Experimental studies were conducted to investigate the degradation of bisphenol A (BPA) by using persulfate (PS) as the oxidant and Fe₃O₄@β-cyclodextrin (β-CD) nanocomposite as a heterogeneous activator. The catalytic activity was evaluated in consideration of the effect of various parameters, such as pH value, PS concentration and Fe₃O₄@β-CD load. The results showed that 100% removal of BPA was gained at pH 3.0 with 5 mM PS, 1.0 g L⁻¹ Fe₃O₄@β-CD, and 0.1 mM BPA in 120 min. Further, the catalytic activity of Fe₃O₄@β-CD nanocomposite was observed as much higher when compared with Fe₃O₄ nanoparticles alone. The sulfate and hydroxyl radicals referred to in the Fe₃O₄@β-CD/PS system were determined as the reactive species responsible for the degradation of BPA by radical quenching and electron spin resonance (ESR) tests. In addition, the catalyst also possessed with accepted reusability and stability. On the basis of the results of the effect of chloride ions (Cl⁻), β-CD was found to play a crucial role in reducing interference from Cl⁻ ions, and lead to achieve higher removal efficiency for BPA in Fe₃O₄@β-CD/PS system. A possible mechanistic process of BPA degradation was proposed according to the identified intermediates by gas chromatography-mass spectroscopy (GC-MS).

中文翻译：

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Fe3O4@β-环糊精纳米复合材料高效活化过硫酸盐去除双酚A†

_{通过使用过硫酸盐（PS）作为氧化剂和Fe 3} O ₄ @β-环糊精（β-CD）纳米复合材料作为非均相活化剂，进行了实验研究以研究双酚A（BPA）的降解。考虑到各种参数的影响，例如 pH 值、PS 浓度和 Fe ₃ O ₄ @β-CD 负载量，对催化活性进行了评价。结果表明，在 pH 3.0 下，使用 5 mM PS、1.0 g L ^-1 Fe ₃ O ₄ @β-CD 和 0.1 mM BPA 在 120 分钟内可 100% 去除 BPA。_{此外，与 Fe 3}相比，观察到Fe ₃ O ₄ @β-CD 纳米复合材料的催化活性要高得多。单独的O _{4纳米颗粒。通过自由基猝灭和电子自旋共振 (ESR) 测试，将 Fe 3} O ₄ @β-CD/PS 系统中提到的硫酸根和羟基自由基确定为负责降解 BPA 的活性物质。此外，该催化剂还具有公认的可重复使用性和稳定性。基于氯离子（Cl ^{- ）影响的结果，发现β-CD在减少Cl -}离子的干扰方面起着至关重要的作用，并导致对Fe ₃ O ₄中BPA的去除效率更高@β-CD/PS 系统。根据气相色谱-质谱 (GC-MS) 鉴定的中间体，提出了可能的 BPA 降解机理过程。