Abstract To explore the mechanism of adsorbates onto selected resin and provide a theoretical basis for the reduction of acidity in hawthorn fruit juice. In this study, the adsorption processes of titratable acidity (TA) and total flavonoids (TF) from hawthorn fruit juice onto macro-porous adsorption resins were studied. The experimental data were fitted by two widely used isotherm models namely, Langmuir and Freundlich. Kinetics of the adsorption processes were fitted by Pseudo-first-order, Pseudo-second-order kinetics, Elovich kinetics and Web and Morris intra-particle diffusion model. The experiment data showed D315 resin exhibited the highest adsorption capacity, Qe = 176.28 mg/mL, and selectivity coefficient, α = 3.588. The results also showed that the adsorption of adsorbates on D315 resin correlated better with the Langmuir isotherm model. The adsorption processes of adsorbates were better fitted by pseudo-second-order kinetics. In addition, the adsorption process of TA and TF on D315 resin is chemical adsorption, spontaneous and endothermic. The results indicated that D315 resin had a good adsorption effect on TA in hawthorn fruit juice and provided the theoretical basis for further exploration.

中文翻译：

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山楂汁中酸和黄酮类化合物同时吸附到树脂上

摘要 探讨吸附物在选定树脂上的吸附机理，为降低山楂果汁酸度提供理论依据。本研究研究了山楂果汁中可滴定酸度（TA）和总黄酮（TF）在大孔吸附树脂上的吸附过程。实验数据由两种广泛使用的等温线模型拟合，即 Langmuir 和 Freundlich。吸附过程的动力学通过伪一级动力学、伪二级动力学、Elovich 动力学以及 Web 和 Morris 颗粒内扩散模型拟合。实验数据表明，D315 树脂的吸附容量最高，Qe = 176.28 mg/mL，选择性系数α = 3.588。结果还表明，吸附物在 D315 树脂上的吸附与朗缪尔等温线模型的相关性更好。被吸附物的吸附过程更符合拟二级动力学。此外，TA和TF在D315树脂上的吸附过程为化学吸附，自发吸热。结果表明，D315树脂对山楂果汁中的TA具有良好的吸附作用，为进一步探索提供了理论依据。