Sorption of α-amino-acids by copper montmorillonite

Bodenheimer, W.; Heller, L.

doi:10.1180/claymin.1967.007.2.04

Cited by 17 publications

(8 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…1a,b). As observed by Bodenheimer & Heller (1967), Cu-rich smectites show a greater affinity for glycine. In fact, Cu 2+ as a transition element is more effective in promoting an efficient coordination with the carboxylic and amino groups (Tan et al, 1999).…”

Section: Homoionic Smectite-glycine Complexessupporting

confidence: 51%

“…Factors influencing reactions between smectites and polluted solutions include the layer charge of the clay, pH, the nature and concentration of the adsorbate, temperature, and the presence of competing ions or ligands. Smectites can bind and form stable complexes with organic molecules and transition metals by a variety of mechanisms and can therefore play an important role in heavy metal cycling at the Earth's surface (Bodenheimer & Heller, 1967;Greenland et al, 1962Greenland et al, , 1965Gupta et al, 1983;Johnston, 1996). Bodenheimer & Heller (1967) suggested that in Curich smectites the ratio between the amount of aamino acid sorbed by the mineral and that in solution is inversely related to the total concentra-tion of the amino acid.…”

mentioning

confidence: 99%

“…Smectites can bind and form stable complexes with organic molecules and transition metals by a variety of mechanisms and can therefore play an important role in heavy metal cycling at the Earth's surface (Bodenheimer & Heller, 1967;Greenland et al, 1962Greenland et al, , 1965Gupta et al, 1983;Johnston, 1996). Bodenheimer & Heller (1967) suggested that in Curich smectites the ratio between the amount of aamino acid sorbed by the mineral and that in solution is inversely related to the total concentra-tion of the amino acid. The relationship between amino acid and Cu cations was developed theoretically by Gupta et al (1983) using a semiempirical molecular orbital method.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Interaction between glycine and Na-, Caand Cu-rich smectites

et al. 2000

View full text Add to dashboard Cite

The interactions between glycine and two Na-, Ca- and Cu-exchanged smectites with different layer-charge location were studied. The sorption of glycine depends on the nature of the interlayer cations (Ca < Na < Cu), and on the type of smectite. Sequential extraction procedures were carried out in order to test the possibility of removing metals and/or glycine from the smectite interlayer. By the end of the treatments, the release of the amino acid from the substrates, with the exception of Cu-rich smectite, was virtually complete. The thermal curves of glycine-smectites confirm the stronger bonding of the amino acid with Cu-exchanged samples, and FTIR spectra indicate that glycine is mainly sorbed in the zwitterionic form. The data obtained suggest that in investigations into mechanisms of the binding of metals by minerals and their subsequent mobilization, amino acids merit close attention.

show abstract

Section: Homoionic Smectite-glycine Complexessupporting

confidence: 51%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Interaction between glycine and Na-, Caand Cu-rich smectites

et al. 2000

View full text Add to dashboard Cite

show abstract

“…Dans ce domaine, on a pr~t6 attention ~t l'interaction d'aminoacides avec des silicates phylliteux du groupe des argiles. Ainsi en t6moignent les travaux de Talibudeen (1955), Haxaire (1956), McLaren (1958), Sieskind & Wey (1959), Sieskind (1960Sieskind ( , 1963, Greenland et al (1962Greenland et al ( , 1965, Fripiat et al (1966), et Bodenheimer & Heller (1967, orientEs vers l'explication des ph6nom~nes d'absorption et retention des mol6cules organiques dans l'espace intedamellaire.…”

Section: Introductionunclassified

Complexes vermiculite—aminoacides

Rausell-Colom¹

1971

Clay miner.

View full text Add to dashboard Cite

Vermiculite single crystals immersed in aminoacid solutions of varying concentration and pH, form complexes characterized by discrete basal spacings. Organic molecules enter in the interlayer space as cations and as dipolar ions through mechanisms of ion exchange and dipole adsorption.The basal spacings of the complexes were recorded. Based on these results the possible arrangements of the aminoacid molecules have been discussed.The main assumptions used are: (a) the electropositive groups NH3+ penetrate into the holes formed by the basal oxygens of the silicate; (13) the C-N bonds are perpendicular to the silicate sheets; (c) the hydrogen atoms of the —CH2 groups are directed towards the sheet surfaces; (d) the —COO− and —COOH groups are located in the middle plane of the interlayer space, halfway between the negative structural charges; and (e) double hydrogen bonds are formed between —COOH groups belonging to organic cations adsorbed onto opposite surfaces.In solutions of higher concentration the crystals swell to the gel state. This phenomenon is due to: (a) the different nature of interlayer cohesion after substitution of the inorganic cations by the aminoacid cationic form; and (b) the appearance of repulsive forces between —COO− groups of adsorbed dipoles, that overcome cohesive forces.

show abstract

“…Under alkaline conditions, the Si-O-M-O-Si bonds are more easily broken, so more O-M-(vacant site) coordination cavities are uncovered, which may accommodate the GLY molecules to form a coordination formulation, which is favorable for the loading of GLY on clay. [45][46][47] Also, the hydrogen-bonding interaction between Si-OH and the GLY molecules are contributory to the immobilization of GLY on the hydrothermally treated PAL product. 39,48 The elemental analysis of C, H, and N elements shows that the N content in GLY-PAL is 0.4%, which conrms the existence of GLY molecules in the GLY-PAL product.…”

Section: Effect Of Reaction Parameters On Adsorption Capacitiesmentioning

confidence: 99%