This study investigated the ibuprofen (IBP) degradation by persulfate (PS) activated with Fe(III) and gallic acid (GA) in the soil system. This study aimed to find an environmentally friendly method for the purification of soil organic pollutants. Results showed that the addition of GA could greatly improve the IBP oxidation efficiency due to the GA reduction effect of Fe(III) to Fe(II). The optimum dosage of each reagent was obtained with Fe(III):GA:PS = 1:1:10 to achieve 80.7% deterioration of IBP in 2 h when the initial IBP concentration was 48.4 μmol kg⁻¹. Quenching experiments suggested that hydroxyl radical (HO), sulfate radical (SO₄⁻), and superoxide anion radicals (O₂⁻) played important roles in the oxidation of IBP, and the contribution ratios were 28.5%, 25.5% and 44.4% respectively. The reaction started from the complexing between Fe(III) and GA. The Fe(III)-GA complex was transferred to quinone substance and Fe(II). PS was efficiently activated by Fe(II), and radicals were produced. The second order rate constants of the reactions between HO/SO₄⁻and GA/IBP were determined with laser flash photolysis experiments (k_{HO, GA} = 2.80 × 10¹⁰ M⁻¹ s⁻¹, k_{SO4−, GA} = 2.01 × 10⁹ M⁻¹ s⁻¹, and k_HO,IBP = 3.11 × 10⁹ M⁻¹ s⁻¹, k_SO4−,IBP = 1.97 × 10⁹ M⁻¹ s⁻¹). The soil organic matter (SOM) slightly decreased by 4.46%, and pH was changed from 7.8 to 6.2 after 240 min of reaction. The introduction of GA significantly increased the dissolved organic carbon (DOC), while the oxidation of the Fe(III)/GA/PS system decreased by 5.85% of the DOC content. Four chief byproducts were identified with GC–MS, and a potential degradation mechanism of IBP was proposed.

本研究调查了土壤系统中用 Fe(III) 和没食子酸 (GA) 活化的过硫酸盐 (PS) 对布洛芬 (IBP) 的降解。本研究旨在寻找一种环境友好的土壤有机污染物净化方法。结果表明，由于 Fe(III) 对 Fe(II) 的 GA 还原作用，GA 的添加可以大大提高 IBP 氧化效率。当初始 IBP 浓度为 48.4 μmol kg ^-1时，每种试剂的最佳用量为 Fe(III):GA:PS = 1:1:10，以在 2 小时内使 IBP 恶化 80.7% 。淬灭实验表明，羟基自由基（HO ）、硫酸根自由基（SO ₄ ^-）和超氧阴离子自由基（O ₂ ^-)在IBP的氧化中起重要作用，贡献率分别为28.5%、25.5%和44.4%。反应开始于 Fe(III) 和 GA 之间的络合。Fe(III)-GA 复合物被转移到醌类物质和 Fe(II)。PS被Fe(II)有效活化，产生自由基。HO之间的反应的二阶速率常数/ SO ₄ ^-和GA / IBP用激光闪光光解实验（确定ķ _{HO ，GA}  = 2.80×10 ¹⁰ 中号^-1 小号^-1，ķ _{SO4 - ，GA}  = 2.01× 10 ⁹  M ^-1  s ^-1，和k _{HO ,IBP}  = 3.11 × 10 ⁹  M ^-1  s ^-1 , k _{SO4 -,IBP}  = 1.97 × 10 ⁹  M ^-1  s ^-1 )。反应 240 分钟后，土壤有机质 (SOM) 略微下降 4.46%，pH 从 7.8 变为 6.2。GA的引入显着增加了溶解有机碳（DOC），而Fe(III)/GA/PS体系的氧化降低了DOC含量的5.85%。GC-MS 鉴定了四种主要副产物，并提出了 IBP 的潜在降解机制。