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Adsorption of l-lysine on montmorillonite
- Source :
-
Colloids & Surfaces A: Physicochemical & Engineering Aspects . Oct2007, Vol. 307 Issue 1-3, p142-149. 8p. - Publication Year :
- 2007
-
Abstract
- Abstract: Amino acid adsorption on smectite is relevant to prebiotic processes involving possible catalytic reactions in the early Solar System, as implied by the clay-organic correlation found in meteorites, and the generation and modification of organic components essential for the origin of life. Here we report the results of a study investigating the adsorption of l-lysine (0.025–0.4M) onto montmorillonite. The reaction products were studied using X-ray diffraction, chemical analysis and infrared spectroscopy. We find that lysine adsorption is first dominated by cation exchange and then by adsorption of electrically neutral lysine (as a zwitterion), as indicated by chemical and FTIR evidence. At the maximum concentration, lysine displaces only ∼1/3 of the original interlayer cations. The d-spacing of the smectite–lysine complex increases from 1.2 to 2.1nm as more lysine enters the interlayer space, and water is expelled. We propose a structural model of lysine sorption in the interlayer in which lysine is oriented at >45–90° to the plane of siloxane O atoms. [Copyright &y& Elsevier]
- Subjects :
- *AMINO acids
*ORGANIC acids
*AMINO acid anhydrides
*AMINO acid chelates
Subjects
Details
- Language :
- English
- ISSN :
- 09277757
- Volume :
- 307
- Issue :
- 1-3
- Database :
- Academic Search Index
- Journal :
- Colloids & Surfaces A: Physicochemical & Engineering Aspects
- Publication Type :
- Academic Journal
- Accession number :
- 26149810
- Full Text :
- https://doi.org/10.1016/j.colsurfa.2007.05.022