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Sorption of organic compounds by Al and Zr-hydroxy-intercalated and pillared bentonite

Winnie Matthes and Guenther Kahr
Sorption of organic compounds by Al and Zr-hydroxy-intercalated and pillared bentonite
Clays and Clay Minerals (December 2000) 48 (6): 593-602


Owing to their large and chemically active surface, hydroxy-intercalated and pillared clays can be potent sorbents for organic compounds. The sorption behavior of Al and Zr-hydroxy-intercalated bentonite (HAl-, HZr-MX80), Al and Zr-pillared bentonite (Al-MX80, Zr-MX80), and a commercial Al-pillared bentonite (EXM 534) for 3-chloroaniline (3-CA), atrazine (AT), and 3-chlorophenol (3-CP) was investigated. The results were compared with the sorption behavior of the untreated Na-rich bentonite (MX80) and granulated activated carbon (GAC). Also the influence of the salinity of the sorbate and the age of the sorbents was studied. Al and Zr-hydroxy-intercalated and pillared bentonites sorbed higher amounts of 3-CA, AT, and 3-CP than the untreated bentonite. The quantities sorbed related to the electron-donating properties of the sorbate and the acidity of the sorbents. Sorbed quantities increased from the hydroxy-intercalated to the pillared species, and from the Al to the Zr forms. The organic bases, 3-CA and AT, were sorbed in higher quantities than the organic acid 3-CP. For AT, the sorbents exhibited a high affinity. Aging of the samples and a high ionic strength of the sorbate reduced the sorption of 3-CA, whereas the sorption of AT was not affected greatly. The sorption capacity of GAC for organic bases was generally higher than that of the hydroxy-intercalated and pillared bentonites. The data suggest that at initial concentrations at a ppm level, 3-CA and AT can be entirely removed from aqueous solutions by Al and Zr-hydroxy-intercalated and pillared bentonites. These materials, especially Zr-pillared bentonites, represent potent alternative sorbents for atrazine, chloroanilines, and probably a wide range of other organic bases.

ISSN: 0009-8604
Serial Title: Clays and Clay Minerals
Serial Volume: 48
Serial Issue: 6
Title: Sorption of organic compounds by Al and Zr-hydroxy-intercalated and pillared bentonite
Affiliation: Swiss Federal Institute of Technology, Laboratory for Clay Mineralogy, Division of Geotechnical Engineering, Zurich, Switzerland
Pages: 593-602
Published: 200012
Text Language: English
Publisher: Clay Minerals Society, Clarkson, NY, United States
References: 60
Accession Number: 2001-019905
Categories: General geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200107
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