Visible light photocatalysts based on homogeneous and heterogenized tin porphyrins
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SCOPUS
- Title
- Visible light photocatalysts based on homogeneous and heterogenized tin porphyrins
- Authors
- Kim, W; Park, J; Jo, HJ; Kim, HJ; Choi, W
- Date Issued
- 2008-01-17
- Publisher
- AMER CHEMICAL SOC
- Abstract
- Visible light photocatalysis using water-soluble tin porphyrin (s-SnP, [Sn(OH2)(2)((TPyP)-P-H)](NO3)(6)) and water-insoluble tin porphyrin Sn(OH)(2)(TPP) (ins-SnP) immobilized on SiO2 (hetero-SnP) was investigated. The visible light photocatalytic activities of s-SnP and hetero-SnP were demonstrated successfully for the degradation of 4-chlorophenol (4-CP) and acid orange 7 (AO7) in water. The visible light activity of hetero-SnP increased with the ins-SnP loading and was saturated above 77 mg/g-SiO2, which corresponded to the homogeneous concentration of [ins-SnP] = 50 mu M. It is the Q band of SnP (500-650 nm) that is photocatalytically active under visible light, not the Soret band (420-430 nm) whose absorption intensity is much higher. When applied to the degradation of 4-CP and AO7, hetero-SnP was particularly stable and could be used repeatedly without losing the activity whereas the activity of s-SnP was reduced gradually with repeated uses. The photocatalytic degradation reactions of 4-CP, AO7, and other organic substrates were studied systematically to show that the operating mechanisms are very different depending on the kind of substrates. The properties and activities of s-SnP and hetero-SnP as visible light photocatalysts were investigated in various ways and discussed in detail.
- Keywords
- HYDROGEN EVOLUTION; ENVIRONMENTAL APPLICATIONS; DRIVEN PHOTOCATALYST; ELECTRON-TRANSFER; AQUEOUS-SOLUTION; SENSITIZED TIO2; SINGLET OXYGEN; COMPLEXES; DEGRADATION; SYSTEMS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/22998
- DOI
- 10.1021/JP0747151
- ISSN
- 1932-7447
- Article Type
- Article
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY C, vol. 112, no. 2, page. 491 - 499, 2008-01-17
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