The study of bromate adsorption onto magnetic ion exchange resin: Optimization using response surface methodology

The purpose of this study is to investigate the adsorption performance of bromate in water with magnetic ion exchange (MIEX) resin. In batch experiments, various factors affecting bromate adsorption are discussed, including initial solution pH and concentration, adsorption time, natural organic matter, coexistent anions, stirring intensity, adsorbent dosage, bed volume and ion strength. In addition, the main factors affecting adsorption efficiency of bromate are studied by the response surface methodology. Kinetic data and the sorption equilibrium agree well with the pseudo-first-order model and Langmuir, respectively. To sum up, bromate adsorption on the MIEX resin involves physical adsorption and chemisorption. In addition, the saturated sodium chloride solution can be used to effectively regenerate the MIEX resin. MIEX resin has strong adsorption capacity for bromate is shown by a series of experiments and characterizations, which lays a foundation for the practical application of water treatment in the future.