Volume 18 Issue 2
Jun.  2025
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Sin Ling Chiam, Swee-Yong Pung, Chee Meng Koe, Fei Yee Yeoh. 2025: Immobilization of MnO2 nanoflowers on coils using direct heating method for organic pollutant remediation. Water Science and Engineering, 18(2): 165-176. doi: 10.1016/j.wse.2024.09.001
Citation: Sin Ling Chiam, Swee-Yong Pung, Chee Meng Koe, Fei Yee Yeoh. 2025: Immobilization of MnO2 nanoflowers on coils using direct heating method for organic pollutant remediation. Water Science and Engineering, 18(2): 165-176. doi: 10.1016/j.wse.2024.09.001
shu

Immobilization of MnO2 nanoflowers on coils using direct heating method for organic pollutant remediation

doi: 10.1016/j.wse.2024.09.001

  • a. School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal 14300, Pulau Pinang, Malaysia;

  • b. School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal 14300, Pulau Pinang, Malaysia

Funds:

This work was supported by Ministry of Higher Education, Malaysia, through the Fundamental Research Grant Scheme (FRGS) (Grant No. FRGS/1/2020/TK0/USM/02/27).

  • Received Date: 2023-12-19
  • Accepted Date: 2024-08-29
    • Available Online: 2025-06-24
    Abstract
  • The immobilization of catalysts on supporting substrates for the removal of organic pollutants is a crucial strategy for mitigating catalyst loss during wastewater treatment. This study presented a rapid and cost-effective direct heating method for synthesizing MnO2 nanoflowers on coil substrates for the removal of organic pollutants. Traditional methods often require high power, expensive equipment, and long synthesis times. In contrast, the direct heating approach successfully synthesized MnO2 nanoflowers in just 10 min with a heating power of approximately 40 W·h after the heating power and duration were optimized. These nanoflowers effectively degraded 99% Rhodamine B in 60 min with consistent repeatability. The catalytic mechanisms are attributed to crystal defects in MnO2, which generate electrons to produce H2O2. Mn2+ ions in the acidic solution further dissociate H2O2 molecules into hydroxyl radicals (·OH). The high efficiency of this synthesis method and the excellent reusability of MnO2 nanoflowers highlight their potential as a promising solution for the development of supporting MnO2 catalysts for organic dye removal applications.

     

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