Green synthesis of iron oxide nanoparticles (Fe NPs) was prepared using Delonix regia flower extract, and their Photo Fenton like oxidation was performed. The synthesized Fe–NPs were characterized using XRD, FESEM, FETEM, FT-IR, and VSM confirmed the formation both of Magnetite (Fe₃O₄) and Hematite (α-Fe₂O₃) nanoparticles. The prepared catalyst was used for the photo Fenton like degradation of Methylene blue (MB) and Congo red (CR) dyes. The optimization of various operational parameters, such as the influence of concentration of catalyst, H₂O₂, initial dye and initial pH was executed. The results showed that under optimum conditions, about 99% decolorization of both MB and CR dye was accomplished within 10 min. The catalyst was removed by an external magnet, and reuse study showed that there is no notable decrease in the efficacy of the catalyst was observed up to five cycles. The results are exemplifying that the biogenic prepared Fe NPs having high potential for the photo-assisted degradation of both MB and CR in the existence of H₂O₂.

使用Delonix regia花提取物制备了氧化铁纳米颗粒（Fe NPs）的绿色合成，并进行了像Photo Fenton的氧化。使用XRD，FESEM，FETEM，FT-IR所合成的铁纳米粒进行了表征，并确认VSM既磁铁矿（Fe的形成₃ Ò ₄）和赤铁矿（α-的Fe ₂ ö ₃）的纳米颗粒。制备的催化剂用于亚甲基蓝（MB）和刚果红（CR）染料的光Fenton降解。优化各种操作参数，例如催化剂浓度，H ₂ O _2的影响，进行初始染料和初始pH。结果表明，在最佳条件下，MB和CR染料均在10分钟内完成了约99％的脱色。用外部磁铁除去了催化剂，再利用研究表明，直到五个循环，催化剂的功效都没有明显降低。结果表明，在H ₂ O ₂存在下，生物制备的Fe NPs具有很高的光降解MB和CR的潜力。