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Transformation of Montmorillonite to Nickel-Chlorite

Published online by Cambridge University Press:  01 July 2024

G. C. Gupta  and
W. U. Malik
G. C. Gupta*
Affiliation:
University Chemistry Department, Roorkee, India
W. U. Malik
Affiliation:
University Chemistry Department, Roorkee, India
*
*Present address: School of Engineering, University of Mississippi, University, Miss., 39216.
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Abstract

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Nickel-chlorite has been obtained by the co-precipitation of nickelous hydrous oxide and montmorillonite at an OH/Ni ratio of 2.0. Chemical analysis shows that 16 me of Ni is fixed per gram of clay. System without any free nickelous hydrous oxide is quite stable up to an investigated period of 6 months, shows impedence to collapse on heating to 550°C, and no expansion of 001 spacing on glycerol treatment.

Different properties studied (X-ray diffraction analysis, thermal [D.T.A. and T.G.A.] data, i.r. absorption analysis, Polarographic reduction behavior and cation exchange capacity measurements) confirm the complete transformation of montmorillonite to nickel-chlorite.

“Seeding” of the hydroxide out of the “fixed” interlayer positions takes place on ageing the sample with free nickelous hydrous oxide. No montmorillonite could be detected by X-ray diffraction analysis in spite of this backward reaction.

Резюме

Резюме

Никелевый хлорит был получен путем соосаждения гидроокиси никеля и монтмо-риллонита при отношении ОН: Ni = 2:1. По данным химического анализа, 1 г. глины поглощал 16 миллиэквивалентов никеля. Полученный продукт, не содержащий свободной гидроокиси никеля, является совершенно стабильным в течение 6 месяцев (длительность исследования), обнаруживает признаки начинающегося распада при нагревании до 550°С, при его обработке глицерином значение расстояния 001 не увеличивается.

Результаты рентгеновского изучения, термического анализа (ДТА, ТГА), инфракрасной спектроскопии, полярографической редукции (определение обменного никеля) и изучения способности к обмену катионов подтверждают полное превращение монтмориллонита в никелевый хлорит.

При старении осадка, содержащего свободную гидроокись никеля, последняя обособляется и оказывается не связанной с определенными межслоевыми позициями; несмотря на этот обратный процесс, в том же веществе монтмориллонит рентгеновским методом не обнаружен.

Type
Research Article
Information
Clays and Clay Minerals , Volume 17 , Issue 4 , August 1969 , pp. 233 - 239
Copyright
Copyright © 1969, The Clay Minerals Society

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