{"title":"Cation exchange studies on cement hydration phase: Ca5Si6O18H2·4H2O","authors":"N. Labhsetwar, O.P. Shrivastava","doi":"10.1016/0168-7336(89)80039-7","DOIUrl":null,"url":null,"abstract":"<div><p>Recently it has been established that 11 Å tobermorite (a calcium silicate hydrate, closely related to Ca<sub>5</sub>Si<sub>6</sub>O<sub>18</sub>H<sub>2</sub>·4H<sub>2</sub>O) shows remarkable ion exchange capacity for several ions in neutral and alkaline mediums. The Zn<sup>2+</sup> ⇌ Ca<sup>2+</sup> exchange data by 11 Å tobermorite in nearly neutral medium is described. A 0.92–12.8 wt.-% of zinc was achieved by placing tobermorite in dilute solutions of Zn<sup>2+</sup> (100–2000 ppm) the X-ray powder diffraction data reveal that the crystallinity of the exchanger remains intact after cation exchange. The thermodynamics of the exchange reaction has also been developed. This new ion exchanger resembles clays and zeolites in some respects.</p></div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 3","pages":"Pages 225-233"},"PeriodicalIF":0.0000,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80039-7","citationCount":"7","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Reactivity of Solids","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0168733689800397","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 7
Abstract
Recently it has been established that 11 Å tobermorite (a calcium silicate hydrate, closely related to Ca5Si6O18H2·4H2O) shows remarkable ion exchange capacity for several ions in neutral and alkaline mediums. The Zn2+ ⇌ Ca2+ exchange data by 11 Å tobermorite in nearly neutral medium is described. A 0.92–12.8 wt.-% of zinc was achieved by placing tobermorite in dilute solutions of Zn2+ (100–2000 ppm) the X-ray powder diffraction data reveal that the crystallinity of the exchanger remains intact after cation exchange. The thermodynamics of the exchange reaction has also been developed. This new ion exchanger resembles clays and zeolites in some respects.
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