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<p>This study investigated the adsorption of methylene blue (MB) from aqueous solution onto phosphorylated sawdust. The adsorbent was successfully synthesized using deep eutectic solvents (DES) as a green modification medium. Comprehensive characterization (FTIR, XRD, TGA, SEM) confirmed the structural changes induced by phosphorylation. Batch adsorption experiments optimized key parameters (pH, incubation time, dosage, initial concentration), achieving a maximum MB removal efficiency of 97.5 ± 1.0% and a Langmuir monolayer adsorption capacity of 355.87&#xa0;mg/g. Kinetic studies revealed that the adsorption followed the pseudo-second-order model, while equilibrium data were best described by the Langmuir isotherm, suggesting homogeneous monolayer adsorption. The DES-based phosphorylation method presents a novel and efficient approach for enhancing sawdust adsorption capacity and valorizing forestry waste.</p>

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Phosphorylated Sawdust Synthesized via Guanidine Phosphate Deep Eutectic Solvent: Preparation and Its Dye Adsorption Performance

  • 期刊论文

  • 发表日期：

    2026年4月17日

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  • Hao Li,
  • Lebin Zhao,
  • Wen Chen,
  • Zhubao Shao,
  • Kaitao Zhang

摘要

This study investigated the adsorption of methylene blue (MB) from aqueous solution onto phosphorylated sawdust. The adsorbent was successfully synthesized using deep eutectic solvents (DES) as a green modification medium. Comprehensive characterization (FTIR, XRD, TGA, SEM) confirmed the structural changes induced by phosphorylation. Batch adsorption experiments optimized key parameters (pH, incubation time, dosage, initial concentration), achieving a maximum MB removal efficiency of 97.5 ± 1.0% and a Langmuir monolayer adsorption capacity of 355.87 mg/g. Kinetic studies revealed that the adsorption followed the pseudo-second-order model, while equilibrium data were best described by the Langmuir isotherm, suggesting homogeneous monolayer adsorption. The DES-based phosphorylation method presents a novel and efficient approach for enhancing sawdust adsorption capacity and valorizing forestry waste.