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<p>With the growing environmental challenges posed by industrial dye wastewater and agricultural straw waste, the development of cost-effective and high-performance adsorbents has become a research priority. In this study, RCHC was synthesized from RC via hydrothermal carbonization and composited with AWC at a 1:1 mass ratio. The resulting composite, RCHC-ACFC, was modified using FeCl<sub>3</sub>/NaOH and applied for the adsorption of MB from simulated wastewater. The structural and chemical properties of RCHC-ACFC were characterized using SEM, BET, XRD, FTIR, and XPS. Adsorption behavior was systematically analyzed through kinetic, isothermal, and thermodynamic models. RCHC-ACFC exhibited a disordered lamellar structure, well-developed mesoporous channels, and abundant active surface functional groups, achieving an outstanding maximum theoretical MB adsorption capacity of 539.35&#xa0;mg·g<sup>−1</sup> at 45&#xa0;°C. The adsorption process followed the Langmuir isotherm and pseudo-second-order kinetics. Thermodynamic parameters (Δ<i>H</i> &gt; 0, Δ<i>G</i> &lt; 0, Δ<i>S</i> &gt; 0) indicated a chemisorption-driven mechanism supported by physical diffusion. Regeneration tests confirmed the excellent reusability of RCHC-ACFC, offering a promising solution for dye-contaminated water treatment.</p>

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Adsorption Performance of Methylene Blue by FeCl3/NaOH-Modified Hydrothermal Rice Straw Biochar-Activated White Clay Composite

  • 期刊论文

  • 发表日期：

    2026年2月12日

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  • Xueliang Zheng,
  • Yiming Zhang,
  • Yihua Wu,
  • Lixiao Wu,
  • Lijun Wang,
  • Lili Xie,
  • Ziyan Wang

摘要

With the growing environmental challenges posed by industrial dye wastewater and agricultural straw waste, the development of cost-effective and high-performance adsorbents has become a research priority. In this study, RCHC was synthesized from RC via hydrothermal carbonization and composited with AWC at a 1:1 mass ratio. The resulting composite, RCHC-ACFC, was modified using FeCl3/NaOH and applied for the adsorption of MB from simulated wastewater. The structural and chemical properties of RCHC-ACFC were characterized using SEM, BET, XRD, FTIR, and XPS. Adsorption behavior was systematically analyzed through kinetic, isothermal, and thermodynamic models. RCHC-ACFC exhibited a disordered lamellar structure, well-developed mesoporous channels, and abundant active surface functional groups, achieving an outstanding maximum theoretical MB adsorption capacity of 539.35 mg·g−1 at 45 °C. The adsorption process followed the Langmuir isotherm and pseudo-second-order kinetics. Thermodynamic parameters (ΔH > 0, ΔG < 0, ΔS > 0) indicated a chemisorption-driven mechanism supported by physical diffusion. Regeneration tests confirmed the excellent reusability of RCHC-ACFC, offering a promising solution for dye-contaminated water treatment.