Scholarlink

<p>Decolorization is critical in sugar refining, where reducing sugar alkaline degradation products (RSADPs) constitute major colorants. Conventional decolorants face limitations including non-renewability, high cost, and narrow applicability. This study developed quaternary ammonium-functionalized chitosan adsorbents (QA) as high-performance and cost-effective alternatives. QA was synthesized via (3-chloro-2-hydroxypropyl) trimethylammonium chloride modification, followed by chemical cross-linking with glutaraldehyde and freeze-drying. QA displayed a more intricate surface morphology with rougher pore walls, while increasing quaternary ammonium-functionalized chitosan (QACS) content contributed to the preservation of the porous framework. Additionally, QA exhibited a stable positive charge (pH 3–11) and industrial-grade thermal stability. Compared to the unmodified chitosan adsorbent, QA exhibited superior adsorption performance and maintained pH-independent functionality, with adsorption capacity increasing with rising QACS content. QA<sub>5</sub> (with 5 wt.% quaternary ammonium-functionalized chitosan) performed optimally, achieving 95.9% RSADPs removal with 172.6 mg/g equilibrium capacity (theoretical max of 287.7 mg/g) and &gt; 15% higher efficiency than unmodified adsorbent. The adsorption kinetics followed the pseudo-second-order model (chemisorption-dominated), and the isotherms fitted the Freundlich model, indicating multilayer heterogeneous adsorption. The QA thus provides an efficient, eco-friendly solution with broad pH tolerance for industrial sugar decolorization.</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

Preparation of Quaternary Ammonium-Functionalized Chitosan Adsorbent: For the Removal of Reducing Sugar Alkaline Degradation Products

  • 期刊论文

  • 发表日期：

    2026年2月12日

查看全文
  • Shiqi Xia,
  • Tongxin Gao,
  • Congli Cui,
  • Chong-hao Bi,
  • Dong Li,
  • Li-jun Wang

摘要

Decolorization is critical in sugar refining, where reducing sugar alkaline degradation products (RSADPs) constitute major colorants. Conventional decolorants face limitations including non-renewability, high cost, and narrow applicability. This study developed quaternary ammonium-functionalized chitosan adsorbents (QA) as high-performance and cost-effective alternatives. QA was synthesized via (3-chloro-2-hydroxypropyl) trimethylammonium chloride modification, followed by chemical cross-linking with glutaraldehyde and freeze-drying. QA displayed a more intricate surface morphology with rougher pore walls, while increasing quaternary ammonium-functionalized chitosan (QACS) content contributed to the preservation of the porous framework. Additionally, QA exhibited a stable positive charge (pH 3–11) and industrial-grade thermal stability. Compared to the unmodified chitosan adsorbent, QA exhibited superior adsorption performance and maintained pH-independent functionality, with adsorption capacity increasing with rising QACS content. QA5 (with 5 wt.% quaternary ammonium-functionalized chitosan) performed optimally, achieving 95.9% RSADPs removal with 172.6 mg/g equilibrium capacity (theoretical max of 287.7 mg/g) and > 15% higher efficiency than unmodified adsorbent. The adsorption kinetics followed the pseudo-second-order model (chemisorption-dominated), and the isotherms fitted the Freundlich model, indicating multilayer heterogeneous adsorption. The QA thus provides an efficient, eco-friendly solution with broad pH tolerance for industrial sugar decolorization.