Influence of Sulfate on Adsorption Capacity and Kinetics of Polycarboxylate-type Superplasticizer
The experimental results on the effect of adsorption quantity and rate of polycarboxylate-type superplasticizer on cement particles were presented. The experimental results followed different adsorption kinetics models. It was indicated that the Na2SO4 addition
of 0.5% or 1.0% had negative influence on the adsorption quantity of polycarboxylate-type superplasticizer on cement particles. However, the Na2SO4 addition of 0.1% or 0.2% could favor the adsorption. CaSO42H2O had little effect on the adsorption
quantity of polycarboxylate-type superplasticizer. The results on the effect of sulfate on the adsorption of polycarboxylate-type superplasticizer on cement particles followed the Langmuir pseudo-second-order adsorption kinetics model. Na2SO4 affected the time of equilibrium
adsorption via the reduction of pseudo-second-order adsorption rate constant and delayed the time of equilibrium adsorption. The Na2SO4 addition of 0.2% increased the pseudo-second-order adsorptive rate constant, while the Na2SO4 addition of 1.0%
decreased the pseudo-second-order adsorptive rate constant. CaSO42H2O could result in a slight effect on the pseudo-second-order adsorption rate constant rather than Na2SO4.
Keywords: adsorption quantity; adsorption rate; polycarboxylate-type superplasticizer; pseudo-second-order adsorption rate constant; sulfate
Document Type: Research Article
Affiliations: 1: College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China 2: College of Material Science and Engineering, Chongqing University, Chongqing 400045, China
Publication date: 01 November 2012
- Journal of the Chinese Ceramic Society (JCCS), published in Chinese and in English, is a comprehensive monthly periodical focused on the fields of inorganic and non-metallic materials. The main purpose of the JCCS is to report the latest creative achievements in research, production and design for ceramics, glass, cementing materials, refractory, artificial crystals and other non-metallic materials. JCCS is regarded as an important journal in inorganic and non-metallic materials sciences in China and has been awarded by China Association for Science and Technology. The full-text of papers in JCCS is also published by CNKI (China National Knowledge Infrastructure). JCCS is indexed in EI Compendex, CA( Chemical Abstracts) ,SA and Ж and more than 20 databases.
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