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Clay Minerals; June 2002; v. 37; no. 2; p. 337-344; DOI: 10.1180/0009855023720037
© 2002 Mineralogical Society of Great Britain and Ireland
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A microstructural study of acid-activated montmorillonite from Choushan, China

HONGPING HE1,*, JIUGAO GUO1, XIANDE XIE1, HONGFU LIN2 and LIYUN LI3

1 Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou, 510640, 2 Zhejiang Foreign Trade Company for Industrial Minerals, Hangzhou 310000, and 3 Laboratory of Magnetic Resonance and Atom and Molecular Physics, Wuhan Institute of Physics, Chinese Academy of Sciences, Wuhan 430071, P. R. China

* E-mail: hehp{at}gig.ac.cn

(Received 1 June 2001; revised 10 October 2001)

Bentonite samples from Choushan treated at various acid concentrations were studied using chemical analysis, XRD, 29Si and 27Al MAS NMR to investigate the microstructure of the activated montmorillonites. Two types of structural units were formed during the activation: (1) (SiO)3SiOH, in which up to 15% of Si is bound; (2) Q4(0Al), a major building unit when the acid concentration is >10%. A significant 27Al signal at 55.0 ppm was recorded for both untreated montmorillonite and (to a much greater extent) in acid-treated montmorillonites. 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.

KEYWORDS: bentonite, montmorillonite, acid activation, Chousan, China




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 Clays and Clay MineralsHome page
M. S. Hassan and H. M. Baioumy
STRUCTURAL AND CHEMICAL ALTERATION OF GLAUCONITE UNDER PROGRESSIVE ACID TREATMENT
Clays and Clay Minerals, August 1, 2006; 54(4): 491 - 499.
[Abstract] [Full Text] [PDF]


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