Green Synthesis of Colloidal and Nanostructured MnO2 by Solution Plasma Process

Hyemin Kim

doi:10.3740/MRSK.2023.33.7.315

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2023 Vol.33, Issue 7 Preview Page

Research Paper

Green Synthesis of Colloidal and Nanostructured MnO₂ by Solution Plasma Process 용액 플라즈마를 이용한 콜로이드 및 나노 구조 MnO₂의 친환경 합성

27 July 2023. pp. 315-322

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Abstract

In the present work, we address the new route for the green synthesis of manganese dioxide (MnO₂) by an innovative method named the solution plasma process (SPP). The reaction mechanism of both colloidal and nanostructured MnO₂ was investigated. Firstly, colloidal MnO₂ was synthesized by plasma discharging in KMnO₄ aqueous solution without any additives such as reducing agents, acids, or base chemicals. As a function of the discharge time, the purple color solution of MnO₄^- (oxidation state +7) was changed to the brown color of MnO₂ (oxidation state +4) and then light yellow of Mn²⁺ (oxidation state +2). Based on the UV-vis analysis we found the optimal discharging time for the synthesis of stable colloidal MnO₂ and also reaction mechanism was verified by optical emission spectroscopy (OES) analysis. Secondly, MnO₂ nanoparticles were synthesized by SPP with a small amount of reducing sugar. The precipitation of brown color was observed after 8 min of plasma discharge and then completely separated into colorless solution and precipitation. It was confirmed layered type of nanoporous birnessite-MnO₂ by X-ray powder diffraction (XRD), fourier-transform infrared spectroscopy (FT-IR), and electron microscopes. The most important merits of this approach are environmentally friendly process within a short time compared to the conventional method. Moreover, the morphology and the microstructure could be controllable by discharge conditions for the appropriate potential applications, such as secondary batteries, supercapacitors, adsorbents, and catalysts.

Keywords

manganese dioxide

MnO₂

birnessite

solution plasma process

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 33
No :7
Pages :315-322
Received Date : 2023-06-23
Revised Date : 2023-07-19
Accepted Date : 2023-07-21
DOI :https://doi.org/10.3740/MRSK.2023.33.7.315

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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