文献类型：期刊文献

英文题名：Sonochemical degradation of organophosphorus pesticide in dilute aqueous solutions

作者：Farooq, Robina[1]; Lin, Feng-kai[1]; Shaukat, S.F.[2]; Huang, Jian-jun[1]

机构：[1]E China Univ Sci & Technol, Coll Resources & Environm Engn, Shanghai 200237, Peoples R China;[2]Govt Coll, Dept Phys, Lahore, Pakistan

年份：2003

卷号：15

期号：5

起止页码：710

外文期刊名：JOURNAL OF ENVIRONMENTAL SCIENCES

收录：;EI(收录号：2003427670634);WOS:【SCI-EXPANDED(收录号:WOS:000185051200023)】；

语种：英文

外文关键词：sonochemical degradation; omethoate pesticide; sonolysis; role of inert gases

摘要：Ultrasonic irradiation was found to accelerate the rate of hydrolysis of omethoate in aqueous solution over the pH range of 2-12. Process parameters studied include pH, steady-state temperature, concentration; and the type of gases. Greater than 96% hydrolysis was observed in 30 minutes through this process and the rate of destruction increased with the help of more soluble and low thermal inert gas. So with Krypton, omethoate was found to undergo rapid destruction as compared with Argon. In the presence of ultrasound, the observed first-order rate of hydrolysis of omethoate is found to be independent of pH. The formation of transient supercritical water(SCW) appears to be an important factor in the acceleration of chemical reactions in the presence of ultrasound. A detailed chemical reaction mechanism for omethoate destruction in water was formulated. Experimental results and theoretical kinetic mechanism demonstrated that the most of the omethoate undergo destruction inside the cavitating holes. A very less effect of temperature on the degradation of omethoate within a temperature range of 20-70degreesC proves that a small quantity of omethoate undergoes secondary destruction in the bulk liquid.