Sonolysis and mineralization of pentachlorophenol by means of varying parameters

Abstract： Degradation effect of organic pollutant on pentachlorophenol(PCP) is researched by ultrasound. PCP is treated by low frequency(16 kHz) and high frequency(800±1 kHz), and bi-frequency . The results of investigation on the ultrasonic destruction of PCP showed that the rate of PCP degradation at the same conditions is the highest at bi-frequency, and the lowest at 16 kHz. In the presence of Fenton type reagent the degradation rate of PCP is highest at bi-frequency (20.93 times) as compared to the stirring system. This ratio is 4.91 and 1.06 at 800 kHz and 16 kHz, respectively. The studies showed the bi-frequency is an effective method for pollutants degradation, but it is need make further study. Taking 800 kHz for example, under the same conditions, the smaller pH of the solution, the higher is the reaction rate. A similar situation applied to TOC, but the TOC removal lags behind degradation of PCP. This indicated the PCP is not completely mineralized. The ultrasound is somewhat enhanced for degradation of PCP and mineralization with only addition of CuSO4, but the combination of ultrasound and Fenton type reagent is effective method for PCP degradation and mineralization. The rate of PCP degradation and TOC removal appeared to follow pseudo-first-order reaction kinetic law. 作 者： SHEN Zhuang-zhi    CHENG Jian-zheng    WU Sheng-ju   作者單位： SHEN Zhuang-zhi(Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080,China; Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China.)

CHENG Jian-zheng(Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071)

WU Sheng-ju(Applide Acoustic Institute,Shaanxi Normal University,Xi'an 710062,China) 

期 刊： 環境科學學報(英文版)  ISTICSCI   Journal： JOURNAL OF ENVIRONMENTAL SCIENCES  年，卷(期)： 2004, 16(3)  分類號： X505 X121  Keywords： sonochemistry    Fenton type reagent    bi-frequency    pentachlorophenol hydroxyl radical