Removal of bisphenol A by pyrrole nitrogen doped reduced graphene oxide foam for peroxodisulfate activation
The nitrogen doped reduced graphene oxide foam(N-RGF)with excellent recyclability was prepared by hydrothermal method followed freeze drying treatment using pyrrole as nitrogen source,and was applied to activate peroxodisulfate(PDS)to remove bisphenol A(BPA).The structures of as-prepared samples were investigated by SEM,XRD,XPS,FT-IR,BET and TG techniques.The effects of dissolved organic matter(DOM)and inorganic ions on the removal of BPA by N-RGF were explored.The results showed that the N-RGF prepared using pyrrole as nitrogen source has a 3-dimensional foam structure with relatively uniform pores(2～3.5 μm),large specific surface area(90.029 m2/g)and pore volume(0.541 7 cm3/g),high graphitic nitrogen content(4.3％).Moreover,N-RGF has strong elasticity,which is beneficial for the stability and recyclability.The degradation kinetic rate constant of BPA over N-RGF(0.008 35 min-1)was 5.88 times than that of RGF(0.001 42 min-1).The DOM and inorganic ions showed little inhibiting effect on the catalytic performance of N-RGF.The reactive species capture experiment and electron paramagnetic resonance(EPR)showed that singlet oxygen(1O2)is the main active species for BPA degradation.Ten intermediates were identified by solid phase extraction combined with ultra-high-performance liquid chromatography-mass spectrometry(SPE-UHPLC-MS),and possible degradation pathways were proposed.Moreover,the estrogenic activity of treated solution was excluded by the MCF-7 estrogen activity test.
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