Photocatalytic degradation of paraoxon-ethyl in aqueous solution using titania nanoparticulate film

详细信息    查看全文

• 作者：G.K. Prasad ; ^{gkprasad2001@yahoo.com} ; P.V.R.K. Ramacharyulu ; J. Praveen Kumar ; A.R. Srivastava ; Beer Singh
• 关键词：Paraoxon-ethyl ; Photocatalysis ; Degradation ; Nano titania ; Sol&ndash ; gel deposition ; Nano particulate film
• 刊名：Thin Solid Films
• 出版年：2012
• 出版时间：30 June, 2012
• 年：2012
• 卷：520
• 期：17
• 页码：5597-5601
• 全文大小：953 K

文摘

Photocatalytic degradation of paraoxon-ethyl (o,o-diethyl o-(4-nitrophenyl) phosphate), a well known surrogate of chemical warfare agents, in aqueous solution was studied by using titania nanoparticulate film. Reaction followed pseudo first order behaviour. Photolytic degradation reaction of paraoxon-ethyl demonstrated relatively low rate with a value of rate constant of 2.5 ¡Á 10^?#xA0;3 min^?#xA0;1. Whereas, degradation reaction in the presence of titania nanoparticulate film and UV light displayed enhanced rate with a value of rate constant of 6.9 ¡Á 10^?#xA0;3 min^?#xA0;1 due to photocatalysis. Gas chromatography-mass spectrometry analysis showed the formation of p-nitrophenol, o,o-diethyl phosphonic acid, o-ethyl, diphosphonic acid, phosphoric acid, dimerized product of o,o-diethyl phosphonic acid, acetaldehyde, and carbon dioxide due to photocatalytic degradation of paraoxon-ethyl. It indicates that, photocatalytic degradation reaction begins with destruction of P-O-C bonds. Subsequently, P, C atoms were found to be oxidized gradually, and contributed to its photocatalytic degradation.