Degradation of some micro-pollutants from aqueous solutions using ferrate (VI): Physico-chemical studies

Abstract

ABSTRACTThe aim of this communication is to investigate various physico-chemical parametric studies in the oxidative degradation of bisphenol A (BPA) and diclofenac (DCF) in aqueous solutions using the ferrate (VI). A wide range of pH (7.0–12.0) and concentrations of BPA/or DCF (0.03–0.5 mmol/L) is studied at a constant concentration of ferrate (VI) 0.1 mmol/L. Apparent rate constant was found to be 8.35 × 102 and 7.62 × 102 L/mol/min, respectively, for BPA and DCF degradation by the ferrate (VI). Further, decreasing the pH from 12.0 to 7.0, the corresponding increase is percentage degradation of BPA and DCF is found to be from 23 to 87% for BPA and from 14 to 41% for DCF, respectively, at the ferrate (VI) to micro-pollutant molar ratio 1:1. Total organic carbon data showed that partial mineralization of BPA/or DCF is achieved at a single operation of ferrate (VI) treatment. Moreover, decreasing the micro-pollutant concentration from 0.5 to 0.03 mmol/L has caused to increase the percentage TOC removal from 15 to 45% (for BPA) and from 10 to 38% (for DCF), respectively, at pH 7.0. The presence of NaCl, NaNO3, and Na2HPO4 electrolytes could not affect significantly the oxidation of BPA and DCF by ferrate (VI). However, the presence of NaNO2 and Na2SO3 co-existing ions hampered significantly the degradation of BPA and DCF using ferrate (VI).