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Synthesis, structure and ion exchange properties of 11 angstrom tobermorites from newsprint recycling residue

Synthesis, structure and ion exchange properties of 11 angstrom tobermorites from newsprint recycling residue

Coleman, Nichola (2005) Synthesis, structure and ion exchange properties of 11 angstrom tobermorites from newsprint recycling residue. Materials Research Bulletin, 40 (11). pp. 2000-2013. ISSN 0025-5408 (doi:10.1016/j.materresbull.2005.05.006)

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Abstract

Al-substituted 11 angstrom tobermorites were obtained from stoichiometrically adjusted mixtures of newsprint recycling waste, sodium silicate and calcium oxide via hydrothermal synthesis at 100 degrees C. Hydrothermal processing in water yielded a highly crystalline 11 angstrom tobermorite product with a Cs+ cation exchange capacity of 85 meq 100 g(-1) and selective Cs+ distribution coefficient of similar to 5500 cm(3) g(-1). Conversely, a product of inferior crystallinity was obtained from hydrothermal synthesis in alkaline liquor whose Cs+ ion exchange capacity and selective Cs+ distribution coefficient were found to be 66.3 meq 100 g(-1) and similar to 700 cm(3) g(-1), respectively. Silicate chain configuration was found to have a modest impact on the number of cation exchange sites per unit cell, whereas the influence of structural defects on selectivity was more pronounced. The structures and ion exchange credentials of both 11 angstrom tobermorite products corresponded well with those of their essentially phase-pure counterparts. (C) 2005 Elsevier Ltd. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Ceramics, Layered compounds, Chemical synthesis, Nuclear magnetic resonance (NMR), Crystal structure
Faculty / Department / Research Group: Faculty of Engineering & Science
Last Modified: 14 Oct 2016 09:28
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/11795

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