本文關(guān)鍵詞：電子束輻照降解水中氧氟沙星的研究　出處：《中國(guó)環(huán)境科學(xué)》2016年10期 　論文類型：期刊論文

  更多相關(guān)文章： 電子束輻照 氧氟沙星 轉(zhuǎn)化產(chǎn)物 降解途徑

【摘要】：應(yīng)用電子直線加速器初步探索了水體中氧氟沙星的輻照降解影響條件及降解機(jī)理.對(duì)初始濃度為20mg/L的氧氟沙星水溶液進(jìn)行了輻照降解研究,分別選取了0.5kGy,1.0kGy,2.0kGy,3.0kGy,5.0kGy共5個(gè)劑量組,以研究輻照吸收劑量對(duì)降解效率的影響,同時(shí)分別對(duì)氧氟沙星水溶液進(jìn)行空氣飽和(水合電子清除劑)、氮?dú)怙柡�、添�?.005mol/L及0.05mol/L氯化鈉、添加0.05mol/L叔丁醇(羥基自由基清除劑)、添加0.005mol/L碳酸鈉、添加0.005mol/L硫酸鈉等方法進(jìn)行處理,以探究降解過程中輻照水體產(chǎn)生自由基對(duì)氧氟沙星降解的貢獻(xiàn)率.結(jié)果表明,以空氣飽和進(jìn)行處理,可提高氧氟沙星的降解率,輻照吸收劑量為2.0kGy時(shí)降解率可達(dá)99%.反之,加入氯化鈉、叔丁醇和碳酸鈉抑制了氧氟沙星的降解,加入硫酸鈉則影響不大,表明羥基自由基在氧氟沙星降解中起關(guān)鍵作用.通過應(yīng)用超高效液相色譜-質(zhì)譜(UPLC-MS)對(duì)降解產(chǎn)物的分析鑒定,推測(cè)出了氧氟沙星的降解轉(zhuǎn)化途徑.
[Abstract]:The irradiation degradation conditions and degradation mechanism of ofloxacin in water were preliminarily investigated by electron linear accelerator. The irradiation degradation of ofloxacin aqueous solution with initial concentration of 20 mg / L was studied. In order to study the effect of irradiation absorbed dose on degradation efficiency, 0.5 kGy 1.0 kGy 2.0 kGy 2.0 kGy 3.0 kGy 5.0kGy dose groups were selected to study the effect of irradiation absorbed dose on degradation efficiency. At the same time, the solution of ofloxacin was saturated with air (hydrous electron scavenger, nitrogen saturation, 0.005 mol / L and 0.05 mol / L sodium chloride respectively). Adding 0.05mol / L tert-butanol (hydroxyl radical scavenger), adding 0.005mol / L sodium carbonate, adding 0.005mol / L sodium sulfate, etc. In order to explore the contribution of free radicals produced in irradiated water to the degradation of ofloxacin, the results showed that the degradation rate of ofloxacin could be increased by air saturation treatment. The degradation of ofloxacin was inhibited by sodium chloride, tert-butanol and sodium carbonate, but not by sodium sulfate. The results showed that hydroxyl radical played a key role in the degradation of ofloxacin. The degradation products were identified by UPLC-MS. The degradation and transformation pathway of ofloxacin was inferred.
【作者單位】： 北京化工大學(xué)化學(xué)工程學(xué)院化工資源有效利用國(guó)家重點(diǎn)實(shí)驗(yàn)室;中國(guó)科學(xué)院高能物理研究所核技術(shù)應(yīng)用研究中心;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(11405184,11275216,11375212,11575210)
【分類號(hào)】：X703
【正文快照】： 抗生素類藥物主要應(yīng)用于人和動(dòng)物的疾病治療.抗生素的大量使用,不可避免地會(huì)造成抗生素進(jìn)入環(huán)境,帶來環(huán)境污染.抗生素具有抗生物降解能力[1],進(jìn)入水體后會(huì)催生耐抗生素菌[2]并危害水生生物,對(duì)生態(tài)系統(tǒng)構(gòu)成威脅.氧氟沙星是氟喹諾酮類抗菌藥的一種,結(jié)構(gòu)式如圖1所示,它主要用于治

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