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 language | English |
|---|---|
| Title of host publication | ACS, Division of Environmental Chemistry - Preprints of Extended Abstracts |
| Pages | 263-267 |
| Number of pages | 5 |
| Volume | 44 |
| Edition | 2 |
| Publication status | Published - 2004 |
| Externally published | Yes |
| Event | 228th ACS National Meeting - Philadelphia, PA, United States Duration: 2004 Aug 22 → 2004 Aug 26 |
Other
| Other | 228th ACS National Meeting |
|---|---|
| Country | United States |
| City | Philadelphia, PA |
| Period | 04/8/22 → 04/8/26 |
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ASJC Scopus subject areas
- Energy(all)
Cite this
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 proceeding › Conference contribution
}
TY - GEN
T1 - Photocatalytic degradation reactions of aquatic nitrogenous organic compounds using pure and modified titania
AU - Choi, Wonyong
AU - Lee, Jaesang
PY - 2004
Y1 - 2004
N2 - 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).
AB - 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).
UR - http://www.scopus.com/inward/record.url?scp=23644454667&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=23644454667&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:23644454667
VL - 44
SP - 263
EP - 267
BT - ACS, Division of Environmental Chemistry - Preprints of Extended Abstracts
ER -