Enhanced hydrodeiodination of iodinated contrast medium by sulfide-modified nano-sized zero-valent iron: Kinetics, mechanisms and application prospects
Enhanced hydrodeiodination of iodinated contrast medium by sulfide-modified nano-sized zero-valent iron: Kinetics, mechanisms and application prospects
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硫化物改性纳米零价铁增强碘造影剂加氢脱碘反应动力学、机理及应用前景
DOI：
10.1016/j.cej.2020.126050
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发表时间：
2020-12
影响因子：
15.1
通讯作者：
Mu Y.
中科院分区：
文献类型：
--
作者：
Zhou G.-N.;Li W.-Q.;He C.-S.;Liu X.-C.;Ding R.-R.;Wang Y.-X.;Mu Y.
The performance and possible mechanisms of iodinated contrast medium diatrizoate (DTA) removal by sulfide-modified nano-sized zero-valent iron (S-nZVI) without the presence of oxygen were investigated in this study.结果表明，与 nZVI 相比，2 g L−1S-nZVI (S/Fe = 0.25) 显着提高了 30 μM DTA 的降解效率。动力学分析表明，S-nZVI去除DTA的三步脱碘过程可以通过准一级动力学模型进行适当拟合。 The first-step kinetic rate constant of DTA removal reached to 2.22 h−1with the utilization of S-nZVI, which was 5.2 times higher than that of nZVI. S-nZVI 去除 DTA 的增强机制被证实是通过抑制氢复合来积累更多的原子氢 (H*)。此外，发现当S/Fe比达到0.25时，DTA的降解速率最佳。随着S-nZVI用量的增加，DTA去除性能呈现出促进趋势，而腐殖酸或人工地下水环境的存在对S-nZVI对DTA的降解速率表现出抑制作用。 Additionally, the comparison of reduction capacity between S-nZVI and nZVI was evaluated in continuous flow systems, indicating that S-nZVI would likely present more practical application prospects on DTA removal than nZVI.
The performance and possible mechanisms of iodinated contrast medium diatrizoate (DTA) removal by sulfide-modified nano-sized zero-valent iron (S-nZVI) without the presence of oxygen were investigated in this study. It was shown that the degradation efficiency of 30 μM DTA was observably enhanced by 2 g L−1S-nZVI (S/Fe = 0.25) compared to nZVI. Kinetic analysis indicated that the three-step deiodination process of DTA removal by S-nZVI could be appropriately fitted by pseudo-first-order kinetic model. The first-step kinetic rate constant of DTA removal reached to 2.22 h−1with the utilization of S-nZVI, which was 5.2 times higher than that of nZVI. The enhancement mechanism for DTA removal by S-nZVI was confirmed as accumulating more atomic hydrogen (H*) via the inhibition of hydrogen recombination. Moreover, it was found that the degradation rate of DTA was optimal when the S/Fe ratio attained at 0.25. The DTA removal performance exhibited a promoting trend with the increasing of S-nZVI dosage, while the existence of humic acid or artificial groundwater environment showed an inhibition effect on the degradation rate of DTA by S-nZVI. Additionally, the comparison of reduction capacity between S-nZVI and nZVI was evaluated in continuous flow systems, indicating that S-nZVI would likely present more practical application prospects on DTA removal than nZVI.
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影响因子：
12.8
作者：
Xiao Xiao-Xiao;Guo-ping Sheng;Y. Mu;Hanqing Yu
通讯作者：
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影响因子：
11.4
作者：
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纳米零价铁有氧去除碘造影剂：氧化与还原的结合
影响因子：
13.6
作者：
Zhou G.-N.;He C.-S.;Wang Y.-X.;He P.-P.;Liu J.;Mu Y.;Zhang L.-S.
通讯作者：
Zhang L.-S.
影响因子：
11.4
作者：
Fan, Dimin;Johnson, Graham O'Brien;Johnson, Richard L.
通讯作者：
Johnson, Richard L.
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影响因子：
7.7
作者：
He Chuan Shu;Gong Li;Zhang Jie;He Pan Pan;Mu Yang
通讯作者：
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