ABSTRACT

In this study, we have applied Fe(III)-bi-carboxylic acid solutions containing citrate and oxalate ligands to degrade 3-méthylphénol (3MP) in aqueous solutions both under UV and sunlight. Under irradiation at 365 nm, the photodegradation of 3MP is markedly better in the presence of the Fe(III)Ox complex than in the Fe(III)Cit complex this fact is explained by an excess of H₂O₂ and Fe(II) generated by Fe(III)Ox photolysis creating the Fenton process. We mixtures were realized by varying the composition of the Fe(III)Cit and Fe(III)Ox in order to see the additives of the degradation efficiency of the pollutant. The results show that the addition of Fe(III)Ox to the Fe(III)Cit system evidently augmented the photodegradation rate at pH = 5.5. The Fe(III)Ox/Fe(III)Cit ratio is optimized at [Fe(III)Ox] (0.15/0.15)/[Fe(III)Cit] (0.15/0.6). Synergistic effect in the Fe(III)Ox/Fe(III)Cit binary system was confirmed. The addition of tertiobutanol (T-buOH) noticeably inhibited the photodegradation, indicating the involvement of ^•OH in the process. To verify the feasibility of photochemical processes in the environment, tests on the photodegradation of 3MP were performed under natural irradiation. The degradation was improved under excitation by sunlight in the presence of Fe(III)-bi-carboxylic acid solutions containing citrate and oxalate ligands. These results are very encouraging for the application of this system for the treatment of organic pollutants in aqueous solution.

摘要

在这项研究中，我们应用含有柠檬酸盐和草酸盐配体的 Fe(III)-二羧酸溶液在紫外线和阳光下降解水溶液中的 3-甲基苯酚 (3MP)。在 365 nm 的照射下，在 Fe(III)Ox 配合物存在下 3MP 的光降解明显好于在 Fe(III)Cit 配合物存在的情况下，这一事实可以通过过量的 H ₂ O _2来解释Fe(III)Ox 光解产生的 Fe(II) 产生芬顿过程。我们通过改变 Fe(III)Cit 和 Fe(III)Ox 的组成来实现混合，以观察污染物降解效率的添加剂。结果表明，在 Fe(III)Cit 体系中添加 Fe(III)Ox 明显提高了 pH = 5.5 时的光降解速率。Fe(III)Ox/Fe(III)Cit 比率优化为 [Fe(III)Ox] (0.15/0.15)/[Fe(III)Cit] (0.15/0.6)。Fe(III)Ox/Fe(III)Cit 二元体系中的协同效应得到证实。添加叔丁醇 (T-buOH) 显着抑制了光降解，表明^•过程中哦。为了验证环境中光化学过程的可行性，在自然辐照下对 3MP 的光降解进行了测试。在含有柠檬酸盐和草酸盐配体的 Fe(III)-二羧酸溶液的存在下，在阳光的激发下，降解得到了改善。这些结果对于该系统在水溶液中有机污染物处理中的应用是非常令人鼓舞的。