Affiliations: Institute of Acoustics, Chinese Academy of Sciences,
Beijing 100080, China | Wuhan Institute of Physics and Mathematics, Chinese
Academy of Sciences, Wuhan 430071 | Applide Acoustic Institute, Shaanxi Normal University,
Xi'an 710062, China
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 CuSO_4, 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.
Keywords: sonochemistry, Fenton type reagent, bi-frequency, pentachlorophenol hydroxyl radical
