%0 Journal Article
%T Sorption of chromate by clinoptilolite modified with alkylammonium surfactants
%A Tomasz Bajda
%A Zenon KŁżapyta
%J Mineralogia Polonica
%D 2006
%I 
%X Clinoptilolite from Dyl1g¨®wka (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 and1.5 ECEC. The productswere characterized using IR spectroscopy and C andNdeterminations. The sorptionof chromate on the modified mineral was measured spectrophotometrically as a function of pH, concentrationof Cr(VI) or the proportion of the sorbent to solution. The amount of chromate removed from thesolution continuously decreased with increasing pH in the range 1.3¨C10. At pH 2.6¨C3.1, the maximumadsorption of Cr(VI) by the organo-zeolites (103 and 124 mmol/kg) was observed for the samples modifiedusing a 1.5 ECEC surfactant concentration. Considerably lower adsorption values (37 and 46mmol/kg) wereobtained with sorbents prepared using a 1.0 ECEC concentration of the alkylammonium ions.
%K clinoptilolite
%K alkylammonium surfactants
%K sorption of chromate
%U http://www.ptmin.agh.edu.pl/vol37no2/vol37no2_2.pdf