Sorption of basic and acid dyes from aqueous solutions onto oxihumolite

Naturally occurring kind of weathered and oxidised young brown coal called oxihumolite was used for an adsorptive removal of basic (Methylene Blue, Malachite Green) as well as acid (Egacid Orange, Midlon Black) dyes from waters. It was shown that both kinds of dyes can be sorbed onto oxihumolite. Th...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2005-05, Vol.59 (6), p.881-886
Main Authors: JANOS, Pavel, SEDIVY, Pavel, RYZNAROVA, Milena, GRÖTSCHELOVA, Sylvie
Format: Article
Language:English
Subjects:
Acid dyes
Adsorption
Applied sciences
Azo Compounds - chemistry
Azo Compounds - isolation & purification
Basic dyes
Benzenesulfonates
Coal
Coloring Agents - chemistry
Coloring Agents - isolation & purification
Exact sciences and technology
Hydrogen-Ion Concentration
Industrial wastewaters
Methylene Blue - chemistry
Methylene Blue - isolation & purification
Oxihumolite
Pollution
Rosaniline Dyes - chemistry
Rosaniline Dyes - isolation & purification
Sodium Chloride - chemistry
Solutions - chemistry
Sorption
Wastewater treatment
Wastewaters
Water Purification - methods
Water treatment and pollution
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Summary:Naturally occurring kind of weathered and oxidised young brown coal called oxihumolite was used for an adsorptive removal of basic (Methylene Blue, Malachite Green) as well as acid (Egacid Orange, Midlon Black) dyes from waters. It was shown that both kinds of dyes can be sorbed onto oxihumolite. The maximum sorption capacities determined from the parameters of Langmuir isotherms ranged from 0.070 mmol g −1 (for Midlon Black) to 0.278 mmol g −1 (for Malachite Green) and did not differ significantly for basic and acid dyes. The dye sorption (except of Midlon Black) increased in the presence of inorganic salt. Non-ionic surfactants, and surfactants bearing the same charge as the dye exhibited only a minor effect on the dye sorption, whereas oppositely charged surfactants enhanced the dye sorption to a certain extent. The pH value of the aqueous phase exhibited rather pronounced effect on the sorption of acid dyes causing a suppression of the sorption with increasing pH. The sorption of basic dyes, on the other hand, remained almost unchanged in the examined pH range. Oxihumolite is recommended for the treatment of acid wastewaters because of its limited stability in alkaline aqueous solutions.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2004.11.018