Simultaneous removal of SO2 and NO by FeII(EDTA) solution: promotion of Mn powder and mechanism of reduction

Yankai Duo, Xiaoping Wang, Jinjia He, Shihan Zhang, Hua Pan, Jianmeng Chen, Jun Chen

Research output: Contribution to journalArticlepeer-review

Abstract

The effect of Mn powder addition on the simultaneous removal of SO2 and NO coupled with FeII(EDTA) absorption was investigated in this work. In the NO absorption system with FeII(EDTA), SO2 reduced FeII(EDTA)-NO to FeII(EDTA) with a reduction efficiency reaching 88.5% under the conditions of 4000 mg/m3 SO2, pH 8.0, 44 °C, and the flow rate of 1.2 L/min within 60 min. Introducing 0.1 M Mn powder with SO2 increased the FeII(EDTA)-NO reduction efficiency to 96.8% within 5 min. SO2 was also removed by reducing FeII(EDTA)-NO and converted into SO4 2- at a removal efficiency of 100%. After adding Mn powder, NO was removed through the following reaction: 5Mn+2FeII(EDTA)−NO+12H+⟶2FeII(EDTA)+5Mn2++2NH4++2H2O. Mn powder functioned as a reductant to regenerate the absorption of solution, and the coordinated NO in FeII(EDTA)-NO was reduced to NH4 +. The resource utilization rate of N reached approximately 77.2%. The integrated technology is a potential solution for flue gas treatment in industrial sectors with coal-fired power plants and industrial boiler. [Figure not available: see fulltext.].

Original languageEnglish (US)
Pages (from-to)28808-28816
Number of pages9
JournalEnvironmental Science and Pollution Research
Volume26
Issue number28
DOIs
StatePublished - Oct 1 2019
Externally publishedYes

Keywords

  • Fe(EDTA)
  • Mechanism
  • Mn powder
  • Nitric oxide
  • Reduction
  • Sulfur dioxide

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Health, Toxicology and Mutagenesis

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