4.7 Article

The use of clays to sequestrate organic pollutants. Leaching experiments

Journal

CHEMOSPHERE
Volume 73, Issue 11, Pages 1731-1736

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2008.09.007

Keywords

Leaching experiments; Clays; Sequestration; Organic pollutants; Remediation

Funding

  1. Associazione Ambiente, Territorio e Formazione, ATF (Alessandria, Italy)
  2. MIUR (Ministero Italiano Universita e Ricerca, Rome, Italy)

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Leaching experiments are performed from clay-pollutant systems in order to evaluate the capability of clays to sequestrate organic pollutants from wastewaters. Reference kaolinite KGa-1b. montmorrillonite SWy-2 and reference soil BCR(R)-700 are the sorbent materials. 2,4,6-trichloroaniline (2,4,6-TCA) and 4-chlorophenol (4-CP) are the typical pollutants, sorbed at amounts of 10.0 mg g(-1) and 5.8 mg g(-1) on SWy-2 and 7.3 mg g(-1) and 2.2 mg g(-1) on KGa-1b, respectively. The leaching agents are ultrapure water and model Solutions of acid rain and surface waters that simulate meteoric leaching, 1.0 mM HNO3, 1.0 mM H2SO4 Solutions and a methanol/water 50/50 (v/v) mixture simulate leaching agents of industrial Source. The results are compared and the preferential capability of the clays to sequestrate the more lipophilic 2,4,6-TCA is evidenced. The bond interactions are discussed and explained through preferential adsorption reactions. For montmorrillonite also a simultaneous intercalation in the phyllosilicate interlayer is proposed. (C) 2008 Elsevier Ltd. All rights reserved.

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