Abstract
Degradation of bisphenol A (BPA) in aqueous solution was studied with high-efficiency sulfate radical (SO4 −·), which was generated by the activation of persulfate (S2O8 2−) with ferrous ion (Fe2+). S2O8 2− was activated by Fe2+ to produce SO4 −·, and iron powder (Fe0) was used as a slow-releasing source of dissolved Fe2+. The major oxidation products of BPA were determined by liquid chromatography-mass spectrometer. The mineralization efficiency of BPA was monitored by total organic carbon (TOC) analyzer. BPA removal efficiency was improved by the increase of initial S2O8 2− or Fe2+ concentrations and then decreased with excess Fe2+ concentration. The adding mode of Fe2+ had significant impact on BPA degradation and mineralization. BPA removal rates increased from 49 to 97 % with sequential addition of Fe2+, while complete degradation was observed with continuous diffusion of Fe2+, and the latter achieved higher TOC removal rate. When Fe0 was employed as a slow-releasing source of dissolved Fe2+, 100 % of BPA degradation efficiency was achieved, and the highest removal rate of TOC (85 %) was obtained within 2 h. In the Fe0–S2O8 2− system, Fe0 as the activator of S2O8 2− could offer sustainable oxidation for BPA, and higher TOC removal rate was achieved. It was proved that Fe0–S2O8 2− system has perspective for future works.
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This work was financially supported by National Natural Science Fund (no. 21077027) and Shanghai Natural Science Fund (no. 12ZR1402000).
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Jiang, X., Wu, Y., Wang, P. et al. Degradation of bisphenol A in aqueous solution by persulfate activated with ferrous ion. Environ Sci Pollut Res 20, 4947–4953 (2013). https://doi.org/10.1007/s11356-013-1468-5
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DOI: https://doi.org/10.1007/s11356-013-1468-5