Mn-smectites: Hydrothermal synthesis and characterization

Shoji Higashi; Hitomi Miki; Sridhar Komarneni

doi:10.1016/j.clay.2007.01.016

Mn-smectites: Hydrothermal synthesis and characterization

Shoji Higashi, Hitomi Miki, Sridhar Komarneni

Research output: Contribution to journal › Article › peer-review

24 Scopus citations

Abstract

Three varieties of Mn-smectites (hectorite, stevensite and saponite) were hydrothermally synthesized for the first time using silicic acid, MnCO₃ and Al(NO₃)₃·9H₂O mixed with aqueous solutions of NaOH or LiOH. The staring materials were treated in the temperature range of 125-200 °C for 72-168 h and the best synthesis temperature was found to be 175 °C. A lower Mn/Si molar composition than stoichiometric ideal composition was found to be most effective for the formation of almost pure and crystalline phases, apparently high Si is needed for their stability. Powder X-ray diffraction (XRD) and thermal properties of the Mn-hectorite product have been investigated and compared to those of Zn-hectorite, which was previously synthesized by us. Manganese hectorite showed slightly larger expandability upon glycerol treatment and lower dehydroxylation temperature in the range of 300-450 °C by DTA and TG as compared to Zn-hectorite.

Original language	English (US)
Pages (from-to)	104-112
Number of pages	9
Journal	Applied Clay Science
Volume	38
Issue number	1-2
DOIs	https://doi.org/10.1016/j.clay.2007.01.016
State	Published - Dec 2007

All Science Journal Classification (ASJC) codes

Water Science and Technology
Geochemistry and Petrology
Geology
Soil Science

Access to Document

10.1016/j.clay.2007.01.016

Cite this

@article{5382bdab349f4cc1b8e89c806c30b979,

title = "Mn-smectites: Hydrothermal synthesis and characterization",

abstract = "Three varieties of Mn-smectites (hectorite, stevensite and saponite) were hydrothermally synthesized for the first time using silicic acid, MnCO3 and Al(NO3)3·9H2O mixed with aqueous solutions of NaOH or LiOH. The staring materials were treated in the temperature range of 125-200 °C for 72-168 h and the best synthesis temperature was found to be 175 °C. A lower Mn/Si molar composition than stoichiometric ideal composition was found to be most effective for the formation of almost pure and crystalline phases, apparently high Si is needed for their stability. Powder X-ray diffraction (XRD) and thermal properties of the Mn-hectorite product have been investigated and compared to those of Zn-hectorite, which was previously synthesized by us. Manganese hectorite showed slightly larger expandability upon glycerol treatment and lower dehydroxylation temperature in the range of 300-450 °C by DTA and TG as compared to Zn-hectorite.",

author = "Shoji Higashi and Hitomi Miki and Sridhar Komarneni",

year = "2007",

month = dec,

doi = "10.1016/j.clay.2007.01.016",

language = "English (US)",

volume = "38",

pages = "104--112",

journal = "Applied Clay Science",

issn = "0169-1317",

publisher = "Elsevier B.V.",

number = "1-2",

}

TY - JOUR

T1 - Mn-smectites

T2 - Hydrothermal synthesis and characterization

AU - Higashi, Shoji

AU - Miki, Hitomi

AU - Komarneni, Sridhar

PY - 2007/12

Y1 - 2007/12

N2 - Three varieties of Mn-smectites (hectorite, stevensite and saponite) were hydrothermally synthesized for the first time using silicic acid, MnCO3 and Al(NO3)3·9H2O mixed with aqueous solutions of NaOH or LiOH. The staring materials were treated in the temperature range of 125-200 °C for 72-168 h and the best synthesis temperature was found to be 175 °C. A lower Mn/Si molar composition than stoichiometric ideal composition was found to be most effective for the formation of almost pure and crystalline phases, apparently high Si is needed for their stability. Powder X-ray diffraction (XRD) and thermal properties of the Mn-hectorite product have been investigated and compared to those of Zn-hectorite, which was previously synthesized by us. Manganese hectorite showed slightly larger expandability upon glycerol treatment and lower dehydroxylation temperature in the range of 300-450 °C by DTA and TG as compared to Zn-hectorite.

AB - Three varieties of Mn-smectites (hectorite, stevensite and saponite) were hydrothermally synthesized for the first time using silicic acid, MnCO3 and Al(NO3)3·9H2O mixed with aqueous solutions of NaOH or LiOH. The staring materials were treated in the temperature range of 125-200 °C for 72-168 h and the best synthesis temperature was found to be 175 °C. A lower Mn/Si molar composition than stoichiometric ideal composition was found to be most effective for the formation of almost pure and crystalline phases, apparently high Si is needed for their stability. Powder X-ray diffraction (XRD) and thermal properties of the Mn-hectorite product have been investigated and compared to those of Zn-hectorite, which was previously synthesized by us. Manganese hectorite showed slightly larger expandability upon glycerol treatment and lower dehydroxylation temperature in the range of 300-450 °C by DTA and TG as compared to Zn-hectorite.

UR - http://www.scopus.com/inward/record.url?scp=36849065286&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=36849065286&partnerID=8YFLogxK

U2 - 10.1016/j.clay.2007.01.016

DO - 10.1016/j.clay.2007.01.016

M3 - Article

AN - SCOPUS:36849065286

SN - 0169-1317

VL - 38

SP - 104

EP - 112

JO - Applied Clay Science

JF - Applied Clay Science

IS - 1-2

ER -

Mn-smectites: Hydrothermal synthesis and characterization

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this