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In the Ag(II)/Ag(I) redox mediator integrated scrubber system, NO reacts with the Ag(II) ions produced by the electrochemical oxidation of Ag(I) in an electrochemical cell present in the scrubbing solution (aqueous HNO 3 acid) to form NO 2 . This NO 2 is then absorbed into the scrubbing solution and degraded to nitrate. Numerous experimental runs were carried out to evaluate the feasibility of the integrated system to treat industrial waste gases containing high NO x levels. The results showed that the levels of NO and NO x removal increased with increasing Ag(II) loading and contact time. Under optimized conditions, 93.5% and 73.3% of the NO and NO x , respectively, were removed by a single stage gas scrubber with 1.62 g L −1 Ag(II) operating at 25 °C and atmospheric pressure. |
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