Degradation of azinphos-methyl and chlorpyrifos from aqueous solutions by ultrasound treatment

作者：Agarwal Shilpi; Tyagi Inderjeet; Gupta Vinod Kumar^*; Dehghani Mohammad Hadi; Bagheri Amin; Yetilmezsoy Kaan; Amrane Abdeltif; Heibati Behzad^*; Rodriguez Couto Susana^*

来源：Journal of Molecular Liquids, 2016, 221: 1237-1242.

DOI：10.1016/j.molliq.2016.04.076

• Azinphos methyl
• Chlorpyrifos
• Phosphorous pesticides
• Ultrasound
• Degradation

Azinphos-methyl and chlorpyrifos are the organophosphorous pesticides which pose serious threats to the environment including their detrimental effect on humans and, therefore, their removal from the environment is a must. Hence, in the present paper the ultrasound technique was applied to remove the above-mentioned hazardous compounds. For this, the effect of influential parameters such as pH, initial pesticide concentration, frequency, electric power and treatment time on the ultrasound degradation of azinphos-methyl and chlorpyrifos was well investigated and elucidated. The results obtained showed that azinphos-methyl and chlorpyrifos were effectively and rapidly degraded by the ultrasound technique. Thus, the operating optimal conditions (initial pH 9, initial pesticide concentration 1 mg/L, frequency 130 kHz, electric power 500 Wand treatment time 20 min) lead to a degradation of 78.50% for azinphos-methyl and of 98.96% for chlorpyrifos with in 20 min of contact time. Two multiple regression-based equations were derived to describe the degradation process of the pesticides by the ultrasound treatment. The result of this study showed that the-polynomial equations satisfactorily described the behavior of the present process for various operating conditions.

• 出版日期2016-9