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<p>To achieve high-value utilization of fly ash and develop efficient adsorbents for dye wastewater treatment, this study employed coal-fired power plant fly ash as the raw material and MgCl₂ as the magnesium source. Magnesium-containing zeolite-type calcined fly ash adsorbent materials were synthesized via high-temperature calcination activation and hydrothermal methods. The materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) surface area analysis, and Fourier-transform infrared spectroscopy (FT-IR). Results confirmed the formation of a composite zeolite structure comprising MAPO-43 and Na-P1 phases, with a specific surface area of 69.8607 m<sup>2</sup>/g and an average pore diameter of 11.2853&#xa0;nm. Magnesium was successfully doped into the lattice, resulting in modified crystalline structures. Using methylene blue (MB) as the target pollutant, systematic investigations were conducted on the effects of adsorbent dosage, initial concentration, pH, and temperature on adsorption performance. The optimal conditions were identified as follows: adsorbent dosage 0.2&#xa0;g, initial MB concentration 50&#xa0;mg/L, pH 6, temperature 35&#xa0;°C, and reaction time 100&#xa0;min, under which the MB removal rate reached a maximum of 99.95%. Kinetic studies indicated that the adsorption process followed the pseudo-second-order model (R<sup>2</sup> ≥ 0.9998), suggesting chemisorption behavior. Isotherm data were well-fitted by the Langmuir model (R<sup>2</sup> ≥ 0.9765), indicating monolayer adsorption. Thermodynamic analysis revealed ΔH<sup>0</sup> &gt; 0, ΔS<sup>0</sup> &gt; 0, and ΔG<sup>0</sup> &lt; 0, demonstrating that the adsorption was a spontaneous and endothermic process. After five consecutive adsorption–desorption cycles, the material maintained over 90% of its adsorption capacity, exhibiting excellent regeneration stability. This research provides theoretical and technical support for the resource utilization of solid waste and the development of novel high-efficiency adsorbents, offering both environmental benefits and promising application prospects.</p>

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Preparation and Adsorption Properties of Magnesium-Containing Zeolite-Type Calcined Fly Ash

  • 期刊论文

  • 发表日期：

    2026年2月14日

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  • Jing Bai,
  • Lai Wei

摘要

To achieve high-value utilization of fly ash and develop efficient adsorbents for dye wastewater treatment, this study employed coal-fired power plant fly ash as the raw material and MgCl₂ as the magnesium source. Magnesium-containing zeolite-type calcined fly ash adsorbent materials were synthesized via high-temperature calcination activation and hydrothermal methods. The materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) surface area analysis, and Fourier-transform infrared spectroscopy (FT-IR). Results confirmed the formation of a composite zeolite structure comprising MAPO-43 and Na-P1 phases, with a specific surface area of 69.8607 m2/g and an average pore diameter of 11.2853 nm. Magnesium was successfully doped into the lattice, resulting in modified crystalline structures. Using methylene blue (MB) as the target pollutant, systematic investigations were conducted on the effects of adsorbent dosage, initial concentration, pH, and temperature on adsorption performance. The optimal conditions were identified as follows: adsorbent dosage 0.2 g, initial MB concentration 50 mg/L, pH 6, temperature 35 °C, and reaction time 100 min, under which the MB removal rate reached a maximum of 99.95%. Kinetic studies indicated that the adsorption process followed the pseudo-second-order model (R2 ≥ 0.9998), suggesting chemisorption behavior. Isotherm data were well-fitted by the Langmuir model (R2 ≥ 0.9765), indicating monolayer adsorption. Thermodynamic analysis revealed ΔH0 > 0, ΔS0 > 0, and ΔG0 < 0, demonstrating that the adsorption was a spontaneous and endothermic process. After five consecutive adsorption–desorption cycles, the material maintained over 90% of its adsorption capacity, exhibiting excellent regeneration stability. This research provides theoretical and technical support for the resource utilization of solid waste and the development of novel high-efficiency adsorbents, offering both environmental benefits and promising application prospects.