Degradation of bisphenol A in aqueous solution by persulfate activated with ferrous ion
2013
Jiang, Xiaoxuan | Wu, Yanlin | Wang, Peng | Li, Hongjing | Dong, Wenbo
Degradation of bisphenol A (BPA) in aqueous solution was studied with high-efficiency sulfate radical (SO₄⁻·), which was generated by the activation of persulfate (S₂O₈²⁻) with ferrous ion (Fe²⁺). S₂O₈²⁻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 S₂O₈²⁻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 Fe⁰was 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–S₂O₈²⁻system, Fe⁰as the activator of S₂O₈²⁻could offer sustainable oxidation for BPA, and higher TOC removal rate was achieved. It was proved that Fe⁰–S₂O₈²⁻system has perspective for future works.
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