Zhu Yanyan, Yue Min, Natarajan Vinothkumar, Kong Lingshuai, Ma Long, Zhang Yuqiang, Zhao Quanqin, Zhan Jinhua
Key Laboratory for Colloid & Interface Chemistry of Education Ministry, Department of Chemistry, Shandong University Jinan 250100 P. R. China
School of Environmental Science and Engineering, Shandong University Jinan 250100 P. R. China.
RSC Adv. 2018 Apr 19;8(27):14879-14887. doi: 10.1039/c8ra01696h. eCollection 2018 Apr 18.
Experimental studies were conducted to investigate the degradation of bisphenol A (BPA) by using persulfate (PS) as the oxidant and FeO@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 FeO@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 FeO@β-CD, and 0.1 mM BPA in 120 min. Further, the catalytic activity of FeO@β-CD nanocomposite was observed as much higher when compared with FeO nanoparticles alone. The sulfate and hydroxyl radicals referred to in the FeO@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 FeO@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).
开展了实验研究，以过硫酸盐（PS）作为氧化剂、FeO@β-环糊精（β-CD）纳米复合材料作为非均相活化剂来研究双酚A（BPA）的降解情况。考虑到各种参数的影响，如pH值、PS浓度和FeO@β-CD负载量，对催化活性进行了评估。结果表明，在pH 3.0、5 mM PS、1.0 g/L FeO@β-CD和0.1 mM BPA的条件下，120分钟内BPA的去除率达到100%。此外，与单独的FeO纳米颗粒相比，FeO@β-CD纳米复合材料的催化活性要高得多。通过自由基猝灭和电子自旋共振（ESR）测试确定，FeO@β-CD/PS体系中的硫酸根和羟基自由基是导致BPA降解的活性物种。此外，该催化剂还具有可接受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关键作用，并使得FeO@β-CD/PS体系中BPA的去除效率更高。根据气相色谱-质谱联用仪（GC-MS）鉴定出的中间体，提出了BPA降解的可能机理过程。
