Abstract
Biochar-activated peroxydisulfate oxidation technology has received more and more attention due to its low metal ion leakage rate and low solid waste post-treatment requirement. In this paper, rice straw biochar-activated peroxydisulfate oxidation technology is used for the first time to oxidize nitric oxide (NO) from flue gas through inducing free radicals. The mechanism of NO oxidation removal is mainly explored. The main factors affecting NO removal, removal products and free radicals are also systematically studied. Results show that the main product of NO oxidation removal is NO3− and no extra by-product is formed. ·OH is identified as the first important free radical for oxidizing NO, while SO4−· is determined to be the second important free radical for oxidizing NO. Peroxydisulfate oxidation only plays a minor supplementary role in NO removal. Increasing rice straw biochar mass concentration and operation temperature promote NO removal. Increasing NO concentration and solution pH value are found to be harmful to NO removal. Increasing peroxydisulfate concentration first increases and then decreases NO removal efficiency. Under optimized process parameters, the maximum NO removal efficiency reaches 95.2%.
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