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<p>A unique carrier-free, self-assembled hierarchical microsphere ZnFe-layered double hydroxide (ZnFe-LDH) composed of highly active ultra-thin LDH nanosheets was prepared by the co-precipitation oxidation method and applied to dynamic adsorption experiments for H<sub>2</sub>S removal at room temperature. The successful preparation of the materials was verified through X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM) characterizations. The effects of flow rate, temperature, particle size, loading capacity, and Zn<sup>2+</sup>/Fe<sup>2+</sup> mole ratio on the removal efficiency were systematically investigated. The results indicated that ZnFe-LDH exhibited the highest removal efficiency for H<sub>2</sub>S, reaching 314&#xa0;mg/g, under the conditions of a Zn<sup>2+</sup>/Fe<sup>2+</sup> mole ratio of 3, a flow rate of 20&#xa0;mL/min, room temperature, a mixed particle size, and a loading capacity of 0.2&#xa0;g. Further analysis using XRD, FT-IR, SEM, N<sub>2</sub> adsorption–desorption experiment and pore size analysis method, and X-ray photoelectron spectroscopy (XPS) after adsorption provided insights into the mechanism of H<sub>2</sub>S adsorption by ZnFe-LDH.</p>

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Simple preparation of ZnFe-LDH hierarchical microspheres with high H2S adsorption capacity at room temperature

  • 期刊论文

  • 发表日期：

    2025年11月15日

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  • Chenyuan Cui,
  • Liting Zhang,
  • Chunmei Zhu,
  • Lu Gong,
  • Zhenying Yao,
  • Siwei Xiang,
  • Kui Qiu,
  • Bo Yu

摘要

A unique carrier-free, self-assembled hierarchical microsphere ZnFe-layered double hydroxide (ZnFe-LDH) composed of highly active ultra-thin LDH nanosheets was prepared by the co-precipitation oxidation method and applied to dynamic adsorption experiments for H2S removal at room temperature. The successful preparation of the materials was verified through X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM) characterizations. The effects of flow rate, temperature, particle size, loading capacity, and Zn2+/Fe2+ mole ratio on the removal efficiency were systematically investigated. The results indicated that ZnFe-LDH exhibited the highest removal efficiency for H2S, reaching 314 mg/g, under the conditions of a Zn2+/Fe2+ mole ratio of 3, a flow rate of 20 mL/min, room temperature, a mixed particle size, and a loading capacity of 0.2 g. Further analysis using XRD, FT-IR, SEM, N2 adsorption–desorption experiment and pore size analysis method, and X-ray photoelectron spectroscopy (XPS) after adsorption provided insights into the mechanism of H2S adsorption by ZnFe-LDH.