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<p>In response to the high efficiency and economic degradation requirements of typical VOC pollutants benzene, this study synthesized a new type of rice husk-fly ash-based geopolymer microsphere (RFG) as an adsorbent through suspension solidification method, which was used to recover and enrich Cu(II) and Mn(III) from wastewater. The supported bimetallic oxide catalyst CuMnO<sub><i>x</i></sub>/RFG was successfully prepared by oxygen calcination of adsorption products. CuMn<sub>0.6</sub>O<sub><i>x</i></sub>/RFG has a mesoporous structure and uniform distribution of Cu-Mn. At a mass space velocity of 4000&#xa0;ml/(g · h), the benzene conversion rate is as high as 99.7% and the T<sub>90</sub> is as low as 273℃. Even after 5 cycles and high humidity environment, its benzene conversion rate remains above 93%. The catalytic effect on benzene is improved by about 30%, and the required energy barrier is reduced by 15.4%, demonstrating efficient low-temperature catalytic oxidation ability and good stability. Its excellent low-temperature performance is attributed to: (1) Mesoporous carriers possess mechanical properties, sintering resistance, and water resistance. High specific surface area ensures high dispersion of active components, promotes benzene adsorption and exposure of active centers; (2) Cu-Mn synergistically reduces component particle size and crystallinity, increases Mn<sup>3+</sup>/Mn<sup>+</sup> ratio and oxygen vacancy density, and accelerates lattice oxygen activation and migration. The entire preparation and application process integrates solid waste utilization-heavy metal adsorption-VOCs catalysis, achieving high value-added utilization of fly ash and providing an effective way to synthesize efficient, low-cost, halogen-free, and environmentally friendly supported catalysts.</p>

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Preparation of Self-grow Bimetallic Catalysts by Recovering Cu (II) and Mn (III) using Fly Ash-based Geopolymer Microspheres

  • 期刊论文

  • 发表日期：

    2025年12月4日

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  • Cheng Zeng,
  • Dejun Chen,
  • Yuxi Chao,
  • Guangqing Fu,
  • Yunchi Yang,
  • Mengqi Zhao,
  • Yinnian Liao

摘要

In response to the high efficiency and economic degradation requirements of typical VOC pollutants benzene, this study synthesized a new type of rice husk-fly ash-based geopolymer microsphere (RFG) as an adsorbent through suspension solidification method, which was used to recover and enrich Cu(II) and Mn(III) from wastewater. The supported bimetallic oxide catalyst CuMnOx/RFG was successfully prepared by oxygen calcination of adsorption products. CuMn0.6Ox/RFG has a mesoporous structure and uniform distribution of Cu-Mn. At a mass space velocity of 4000 ml/(g · h), the benzene conversion rate is as high as 99.7% and the T90 is as low as 273℃. Even after 5 cycles and high humidity environment, its benzene conversion rate remains above 93%. The catalytic effect on benzene is improved by about 30%, and the required energy barrier is reduced by 15.4%, demonstrating efficient low-temperature catalytic oxidation ability and good stability. Its excellent low-temperature performance is attributed to: (1) Mesoporous carriers possess mechanical properties, sintering resistance, and water resistance. High specific surface area ensures high dispersion of active components, promotes benzene adsorption and exposure of active centers; (2) Cu-Mn synergistically reduces component particle size and crystallinity, increases Mn3+/Mn+ ratio and oxygen vacancy density, and accelerates lattice oxygen activation and migration. The entire preparation and application process integrates solid waste utilization-heavy metal adsorption-VOCs catalysis, achieving high value-added utilization of fly ash and providing an effective way to synthesize efficient, low-cost, halogen-free, and environmentally friendly supported catalysts.