“…The most investigated application of green FeONPs is in the removal of pollutants from contaminated sites. Dye and textile industries are the major sources of water contamination due to improper waste disposal containing recalcitrant and polluting organic dyes, which inhibits photosynthesis, presents high toxicity to aquatic and human lives, and creates aesthetic problems. , The highly complex and stable organic dyes are resistant to biodegradation, where treatment with iron compounds plays a central role in remediation processes. − Therefore, green FeONPs have been widely used in organic pollutant removal by heterogeneous Fenton-like degradation, presenting promising results. − ,,, For instance, FeONPs prepared with black tea, Yerba Mate, , and green tea extracts removed the dye methyl orange completely. In addition to the aforementioned advantages of the green FeONPs, TP can help to restore Fe 2+ by reduction of Fe 3+ ions (eqs S1–S4), can increase the stability of Fe 2+ by chelation, and can prevent iron sludge formation as well as increase the production of OH • radicals due to the lowering of the reaction pH by the release of acidic hydrogen to the medium, thus improving the overall Fenton efficiency …”