Sorption-desorption behaviour of the amino acids glycine and serine on chemically pretreated alumina

The sorption-desorption behaviour of the amino acids glycine (Gly) and serine (Ser) from 90% ethanol on HCl/HNO 3- and NaOH/KOH-treated alumina of surface-phase pH 3.0–11.0 is investigated. The sorption is found to depend on pH of the substrate surface as well as acid or alkali used for pretreatment...

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Bibliographic Details
Published in:Journal of colloid and interface science 1988-10, Vol.125 (2), p.420-427
Main Authors: Moitra, Shipra, 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:The sorption-desorption behaviour of the amino acids glycine (Gly) and serine (Ser) from 90% ethanol on HCl/HNO 3- and NaOH/KOH-treated alumina of surface-phase pH 3.0–11.0 is investigated. The sorption is found to depend on pH of the substrate surface as well as acid or alkali used for pretreatment. Sorption is found to increase in the pH range 3.0–7.0 and then a gradual decrease occurs at pH 6.5–11.0. Maximum sorption is shown at pH 6.0–7.0. The process is fast and almost athermic (20°–50°C). Desorption efficacy and retarding influence on the adsorption by electrolytes is in the order AlCl 3 Al(NO 3) 3 > MgCl 2 Mg(NO 3) 2 > CH 3COONa > NaCl NaNO 3 . It appears that the controlling force for sorption is predominantly ion-exchange.
ISSN:0021-9797
1095-7103
DOI:10.1016/0021-9797(88)90005-7