Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 2884-2892 |
| Seitenumfang | 9 |
| Fachzeitschrift | Studies in Surface Science and Catalysis |
| Jahrgang | 154 C |
| Publikationsstatus | Veröffentlicht - 2004 |
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
- Chemische Verfahrenstechnik (insg.)
- Katalyse
- Physik und Astronomie (insg.)
- Physik der kondensierten Materie
- Chemie (insg.)
- Physikalische und Theoretische Chemie
- Werkstoffwissenschaften (insg.)
- Oberflächen, Beschichtungen und Folien
- Werkstoffwissenschaften (insg.)
- Werkstoffchemie
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in: Studies in Surface Science and Catalysis, Jahrgang 154 C, 2004, S. 2884-2892.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › 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 - 2004
Y1 - 2004
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 -