Journal of Advanced Concrete Technology
Online ISSN : 1347-3913
ISSN-L : 1346-8014
Scientific paper
Adsorption of Polycarboxylate-based Superplasticizer onto Natural Bentonite
Weishan WangBaicun ZhengZhongjun FengZuiliang DengLefeng Fu
Author information

2012 Volume 10 Issue 10 Pages 323-331


The adsorption of polycarboxylate-based superplasticizer onto natural bentonite was investigated in aqueous solution using a batch technique with respect to initial adsorbate concentration, contact time, temperature, pH value and ionic strength. Lower pH value and higher ionic strength were proved to be favorable for the adsorption. The pseudo-first-order, pseudo-second-order and intraparticle diffusion models were used to describe the kinetic data and the kinetic constants were also determined. The experimental data fitted the pseudo-second-order model well. The Langmuir, Freundlich and Dubinin-Radushkevich (D-R) equations were applied to describe the equilibrium isotherm and the isotherm constants were also evaluated. The langmuir model agreed with the experimental well. Thermodynamic parameters (ΔG0, ΔH0 and ΔS0) indicated that the adsorption was endothermic and physical in nature.

Information related to the author
© 2012 by Japan Concrete Institute
Next article