Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 102, Issue 10, Pages 6322-6336Publisher
WILEY
DOI: 10.1111/jace.16494
Keywords
alkalis; cement; magnesium silicate hydrate (M-S-H); sorption
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Funding
- Swiss National Science Foundation [206021_150638/1]
- Swiss National Science Foundation (SNF) [206021_150638] Funding Source: Swiss National Science Foundation (SNF)
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The binding of Na+, K+, and Li+ by magnesium silicate hydrate (M-S-H) was investigated in batch sorption experiments. Sorption isotherms and cation exchange measurements indicated the binding of alkalis in cation exchange sites compensating the negative surface charge of M-S-H. Higher pH values led to further deprotonation of the silanol groups and a higher alkali uptake by M-S-H. No significant incorporation of alkalis in the main silica or magnesium oxide sheets was observed. However, the silica sheets were less polymerized in the presence of higher alkali hydroxide concentrations.
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