Laboratoire des sciences et technologies de l'environnement, faculté des sciences exacte, Département de chimie, université Frères Montouri Constantine 1, Constantine, Algérie.
Environ Technol. 2022 Jul;43(17):2612-2619. doi: 10.1080/09593330.2021.1891142. Epub 2021 Mar 2.
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 HO 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.
在这项研究中，我们应用了含有柠檬酸和草酸盐配体的 Fe(III)-双羧酸溶液，在紫外光和阳光照射下降解水溶液中的 3-甲基苯酚（3MP）。在 365nm 照射下，Fe(III)Ox 配合物存在下 3MP 的光降解明显优于 Fe(III)Cit 配合物，这一事实可以通过 Fe(III)Ox 光解产生的 HO 和 Fe(II)过剩来解释，从而形成芬顿过程。我们通过改变 Fe(III)Cit 和 Fe(III)Ox 的组成来实现混合物，以观察添加剂对污染物降解效率的影响。结果表明，在 pH=5.5 时，将 Fe(III)Ox 添加到 Fe(III)Cit 体系中，明显提高了光降解速率。Fe(III)Ox/Fe(III)Cit 的比值在 [Fe(III)Ox]（0.15/0.15）/[Fe(III)Cit]（0.15/0.6）时达到最佳。在 Fe(III)Ox/Fe(III)Cit 二元体系中证实了协同效应。添加叔丁醇（T-buOH）明显抑制了光降解，表明 OH 在该过程中起作用。为了验证光化学过程在环境中的可行性，在自然光照射下进行了 3MP 的光降解试验。在含有柠檬酸和草酸盐配体的 Fe(III)-双羧酸溶液存在下，阳光激发时降解得到改善。这些结果非常令人鼓舞，为该体系在水溶液中处理有机污染物的应用提供了依据。
