Preparation and porous properties of materials prepared by selective leaching of phlogopite

Kiyoshi Okada, Noriyuki Nakazawa, Yoshikazu Kameshima, Atsuo Yasumori, Jadambaa Temuujin, Kenneth J D MacKenzie, Mark E. Smith

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Porous silica products obtained by selective leaching of phlogopite using an acid solution were investigated by XRD, MAS NMR, SEM, TEM, DTA/TG, and N2 and Ar gas adsorptions. The phlogopite powder was leached by a nitric acid solution at various concentrations (0.01-10 M) at 5-150°C for 10 min-480 h. Selective leaching of the phlogopite powder became extensive when the concentration of nitric acid was >1 M. Only SiO2 remained after the treatment, the other components (MgO, Al2O3, K2O and Fe2O3) being selectively leached from the product. At higher leaching temperatures, the leaching rate became faster and the resulting maximum specific surface area of the porous silica product became larger at each leaching temperature. The porous silica products were found by SEM and TEM, to maintain their original platy particle shape even after the selective leaching. The 29Si MAS NMR spectra of the products, however, revealed that the linkage structure of SiO4 tetrahedra converted to a framework type from a layered type in the original phlogopite. The porous silica product with the maximum specific surface area (532 m2/g) was obtained by leaching in a nitric acid solution with concentration of 5 M at 90°C for 15 min. The pore-size distribution of the porous silica product was bimodal with micropores of ∼0.7 nm and mesopores of ∼4 nm. The pore size of the products changed from 0.7 nm to 4 nm and further to 6 nm with increased leaching time. The present results are discussed in relation to those reported for phlogopite by other workers.

Original languageEnglish
Pages (from-to)624-632
Number of pages9
JournalClays and Clay Minerals
Volume50
Issue number5
DOIs
Publication statusPublished - Oct 2002
Externally publishedYes

Fingerprint

phlogopite
Leaching
leaching
Silicon Dioxide
silica
Nitric Acid
nitric acid
MAS
Specific surface area
Powders
Pore size
nuclear magnetic resonance
transmission electron microscopy
surface area
powders
scanning electron microscopy
Nuclear magnetic resonance
Transmission electron microscopy
micropores
Gas adsorption

Keywords

  • Phlogopite
  • Porous properties
  • Porous silica
  • Selective leaching

ASJC Scopus subject areas

  • Soil Science
  • Earth and Planetary Sciences (miscellaneous)
  • Geochemistry and Petrology
  • Water Science and Technology

Cite this

Okada, K., Nakazawa, N., Kameshima, Y., Yasumori, A., Temuujin, J., MacKenzie, K. J. D., & Smith, M. E. (2002). Preparation and porous properties of materials prepared by selective leaching of phlogopite. Clays and Clay Minerals, 50(5), 624-632. https://doi.org/10.1346/000986002320679503

Preparation and porous properties of materials prepared by selective leaching of phlogopite. / Okada, Kiyoshi; Nakazawa, Noriyuki; Kameshima, Yoshikazu; Yasumori, Atsuo; Temuujin, Jadambaa; MacKenzie, Kenneth J D; Smith, Mark E.

In: Clays and Clay Minerals, Vol. 50, No. 5, 10.2002, p. 624-632.

Research output: Contribution to journalArticle

Okada, K, Nakazawa, N, Kameshima, Y, Yasumori, A, Temuujin, J, MacKenzie, KJD & Smith, ME 2002, 'Preparation and porous properties of materials prepared by selective leaching of phlogopite', Clays and Clay Minerals, vol. 50, no. 5, pp. 624-632. https://doi.org/10.1346/000986002320679503
Okada, Kiyoshi ; Nakazawa, Noriyuki ; Kameshima, Yoshikazu ; Yasumori, Atsuo ; Temuujin, Jadambaa ; MacKenzie, Kenneth J D ; Smith, Mark E. / Preparation and porous properties of materials prepared by selective leaching of phlogopite. In: Clays and Clay Minerals. 2002 ; Vol. 50, No. 5. pp. 624-632.
@article{77b3e06e3fd94b8db90210f1d51ed5d5,
title = "Preparation and porous properties of materials prepared by selective leaching of phlogopite",
abstract = "Porous silica products obtained by selective leaching of phlogopite using an acid solution were investigated by XRD, MAS NMR, SEM, TEM, DTA/TG, and N2 and Ar gas adsorptions. The phlogopite powder was leached by a nitric acid solution at various concentrations (0.01-10 M) at 5-150°C for 10 min-480 h. Selective leaching of the phlogopite powder became extensive when the concentration of nitric acid was >1 M. Only SiO2 remained after the treatment, the other components (MgO, Al2O3, K2O and Fe2O3) being selectively leached from the product. At higher leaching temperatures, the leaching rate became faster and the resulting maximum specific surface area of the porous silica product became larger at each leaching temperature. The porous silica products were found by SEM and TEM, to maintain their original platy particle shape even after the selective leaching. The 29Si MAS NMR spectra of the products, however, revealed that the linkage structure of SiO4 tetrahedra converted to a framework type from a layered type in the original phlogopite. The porous silica product with the maximum specific surface area (532 m2/g) was obtained by leaching in a nitric acid solution with concentration of 5 M at 90°C for 15 min. The pore-size distribution of the porous silica product was bimodal with micropores of ∼0.7 nm and mesopores of ∼4 nm. The pore size of the products changed from 0.7 nm to 4 nm and further to 6 nm with increased leaching time. The present results are discussed in relation to those reported for phlogopite by other workers.",
keywords = "Phlogopite, Porous properties, Porous silica, Selective leaching",
author = "Kiyoshi Okada and Noriyuki Nakazawa and Yoshikazu Kameshima and Atsuo Yasumori and Jadambaa Temuujin and MacKenzie, {Kenneth J D} and Smith, {Mark E.}",
year = "2002",
month = "10",
doi = "10.1346/000986002320679503",
language = "English",
volume = "50",
pages = "624--632",
journal = "Clays and Clay Minerals",
issn = "0009-8604",
publisher = "Clay Minerals Society",
number = "5",

