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<p>Magnetic silica molecular sieves have garnered significant attention for their combined molecular sieving properties and magnetic responsiveness, offering promising applications in catalysis and environmental remediation. This study systematically investigates the hydrothermal synthesis of silicalite-1 composites incorporating transition metal ferrites (Mg, Zn, Ni, Co) to develop magnetically separable molecular sieves. Through controlled variation of synthesis parameters including template concentration, water-to-silicon ratio, crystallization temperature and duration, we established optimal conditions yielding well-defined crystalline materials with preserved framework integrity. Comprehensive characterization through vibrating sample magnetometry, X-ray diffraction, and electron microscopy revealed that the incorporated magnetic nanoparticles (12–18&#xa0;nm) maintain their spinel structure while causing only minimal distortion to the host molecular sieve matrix. The optimized composites demonstrated tunable soft magnetic properties with saturation magnetization values spanning 0.52–16.13 emu/g, dependent on ferrite composition and loading. Notably, the synthesis protocol achieved precise control over particle size (400–600&#xa0;nm) and crystallinity while enabling efficient magnetic separation. This work provides fundamental insights into the structure-property relationships of magnetic zeolite composites, establishing a robust platform for their rational design in advanced separation and catalytic applications.</p>

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Influencing factors and mechanisms in the magnetic silica molecular sieves Preparation process

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Lei Zhang,
  • Haocheng Zhao,
  • Qi Wang,
  • Lei Zhang,
  • Ruikang Song

摘要

Magnetic silica molecular sieves have garnered significant attention for their combined molecular sieving properties and magnetic responsiveness, offering promising applications in catalysis and environmental remediation. This study systematically investigates the hydrothermal synthesis of silicalite-1 composites incorporating transition metal ferrites (Mg, Zn, Ni, Co) to develop magnetically separable molecular sieves. Through controlled variation of synthesis parameters including template concentration, water-to-silicon ratio, crystallization temperature and duration, we established optimal conditions yielding well-defined crystalline materials with preserved framework integrity. Comprehensive characterization through vibrating sample magnetometry, X-ray diffraction, and electron microscopy revealed that the incorporated magnetic nanoparticles (12–18 nm) maintain their spinel structure while causing only minimal distortion to the host molecular sieve matrix. The optimized composites demonstrated tunable soft magnetic properties with saturation magnetization values spanning 0.52–16.13 emu/g, dependent on ferrite composition and loading. Notably, the synthesis protocol achieved precise control over particle size (400–600 nm) and crystallinity while enabling efficient magnetic separation. This work provides fundamental insights into the structure-property relationships of magnetic zeolite composites, establishing a robust platform for their rational design in advanced separation and catalytic applications.