高铁酸钾氧化降解水中双酚A的研究

Potassium ferrate oxidation of aqueous bisphenol A

为了对实际应用提供理论指导,通过烧杯试验研究了高铁酸钾(K_2FeO_4)对水中内分泌干扰物双酚A(BPA)的氧化降解效能,探讨了水中本底物质对K_2FeO_4氧化降解BPA的影响。结果表明,水中BPA易被K_2FeO_4氧化降解,适宜的氧化时间为30min,适宜的pH值为5.0～6.0;当原水BPA质量浓度为2mg/L,K_2FeO_4/BPA物质的量比为3时,BPA基本完全降解;低BPA初始浓度下,K_2FeO_4降解BPA的效能下降;水中本底物质天然有机物、SiO_3^(2-)和自由基抑制剂叔丁醇的存在一定程度上抑制K_2FeO_4对BPA的氧化降解,而HCO_3^-的存在一定程度上促进K_2FeO_4对BPA的降解。

There has been increasing concern about the widespread occurrence of endocrine disrupting chemicals （EDCs） in the water environment, for example, bisphenol A （BPA）, a typical EDC, which is widely used in industries. Currently, the degradation of ED- Cs such as BPA by advanced oxidation process has become a research focus. Potassium ferrate （K2FeO4）, an efficient, non-toxic and mul- tipurpose water treatment agent, has the effect of oxidation, disinfection, adsorption and coagulation etc. In this paper, the excellent oxidation potential of K2FeO4 was used to degrade aqueous BPA employing jar tests. The purpose is to provide theoretical basis for the application of BPA degradation by K2FeO4. The BPA degradation efficiency under different conditions was investigated. The influences of tertbutyl alcohol （ a free-radical inhibitor） and background constituents in natural water, such as humic acid （a natural organic matter）, SiO3^2-, and HCO3^-, were analyzed. The results showed that BPA was readily degraded by K2FeO4 oxidation and the suitable oxidation time was 30 min. The pH significantly influenced the stability and oxidability of K2FeO4, and the optimal pH for BPA degradation was 5.0 - 6.0. The BPA degradation rate increased with increasing K2FeO4, dosage and decreasing initial BPA concentration. With an initial BPA concentration of 2 mg/L and a K2FeO4/BPA molar ratio of 3, BPA was almost completely removed. The background constituents in natural water showed different influences on BPA degradation. The existence of humic acid, SiO3^2- and tert-butyl alcohol in water decreased the BPA degradation rate, while the existence of HCO3^- improved the BPA degradation. The natural organic matter of 12 mg/L decreased the BPA degradation rate by 16%. The HCO3^- concentration of 50 mg/L increased the BPA degradation rate by 5 % . Both SiO3^2- and tert-butyl alcohol slightly inhibited the BPA degradation.