Study on the Conditions of Oxidation of Nitrogen Dioxide and Nitrite by Manganese Dioxide

Abstract:

The conditions of oxidation of nitrite by manganese dioxide in the solution was studied, with sodium nitrite was used as the sample, respectively. Experiment results showed that the stronger oxidation to nitrite in strong acid, but nitrous acid is instable, escaping NO₂ out from the solution. When pH=3.5, the oxidation rate of nitrite with manganese dioxide was better. The concentration of nitrite tended forward to be stable after 30min. After reaction, the oxidizing power of manganese dioxide which was treated by dilute sulfuric acid wasn't enhanced. The manganese dioxide treated by acid reacted with fresh nitrite solution and the effect wasn't good. The process of oxidation could be go on and the concentration of nitrite would decrease obviously when fresh manganese dioxide used to react the same original nitrite. Maybe some active sites exist at the surface of manganese dioxide. When the reaction equilibrium was reached, the active point at the surface of manganese dioxide would probably have disappeared. The property of oxidation of manganese dioxide to nitrite could be used in treat NO₂ and nitrite. Combining the two methods which absorption of NO₂ by base and oxidation of NO₂ or nitrite by manganese dioxide, NO₂ would be treated completely and treatment cost would be lower.

• Periodical: Advanced Materials Research (Volume 908)
• Pages: 163-166
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.908.163
• Online since: March 2014
• Authors: Zhao Long Huang*, Shao Ping Feng, Su Yan Yin, Li Zen Hui, Ying He, Yan Jiang
• Keywords: Manganese Dioxide, Nitrite, Nitrogen Dioxide, Reaction Conditions

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