Dithiol-mediated incorporation of CdS nanoparticles from reverse micellar system into Zn-doped SBA-15 mesoporous silica and their photocatalytic properties
| Autor: | Masanori Nanba, Isao Komasawa, Takayuki Hirai |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Aqueous solution
Inorganic chemistry Nanoparticle Dithiol Mesoporous silica Heterogeneous catalysis Cadmium sulfide Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry chemistry Chemical engineering Copolymer Photocatalysis |
| Zdroj: | Journal of Colloid and Interface Science. 268:394-399 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2003.09.011 |
| Popis: | CdS nanoparticles, as prepared in reverse micellar systems, were incorporated into alkanedithiol-modified Zn-doped SBA-15 mesoporous silica (dtz.sbnd;ZnSBA-15; pore diameter, ca. 4 nm), which were themselves prepared via hydrolysis of tetraethylorthosilicate (TEOS) in the presence of Zn(NO(3))(2) and triblock copolymer, as a nonsurfactant template and pore-forming agent, followed by contact with dithiol molecules. A particle-sieving effect for the dtz.sbnd;ZnSBA-15 was observed, in that the incorporation of the nanoparticles was remarkably decreased with increasing the nanoparticle size. The resulting CdSz.sbnd;ZnSBA-15 composite was then used as photocatalysts for the generation of H(2) from 2-propanol aqueous solution. Under UV irradiation (lambda300 nm), a high photocatalytic activity was observed for this composite material. This is effected by electron transfer from the photoexcited ZnS (dithiol-bonded Zn on SBA-15) to CdS nanoparticles. The photocatalytic activity is increased with a decrease in the number of methylene groups in the dithiol molecules, according to the rank order 1,10-decanedithiol1,6-hexanedithiol1,2-ethanedithiol. |
| Databáze: | OpenAIRE |
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