<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>Clinoptilolite from Dylągówka (Poland) with an external cation exchange capacity (ECEC) of 16 meq/100 g determined by adsorption of alkylammonium ions was treated with hexadecyltrimethylammonium (C16) and dioctadecyldimethylammonium (2C18) bromides in amounts equivalent to 1.0 and 1.5 ECEC. The products were characterized using IR spectroscopy and C and N determinations. The sorption of chromate on the modified mineral was measured spectrophotometrically as a function of pH, concentration of Cr(VI) or the proportion of the sorbent to solution. The amount of chromate removed from the solution continuously decreased with increasing pH in the range 1.3-10. At pH 2.6-3.1, the maximum adsorption of Cr(VI) by the organo-zeolites (103 and 124 mmol/kg) was observed for the samples modified using a 1.5 ECEC surfactant concentration. Considerably lower adsorption values (37 and 46 mmol/kg) were obtained with sorbents prepared using a 1.0 ECEC concentration of the alkylammonium ions.</p></abstract>

Clinoptilolite from Dylągówka (Poland) with an external cation exchange capacity (ECEC) of 16 meq/100 g determined by adsorption of alkylammonium ions was treated with hexadecyltrimethylammonium (C16) and dioctadecyldimethylammonium (2C18) bromides in amounts equivalent to 1.0 and 1.5 ECEC. The products were characterized using IR spectroscopy and C and N determinations. The sorption of chromate on the modified mineral was measured spectrophotometrically as a function of pH, concentration of Cr(VI) or the proportion of the sorbent to solution. The amount of chromate removed from the solution continuously decreased with increasing pH in the range 1.3-10. At pH 2.6-3.1, the maximum adsorption of Cr(VI) by the organo-zeolites (103 and 124 mmol/kg) was observed for the samples modified using a 1.5 ECEC surfactant concentration. Considerably lower adsorption values (37 and 46 mmol/kg) were obtained with sorbents prepared using a 1.0 ECEC concentration of the alkylammonium ions.

Sorption of Chromate by Clinoptilolite Modified With Alkylammonium Surfactants

Geophysics and Environmental Protection, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland

Mineralogia

{"article-title":"Sorption of Chromate by Clinoptilolite Modified With Alkylammonium Surfactants"}

Clinoptilolite from Dylągówka (Poland) with an external cation exchange capacity (ECEC) of 16 meq/100 g determined by adsorption of alkylammonium ions was...

Sorption of Chromate by Clinoptilolite Modified With Alkylammonium Surfactants

Published Online: Jan 25, 2007

Page range: 93 - 98

DOI: https://doi.org/10.2478/v10002-007-0002-0

Keywords
clinoptilolite, alkylammonium surfactants, sorption of chromate

This content is open access.

Sorption of Chromate by Clinoptilolite Modified With Alkylammonium Surfactants

Published Online: Jan 25, 2007

Page range: 93 - 98

DOI: https://doi.org/10.2478/v10002-007-0002-0

Keywordsclinoptilolite, alkylammonium surfactants, sorption of chromate

This content is open access.

Keywords
clinoptilolite, alkylammonium surfactants, sorption of chromate