}

TY - JOUR

T1 - Preparation and porous properties of materials prepared by selective leaching of phlogopite

AU - Okada, Kiyoshi

AU - Nakazawa, Noriyuki

AU - Kameshima, Yoshikazu

AU - Yasumori, Atsuo

AU - Temuujin, Jadambaa

AU - MacKenzie, Kenneth J D

AU - Smith, Mark E.

PY - 2002/10

Y1 - 2002/10

N2 - Porous silica products obtained by selective leaching of phlogopite using an acid solution were investigated by XRD, MAS NMR, SEM, TEM, DTA/TG, and N2 and Ar gas adsorptions. The phlogopite powder was leached by a nitric acid solution at various concentrations (0.01-10 M) at 5-150°C for 10 min-480 h. Selective leaching of the phlogopite powder became extensive when the concentration of nitric acid was >1 M. Only SiO2 remained after the treatment, the other components (MgO, Al2O3, K2O and Fe2O3) being selectively leached from the product. At higher leaching temperatures, the leaching rate became faster and the resulting maximum specific surface area of the porous silica product became larger at each leaching temperature. The porous silica products were found by SEM and TEM, to maintain their original platy particle shape even after the selective leaching. The 29Si MAS NMR spectra of the products, however, revealed that the linkage structure of SiO4 tetrahedra converted to a framework type from a layered type in the original phlogopite. The porous silica product with the maximum specific surface area (532 m2/g) was obtained by leaching in a nitric acid solution with concentration of 5 M at 90°C for 15 min. The pore-size distribution of the porous silica product was bimodal with micropores of ∼0.7 nm and mesopores of ∼4 nm. The pore size of the products changed from 0.7 nm to 4 nm and further to 6 nm with increased leaching time. The present results are discussed in relation to those reported for phlogopite by other workers.

AB - Porous silica products obtained by selective leaching of phlogopite using an acid solution were investigated by XRD, MAS NMR, SEM, TEM, DTA/TG, and N2 and Ar gas adsorptions. The phlogopite powder was leached by a nitric acid solution at various concentrations (0.01-10 M) at 5-150°C for 10 min-480 h. Selective leaching of the phlogopite powder became extensive when the concentration of nitric acid was >1 M. Only SiO2 remained after the treatment, the other components (MgO, Al2O3, K2O and Fe2O3) being selectively leached from the product. At higher leaching temperatures, the leaching rate became faster and the resulting maximum specific surface area of the porous silica product became larger at each leaching temperature. The porous silica products were found by SEM and TEM, to maintain their original platy particle shape even after the selective leaching. The 29Si MAS NMR spectra of the products, however, revealed that the linkage structure of SiO4 tetrahedra converted to a framework type from a layered type in the original phlogopite. The porous silica product with the maximum specific surface area (532 m2/g) was obtained by leaching in a nitric acid solution with concentration of 5 M at 90°C for 15 min. The pore-size distribution of the porous silica product was bimodal with micropores of ∼0.7 nm and mesopores of ∼4 nm. The pore size of the products changed from 0.7 nm to 4 nm and further to 6 nm with increased leaching time. The present results are discussed in relation to those reported for phlogopite by other workers.

KW - Phlogopite

KW - Porous properties

KW - Porous silica

KW - Selective leaching

UR - http://www.scopus.com/inward/record.url?scp=0036806367&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036806367&partnerID=8YFLogxK

U2 - 10.1346/000986002320679503

DO - 10.1346/000986002320679503

M3 - Article

VL - 50

SP - 624

EP - 632

JO - Clays and Clay Minerals

JF - Clays and Clay Minerals

SN - 0009-8604

IS - 5

ER -