TY - JOUR
T1 - Photocatalytic oxidation of VX simulant 2-(butylamino)ethanethiol
AU - Vorontsov, Alexandre V.
AU - Chen, Yi Chuan
AU - Smirniotis, Panagiotis G.
N1 - Funding Information:
We gratefully acknowledge the support of the US Department of Army Young Investigator Program under grant No. DAAD 19-00-1-0399, and NATO Science for Peace Programme via the grant SfP 974209. We also acknowledge funding from the Ohio Board of Regents (OBR) that provided matching funds for equipment to the NSF CTS-9619392 grant through the OBR Action Fund #333. Partial support of Russian Science Support Foundation and grant NSh 1484.2003.3 is acknowledged.
PY - 2004/9/10
Y1 - 2004/9/10
N2 - Photocatalytic oxidation of 2-(butylamino)ethanethiol (BAET) was undertaken in aqueous suspension of TiO2 Hombikat UV 100 and Degussa P25 under different initial reaction conditions in order to determine the best parameters for the fastest mineralization of the substrate. BAET is considered to be a simulant for the VX chemical warfare agent. The application of ultrasound had only a small positive effect on the BAET photocatalytic degradation. The highest mineralization rate of 0.433 mg/(l min) was found in unbuffered TiO2 Degussa P25 suspension with initial pH value of about 9.4, TiO2 concentration 500 mg/l and the initial BAET concentration 1000 mg/l. Decreasing of the initial solution pH to 6.1 or below stops the mineralization of BAET while increasing of pH to about 11 drastically changed the degradation profile. At this initial pH, the first 100 min of reaction led to only oxidation of sulfur moiety and organic intermediates accumulated in the solution. Thereafter, mineralization of the products started. The main detected volatile product was butyl aldehyde and the main polar one was 2-(butylamino) acetic acid. In the case of TiO2 Hombikat UV 100, conversion of TOC at initial pH 11 exceeded that at initial pH 9.1. For Degussa P25, the starting pH 9.4 was the best for TOC conversion. The results can be used for treatment of water from pollutants with aliphatic nitrogen and sulfur atoms.
AB - Photocatalytic oxidation of 2-(butylamino)ethanethiol (BAET) was undertaken in aqueous suspension of TiO2 Hombikat UV 100 and Degussa P25 under different initial reaction conditions in order to determine the best parameters for the fastest mineralization of the substrate. BAET is considered to be a simulant for the VX chemical warfare agent. The application of ultrasound had only a small positive effect on the BAET photocatalytic degradation. The highest mineralization rate of 0.433 mg/(l min) was found in unbuffered TiO2 Degussa P25 suspension with initial pH value of about 9.4, TiO2 concentration 500 mg/l and the initial BAET concentration 1000 mg/l. Decreasing of the initial solution pH to 6.1 or below stops the mineralization of BAET while increasing of pH to about 11 drastically changed the degradation profile. At this initial pH, the first 100 min of reaction led to only oxidation of sulfur moiety and organic intermediates accumulated in the solution. Thereafter, mineralization of the products started. The main detected volatile product was butyl aldehyde and the main polar one was 2-(butylamino) acetic acid. In the case of TiO2 Hombikat UV 100, conversion of TOC at initial pH 11 exceeded that at initial pH 9.1. For Degussa P25, the starting pH 9.4 was the best for TOC conversion. The results can be used for treatment of water from pollutants with aliphatic nitrogen and sulfur atoms.
KW - Chemical warfare agents
KW - Mineralization
KW - Photocatalysis
KW - Ultrasound
UR - http://www.scopus.com/inward/record.url?scp=16644368957&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2004.05.027
DO - 10.1016/j.jhazmat.2004.05.027
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C2 - 15363518
AN - SCOPUS:16644368957
SN - 0304-3894
VL - 113
SP - 89
EP - 95
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
IS - 1-3
ER -