Decolorization of methyl orange by MnO2/organic acid system: The role of Mn(III)

Lijun Zhu, Hao Cheng, Jianfeng Ma, Yong Kong, Yong Qin, Sridhar Komarneni

Research output: Contribution to journalArticle

Abstract

Decolorization of methyl orange (MO) by MnO2 was investigated with and without small molecules of organic acids such as formic acid. It was found that the decolorization could be significantly improved by MnO2 with the assistance of organic acids. The effect of various conditions was investigated on MO decolorization by using different crystal types of MnO2 and changing the types of organic acids. One of the optimum treatment conditions was δ-MnO2/formic acid system, which led to the removal efficiency of 90.6% at 30 min. The pseudo-second-order kinetic rate constant of δ-MnO2/formic acid was 0.1626. A reasonable decolorization mechanism involving Mn(III) species was proposed and the mechanism was validated by simple detection of ionic species such as, Mn(II) and Mn(III) during the reaction. The δ-MnO2/formic acid process designed here may lead to a new advanced oxidation technology based on the in-situ generation of active Mn(III) species and their ability for oxidation.

Original languageEnglish (US)
Article number110670
JournalMaterials Research Bulletin
Volume122
DOIs
StatePublished - Feb 2020

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formic acid
Organic acids
Formic acid
acids
Oxidation
oxidation
Rate constants
Crystals
Molecules
Kinetics
methyl orange
kinetics

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Zhu, Lijun ; Cheng, Hao ; Ma, Jianfeng ; Kong, Yong ; Qin, Yong ; Komarneni, Sridhar. / Decolorization of methyl orange by MnO2/organic acid system : The role of Mn(III). In: Materials Research Bulletin. 2020 ; Vol. 122.
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abstract = "Decolorization of methyl orange (MO) by MnO2 was investigated with and without small molecules of organic acids such as formic acid. It was found that the decolorization could be significantly improved by MnO2 with the assistance of organic acids. The effect of various conditions was investigated on MO decolorization by using different crystal types of MnO2 and changing the types of organic acids. One of the optimum treatment conditions was δ-MnO2/formic acid system, which led to the removal efficiency of 90.6{\%} at 30 min. The pseudo-second-order kinetic rate constant of δ-MnO2/formic acid was 0.1626. A reasonable decolorization mechanism involving Mn(III) species was proposed and the mechanism was validated by simple detection of ionic species such as, Mn(II) and Mn(III) during the reaction. The δ-MnO2/formic acid process designed here may lead to a new advanced oxidation technology based on the in-situ generation of active Mn(III) species and their ability for oxidation.",
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Decolorization of methyl orange by MnO2/organic acid system : The role of Mn(III). / Zhu, Lijun; Cheng, Hao; Ma, Jianfeng; Kong, Yong; Qin, Yong; Komarneni, Sridhar.

In: Materials Research Bulletin, Vol. 122, 110670, 02.2020.

Research output: Contribution to journalArticle

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T1 - Decolorization of methyl orange by MnO2/organic acid system

T2 - The role of Mn(III)

AU - Zhu, Lijun

AU - Cheng, Hao

AU - Ma, Jianfeng

AU - Kong, Yong

AU - Qin, Yong

AU - Komarneni, Sridhar

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