Aerobic removal of iodinated contrast medium by nano-sized zero-valent iron: A combination of oxidation and reduction
Aerobic removal of iodinated contrast medium by nano-sized zero-valent iron: A combination of oxidation and reduction
复制标题
纳米零价铁有氧去除碘造影剂：氧化与还原的结合
DOI：
10.1016/j.jhazmat.2019.03.107
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发表时间：
2019
影响因子：
13.6
通讯作者：
Zhang L.-S.
中科院分区：
文献类型：
--
作者：
Zhou G.-N.;He C.-S.;Wang Y.-X.;He P.-P.;Liu J.;Mu Y.;Zhang L.-S.
研究了好氧条件下纳米零价铁(NZVI)对水中典型的碘化造影剂泛影葡胺(DTA)的去除性能及其机理。用电子自旋共振和高效电喷雾电离串联质谱仪分别检测了活性氧物种和转化产物。此外，还考察了几个操作参数对DTA去除效果的影响。结果表明，在氧气存在下，nZVI的脱除DTA能力远高于微米级零价铁(MZVI)。此外，ROS和I-−的检测以及中间产物的分析表明，在好氧条件下，nZVI对DTA的去除是氧化和还原途径相结合的。此外，高剂量的nZVI和酸性条件对DTA的去除有促进作用，而nZVI的老化以及溶液中的氯离子和硝酸根离子对nZVI在有氧条件下降解DTA有负面影响。
The removal performance and mechanisms of diatrizoate (DTA), a typical iodinated contrast medium, from water by nano-sized zero-valent iron (nZVI) under aerobic conditions were investigated in this study. Reactive oxygen species (ROS) and transformation products were detected with electron spin resonance and liquid chromatography electrospray ionization tandem mass spectrometry, respectively. Furthermore, the effects of several operational parameters on DTA removal were illustrated. The results showed that nZVI had a much higher DTA removal ability compared to microscale zero-valent iron (mZVI) in the presence of oxygen. Moreover, the detection of ROS and I−as well as the analysis of intermediate products suggested a combination of oxidation and reduction pathways for DTA removal by nZVI under aerobic conditions. Additionally, a high dosage of nZVI and acidic conditions led to the enhancement of DTA removal, while nZVI aging, as well as chloride and nitrate ions in the solution, had negative effects on the degradation of DTA by nZVI in the presence of oxygen.