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超声化学降解水溶液中的氧氟沙星。

Sonochemical degradation of ofloxacin in aqueous solutions.

机构信息

Department of Civil & Environmental Engineeering, University of Cyprus, 75 Kallipoleos St, 1678 Nicosia, Cyprus.

出版信息

Water Sci Technol. 2010;61(12):3141-6. doi: 10.2166/wst.2010.921.

Abstract

The use of low frequency (20 kHz), high energy ultrasound for the degradation of the antibiotic ofloxacin in water was investigated. Experiments were performed with a horn-type ultrasound generator at varying applied power densities (130-640 W/L), drug concentrations (5-20 mg/L), hydrogen peroxide concentrations (0-100 mM) and sparging gases (air, oxygen, nitrogen and argon). In general, conversion (which was assessed following sample absorbance at 288 nm) increased with increasing ultrasound energy and peroxide concentration and decreasing initial drug concentration. Moreover, reactions under an argon atmosphere were faster than with diatomic gases, possibly due to argon's physical properties (e.g. solubility, thermal conductivity and specific heat ratio) favoring sonochemical activity. Overall, low to moderate levels of ofloxacin degradation were achieved (i.e. it never exceeded 50%), thus indicating that radical reactions in the liquid bulk rather than thermal reactions in the vicinity of the cavitation bubble are responsible for ofloxacin degradation.

摘要

研究了低频(20 kHz)、高能超声波在水中降解抗生素氧氟沙星的应用。采用号角式超声波发生器进行了实验,研究了不同应用功率密度(130-640 W/L)、药物浓度(5-20 mg/L)、过氧化氢浓度(0-100 mM)和气体(空气、氧气、氮气和氩气)对反应的影响。一般来说,转化率(通过 288nm 处的样品吸光度评估)随着超声能量和过氧化物浓度的增加以及初始药物浓度的降低而增加。此外,在氩气气氛下的反应速度比双原子气体快,这可能是由于氩气的物理性质(如溶解度、热导率和比热容比)有利于声化学活性。总的来说,氧氟沙星的降解程度较低(即从未超过 50%),这表明液体中的自由基反应而不是空化泡附近的热反应是氧氟沙星降解的原因。

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