Xu Zhimin, Ju Shaohua, Gao Peng, Lin Junjian, Niu Yifan, Meng Fei, Li Shunling, Li Fangfang, Du Jiahao, Xu Li, Peng Hongbo, Pan Bo
Faculty of Modern Agricultural Engineering, Kunming University of Science & Technology, Kunming, 650500, Yunnan, China.
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, Yunnan, China.
Environ Sci Pollut Res Int. 2023 May;30(24):66303-66313. doi: 10.1007/s11356-023-27141-8. Epub 2023 Apr 25.
In this study, ferrous composites (FeO) were prepared by microreactor to activate peroxydisulfate (PDS) for the degradation of bisphenol A (BPA) with visible (Vis) light irradiation. X-ray diffraction (XRD), energy-dispersive spectrometry (EDS), X-ray photoelectron spectroscopy (XPS), and scanning electron microscope (SEM) were used to characterize the morphology and crystal phase of FeO. Photoluminescence (PL) spectroscopy combined with amperometric tests were used to determine the role of PDS on the performance of photocatalytic reaction. The main reactive species and intermediates for BPA removal were determined by electron paramagnetic resonance (EPR) measurement and quenching experiments. The result indicated that singlet state oxygen (O) contributed more to the BPA degradation than that of other reactive radicals (·OH, SO and ·O); these reactive radicals and O formed by the reaction between photo-generated electrons (e) and holes (h) of FeO and PDS. During this process, the consumption of e and h also improved their separation efficiency and thus enhanced the degradation of BPA. In addition, the photocatalytic activity of FeO in Vis/FeO/PDS system was 3.2-fold and 6.6-fold higher than that of single FeO and PDS under Vis light, respectively. The Fe/Fe cycle could effectively drive the photocatalytic activation of PDS through indirect electron transfer and the formation of reactive radicals. This work illustrated that the degradation of BPA was rapidly in Vis/FeO/PDS system mainly through O, which further improve our understanding on the efficient removal of organic contaminants in the environment.
在本研究中，通过微反应器制备了亚铁复合材料（FeO），以在可见光（Vis）照射下活化过二硫酸盐（PDS）来降解双酚A（BPA）。采用X射线衍射（XRD）、能谱分析（EDS）、X射线光电子能谱（XPS）和扫描电子显微镜（SEM）对FeO的形貌和晶相进行表征。利用光致发光（PL）光谱结合安培测试来确定PDS在光催化反应性能中的作用。通过电子顺磁共振（EPR）测量和猝灭实验确定了去除BPA的主要活性物种和中间体。结果表明，单线态氧（O）对BPA降解的贡献比其他活性自由基（·OH、SO和·O）更大；这些活性自由基和O是由FeO和PDS的光生电子（e）与空穴（h）反应形成的。在此过程中，e和h的消耗也提高了它们的分离效率，从而增强了BPA的降解。此外，在可见光下，Vis/FeO/PDS体系中FeO的光催化活性分别比单一FeO和PDS高3.2倍和6.6倍。Fe/Fe循环可以通过间接电子转移和活性自由基的形成有效地驱动PDS的光催化活化。这项工作表明，在Vis/FeO/PDS体系中，BPA主要通过O快速降解，这进一步增进了我们对环境中有机污染物高效去除的理解。
