Adsorption of methylene blue as a descriptor of C-S-H nanostructure

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Journal titleCement and Concrete Composites
Pages246250; # of pages: 5
SubjectAdsorption desorption isotherms; Calcium silicate hydrate; Descriptors; Freundlich; Langmuirs; Methylene Blue; Nanostructural characteristics; Non-linear; Regression method; Sorption models; UV-vis spectra; UV-vis spectroscopy; Adsorption; Desorption; Dyes; Hydrates; Hydration; Nanostructures; Silicate minerals; Ultraviolet spectroscopy; Calcium silicate
AbstractThe adsorption of methylene blue (MB) on C-S-H surfaces (C/S ratios 0.60-1.80) and its dependence on C-S-H nanostructure was investigated. UV-VIS spectroscopy was used to obtain the adsorption-desorption isotherms at 23 °C, 35 °C and 50 °C. The character of the UV-VIS spectra and the nature of the C-S-H-MB interaction are discussed. Several sorption models including those due to Langmuir, Harkins-Jura, Halsey, Henderson, and Freundlich are fitted to the data using a non-linear multiple-regression method. Factors influencing the sorption of MB by C-S-H are discussed. The results demonstrated that the adsorption of MB molecules on C-S-H strongly depends on the nanostructural characteristics of C-S-H. © 2010 Published by Elsevier Ltd. All rights reserved.
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AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Research in Construction (IRC-IRC)
Peer reviewedYes
NPARC number21271437
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Record identifier29fbc8a0-b8b1-4b5e-a889-1913d87e8c85
Record created2014-03-24
Record modified2016-05-09
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