Evaluation of Potential Degradation of Bisphenol A by Zero-Valent Iron (ZVI)

Abstract

This study examined the potential degradation of bisphenol-A (BPA) in water by zero-valent iron (ZVI). Experimentation showed BPA in water degraded when contacted with ZVI and displayed a first-order degradation rate constant of 0.0072 hr −1 and half-life of 96.3 hours with an initial concentration of 2 ppm. Analysis showed absence of BPA from ZVI surface suggesting that as it contacted the iron surface, it degraded; further suggesting ZVI may treat BPA at high concentrations. These results paralleled others examining ZVI treatment of other contaminants. Therefore, ZVI may be optimized to treat water contaminated with BPA at natural conditions.

Fate of Bisphenol A in Terrestrial and Aquatic Environments

“…ZVI is reactive toward a variety of organic compounds . The ZVI-mediated production of hydroxyl radicals was implicated in BPA degradation, but no transformation products were reported . Similarly, degradation of aqueous phase BPA using nanosized ZVI in the presence of hydrogen peroxide and persulfate oxidants has been demonstrated …”

pH-dependent degradation of acid orange II by zero-valent iron in presence of oxygen

“…Recently, there has been a growing interest in ZVI-mediated advanced oxidation processes (AOPs) using small-sized ZVI particles to oxidize pesticides, aromatic compounds and chelating agents in the presence of oxygen [11][12][13][14][15]. So far, the proposed mechanisms of the ZVI-mediated advanced oxidation (ZVI/O 2 ) process have been classified into two different pathways.…”

Removal of bisphenol A by iron nanoparticle-doped magnetic ordered mesoporous carbon

“…[13][14][15] It has been conrmed to be highly effective in the removal of numerous pollutants, including PCBs, 16 bromides, 17 dyes, 18 heavy metals 19 and BPA. 20,21 In Yunfei Xi's work, 21 the degradation of bisphenol A was a Fenton reaction where zero-valent iron was oxidized into ferrous ions by oxygen to produce hydrogen peroxide, then the hydrogen peroxide and bivalent iron oxidized BPA into inorganic state. Immobilizing the nano zero-valent iron on the ordered mesoporous carbon can effectively increase the contact area with pollutants, and prevent the agglomeration and further oxidation of nano zerovalent iron.…”