Hydrogen peroxide decomposition on manganese oxide (pyrolusite): Kinetics, intermediates, and mechanism
- Authors
- Do, Si-Hyun; Batchelor, Bill; Lee, Hong-Kyun; Kong, Sung-Ho
- Issue Date
- Mar-2009
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Hydrogen peroxide; Manganese oxide; [H2O2]/[= MnO2]; Hydroperoxide/superoxide anion; Pseudo first-order model
- Citation
- CHEMOSPHERE, v.75, no.1, pp.8 - 12
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMOSPHERE
- Volume
- 75
- Number
- 1
- Start Page
- 8
- End Page
- 12
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/177180
- DOI
- 10.1016/j.chemosphere.2008.11.075
- ISSN
- 0045-6535
- Abstract
- The objective of this study is the kinetic interpretation of hydrogen peroxide decomposition on manganese oxide (pyrolusite) and the explanation of the reaction mechanism including the hydroperoxide/superoxide anion. The decomposition of hydrogen peroxide on manganese oxide at pH 7 was represented by a pseudo first-order model. The maximum value of the observed first-order rates constants (k(obs)) was 0.741 min(-1) at 11.8 of [H2O2]/[= MnO2] when [H2O2]/[= MnO2] were ranged from 58.8 to 3.92. The pseudo first-order rate constants (k(MnO2)) approximated as the average value of 0.025 (min mM)(-1) with a standard deviation of 0.003 at [H2O2]/[= MnO2] ranged from 39.2 to 11.8. When [H2O2]/[= MnO2] was 3.92, the rate constants (k(MnO2)) was 0.061 (min mM)(-1) as maximum. Oxygen production showed that the initial rates increased with decreasing [H2O2]/[= MnO2] and the total amounts of oxygen was slightly less than the stoichiometric value (0.5) in most experiments. However, oxygen was produced at more than 0.5 in low [H2O2]/[= MnO2] (i.e. 3.92 and 9.79). The relative production of hydroperoxide/superoxide anion implied that the production increased with low [H2O2]/[= MnO2], and the existence of anions Suggested that the mechanism includes propagation reactions with intermediates such as hydroperoxide/Superoxide anion in solution. In addition, both [H2O2] decomposition and the production of anion were accelerated in alkaline solution. Manganese ion dissolved into solution was negligible in neutral and alkaline conditions, but it greatly increased in acidic conditions.
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