Oxidation performance and mechanism of bisphenol A over supported nascent MnO2
Mineral supported nascent MnO2(S-MnO2)with porous structure was prepared via reducing KMnO4 by plant poly-phenol(e.g.,tannic acid)anchored on the surface of airstone.The oxidation performance and mechanism of endocrine disruptors(such as bisphenol A,BPA)over S-MnO2 was investigated,and stability of S-MnO2 in complicated water matrix was studied.Due to the porous net-work like structure,the recoverable S-MnO2 exhibited good performance toward the oxidation of BPA.When the dosage of S-MnO2 was 4.0g(containing 7.08μmol MnO2),94％of BPA was removed in 60min,which was 4.5 times higher than that over the same amount of powdery nascent MnO2.Mechanism studies revealed that Mn(Ⅲ)and Mn(Ⅳ)were both participated into the oxidation of BPA,and Mn(Ⅲ)was essential to the rapid removal of BPA.The removal of BPA was mainly ascribed to the single electron transfer reaction,which enabled good resistance to complex surroundings like anions,cations and natural organic matters.S-MnO2 was relative stable for BPA removal in consecutive runs and could be facile regenerated via the oxidation by KMnO4,revealing a promising potential for further application.
supported nascent MnO2network-like structureMn(Ⅲ)bisphenol A
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