模拟太阳光照射下磺胺吡啶的光降解：动力学、机制和毒性演变。
Photodegradation of sulfapyridine under simulated sunlight irradiation: kinetics, mechanism and toxicity evolvement.
机构信息
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
出版信息
Chemosphere. 2014 Mar;99:186-91. doi: 10.1016/j.chemosphere.2013.10.069. Epub 2013 Nov 27.
In this study, the photoinduced degradation of sulfapyridine (SPY) was investigated under simulated light irradiation (λ>200nm). The effect of pH and main water constituents including nitrate ion, bicarbonate, dissolved organic matter (DOM) and iron(III) on the photodegradation was explored. SPY was effectively removed in aqueous solution at pH 8 under UV-vis irradiation, with removal efficiency of 100% within 120min. DOM and iron(III) had retarding influence on the SPY removal, whereas nitrate ion and bicarbonate did not show any obvious effect. Under UV-vis irradiation, the formation of singlet oxygen ((1)O2) accelerated the SPY photodegradation and the contribution of indirect photolysis due to reaction with (1)O2 was up to 42%. The transformation products of SPY were identified by HPLC-MS and the possible photoreaction pathways were proposed. It showed that photoinduced hydrolysis, photo-oxidation via (1)O2 and desulfonation were the main degradation ways for SPY decomposition. Toxicity assays by Vibrio fischeri proved that the transformation products were more toxic than the parent compound.
在这项研究中，在模拟光照（λ>200nm）下研究了磺胺吡啶（SPY）的光诱导降解。探讨了 pH 值以及主要水成分（包括硝酸盐离子、碳酸氢根、溶解有机物（DOM）和铁（III））对光降解的影响。在 pH 值为 8 的水溶液中，在 UV-vis 照射下，磺胺吡啶能有效去除，在 120 分钟内去除率达到 100%。DOM 和铁（III）对 SPY 的去除有延迟影响，而硝酸盐离子和碳酸氢根则没有明显影响。在 UV-vis 照射下，单线态氧（(1)O2）的形成加速了 SPY 的光降解，与(1)O2 反应的间接光解贡献高达 42%。通过 HPLC-MS 鉴定了磺胺吡啶的转化产物，并提出了可能的光反应途径。结果表明，光诱导水解、通过(1)O2的光氧化和脱硫是 SPY 分解的主要降解途径。发光菌（Vibrio fischeri）的毒性试验证明，转化产物比母体化合物毒性更大。
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