| dc.description.abstract | Artificial food colorants are chemically synthesized pigments that exhibit varying impacts on different types of soil. They are readily absorbed by acidic soils due to their large molecular size and ionic bonds. Consequently, soil composition also influences their adsorption levels. Literature has indicated the harmful effects of artificial food colorants on human health, including decreased fertility, malformed fetuses, and a potential carcinogenic impact. Previous studies have demonstrated the capability of natural iron oxide minerals in soil to catalyze Fenton-like oxidation, effectively treating various dissolved and non-dissolved pollutants. Hence, this research employs goethite to simulate natural iron oxide minerals in catalyzing peroxide to conduct Fenton-like reactions for removing pollutants such as artificial food colorants. By adjusting different parameters such as pH levels, goethite content, H2O2 concentration, and frequency of addition, this study focuses on using FD&C Blue No. 1 food colorant to explore the variations in its removal characteristics through this system.
Based on the results obtained, it was observed that increasing the concentration of H2O2 did not significantly enhance the ability of goethite to catalyze the Fenton-like reaction. However, increasing the frequency of H2O2 addition tended to mitigate the competitive interactions among Fe2+, Fe3+, and HO‧, thus maintaining a certain concentration of H2O2. This, in turn, proved to be highly effective in enhancing the capability of the Fenton-like reaction. Moreover, concerning different pH values, under acidic conditions, goethite demonstrated the ability to dissociate more iron ions, react with H2O2, and generate more HO‧. Therefore, it was notably evident that at pH=3, there was a substantial increase in the ability to catalyze the Fenton-like reaction. Regarding the quantity of goethite, higher content led to the release of a greater amount of iron ions available for reaction and provided more surface area for goethite-H2O2 interactions, both significantly enhancing the capability of the Fenton-like reaction. Hence, when utilizing synthetic goethite for catalyzing the Fenton-like reaction in removing artificial food colorant pollutants, referencing the parameter settings in this study can effectively evaluate and predict the feasibility and efficiency of eliminating pollutants associated with artificial food colorants. | en_US |