High-performance quaternary ammonium-functionalized chitosan/graphene oxide composite aerogel for remelt syrup decolorization in sugar refining,Chemical Engineering Journal

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High-performance quaternary ammonium-functionalized chitosan/graphene oxide composite aerogel for remelt syrup decolorization in sugar refining
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2021-09-23 , DOI: 10.1016/j.cej.2021.132575
Yao Xiao _{1,

2} , Hai-Qin Lu ₁ , Chang-Rong Shi _{1,

3} , Fu-Hou Lei ₂ , Darryn Rackemann ₃ , Kai Li ₁ , Wen Li _{2,

4,

5} , William O.S. Doherty ₃

Affiliation

The decolorization of remelt syrup is the most critical step in the sugar refining process as it directly affects the quality of refined sugar. Adsorption is a useful method that can be applied to decolorize the syrup. A quaternary ammonium-functionalized chitosan/graphene oxide composite aerogel (GO-QACSA) was developed as an effective adsorbent for the removal of high-molecular-weight reducing sugar alkaline degradation products (HRSADPs), the main class of colorants in remelt syrup. The advantages of GO-QACSA to remove HRSADPs can be attributed to its well-connected 3-D network-like porous structure, nontoxicity, high hydrophilicity, and the richness of quaternary ammonium groups. The equilibrium adsorption capacity of GO-QACSA for HRSADPs reached 364.09 mg/g and the removal rate was > 90%. GO-QACSA exhibited an ultra-fast adsorption rate. Recycling experiments indicated that GO-QACSA exhibited good renewability and reusability. The interaction mechanism for the adsorption of HRSADP on GO-QACSA was studied, and the results revealed that two layers of HRSADPs adhered to the surface of GO-QACSA via electrovalent bonds formed between the quaternary ammonium and carboxylate groups. On average, 2–3 carboxylate ions in one HRSADP molecule bonded with the quaternary ammonium cations of GO-QACSA. Four phenomenological mathematical models, namely, External mass transfer resistance (EMTR), Internal mass transfer resistance (IMTR), combined EMTR–IMTR, and Adsorption on active sites (AAS), were presented based on the best-fit equilibrium isotherms. These models could be used to provide new insights into the adsorption mass transfer behaviors of the system.

中文翻译：

高性能季铵功能化壳聚糖/氧化石墨烯复合气凝胶用于制糖重熔糖浆脱色

重熔糖浆脱色是制糖过程中最关键的一步，直接影响精制糖的质量。吸附是一种可用于糖浆脱色的有用方法。季铵功能化壳聚糖/氧化石墨烯复合气凝胶（GO-QACSA）被开发为一种有效的吸附剂，用于去除高分子量还原糖碱性降解产物（HRSADP），这是重熔糖浆中的主要着色剂。 GO-QACSA去除HRSADPs的优势可归因于其连接良好的3D网络状多孔结构、无毒性、高亲水性和丰富的季铵基团。 GO-QACSA对HRSADPs的平衡吸附容量达到364.09 mg/g，去除率>90%。 GO-QACSA 表现出超快的吸附速率。回收实验表明GO-QACSA表现出良好的可再生性和可重复使用性。研究了HRSADP在GO-QACSA上吸附的相互作用机制，结果表明两层HRSADP通过季铵基团和羧酸根基团之间形成的电价键粘附在GO-QACSA表面。平均而言，一个 HRSADP 分子中有 2-3 个羧酸根离子与 GO-QACSA 的季铵阳离子键合。基于最佳拟合平衡等温线，提出了四种唯象数学模型，即外部传质阻力（EMTR）、内部传质阻力（IMTR）、组合EMTR-IMTR和活性位点吸附（AAS）。这些模型可用于为系统的吸附传质行为提供新的见解。

更新日期：2021-09-23

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