Comparative Study on Photocatalytic Oxidation of Four Organophosphorus Simulants of Chemical Warfare Agents in Aqueous Suspension of Titanium Dioxide Full article
| Journal |
Journal of Photochemistry and Photobiology A: Chemistry
ISSN: 1010-6030 , E-ISSN: 1873-2666 |
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| Output data | Year: 2004, Volume: 162, Number: 2-3, Pages: 503-511 Pages count : 9 DOI: 10.1016/S1010-6030(03)00392-7 | ||||
| Tags | Batch reactor, Phosphates, Phosphonates, Photocatalysis, Products, Rate constants, TOC | ||||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | North Atlantic Treaty Organization | SfP-974209 |
Abstract:
Photocatalytic oxidation by oxygen of air was carried out for dimethyl methyl phosphonate (DMMP), trimethyl phosphate (TMP), triethyl phosphate (TEP), and diethyl phosphoramidate (DEPA) in different concentration. The initial rate of organophosphorus compounds consumption increases with the initial concentration at relatively low concentrations but decreases at higher initial concentrations. If the concentration is higher than the concentration in maximum, the rate decreases because of the lack of adsorbed oxygen. These summit-like dependences are well approximated by one site Langmuir–Hinshelwood equation with competitive adsorption of oxygen and organophosphorus compound. Parameters of the Langmuir–Hinshelwood equation are reported. Complete mineralization of the organophosphorus compounds at the end of reaction was evidenced by the total organic carbon concentration profiles. These profiles have sigmoidal shape. GC–MS technique was used to identify intermediates of TEP and TMP oxidation. The main intermediates are dimethyl phosphate and methyl phosphate in the case of TMP and diethyl phosphate and ethyl phosphate in the case of TEP. The set of intermediates shows that photocatalytic oxidation proceeds primarily at α carbon atoms of TEP. The distribution of intermediates corroborates that photocatalytic oxidation is initiated by reaction with hydroxyl radicals.
Cite:
Kozlova E.A.
, Smirniotis P.G.
, Vorontsov A.V.
Comparative Study on Photocatalytic Oxidation of Four Organophosphorus Simulants of Chemical Warfare Agents in Aqueous Suspension of Titanium Dioxide
Journal of Photochemistry and Photobiology A: Chemistry. 2004. V.162. N2-3. P.503-511. DOI: 10.1016/S1010-6030(03)00392-7 WOS Scopus РИНЦ ANCAN OpenAlex
Comparative Study on Photocatalytic Oxidation of Four Organophosphorus Simulants of Chemical Warfare Agents in Aqueous Suspension of Titanium Dioxide
Journal of Photochemistry and Photobiology A: Chemistry. 2004. V.162. N2-3. P.503-511. DOI: 10.1016/S1010-6030(03)00392-7 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Aug 20, 2003 |
| Accepted: | Sep 22, 2003 |
| Published online: | Nov 21, 2003 |
| Published print: | Mar 15, 2004 |
Identifiers:
| Web of science: | WOS:000220468500034 |
| Scopus: | 2-s2.0-1342328832 |
| Elibrary: | 13460612 |
| Chemical Abstracts: | 2004:165022 |
| Chemical Abstracts (print): | 141:131138 |
| OpenAlex: | W1980858534 |