Degradation of linuron by ultrasound combined with photo-Fenton treatment
Degradation of linuron by ultrasound combined with photo-Fenton treatment
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DOI：
10.1016/j.cej.2010.10.073
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发表时间：
2011-01
影响因子：
15.1
通讯作者：
H. Katsumata;Takuya Kobayashi;S. Kaneco;Tohru Suzuki;K. Ohta
中科院分区：
文献类型：
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作者：
H. Katsumata;Takuya Kobayashi;S. Kaneco;Tohru Suzuki;K. Ohta
在Fe（II）存在下，对苯基脲类除草剂利谷隆进行了声化学光降解。Fe（II）初始浓度和溶液pH值对降解速率有很大影响，最佳Fe（II）浓度为1.2×10− 4 molL − 1，最佳pH值为3.0。在最佳条件下，超声/Fe（II）/UV体系对10 mgL-1的利谷隆在20 min后完全降解，而超声辐照下利谷隆的降解率仅为79.3%。此外，超声//Fe（II）/UV过程的一级速率常数（0.17min-1）比单独超声（0.08min-1）大约2倍。结合过程中，由于利谷隆的矿化作用，TOC降低。利谷隆在120 min后完全矿化。在降解过程中，观察到氯离子、亚硝酸根和硝酸根离子作为最终产物的形成。基于这些结果，超声/Fe（II）/UV系统将是有用的技术处理含利谷隆的水样。
Sonochemical photodegradation of linuron, which is one of phenylurea herbicides, was carried out in the presence of Fe(II). The degradation rate was strongly influenced by initial concentration of Fe(II) and solution pH. The optimal Fe(II) concentration and pH were found to be 1.2×10−4molL−1and 3.0, respectively. An initial linuron concentration of 10mgL−1was completely degraded by ultrasound/Fe(II)/UV system after 20min under the optimum conditions while only 79.3% of linuron was decomposed under ultrasonic irradiation. Furthermore, the first-order rate constant in ultrasound//Fe(II)/UV process (0.17min−1) was about 2 times greater than that in ultrasonic alone (0.08min−1). The decrease of TOC as a result of mineralization of linuron was observed during the combination process. The complete linuron mineralization was achieved after 120min. The formations of chloride, nitrite and nitrate ions as end-products were observed during the degradation system. Based on these results, ultrasound/Fe(II)/UV system would be useful technology for the treatment of water samples containing linuron.