Electrode for selective bromide removal in membrane capacitive deionisation.

Due to the shortage of freshwater around the world, seawater is becoming an important water source. However, seawater contains a high concentration of bromide that can form harmful disinfection by-products during water disinfection. Therefore, the current seawater reverse osmosis (SWRO) has to adopt two-pass reverse osmosis (RO) configuration for effective bromide removal, increasing the overall desalination cost. In this study, a bromide selective composite electrode was developed for membrane capacitive deionisation (MCDI). The composite electrode was developed by coating a mixture of bromide selective resin and anion exchange polymer on the surface of the commercial activated carbon electrode, and its performance was compared to that of conventional carbon electrode. The results demonstrated that the composite electrode has ten times better bromide selectivity than the conventional carbon electrode. The study shows the potential application of MCDI for the selective removal of target ions from water sources and the potential for resource recovery through basic modification of commercial electrode. [Display omitted] • Bromide selective electrode was prepared using bromide selective resin for MCDI application. • Electrode showed significant bromide selectivity from a mixture of multiple anions. • Commercial carbon electrode can be modified to improve ion-selectivity. • MCDI can be a useful technology for target ion removal and resource recovery. [ABSTRACT FROM AUTHOR]