Issue 4, 2002

Abstract

This work evaluates the effects of different variables such as MII/MIII ratio (layer charge), interlayer anion (CO32− or Cl) and nature of the trivalent cation (Al3+ or Fe3+) in the sorption of 2,4,6-trinitrophenol (TNP) by layered double hydroxides (LDH) [MII1 − xMIIIx(OH)2]Anx/n·mH2O (MII = Mg2+, MIII = Al3+ or Fe3+, A = CO32− or Cl, x = 0.33 − 0.20) and its calcined products MII1 − xMIIIxO1 + x/2. TNP adsorption by anionic exchange is strongly affected by exchangeable interlayer anion, being dramatically favoured in the case of MgAlCl. TNP adsorption by anionic exchange on the MgAlCO3 system is very low and it is not affected by the Mg/Al ratio while it is in MgAlCl. In the case of the MgFeCl system, the higher polarizing character of Fe3+ makes the exchange reaction less favorable. TNP adsorption by reconstruction of the calcined products decreases in the order MgAlCO3500 > MgAlCl500 > MgFeCl500, and it is favored by the layer charge decrease.

Graphical abstract: Hydrotalcites as sorbent for 2,4,6-trinitrophenol: influence of the layer composition and interlayer anion

Article information

Article type
Paper
Submitted
03 Sep 2001
Accepted
17 Dec 2001
First published
08 Feb 2002

J. Mater. Chem., 2002,12, 1027-1034

Hydrotalcites as sorbent for 2,4,6-trinitrophenol: influence of the layer composition and interlayer anion

C. Barriga, M. Gaitán, I. Pavlovic, M. A. Ulibarri, M. C. Hermosĩn and J. Cornejo, J. Mater. Chem., 2002, 12, 1027 DOI: 10.1039/B107979B

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