Dichromate and permanganate-anions adsorption by Shankanai deposite organo-zeolite

Abstract

Nowadays the ways of water reservoirs and enterprises wastewater purification from accumulated toxic substances are being widely studied. Zeolites and different surfactants based composites had
shown effectiveness in wastewater treatment processes from various organic pollutants, especially phenol and its derivatives, and other compounds of organic nature. However, there is very little data on the
ability of adsorption of inorganic anions by such sorbents. Therefore, the purpose of this study was to
create a sorbent based on zeolite and surfactants and to study the possibility of its use for the adsorption of heavy metal anions (bichromate and permanganate anions). This paper describes the process of
obtaining composite materials based on natural zeolite from the Shankai field. To increase the sorption
activity of the zeolite, ammonium didodecyldimethylbromide surfactant was used. The optimal condi-
tions for the preparation of sorbents (surfactant concentration, the effect of acid treatment of the zeolite)
and the sorption process of the mentioned anions were determined. The most effective was a sorbent
based on zeolite, pretreated with hydrochloric acid with further modification of the surfactant. It was
found that the resulting sorbent is capable of extracting up to 75% of manganese anions and 80% of
chromium anions from aqueous solutions and can be used as a sorbent for the extraction of inorganic
anions (bichromate and permanganate) from aqueous solutions.
Key words: zeolite, surfactant, adsorption, dichromate anion, permanganate anion.