Modelling of iohexol degradation in a Fe(II)-activated persulfate system
Modelling of iohexol degradation in a Fe(II)-activated persulfate system
复制标题
Fe(II) 激活的过硫酸盐系统中碘海醇降解的模拟
DOI：
10.1016/j.cej.2019.02.120
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发表时间：
2019-07
影响因子：
15.1
通讯作者：
Gao Naiyun
中科院分区：
文献类型：
--
作者：
Zhu Jingping;Lin Yili;Zhang Tianyang;Cao Tongcheng;Xu Bin;Pan Yang;Zhang Xitong;Gao Naiyun
由于碘海醇的非生物降解性和亲水性，在常规污水处理工艺中很难去除。在这项研究中，建立了一个动力学模型来描述碘海醇在铁激活过硫酸盐体系中的降解。所建立的模型能很好地预测不同水基质条件下，不同初始浓度的碘海醇和氧化剂(亚铁和过硫酸盐)对硫酸盐自由基的降解和演化。计算得到碘海醇与硫酸根的反应速率常数为(1.83 ± 0.10) × 109M−1S−1。实验数据和模型结果都表明，低浓度的氯离子促进碘海醇的降解，高浓度的氯离子抑制碘海醇的降解，NOM对碘海醇的降解略有抑制。此外，通过自由基猝灭实验确定了体系中形成的主要自由基，进一步验证了模型的准确性。该模型还能够预测阿特拉津的降解，实验数据与预测结果的相关系数在0.97以上，表明所建立的模型对其他难降解污染物在Fe2+/PS体系中的降解也是适用的。
Iohexol can hardly be removed in conventional wastewater treatment processes due to its non-biodegradable and hydrophilic characteristics. In this study, a kinetic model was established to describe iohexol degradation in Fe (II)-activated persulfate system. The developed model can well predict iohexol degradation and evolution of sulfate radical with various initial iohexol and oxidant (ferrous iron and persulfate) concentrations under various water matrix. The rate constant of iohexol reacting with sulfate radical was calculated as (1.83 ± 0.10) × 109M−1s−1. The effects of the two most common components in natural water bodies, chloride ion and natural organic matter (NOM) on iohexol degradation, were also studied. Both experimental data and model results showed that the low concentration of chloride ion promoted iohexol degradation while high concentration inhibited it, and NOM slightly inhibited iohexol degradation. Besides, radical quenching tests were employed to identify the main radicals formed in the system and further verified the model accuracy. The model is also capable of predicting the atrazine degradation with the correlation coefficients between the experimental data and predicted results above 0.97, suggesting the applicability of the established model for some other recalcitrant contaminant degradation in the Fe2+/PS system.
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影响因子：
11.4
作者：
V. Pereira;H. Weinberg;K. Linden;P. Singer
通讯作者：
V. Pereira;H. Weinberg;K. Linden;P. Singer
DOI：
10.1016/s0378-4347(98)00525-8
发表时间：
1999-02
期刊：
Journal of chromatography. B, Biomedical sciences and applications
影响因子：
--
作者：
E. Behrman;D. Dean
通讯作者：
E. Behrman;D. Dean
影响因子：
8.2
作者：
Chevre, Nathalie
通讯作者：
Chevre, Nathalie
影响因子：
13.6
作者：
Rao, Y. F.;Qu, Liang;Chu, W.
通讯作者：
Chu, W.
影响因子：
12.8
作者：
Luo, Congwei;Jiang, Jin;Wu, Daoji
通讯作者：
Wu, Daoji