O'Connor, Sean J., MacKenzie, Kenneth J. D., Smith, Mark E. and Hanna, John V.. (2010) Ion exchange in the charge-balancing sites of aluminosilicate inorganic polymers. Journal of Materials Chemistry, Vol.20 (No.45). pp. 10234-10240. ISSN 0959-9428

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Abstract

A simple ion-exchange method is reported for replacing the charge-balancing cations in aluminosilicate inorganic polymers with a range of other cations. Complete exchange of the Na+ in a conventional Na-inorganic polymer by K+, Ag+, NH4+ and Pb2+ was achieved by this method, with a lower degree of exchange by Li+ (82%), Cd2+ (78%) and Mg2+ (57%). The NH4+-compound can be completely exchanged by Ag+, but the exchange of NH4+ for other cations is less efficient in this compound than when using the Na-compound as the starting material. The X-ray-amorphous nature and Al and Si environment of the original Na inorganic polymer are unchanged by the ion exchange process. The K+, Li+ and NH4+-compounds prepared by ion exchange are suitable precursors for crystalline ceramics, forming leucite, spodumene and mullite respectively, upon heating at 1100 degrees C. The ammonium ion in the NH4(+)(-)exchanged compound was shown by FTIR and solid-state MAS NMR to decompose gradually on heating up to 600 degrees C, at which temperature, a significant proportion of the Al is in 5-fold coordination with oxygen. This suggests that the NH4+-exchanged compound heated at 600 degrees C may be an efficient catalyst for organic reactions such as the Friedel-Crafts alkylation. The efficient exchange capability of Na aluminosilicate inorganic polymer for Pb2+ and Cd2+ (but not Hg2+) suggests a potential application for this material for the cost-effective removal of heavy metal ions from wastewater streams, while the Ag+-exchanged compound was shown in this work to be a powerful antimicrobial agent against Staphylococcus aureus.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Journal of Materials Chemistry
Publisher:	Royal Society of Chemistry
ISSN:	0959-9428
Date:	2010
Volume:	Vol.20
Number:	No.45
Number of Pages:	7
Page Range:	pp. 10234-10240
Identification Number:	10.1039/c0jm01254h
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Industrial Research Ltd. of the Foundation for Research Science and Technology, MacDiarmid Institute for Advanced Materials and Nanotechnology, Engineering and Physical Sciences Research Council (EPSRC), Higher Education Funding Council for England (HEFCE), University of Warwick, Advantage West Midlands (AWM), European Regional Development Fund (ERDF)
Grant number:	CO8X0302
URI:	http://wrap.warwick.ac.uk/id/eprint/4846

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