糖用松香基脱色树脂合成及其吸附己糖碱性降解色素动力学行为机制解析

针对石油基树脂用于精制糖生产回溶糖浆脱色存在食品安全隐患、树脂合成所需原料（石油）不可再生及使用过程易破碎问题，项目利用松香中共轭双键及羧基，将其改性作为交联基体，定向聚合引入功能基团季铵基，合成强碱型松香基大孔阴离子交换树脂（SBRMAER）吸附去除回溶糖浆中最具代表性色素——己糖碱性降解色素（HADPs）。探究HADPs物理化学特异性对SBRMAER结构-性能关键要素取向规律影响及二者深层次关联机制。通过系统理论组建，提出并构建不同形式协同下吸附动力学理论模型，即准一级-二级联合模型、浓度驱动-位点指数平衡模型及液膜-孔两步扩散模型，结合量子化学密度泛函理论求解SBRMAER吸附HADPs相互作用基团及化学键结合能，以解析SBRMAER吸附HADPs普遍性及特异性传质动力学行为宏观演变内在规律和微观分子对接机制，丰富现有吸附动力学理论，为SBRMAER应用于回溶糖浆脱色提供科学依据。

In refined sugar production, the use of petroleum-based resin for remelt syrup decolorization is limited by food safety risks, non-renewability of raw materials (petroleum) for resin synthesis, and breakability of resin during utilization. In this work, we modify rosin into cross-linking matrices via conjugated double bonds and carboxyl groups. Functional groups (i.e., quaternary ammonia bases) are introduced via oriented polymerization to synthesize a strong base rosin-based macroporous anion exchange resin (SBRMAER) for the adsorption and removal of hexose alkaline degradation products (HADPs), which are the representative pigments of remelt syrup. The effects of HADP physicochemical properties on the structure–performance key-element orientation of SBRMAER and their underlying relationship are explored. Theoretical adsorption kinetic models under different forms of coordination, including a pseudo first-order/second-order combined model, a concentration driven–site index balancing model, and a liquid film–pore two step diffusion model, are proposed and established through system theory combination. The binding energy of interaction groups and chemical bonds during HADP adsorption by SBRMAER is solved by density functional theory. Furthermore, the universality and specificity of the inherent laws about the macroscopic evolution of mass transfer kinetic behaviors and the microscopic molecular docking mechanisms during HADP adsorption by SBRMAER are investigated. The findings will enrich adsorption kinetic theories and establish a scientific basis for the application of SBRMAER for remelt syrup decolorization.