Direct intercalation of amino acids into layered double hydroxides by coprecipitation

被引:242
作者
Aisawa, S [1 ]
Takahashi, S [1 ]
Ogasawara, W [1 ]
Umetsu, Y [1 ]
Narita, E [1 ]
机构
[1] Iwate Univ, Fac Engn, Dept Chem Engn, Morioka, Iwate 0208551, Japan
关键词
layered double hydroxide; intercalation; coprecipitation; amino acids; organic-inorganic hybrid materials; thermal decomposition; catalytic action;
D O I
10.1006/jssc.2001.9340
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
First, the direct intercalation of amino acids into various layered double hydroxides (Mg-Al, Mn-Al, Ni-Al, Zn-Al, and Zn-Cr LDHs) by coprecipitation has been investigated using phenylalanine (Phe) as a guest amino acid. The degree of Phe coprecipitation was strongly influenced by the solution pH and kind of LDH system and reached a maximum in the pH 8-10 region. The solid products were found to have an expanded LDH structure, which supported the belief that Phe was intercalated into LDHs as an amphoteric ion or anion. Two kinds of configuration for Phe in the gallery, either vertical (Mn-Al, Zn-Al, and Zu-Cr LDHs) or horizontal (Mg-Al LDH) in orientation were observed. Only in the Ni-Al systems, the solid product was the mixture of Phe/Ni-Al LDH and Phe/Ni(OH)(2) composite. Next, the thermal decomposition of the intercalated Phe was revealed to be accelerated by the catalytic action of metal ions in the host basal layer. The formation of Phe/Mg-Al, Mn-Al, and Zn-Al LDHs was also elucidated as being appreciably different by the kind of LDH system. Moreover, for various amino acids, the degree of coprecipitation was found to be strongly influenced by amino acid sidechains, i.e., length, structure, and physicochemical properties. (C) 2001 Academic Press.
引用
收藏
页码:52 / 62
页数:11
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