Preparation of Ferrate and Oxidation of Nitrobenzene by It

Ferrate was prepared by electrolysis on the site in a diaphragm cell with double cathode chambers using flat grey cast iron as the anode. The electrolysis was maintained for 150 minutes and FeO42- of 27.1mmol/L was obtained, which was used to oxidize and degradate nitrobenzene-containing, simulated waste water. The result showed that when the pH was 7 and the mass ratio of ferrate to nitrobenzene was 15 approximately, the removal rates of nitrobenzene and CODCr were 98.3% and more than 92% respectively. The reaction between ferrate and nitrobenzene followed the first-order kinetic law.