
    • 2
  • J. Laine
    • 2
  • K. Stana-Kleinschek
    • 1
  1. 1.Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical EngineeringUniversity of MariborMariborSlovenia
  2. 2.Laboratory of Forest Products ChemistryHelsinki University of Technology (HUT)EspooFinland

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