A microstructural study of acid-activated montmorillonite from Choushan, China

被引:43
作者
He, HP [1 ]
Guo, JG
Xie, XD
Lin, HF
Li, LY
机构
[1] Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China
[2] Zhejiang Foreign Trade Co Ind Minerals, Hangzhou 310000, Peoples R China
[3] Chinese Acad Sci, Wuhan Inst Phys, Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China
关键词
bentonite; montmorillonite; acid activation; Chousan; China;
D O I
10.1180/0009855023720037
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
Bentonite samples from Choushan treated at various acid concentrations were studied using chemical analysis, XRD, Si-29 and Al-27 MAS NMR to investigate the microstructure of the activated montmorillonites. Two types of structural units were formed during the activation: (1) (SiO)(3)SiOH, in which up to 15% of Si is bound; (2) Q(4)(0Al), a major building unit when the acid concentration is >10%. A significant Al-27 signal at 55.0 ppm was recorded for both untreated montmorillonite and (to a much greater extent) in acid-treated inommorillonites. This was interpreted as arising from four-fold coordinated Al located in the 'bulk' octahedral sheet of montmorillonite. In the course of activation, the removal of one of a pair of octahedral Al ions from montmorillonite removes two hydroxyl groups and leaves the other Al of the pair in four-fold coordination.
引用
收藏
页码:337 / 344
页数:8
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