Photocatalytic degradation reactions of aquatic nitrogenous organic compounds using pure and modified titania

Wonyong Choi, Jaesang Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

TiO 2 photocatalyst has been very successful in mineralizing aquatic organic pollutants because of the strong oxidation potential of its valence band holes. A study on the photocatalytic degradation reactions of aquatic NH 3, alkylamines, and alkylammoniums using pure and surface-modified TiO 2 was carried out. By using TiO 2 deposited with nano-Pt particles, NH 3 was oxidized selectively to N 2. While the pure TiO 2 almost quantitatively transformed ammonia into nitrite and nitrate, Pt/TiO 2 converted NH 3 into N 2 with reducing the total nitrogen concentration in the suspension. The Pt surface stabilized intermediate NH x species and facilitated their recombination into dinitrogen. The photocatalytic method converted NH 3 to N 2 in a single step. The H-atom abstraction by OH radicals initiated successive demethylation processes to generate tri-, di-, and monomethylammonium/amine as an intermediate and NH 3/NH 4 + as a final product. The OH radical behaviors and the product distribution were closely related and the reaction with OH radicals took place on the TiO 2 surface and in the solution bulk. Results of the study of tetramethylammonium (TMA, (CH 3) 4N +) ions in water using both naked-TiO 2 and fluorinated-TiO 2 were elucidated. This is an abstract of a paper presented at the 228th ACS National Meeting (Philadelphia, PA 8/22-26/2004).

Original languageEnglish
Title of host publicationACS, Division of Environmental Chemistry - Preprints of Extended Abstracts
Pages263-267
Number of pages5
Volume44
Edition2
Publication statusPublished - 2004
Externally publishedYes
Event228th ACS National Meeting - Philadelphia, PA, United States
Duration: 2004 Aug 222004 Aug 26

Other

Other228th ACS National Meeting
CountryUnited States
CityPhiladelphia, PA
Period04/8/2204/8/26

Fingerprint

Organic compounds
Titanium
Degradation
Organic pollutants
Photocatalysts
Valence bands
Ammonia
Amines
Nitrates
Nitrogen
Atoms
Oxidation
Ions
Water

ASJC Scopus subject areas

  • Energy(all)

Cite this

Choi, W., & Lee, J. (2004). Photocatalytic degradation reactions of aquatic nitrogenous organic compounds using pure and modified titania. In ACS, Division of Environmental Chemistry - Preprints of Extended Abstracts (2 ed., Vol. 44, pp. 263-267)

Photocatalytic degradation reactions of aquatic nitrogenous organic compounds using pure and modified titania. / Choi, Wonyong; Lee, Jaesang.

ACS, Division of Environmental Chemistry - Preprints of Extended Abstracts. Vol. 44 2. ed. 2004. p. 263-267.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Choi, W & Lee, J 2004, Photocatalytic degradation reactions of aquatic nitrogenous organic compounds using pure and modified titania. in ACS, Division of Environmental Chemistry - Preprints of Extended Abstracts. 2 edn, vol. 44, pp. 263-267, 228th ACS National Meeting, Philadelphia, PA, United States, 04/8/22.
Choi W, Lee J. Photocatalytic degradation reactions of aquatic nitrogenous organic compounds using pure and modified titania. In ACS, Division of Environmental Chemistry - Preprints of Extended Abstracts. 2 ed. Vol. 44. 2004. p. 263-267
Choi, Wonyong ; Lee, Jaesang. / Photocatalytic degradation reactions of aquatic nitrogenous organic compounds using pure and modified titania. ACS, Division of Environmental Chemistry - Preprints of Extended Abstracts. Vol. 44 2. ed. 2004. pp. 263-267
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