pH值和DO对UVA-LED光降解氧氟沙星的影响:动力学、机理及路径
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X52

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国家自然科学基金(51108481);中央高校基本科研业务费(106112016CDJXY210008);重庆市基础科学与前沿技术研究项目(cstc2017jcyj AX0206)


Influence of pH and DO on UVA-LED photodegradation of ofloxacin: Kinetics, mechanism and pathway
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    摘要:

    在UVA-LED光照射下,考察了氧氟沙星在不同的pH值(3、7、11)和溶解氧浓度(DO=9、0 mg/L)条件下超纯水中的光降解过程。结果表明:其光降解过程符合一级反应动力学,主要为直接光降解,DO存在时,自敏化光降解有显著促进作用。在不同DO条件下,其光降解效率及速率均在pH值为7时最快,pH值为11时次之,pH值为3时最慢,氧氟沙星的光量子产率随pH值变化而变化是导致差异产生的主要原因。对降解产物及其生成过程进行分析表明,氧氟沙星的降解路径为脱甲基、哌嗪环的裂解和氧化、羟基化和脱羧基反应,不同pH值和DO条件下的降解路径及其产物差别细微,但其对产物在降解过程中的生成和进一步降解随时间的变化有显著影响。研究成果阐明了pH值和DO对氧氟沙星光降解的影响。

    Abstract:

    The photodegradation process of ofloxacin in ultrapure water at different pH (3,7 and 11) and dissolved oxygen concentration (DO=9 and 0 mg/L) was investigated under UVA-LED irradiation. The results showed that the photodegradation follows first-order-kinetics, mainly direct photolysis. When dissolved oxygen exists, the self-sensitized photolysis could significantly promote the photodegradation. Under different DO conditions, the photodegradation efficiency and rate were the fastest at pH=7, followed by pH=11 and the slowest at pH=3. The main reason for the difference is that the photonic yield of ofloxacin varies with pH value. The analysis of degradation products and their formation process showed that the degradation pathways of ofloxacin was mainly demethylation, piperazinyl ring cleavage/oxidation, hydroxylation and decarboxylation. The degradation pathways and products of ofloxacin under different pH and DO conditions were slightly different, but have a significant influence on the process of products generation and further degradation over time. The above research results clarified the effects of pH and DO on the photodegradation of ofloxacin.

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姚娟娟,甘敬业,夏彬. pH值和DO对UVA-LED光降解氧氟沙星的影响:动力学、机理及路径[J].土木与环境工程学报(中英文),2020,42(3):141-148.

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  • 收稿日期:2019-10-11
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  • 在线发布日期: 2020-06-13
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