Abstract
The effect of the presence of other anions on nitrate reduction was investigated using catalysts supported by TiO2 and nitrate adsorbents (calcium-chloride-treated charcoal and an anion exchange resin). When the TiO2-supported catalyst was used, the nitrate decomposition rate was greatly reduced in the presence of Cl−, SO42−, and PO43−, and the decrease was large for Cl− and PO43−. The activity of the nitrate-adsorbent-supported catalysts in the presence of SO42− and PO43− showed a smaller decrease than that of the TiO2-supported catalyst. In the presence of SO42−, the amount of nitrate adsorbed on the supports was correlated with the decrease in activity, and calcium-chloride-treated charcoal, which has high nitrate adsorption selectivity, showed the smallest decrease in activity in the presence of SO42−. By contrast, in the presence of PO43−, no clear correlation was found between the decrease in the amount of nitrate adsorption on the supports and the decrease in activity.
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