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Clay Minerals; March 2001; v. 36; no. 1; p. 115-123
© 2001 Mineralogical Society of Great Britain and Ireland
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Research Paper

Retention of OH-Al complexes by dioctahedral smectites

C. VOLZONE* and L. B. GARRIDO

Centro de Tecnología de Recursos Minerales y Cerámica (CETMIC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), C.C. 49, Cno. Centenario y 506, (1897) M. B. Gonnet, Prov. Buenos Aires, Argentina

* E-mail: volzcris{at}netverk.com.ar

(Received 24 July 1998; revised 14 August 2000)

Dioctahedral smectites (Cheto- and Wyoming-type montmorillonites and a beidellite) were treated with two hydrolysed OH-Al solutions (0.02 M in Al) containing different OH-Al complexes. The ratio of ~3.25 mmol of Al per gram of smectite was used. The total Al and the presence of OH-Al species in solution before and after reaction with smectites were determined by the kinetics of Al-Ferron reaction colour development. The composition of the Al species retained by smectites was not the same as that present in the original solution added. The slow-reacting complexes present in the solution were preferentially adsorbed by dioctahedral smectites. Smectites prepared from slow-reacting polymer solutions showed changes in interlayer separation, b-dimension, order along the c axis and spectroscopic properties, after storage at room temperature. The OH-Al Cheto-type montmorillonite prepared from both solutions showed more retention of Al, best stability at room temperature and after thermal treatment at 550°C than interlayered OH-Al Wyoming-type montmorillonite and OH-Al beidellite smectites.

KEYWORDS: dioctahedral smectites, montmorillointe, beidellite, OH-Al complexes






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