Nitrate absorption through hydrotalcite reformation
Thermally activated hydrotalcite based upon a Zn/Al hydrotalcite with carbonate in the interlayer has been used to remove nitrate anions from an aqueous solution resulting in the reformation of a hydrotalcite with a mixture of nitrate and carbonate in the interlayer. X-ray diffraction of the reformed hydrotalcites with a d(003) spacing of 7.60 Å shows that the nitrate anion is removed within a 30 minute period. Raman spectroscopy shows that two types of nitrate anions exist in the reformed hydrotalcite (a) nitrate bonded to the ‘brucite-like’ hydrotalcite surface and (b) aquated nitrate anion in the interlayer. Kinetically the nitrate is replaced by the carbonate anion over a 21 hour period. Two types of carbonate anions are observed. This research shows that the reformation of a thermally activated hydrotalcite can be used to remove anions such as nitrate from aqueous systems.
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|Item Type:||Journal Article|
|Additional Information:||This is one of a series of papers on the use of thermally activated hydrotalcites and their reformation to remove anions from aqueous media. In this case nitrate ions from water. Nitrate ions in water may be toxic to babies and young children|
|Keywords:||hydrotalcite, brucite, pyroaurite, takovite, nitrate removal, Raman microscopy, memory effect|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2006 Elsevier|
|Copyright Statement:||Reproduced in accordance with the copyright policy of the publisher.|
|Deposited On:||28 Sep 2006 00:00|
|Last Modified:||29 Feb 2012 13:24|
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