Scholarlink

<p>This study reports the development of a partially bio-based polyurethane–acrylate–alginate (PUA–alginate) hybrid adsorbent engineered for the removal of Cu²⁺ and Fe³⁺ ions from aqueous solutions. A vanillin-derived Schiff-base acrylate was synthesized and incorporated into a polyurethane–acrylate network to introduce imine, hydroxyl, and ester functionalities capable of coordinating transition metal ions. Sodium alginate, a renewable polysaccharide, was integrated as a secondary phase to enhance hydrophilicity, swelling behavior, and the density of oxygen-rich binding sites. The resulting hybrid materials were prepared as dispersions and as ionically crosslinked hydrogel beads. Structural evolution from vanillin to Schiff base and acrylated monomer was confirmed by ATR-FTIR and ¹H NMR spectroscopy. Polyurethane–acrylate formation and full isocyanate consumption were validated through FTIR and NCO titration. Adsorption experiments performed at pH 6.8 ± 0.2 demonstrated high uptake capacities for both ions, with maximum values of 77.6&#xa0;mg g⁻¹ (Cu²⁺) and 76.0&#xa0;mg g⁻¹ (Fe³⁺) for the PUA matrix, and 76.2&#xa0;mg g⁻¹ (Cu²⁺) and 79.2&#xa0;mg g⁻¹ (Fe³⁺) for the alginate-modified systems. The enhanced affinity toward Fe³⁺ in the hybrid beads is attributed to the combined contributions of imine nitrogen, urethane and ester carbonyls, and alginate carboxylates, enabling synergistic electrostatic and coordination interactions. These results position the PUA–alginate system as an effective and structurally tunable platform for transition-metal ion adsorption. While the current work establishes synthesis, structural validation, and preliminary adsorption performance, further investigation into adsorption isotherms, kinetic modeling, and sorbent regeneration is required to assess long-term applicability in wastewater treatment.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

A Concise Study on Synthesis and Performance Evaluation of a Partially Bio-Based Polyurethane–Acrylate–Alginate Hybrid Adsorbent for Cu²⁺ and Fe³⁺ Removal

  • 期刊论文

  • 发表日期：

    2026年2月20日

查看全文
  • Balasubramanian Pillai,
  • Siddhesh Mestry,
  • Pavan Borse,
  • Jyoti Darsan Mohanty,
  • Shashank Mhaske

摘要

This study reports the development of a partially bio-based polyurethane–acrylate–alginate (PUA–alginate) hybrid adsorbent engineered for the removal of Cu²⁺ and Fe³⁺ ions from aqueous solutions. A vanillin-derived Schiff-base acrylate was synthesized and incorporated into a polyurethane–acrylate network to introduce imine, hydroxyl, and ester functionalities capable of coordinating transition metal ions. Sodium alginate, a renewable polysaccharide, was integrated as a secondary phase to enhance hydrophilicity, swelling behavior, and the density of oxygen-rich binding sites. The resulting hybrid materials were prepared as dispersions and as ionically crosslinked hydrogel beads. Structural evolution from vanillin to Schiff base and acrylated monomer was confirmed by ATR-FTIR and ¹H NMR spectroscopy. Polyurethane–acrylate formation and full isocyanate consumption were validated through FTIR and NCO titration. Adsorption experiments performed at pH 6.8 ± 0.2 demonstrated high uptake capacities for both ions, with maximum values of 77.6 mg g⁻¹ (Cu²⁺) and 76.0 mg g⁻¹ (Fe³⁺) for the PUA matrix, and 76.2 mg g⁻¹ (Cu²⁺) and 79.2 mg g⁻¹ (Fe³⁺) for the alginate-modified systems. The enhanced affinity toward Fe³⁺ in the hybrid beads is attributed to the combined contributions of imine nitrogen, urethane and ester carbonyls, and alginate carboxylates, enabling synergistic electrostatic and coordination interactions. These results position the PUA–alginate system as an effective and structurally tunable platform for transition-metal ion adsorption. While the current work establishes synthesis, structural validation, and preliminary adsorption performance, further investigation into adsorption isotherms, kinetic modeling, and sorbent regeneration is required to assess long-term applicability in wastewater treatment.