Effects of exchange cations and layer-charge location on cysteine retention by smectites

被引:31
|
作者
Brigatti, MF [1 ]
Lugli, C [1 ]
Montorsi, S [1 ]
Poppi, L [1 ]
机构
[1] Univ Modena & Reggio Emilia, Dept Earth Sci, I-41100 Modena, Italy
关键词
cysteine; CMS source clay SAz-1; FTIR; homoionic smectites; layer charge; thermal analysis; XRD;
D O I
10.1346/CCMN.1999.0470513
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This study investigates the complexes formed between amino acids, which are the natural degradation products of organic matter, and smectites. Thus, the adsorption and desorption behavior of cysteine and Na-, Ca-. Cu-homoionic smectites with different layer-charge location, a montmorillonite. and a beidellite, were studied. The clay samples were treated with Na, Ca, and Cu 1 N solutions and then with a 0.2 M cysteine solution. To test smectite-cysteine stability at acidic pH, the solids obtained were repeatedly treated with distilled water acidified to pH = 5. All treated samples were characterized by thermal, X-ray diffraction, chemical, and infrared analyses. The results showed that: I) Na- and Ca-rich smectites adsorbed and retained small amounts of cysteine, and did not show interlayer cation-cysteine complexes, whereas the amino acid was strongly retained in the interlayer by Cu-rich smectites; 2) d(001)-values for Na- and Ca-rich smectites showed little or no expansion, whereas for the Cu-rich smectites the intercalation of the organic molecule produced a swelling of the structure: 3) the interaction mechanism of homoionic smectites with cysteine in an aqueous medium occurs by weak interactions, (e.g., van der Waals interactions, hydrogen bonding, dipole-dipole interactions, and other electrostatic forces such as entropy-driven hydrophobic bonding). and/or by complexes involving interlayer cations and organic ligands. The formation of a stable chelate complex with the saturating ion permits cysteine to be adsorbed by Cu(II)-rich smectites and to be resistant to migration in soils and groundwaters.
引用
收藏
页码:664 / 671
页数:8
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