Sorption—desorption studies of anionic dyes on alumina pretreated with acids

Sorption—desorption of the anionic dyes Trypan blue and Orange “G” on chromatographic alumina, pretreated with acids (HNO 3, H 2SO 4), is reported in this paper. The sorption is found to vary with pH of the substrate (1.0–8.8), acid used for pretreatment, time (10 min–144 h), and temperature (30–60°...

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Bibliographic Details
Published in:Journal of colloid and interface science 1989-04, Vol.129 (1), p.41-52
Main Authors: Mishra, Ramesh K, Mundhara, G.L, Tiwari, J.S
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Solid-liquid interface
Surface physical chemistry
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Summary:Sorption—desorption of the anionic dyes Trypan blue and Orange “G” on chromatographic alumina, pretreated with acids (HNO 3, H 2SO 4), is reported in this paper. The sorption is found to vary with pH of the substrate (1.0–8.8), acid used for pretreatment, time (10 min–144 h), and temperature (30–60°C). Regeneration studies with aqueous electrolytes showed desorption efficacy in the order PO 4 3− > SO 4 2− > NO 3 −. The acid treatment, and hence the specifically adsorbed anions (NO 3 −, SO 4 2−), appear to modify the adsorptive behavior of alumina significantly. Predominant ion-exchange behavior is postulated. The observations were utilized in the column chromatography of the two dyes, using inorganic electrolytes as eluents.
ISSN:0021-9797
1095-7103
DOI:10.1016/0021-9797(89)90414-1