Electrochemical removal of bromate from drinking water

Abstract

The electrochemical removal of bromate on a tin cathode has been studied by both electrochemical techniques, such as cyclic voltammetry and chronoamperometry, as well as by steady-state electrolytic experiments. The reduction of bromate in 2M NaCl takes place efficiently at potentials more negative than -1.4V vs. Ag/AgCl and the rate of the reduction displays a maximum at about -1.8 V, then decreases and consequently it increases again as the potential becomes more negative than -1.9 V. The % removal efficiency of bromate displays a maximum (75.6%) at -1.8 V, while the % selectivity of bromide displays a minimum (70.3%) at the same potential.