High adsorption selectivity of ZnAl layered double hydroxides and the calcined materials toward phosphate
A high selectivity toward phosphate and reusability were exhibited by the calcined ZnAl–CO 3 LDHs at different temperatures. The selective adsorption of phosphate ions was investigated on CO 3 2 - , Cl −, and NO 3 - -type ZnAl layered double hydroxides (LDHs) and the calcined CO 3 2 - -type LDH at 2...
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Published in | Journal of colloid and interface science Vol. 343; no. 1; pp. 225 - 231 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier Inc
01.03.2010
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | A high selectivity toward phosphate and reusability were exhibited by the calcined ZnAl–CO
3 LDHs at different temperatures.
The selective adsorption of phosphate ions was investigated on
CO
3
2
-
, Cl
−, and
NO
3
-
-type ZnAl layered double hydroxides (LDHs) and the calcined
CO
3
2
-
-type LDH at 200, 400, 600 and 800
°C, respectively. The calcined LDHs and
NO
3
-
-type LDH showed high selectivity toward phosphate ions, while the Cl
−-type LDH shows selectivity toward both
SO
4
2
-
and phosphate ions. The
NO
3
-
-type LDH selectively adsorbed phosphate ions mainly through ion exchange. The calcined samples possibly proceed through ligand complexation or electrostatic attraction between phosphate ions and hydrated ZnO formed after calcination, although the structural memory effect was observed for the samples calcined below 600
°C with the formation of
CO
3
2
-
-type LDH. Adsorption/desorption behaviors indicated that the calcined samples had good stability and reusability. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 ObjectType-Feature-1 |
ISSN: | 0021-9797 1095-7103 |
DOI: | 10.1016/j.jcis.2009.11.004 |