Details
| Original language | English |
|---|---|
| Pages (from-to) | 2884-2892 |
| Number of pages | 9 |
| Journal | Studies in Surface Science and Catalysis |
| Volume | 154 C |
| Publication status | E-pub ahead of print - 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.
Keywords
- Functionalization, Photo-oxidation, Phthalocyanine, SBA-15, Si-MCM-41, Sulfides
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
- Physics and Astronomy(all)
- Condensed Matter Physics
- Chemistry(all)
- Physical and Theoretical Chemistry
- Materials Science(all)
- Surfaces, Coatings and Films
- Materials Science(all)
- Materials Chemistry
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In: Studies in Surface Science and Catalysis, Vol. 154 C, 02.09.2007, p. 2884-2892.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Immobilization and photo catalytic properties of phthalocyanines anchored to the surface of Si-MCM-41 and SBA-15
AU - Bartels, O.
AU - Wöhrle, D.
AU - Caro, J.
AU - Wark, M.
PY - 2007/9/2
Y1 - 2007/9/2
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.
AB - 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.
KW - Functionalization
KW - Photo-oxidation
KW - Phthalocyanine
KW - SBA-15
KW - Si-MCM-41
KW - Sulfides
UR - http://www.scopus.com/inward/record.url?scp=11844288931&partnerID=8YFLogxK
U2 - 10.1016/s0167-2991(04)80568-8
DO - 10.1016/s0167-2991(04)80568-8
M3 - Article
AN - SCOPUS:11844288931
VL - 154 C
SP - 2884
EP - 2892
JO - Studies in Surface Science and Catalysis
JF - Studies in Surface Science and Catalysis
SN - 0167-2991
ER -