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Removal of chromium(VI) from aqueous solutions using zeolites modified with HDTMA and ODTMA surfactants

Barbara Szala, Tomasz Bajda and Anna Jelen
Removal of chromium(VI) from aqueous solutions using zeolites modified with HDTMA and ODTMA surfactants
Clay Minerals (May 2015) 50 (1): 103-115

Abstract

The removal of Cr(VI) from aqueous solutions under various conditions was investigated using a natural clinoptilolite and a synthetic zeolite derived from fly-ash (Na-P1), modified either with hexadecyltrimethylammonium bromide (HDTMA) or octadecyltrimethylammonium bromide (ODTMA). The study was focused mainly on the impact of the properties of the zeolite on the sorption capacity, the sorption mechanism, the influence of pH and the durability of the immobilization. The zeolites were modified with HDTMA and ODTMA surfactants up to 100% and 120% of their external cation exchange capacity. Batch and column studies were conducted to evaluate the influence of pH and the initial Cr(VI) concentration on their efficiencies for removing chromates. The organo-zeolites show a significant ability to remove Cr(VI) from aqueous solutions. The amount of Cr(VI) removed by organo-clinoptilolite and organo-zeolite Na-P1 is greater at low pH values, whereas the sorption efficiency decreased with increasing pH. Sorption of Cr(VI) was more efficient with the HDTMA-modified organo-clinoptilolite (150 mmol Cr(VI)/kg) than the ODTMA-modified clinoptilolite (132 mmol Cr(VI)/kg). The maximum sorption capacity was obtained with the 1.2 X ECEC ODTMA-modified clinoptilolite (237 mmol Cr(VI)/kg). The organo-zeolites Na-P1 adsorbed Cr(VI) from aqueous solutions more effectively and were much more durable than the organo-clinoptilolites.


ISSN: 0009-8558
EISSN: 1471-8030
Coden: CLMIAF
Serial Title: Clay Minerals
Serial Volume: 50
Serial Issue: 1
Title: Removal of chromium(VI) from aqueous solutions using zeolites modified with HDTMA and ODTMA surfactants
Affiliation: AGH University of Science and Technology, Krakow, Poland
Pages: 103-115
Published: 20150529
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 42
Accession Number: 2015-055321
Categories: Environmental geologyGeochemistry of rocks, soils, and sediments
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
N48°00'00" - N50°00'00", E23°00'00" - E26°00'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201525
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