Removal of Bromate from Water by Silver-Supported Activated Carbon

Batch experiments were conducted to make a comparison in bromate removal between the silver-supported activated carbon (silver-AC) and virgin grander activated carbon(GAC). The probable mechanism of the better behavior of silver-AC was discussed. The effect of initial bromate concentration, pH and co-exist anions were also investigated in the study. Results showed that the removal efficiency of bromate increased about 25% by using silver-AC, a much better removal. Bromate reduction by silver-AC increases as the solution pH decreases. And the bigger the initial concentration was, the larger of BrO3 - removal capacity by silver-AC was. Cl-, F- and Br- had a slight effect on the removal of BrO3 - while SO4 2-, CO3 2-, NO3 - and PO4 3- showed a stronger influence. The affinity of the anions for silver-AC sites decreased in the following order CO3 2- > PO4 3- > SO4 2- > NO3 - > Br- > Cl- > F- when the co-exist anion concentration was 10 mg/L.