Formation of manganese oxide shells on silica spheres with various crystal structures using surfactants for the degradation of methylene blue dye

Jun Hwan Park, Inseok Jang, Boseong Kwon, Seong Cheol Jang, Seong-Geun Oh

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

In this research, silica-Mn oxide nanocomposites with a stable core-shell structure were prepared successfully by adding a Mn aqueous solution containing Mn nitrate, CTAB, and t-butanol into the colloid of spherical silica particles under basic condition. Mn oxide shells with a range of thickness from 7.92 nm to 29.89 nm could be formed on the surface of silica nanoparticles by changing the concentrations of TEOS and Mn nitrate as the precursors of silica and Mn oxide. As the higher concentration of Mn nitrate was added into the colloid of smaller silica particles, the Mn oxide shell became thicker. In addition, the crystal structure and the surface characteristics of silica-Mn oxide nanocomposites could be controlled efficiently by varying the calcination temperature. When the products were calcined at 500 °C and 800 °C, the pure crystal phase and the improved crystallinity of Mn3O4 and Mn 2O3 in the composites could be obtained, respectively. Through this synthetic process, the thickness of Mn oxide shell could be increased up to 34.40 nm. The formed silica-Mn oxide composite particles were characterized by using FE-SEM, TEM, XRD, EDS, and BET. The catalytic performances of composites for the degradation of methylene blue (MB) in water were investigated in the presence of H2O2 at 25 °C. The silica-Mn3O4 composite particles synthesized through calcination at 500 °C for 6 h showed the highest catalytic activity for the degradation of MB. The degradation efficiencies of composites for MB were analyzed by using UV-vis spectrophotometer.

Original languageEnglish
Pages (from-to)469-475
Number of pages7
JournalMaterials Research Bulletin
Volume48
Issue number2
DOIs
StatePublished - 2013 Feb 1

Fingerprint

Shells (structures)
Manganese oxide
manganese oxides
Methylene Blue
methylene blue
Surface-Active Agents
Silicon Dioxide
Oxides
Surface active agents
Coloring Agents
Dyes
Crystal structure
dyes
surfactants
Silica
degradation
silicon dioxide
Degradation
crystal structure
oxides

Keywords

  • A. Composites
  • B. Chemical synthesis
  • C. X-ray diffraction
  • D. Catalytic properties
  • D. Crystal structure

Cite this

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title = "Formation of manganese oxide shells on silica spheres with various crystal structures using surfactants for the degradation of methylene blue dye",
abstract = "In this research, silica-Mn oxide nanocomposites with a stable core-shell structure were prepared successfully by adding a Mn aqueous solution containing Mn nitrate, CTAB, and t-butanol into the colloid of spherical silica particles under basic condition. Mn oxide shells with a range of thickness from 7.92 nm to 29.89 nm could be formed on the surface of silica nanoparticles by changing the concentrations of TEOS and Mn nitrate as the precursors of silica and Mn oxide. As the higher concentration of Mn nitrate was added into the colloid of smaller silica particles, the Mn oxide shell became thicker. In addition, the crystal structure and the surface characteristics of silica-Mn oxide nanocomposites could be controlled efficiently by varying the calcination temperature. When the products were calcined at 500 °C and 800 °C, the pure crystal phase and the improved crystallinity of Mn3O4 and Mn 2O3 in the composites could be obtained, respectively. Through this synthetic process, the thickness of Mn oxide shell could be increased up to 34.40 nm. The formed silica-Mn oxide composite particles were characterized by using FE-SEM, TEM, XRD, EDS, and BET. The catalytic performances of composites for the degradation of methylene blue (MB) in water were investigated in the presence of H2O2 at 25 °C. The silica-Mn3O4 composite particles synthesized through calcination at 500 °C for 6 h showed the highest catalytic activity for the degradation of MB. The degradation efficiencies of composites for MB were analyzed by using UV-vis spectrophotometer.",
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Formation of manganese oxide shells on silica spheres with various crystal structures using surfactants for the degradation of methylene blue dye. / Park, Jun Hwan; Jang, Inseok; Kwon, Boseong; Jang, Seong Cheol; Oh, Seong-Geun.

In: Materials Research Bulletin, Vol. 48, No. 2, 01.02.2013, p. 469-475.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Formation of manganese oxide shells on silica spheres with various crystal structures using surfactants for the degradation of methylene blue dye

AU - Park, Jun Hwan

AU - Jang, Inseok

AU - Kwon, Boseong

AU - Jang, Seong Cheol

AU - Oh, Seong-Geun

PY - 2013/2/1

Y1 - 2013/2/1

N2 - In this research, silica-Mn oxide nanocomposites with a stable core-shell structure were prepared successfully by adding a Mn aqueous solution containing Mn nitrate, CTAB, and t-butanol into the colloid of spherical silica particles under basic condition. Mn oxide shells with a range of thickness from 7.92 nm to 29.89 nm could be formed on the surface of silica nanoparticles by changing the concentrations of TEOS and Mn nitrate as the precursors of silica and Mn oxide. As the higher concentration of Mn nitrate was added into the colloid of smaller silica particles, the Mn oxide shell became thicker. In addition, the crystal structure and the surface characteristics of silica-Mn oxide nanocomposites could be controlled efficiently by varying the calcination temperature. When the products were calcined at 500 °C and 800 °C, the pure crystal phase and the improved crystallinity of Mn3O4 and Mn 2O3 in the composites could be obtained, respectively. Through this synthetic process, the thickness of Mn oxide shell could be increased up to 34.40 nm. The formed silica-Mn oxide composite particles were characterized by using FE-SEM, TEM, XRD, EDS, and BET. The catalytic performances of composites for the degradation of methylene blue (MB) in water were investigated in the presence of H2O2 at 25 °C. The silica-Mn3O4 composite particles synthesized through calcination at 500 °C for 6 h showed the highest catalytic activity for the degradation of MB. The degradation efficiencies of composites for MB were analyzed by using UV-vis spectrophotometer.

AB - In this research, silica-Mn oxide nanocomposites with a stable core-shell structure were prepared successfully by adding a Mn aqueous solution containing Mn nitrate, CTAB, and t-butanol into the colloid of spherical silica particles under basic condition. Mn oxide shells with a range of thickness from 7.92 nm to 29.89 nm could be formed on the surface of silica nanoparticles by changing the concentrations of TEOS and Mn nitrate as the precursors of silica and Mn oxide. As the higher concentration of Mn nitrate was added into the colloid of smaller silica particles, the Mn oxide shell became thicker. In addition, the crystal structure and the surface characteristics of silica-Mn oxide nanocomposites could be controlled efficiently by varying the calcination temperature. When the products were calcined at 500 °C and 800 °C, the pure crystal phase and the improved crystallinity of Mn3O4 and Mn 2O3 in the composites could be obtained, respectively. Through this synthetic process, the thickness of Mn oxide shell could be increased up to 34.40 nm. The formed silica-Mn oxide composite particles were characterized by using FE-SEM, TEM, XRD, EDS, and BET. The catalytic performances of composites for the degradation of methylene blue (MB) in water were investigated in the presence of H2O2 at 25 °C. The silica-Mn3O4 composite particles synthesized through calcination at 500 °C for 6 h showed the highest catalytic activity for the degradation of MB. The degradation efficiencies of composites for MB were analyzed by using UV-vis spectrophotometer.

KW - A. Composites

KW - B. Chemical synthesis

KW - C. X-ray diffraction

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