Immobilization and photo catalytic properties of phthalocyanines anchored to the surface of Si-MCM-41 and SBA-15

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Autoren

  • O. Bartels
  • D. Wöhrle
  • J. Caro
  • M. Wark

Organisationseinheiten

Externe Organisationen

  • Universität Bremen
Forschungs-netzwerk anzeigen

Details

OriginalspracheEnglisch
Seiten (von - bis)2884-2892
Seitenumfang9
FachzeitschriftStudies in Surface Science and Catalysis
Jahrgang154 C
PublikationsstatusElektronisch veröffentlicht (E-Pub) - 2 Sept. 2007

Abstract

Tetrasulfo-phthalocyanine dye molecules acting as singlet oxygen generators for photo-oxidations were immobilized in mesoporous Si-MCM-41 or SBA-15 molecular sieves. The extraction stable fixation was achieved by either covalent or ionic bonding in the pores of differently modified hosts. Modification of the mesoporous hosts Si-MCM-41 or SBA-15 with N-trimethoxysilyl-propyl-N,N,N- trimethylammonium chloride provides a material that is suitable for ionic grafting of negatively charged dyes, which exhibit less aggregation compared with covalently grafted dyes. In addition, the grafting procedure is simplified. The obtained composite materials show photo-catalytic activity in the oxidation of sulfide anions in aqueous solutions. Since the photo-oxidation is most active in the region of pH 8-10 the use of SBA-15 as carrier is highly preferable due to its thicker pore walls providing an improved stability in basic media. However, photo bleaching of the photo-sensitizer itself is a serious problem.

ASJC Scopus Sachgebiete

Zitieren

Immobilization and photo catalytic properties of phthalocyanines anchored to the surface of Si-MCM-41 and SBA-15. / Bartels, O.; Wöhrle, D.; Caro, J. et al.
in: Studies in Surface Science and Catalysis, Jahrgang 154 C, 02.09.2007, S. 2884-2892.

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Bartels, O, Wöhrle, D, Caro, J & Wark, M 2007, 'Immobilization and photo catalytic properties of phthalocyanines anchored to the surface of Si-MCM-41 and SBA-15', Studies in Surface Science and Catalysis, Jg. 154 C, S. 2884-2892. https://doi.org/10.1016/s0167-2991(04)80568-8
Bartels, O., Wöhrle, D., Caro, J., & Wark, M. (2007). Immobilization and photo catalytic properties of phthalocyanines anchored to the surface of Si-MCM-41 and SBA-15. Studies in Surface Science and Catalysis, 154 C, 2884-2892. Vorabveröffentlichung online. https://doi.org/10.1016/s0167-2991(04)80568-8
Bartels O, Wöhrle D, Caro J, Wark M. Immobilization and photo catalytic properties of phthalocyanines anchored to the surface of Si-MCM-41 and SBA-15. Studies in Surface Science and Catalysis. 2007 Sep 2;154 C:2884-2892. Epub 2007 Sep 2. doi: 10.1016/s0167-2991(04)80568-8
Bartels, O. ; Wöhrle, D. ; Caro, J. et al. / Immobilization and photo catalytic properties of phthalocyanines anchored to the surface of Si-MCM-41 and SBA-15. in: Studies in Surface Science and Catalysis. 2007 ; Jahrgang 154 C. S. 2884-2892.
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abstract = "Tetrasulfo-phthalocyanine dye molecules acting as singlet oxygen generators for photo-oxidations were immobilized in mesoporous Si-MCM-41 or SBA-15 molecular sieves. The extraction stable fixation was achieved by either covalent or ionic bonding in the pores of differently modified hosts. Modification of the mesoporous hosts Si-MCM-41 or SBA-15 with N-trimethoxysilyl-propyl-N,N,N- trimethylammonium chloride provides a material that is suitable for ionic grafting of negatively charged dyes, which exhibit less aggregation compared with covalently grafted dyes. In addition, the grafting procedure is simplified. The obtained composite materials show photo-catalytic activity in the oxidation of sulfide anions in aqueous solutions. Since the photo-oxidation is most active in the region of pH 8-10 the use of SBA-15 as carrier is highly preferable due to its thicker pore walls providing an improved stability in basic media. However, photo bleaching of the photo-sensitizer itself is a serious problem.",
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AU - Bartels, O.

AU - Wöhrle, D.

AU - Caro, J.

AU - Wark, M.

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N2 - Tetrasulfo-phthalocyanine dye molecules acting as singlet oxygen generators for photo-oxidations were immobilized in mesoporous Si-MCM-41 or SBA-15 molecular sieves. The extraction stable fixation was achieved by either covalent or ionic bonding in the pores of differently modified hosts. Modification of the mesoporous hosts Si-MCM-41 or SBA-15 with N-trimethoxysilyl-propyl-N,N,N- trimethylammonium chloride provides a material that is suitable for ionic grafting of negatively charged dyes, which exhibit less aggregation compared with covalently grafted dyes. In addition, the grafting procedure is simplified. The obtained composite materials show photo-catalytic activity in the oxidation of sulfide anions in aqueous solutions. Since the photo-oxidation is most active in the region of pH 8-10 the use of SBA-15 as carrier is highly preferable due to its thicker pore walls providing an improved stability in basic media. However, photo bleaching of the photo-sensitizer itself is a serious problem.

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