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| The efficiency and mechanism of ultrasonic tylosin degradation |
| Received:August 13, 2017 Revised:November 06, 2017 |
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| KeyWord:antibiotic;tylosin (TYL);ultrasonic degradation;advanced oxidation;mineral |
| Author Name | Affiliation | E-mail | | SHU Xiao-hua | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China | | | ZHANG Qian | School of Life and Environmental Science, Guilin University of Electronic Technology, Guilin 541006, China | qzhang0613@163.com | | YANG Chen | College of Environment and Energy, South China University of Technology, Guangzhou 510006, China | | | XU Zi-fu | School of Life and Environmental Science, Guilin University of Electronic Technology, Guilin 541006, China | | | WEI Hui-hua | School of Life and Environmental Science, Guilin University of Electronic Technology, Guilin 541006, China | | | LIANG Ying | School of Life and Environmental Science, Guilin University of Electronic Technology, Guilin 541006, China | | | MO De-qing | School of Life and Environmental Science, Guilin University of Electronic Technology, Guilin 541006, China | |
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| Abstract: |
| In order to study the effect of ultrasonic waves on the removal of macrolide antibiotics from a water body, the influences of the initial concentration, pH value of the solution, ultrasonic power, and ultrasonic treatment time on ultrasonic degradation were investigated using the common veterinary antibiotic, tylosin(TYL). Moreover, combining H2O2 or montmorillonite with ultrasonic treatment was carried out in order to investigate the combined function of TYL degradation. On this basis, an ultrasonic degradation mechanism of TYL was also proposed in this paper. The results showed that ultrasonic treatment could degrade TYL effectively. The TYL degradation rate was 72% with an initial concentration of 10 mg·L-1 TYL, pH of 11, ultrasonic power of 280 W, and ultrasonic treatment time of 90 min. The ultrasonic degradation of TYL was noticeably inhibited by the addition of the free radical scavenger. Moreover, the concentration of free radicals was positively correlated with the degradation rate of TYL under experimental conditions. These results indicated that the free radical played an important role in the ultrasonic degradation of TYL, and the oxidation of a hydroxyl radical may be the main mechanism of ultrasonic degradation. A synergistic phenomenon for the ultrasonic degradation of TYL was observed after an appropriate amount of H2O2/montmorillonite was added to the solution. The degradation efficiency of TYL was enhanced under both conditions. The ultrasonic degradation rate of TYL reached 80.9% and 93.9% when H2O2 or montmorillonite were combined with ultrasonic treatment, respectively. Direct oxidation and promotion of ·OH occurred in the process of combining H2O2 with ultrasonic treatment. For montmorillonite, the synergism mechanism might be due to the effect on ·OH concentration by adsorption characteristics and Fe2O3 in montmorillonite. The synergy of combined ultrasound degradation for antibiotics cannot be attributed solely to the oxidation of hydroxyl radicals, and it is closely related to the characteristics of any added substances. The results indicated that macrolide antibiotics could be removed efficiently by an appropriate ultrasound method. The application of ultrasound in the treatment of antibiotics wastewater should be considered. |
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