大孔吸附树脂对大黄素吸附性能的研究

Study on the Adsorption Performance of Macroporous Adsorption Resin for Emodin

摘要: 通过研究大孔树脂对大黄素的吸附行为，为工业化分离大黄素提供一定的理论指导。采用静态吸附实验，研究不同大孔树脂对大黄素的吸附能力；选用较好吸附树脂考察其对大黄素的吸附热力学及动力学特性。H103树脂吸附能力优于其他4种大孔树脂，平衡吸附量为78 mg/g；通过分子对接吸附材料H103树脂主要结构与大黄素分子的芳香环间形成2个弱作用力π-π键，键长分别为2.9 Å、2.64 Å；Freundlich模型、Dubinin Radushkevich模型、Temkin模型能较好地模拟其等温吸附过程；吸附焓变ΔH > 0、吸附自由能ΔG < 0、吸附熵变ΔS > 0；吸附过程为自发的物理反应过程；大孔树脂对大黄素的吸附在130 min后达到平衡吸附过程符合伪一级动力学方程。H103大孔树脂可用于吸附大黄素；热力学和动力学研究结果为分离大黄素提供理论指导和科学依据。

Abstract: Studying the adsorption behavior of macroporous resin on emodin provides some theoretical guidance for the industrial separation of emodin. The static adsorption experiment was used to study the adsorption capacity of different macroporous resin, and to investigate the thermodynamic and kinetic characteristics of emodin. The adsorption capacity of H103 resin is better than the other four macroporous resin, and the equilibrium adsorption capacity is 78 mg/g; Two weak force π-π bonds are formed between the main structure of H103 resin and the aromatic ring of emodin molecule, and the bond lengths are 2.9 Å and 2.64 Å respectively; Freundlich model, Dubinin Radushkevich model and Temkin model can better simulate the isothermal adsorption process; the adsorption enthalpy is ΔH > 0, the adsorption free energy is ΔG < 0, and the adsorption entropy changes ΔS > 0; the adsorption process is a spontaneous physical reaction process; the adsorption of macroporous resin reaches the equilibrium adsorption process after 130 min conforms to the pseudo first-level kinetic equation. H103 macrohole resin can be used to absorb emodin; thermodynamic and kinetic study results provide theoretical guidance and scientific basis for separating emodin.