Preparation and characterization of magnetic-core titanium dioxide: Implications for photocatalytic removal of ibuprofen

Kyounglim Kang, Min Jang, Mingcan Cui, Pengpeng Qiu, Beomguk Park, Shane A Snyder, Jeehyeong Khim

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Magnetically separable titanium dioxides (MSTs) were synthesized from nano-magnetite (Fe3O4), tetraethyl orthosilicate (TEOS), and titanium butoxide (TBT) using a sol-gel process, and their activity in the photocatalytic oxidation of ibuprofen (IBP) was evaluated. Transmission electron microscopy-energy dispersive spectroscopy (TEM-EDS) revealed that the thickness of TiO2 layers was linearly dependent on the TBT content, producing predictable results. As the ratio of TBT (mL) to TEOS (mL) increased, the purity of the TiO2 layers of the prepared MSTs increased owing to the absence of Si compounds. Based on TEM-EDS, X-ray diffraction, Fourier transform infrared, and X-ray photoelectron spectroscopy analyses, TiO2 in MSTs was successfully coated on the surface of amorphous SiO2 with Fe3O4 as the core. Magnetization of the MSTs declined exponentially with increasing thickness of the non-magnetic SiO 2-TiO2 layer. The optimal loading and activation energy of MSTs were also determined for photocatalytic removal of IBP. Comparison of the kinetic constants suggests a positive relationship between photocatalytic activity and surface area. Increased aggregation of the MSTs with higher magnetization values was attributed to stronger magnetic dipole-dipole interactions. The results of this study provide an in-depth understanding of the synthesis of magnetically separable catalysts satisfying the requirements of both magnetic separation and photocatalytic activity with potential application in the removal of recalcitrant organic pollutants.

Original languageEnglish (US)
Pages (from-to)178-186
Number of pages9
JournalJournal of Molecular Catalysis A: Chemical
Volume390
DOIs
StatePublished - 2014

Fingerprint

Magnetic cores
magnetic cores
Ibuprofen
Titanium
titanium oxides
Titanium dioxide
tetraethyl orthosilicate
titanium
preparation
Energy dispersive spectroscopy
Magnetization
Ferrosoferric Oxide
Transmission electron microscopy
magnetization
Magnetic separation
transmission electron microscopy
Organic pollutants
Magnetite
sol-gel processes
magnetic dipoles

Keywords

  • Ibuprofen
  • Magnetically separable titanium dioxide
  • Magnetization
  • Oxidation
  • Pharmaceutical

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry
  • Process Chemistry and Technology

Cite this

Preparation and characterization of magnetic-core titanium dioxide : Implications for photocatalytic removal of ibuprofen. / Kang, Kyounglim; Jang, Min; Cui, Mingcan; Qiu, Pengpeng; Park, Beomguk; Snyder, Shane A; Khim, Jeehyeong.

In: Journal of Molecular Catalysis A: Chemical, Vol. 390, 2014, p. 178-186.

Research output: Contribution to journalArticle

Kang, Kyounglim ; Jang, Min ; Cui, Mingcan ; Qiu, Pengpeng ; Park, Beomguk ; Snyder, Shane A ; Khim, Jeehyeong. / Preparation and characterization of magnetic-core titanium dioxide : Implications for photocatalytic removal of ibuprofen. In: Journal of Molecular Catalysis A: Chemical. 2014 ; Vol. 390. pp. 178-186.
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AB - Magnetically separable titanium dioxides (MSTs) were synthesized from nano-magnetite (Fe3O4), tetraethyl orthosilicate (TEOS), and titanium butoxide (TBT) using a sol-gel process, and their activity in the photocatalytic oxidation of ibuprofen (IBP) was evaluated. Transmission electron microscopy-energy dispersive spectroscopy (TEM-EDS) revealed that the thickness of TiO2 layers was linearly dependent on the TBT content, producing predictable results. As the ratio of TBT (mL) to TEOS (mL) increased, the purity of the TiO2 layers of the prepared MSTs increased owing to the absence of Si compounds. Based on TEM-EDS, X-ray diffraction, Fourier transform infrared, and X-ray photoelectron spectroscopy analyses, TiO2 in MSTs was successfully coated on the surface of amorphous SiO2 with Fe3O4 as the core. Magnetization of the MSTs declined exponentially with increasing thickness of the non-magnetic SiO 2-TiO2 layer. The optimal loading and activation energy of MSTs were also determined for photocatalytic removal of IBP. Comparison of the kinetic constants suggests a positive relationship between photocatalytic activity and surface area. Increased aggregation of the MSTs with higher magnetization values was attributed to stronger magnetic dipole-dipole interactions. The results of this study provide an in-depth understanding of the synthesis of magnetically separable catalysts satisfying the requirements of both magnetic separation and photocatalytic activity with potential application in the removal of recalcitrant organic pollutants.

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