文献类型：期刊文献

英文题名：Adsorption of Polycarboxylate-based Superplasticizer onto Natural Bentonite

作者：Wang, Weishan[1];Zheng, Baicun[1];Feng, Zhongjun[2];Deng, Zuiliang[2];Fu, Lefeng[2]

机构：[1]E China Univ Sci & Technol, Res & Dev Ctr Sports Mat, Shanghai 200237, Peoples R China;[2]Shanghai Sunrisechem Co Ltd, Shanghai 200237, Peoples R China

年份：2012

卷号：10

期号：10

起止页码：323

外文期刊名：JOURNAL OF ADVANCED CONCRETE TECHNOLOGY

收录：;EI(收录号：20124415633154);WOS:【SCI-EXPANDED(收录号:WOS:000314170400001)】；

基金：The financial support (11nm0501900, 10DZ2290600) from Science and Technology Commission of Shanghai Municipality was gratefully acknowledged. The research was also partially supported by the science and technology cooperation project between Yunnan province and university/China academy (2009AD008).

语种：英文

外文关键词：Bentonite - Ionic strength - Isotherms - pH

摘要：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 (Delta G(0), Delta H-0 and Delta S-0) indicated that the adsorption was endothermic and physical in nature.