Comparative study of oxidative degradation of sodium diatrizoate in aqueous solution by H2O2/Fe2+, H2O2/Fe3+, Fe (VI) and UV, H2O2/UV, K2S2O8/UV
Comparative study of oxidative degradation of sodium diatrizoate in aqueous solution by H2O2/Fe2+, H2O2/Fe3+, Fe (VI) and UV, H2O2/UV, K2S2O8/UV
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DOI：
10.1016/j.cej.2013.10.036
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发表时间：
2014-04
影响因子：
15.1
通讯作者：
I. Velo-Gala;J. López-Peñalver;M. Sánchez-Polo;J. Rivera-Utrilla
中科院分区：
文献类型：
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作者：
I. Velo-Gala;J. López-Peñalver;M. Sánchez-Polo;J. Rivera-Utrilla
这项研究的重点是基于使用铁盐和紫外线 (UV) 辐射去除泛影酸盐 (DTZ) 造影剂的高级氧化过程 (AOP)，该造影剂被选为能够抵抗所有传统自然和废水处理方法的模型化合物。我们研究了芬顿试剂、铁 (III) 和铁 (VI) 盐以及基于使用紫外线辐射、UV/H2O2 和 UV/K2S2O8 的氧化过程对水介质中 DTZ 降解的有效性。使用芬顿试剂，DTZ 去除百分比与初始 Fe2+ 浓度无关，并且受初始过氧化氢浓度的影响最大。相反，类芬顿系统受到初始 Fe3+ 和 H2O2 浓度的影响。高铁酸盐盐基方法的效果高度依赖于溶液 pH 值，当介质中二氢高铁酸盐物质占主导地位时，可以获得更高的速率常数 (1.74 × 102M−1s−1)。 UV/H2O2 系统强烈依赖于 pH 值和初始 H2O2 浓度，在 H2O2 浓度 <10.0 mM 时表现出良好的协同效应。事实证明，UV/K2S2O8 系统比 UV/H2O2 系统更有效，具有更高的速率常数，当 pH = 6.5 和 [DTZ]0= 25 mg L−1 时，速率常数高出 24.0%。对基质对这些 AOP 的影响的研究表明，与基于铁盐的系统相比，基于紫外线辐射的系统在地表水中的 DTZ 去除百分比和反应速率明显更高。根据获得的总有机碳值，只有使用 UV/K2S2O8 系统才能实现高度矿化。
This study centers on Advanced Oxidation Processes (AOPs) based on the use of iron salts and ultraviolet (UV) radiation for the removal of diatrizoate (DTZ) contrast medium, selected as a model compound resistant to all conventional natural and waste water treatment methods. We studied the effectiveness of Fenton’s reagent, Iron (III) and Iron (VI) salts, and oxidation processes based on the use of UV radiation, UV/H2O2and UV/K2S2O8, for the degradation of DTZ in aqueous medium. With Fenton’s reagent, the percentage DTZ removal was independent of the initial Fe2+concentration and was most influenced by the initial hydrogen peroxide concentration. In contrast, the Fenton-likesystem was affected by both initial Fe3+and H2O2concentration. The effects of ferrate salt-bases methods were highly dependent on the solution pH, and a higher rate constant (1.74 × 102M−1s−1) was obtained when dihydrogen ferrate species predominated in the medium. The UV/H2O2system was strongly dependent on the pH and initial H2O2concentration, showing a favorable synergic effect at H2O2concentrations <10.0 mM. The UV/K2S2O8system proved to be more effective than the UV/H2O2system, with higher rate constants, which were 24.0% higher for pH = 6.5 and [DTZ]0= 25 mg L−1. Study of the influence of the matrix on these AOPs revealed a markedly higher percentage DTZ removal and reaction rate in surface water with the UV radiation-based systems than with the iron salt-based systems. According to the total organic carbon values obtained, a high degree of mineralization was only attained with the UV/K2S2O8system.