Photocatalytic degradation of phenolic pollutants over TiO{sub 2} semiconductor with various structures
- National Taiwan Univ., Taipei (Taiwan, Province of China)
The photocatalytic activities of titanium oxides with various structures in the decomposition of phenolic pollutants in aqueous solutions were studied. The structures of titanium oxide included crystalline anatase and rutile TiO{sub 2} phase either commercially available or laboratory-made, layered titanates, small titanium oxide crystallites pillared in the clay interlayers, and titanium oxide impregnated on silica gel. The catalytic activities were compared based on the same titanium content as 0.01 g TiO{sub 2} suspended in 50 mL of 1.25 mM aqueous solutions containing phenolic compounds, with O{sub 2} gas of 10 mL/min as oxidant and illumination with 300 nm UV radiation. The reactions adopted the Langmuir-Hinshelwood kinetics model. The results showed that high conversion was observed over the commercialized anatase, laboratory-made TiO{sub 2} of anatase or rutile phase, and the silica gel supported TiO{sub 2}. For laboratory-made anatase and rutile, the activities were changed with calcination temperatures, probably clue to the variation in particle sizes. On the other hand, the activities of all the catalysts with layered structures were low. The strong interaction between the charged surfaces and the phenolic intermediates was proposed to be the main reason for coke formation and low activities over commercialized rutile and the layered catalysts.
- OSTI ID:
- 214597
- Report Number(s):
- CONF-950801-; TRN: 96:000922-0066
- Resource Relation:
- Conference: 210. national meeting of the American Chemical Society (ACS), Chicago, IL (United States), 20-25 Aug 1995; Other Information: PBD: 1995; Related Information: Is Part Of 210th ACS national meeting. Part 1 and 2; PB: 1866 p.
- Country of Publication:
- United States
- Language:
- English
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