DOI: 10.1180/claymin.1974.010.4.02. Surface acidity of imogolite and allophane

Surface acidity of imogolite and allophane

10.1180/claymin.1974.010.4.02

Crossref journal-article

Mineralogical Society

Clay Minerals (7149)

Abstract

AbstractThe acid strength and the number of acid sites on various clays were determined by observing the colouration of Hammett indicators adsorbed on them and by titrating benzene suspensions of them with n-butylamine, respectively. H(Al)-saturated allophane behaves as a strong acid (Ho; −5·6 ∼ 1·5) in a relatively dry environment (relative humidity 10-55%), but its acid strength is very much reduced either by increasing its water content or by saturating it with alkali or alkali earth metal cations. Imogolite shows only a very weak acidity (Ho; 4·6 ∼ 6·8) under medium dry to moist conditions (relative humidity; 30-100%). Both allophane and imogolite show a marked enhancement of acidity (Ho; −8·2 ∼ 1·5) when they have been dried over P2O5 or heated to result in dehydroxylation. H(Al)-saturated montmorillonite, kaolinite and halloysite show stronger acidities (Ho; −5·6 ∼ 1·5) than allophane (Ho; 1·5 ∼ 6·8) in a relatively moist environment (relative humidity; >60%). The n-butylamine titre and CEC show a good agreement for montmorillonite, but a poor agreement for allophane. The latter discrepancy which is larger for allophane when it has been heated at 150 and 300°C, is also found for imogolite when similarly heated. In these titrations, excess butylamine is found in supernatants at end-points. Therefore, the n-butylamine titre as such can not be used for the estimation of the number of acid sites on imogolite and allophane. The origin, structure and transformation of the acid sites on these clays is discussed.

Bibliography

Henmi, T., & Wada, K. (1974). Surface acidity of imogolite and allophane. Clay Minerals, 10(4), 231â245.

Authors 2

T. Henmi (first)
K. Wada (additional)

References 24 Referenced 33

{'key': 'S0009855800022718_ref012', 'first-page': '101', 'volume': '17', 'author': 'Iimura', 'year': '1966', 'journal-title': 'Bull. Nat. Inst. Agric. Sci.'} / Bull. Nat. Inst. Agric. Sci. by Iimura (1966)
10.1021/ja01602a008
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{'key': 'S0009855800022718_ref002', 'first-page': '1024', 'volume': '47', 'author': 'Aomine', 'year': '1962', 'journal-title': 'Am. Miner.'} / Am. Miner. by Aomine (1962)
{'key': 'S0009855800022718_ref019', 'first-page': '561', 'volume': '1', 'author': 'Wada', 'year': '1969', 'journal-title': 'Proc. Int. Clay Conf. Tokyo,'} / Proc. Int. Clay Conf. Tokyo, by Wada (1969)
10.1038/physci240187a0
{'key': 'S0009855800022718_ref024', 'first-page': '329', 'volume': '42', 'author': 'Yoshida', 'year': '1971', 'journal-title': 'J. Sci. Soil Manure, Japan,'} / J. Sci. Soil Manure, Japan, by Yoshida (1971)
10.1016/S0065-2113(08)60266-7
{'key': 'S0009855800022718_ref014', 'first-page': '187', 'volume': '12', 'author': 'Miyauchi', 'year': '1966', 'journal-title': 'Soil Sci. PI. Nutr. Tokyo,'} / Soil Sci. PI. Nutr. Tokyo, by Miyauchi (1966)
10.1021/ja01159a025
{'key': 'S0009855800022718_ref020', 'first-page': '50', 'volume': '54', 'author': 'Wada', 'year': '1969', 'journal-title': 'Am. Miner.'} / Am. Miner. by Wada (1969)
{'key': 'S0009855800022718_ref023', 'first-page': '483', 'volume': '41', 'author': 'Yoshida', 'year': '1970', 'journal-title': 'J. Sci. Soil Manure, Japan,'} / J. Sci. Soil Manure, Japan, by Yoshida (1970)
{'key': 'S0009855800022718_ref009', 'first-page': '563', 'volume': '3', 'author': 'Fieldes', 'year': '1960', 'journal-title': 'N.Z. Jl. Sci.'} / N.Z. Jl. Sci. by Fieldes (1960)
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10.2465/minerj1953.1.278
{'key': 'S0009855800022718_ref017', 'first-page': '305', 'volume': '9', 'author': 'Tsuzuki', 'year': '1961', 'journal-title': 'J. Earth Sci. Nagoya Univ.'} / J. Earth Sci. Nagoya Univ. by Tsuzuki (1961)
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{'key': 'S0009855800022718_ref022', 'first-page': '32', 'volume': '1', 'author': 'Yamamoto', 'year': '1960', 'journal-title': 'Clay Sci.'} / Clay Sci. by Yamamoto (1960)
10.1346/CCMN.1972.0200304
10.1111/j.1151-2916.1959.tb14314.x

Dates

Type	When
Created	18 years, 8 months ago (Dec. 7, 2006, 11:46 p.m.)
Deposited	6 years, 2 months ago (May 29, 2019, 12:38 p.m.)
Indexed	1 month, 4 weeks ago (June 24, 2025, 6:49 a.m.)
Issued	50 years, 8 months ago (Dec. 1, 1974)
Published	50 years, 8 months ago (Dec. 1, 1974)
Published Online	7 years, 1 month ago (July 9, 2018)
Published Print	50 years, 8 months ago (Dec. 1, 1974)

Funders 0

None

BibTeX

@article{Henmi_1974, title={Surface acidity of imogolite and allophane}, volume={10}, ISSN={1471-8030}, url={http://dx.doi.org/10.1180/claymin.1974.010.4.02}, DOI={10.1180/claymin.1974.010.4.02}, number={4}, journal={Clay Minerals}, publisher={Mineralogical Society}, author={Henmi, T. and Wada, K.}, year={1974}, month=dec, pages={231–245} }

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