Oxidative Removal of Bisphenol A by Manganese Dioxide: Efficacy, Products, and Pathways

作者：Lin Kunde^*; Liu Weiping; Gan Jay

来源：Environmental Science & Technology, 2009, 43(10): 3860-3864.

DOI：10.1021/es900235f

Bisphenol A (BPA) is a ubiquitous environmental contaminant with endocrine disruption potential. In this study, exploiting the outstanding oxidative capacity of manganese dioxide (delta-MnO(2)), we explored for the first time the efficacy and mechanisms of BPA removal by MnO(2). In aqueous solutions, MnO(2) demonstrated an extremely efficient capacity to remove BPA. Nearly all BPA (>99%) was eliminated in 6 min in a pH 4.5 solution initially containing 800 mu M MnO(2) and 4.4 mu M BPA. While humic acid showed negligible inhibition on BPA removal, coexisting metal ions such as Mn(2+), Ca(2+), Mg(2+), and Fe(3+) displayed suppressive effects and the inhibitive capacity followed the order Mn(2+) > Ca(2+) > Mg(2+) approximate to Fe(3+). A total of 11 products or intermediates were indentified and a detailed reaction scheme was suggested. The products could be ascribed to a suite of reactions of radical coupling, fragmentation,substitution, and elimination, triggered by the BPA radical formed through electron transfers to MnO(2). The exceptional efficiency of MnO(2) in removing BPA represents a potential use of MnO(2) to treat waters containing phenolic compounds and also suggests a potentially important role of oxide-facilitated abiotic transformations in BPA attenuation in natural soil and sediment environments.

• 出版日期2009-5-15
• 单位浙江工业大学