Abstract
In the article, rice straw biochar was applied to activate peroxydisulfate to induce ·OH and SO4−· to oxidize Hg0 in flue gas. The oxidative absorption mechanism of gaseous Hg0 in this designed system was explored. The main technological variables affecting Hg0 oxidative absorption, and the yields of products and free radicals were also studied. Research indicates that Hg0 is mainly removed by SO4−· oxidation and ·OH oxidation. SO4−· is the first important free radical for oxidizing Hg0, and ·OH is the second important free radical for oxidizing Hg0. Hg0 is mainly oxidized to bivalent mercury (Hg2+) in spent solution by the developed absorption system. Peroxydisulfate direct oxidation and biochar catalytic oxidation are also two other Hg0 removal paths, but they only play minor supplementary roles in the Hg0 removal. Hg0 removal efficiency is improved first and then decreased by increasing peroxydisulfate concentrations or rice straw biochar concentrations. Increasing reaction temperature improves the Hg0 removal. Hg0 removal efficiency reduces with higher pH values and Hg0 concentrations. The maximum removal efficiency of Hg0 is up to 96.9% based on the best tested conditions.
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