水杨酸
化学
吸附
传质
扩散
洗脱
水溶液
水杨酸钠
色谱法
无机化学
热力学
有机化学
生物化学
物理
作者
Pengfei Jiao,Jiamiao Liu,Zhaoqi Wang,Maripat Ali,Luying Gu,Shanshan Gao
出处
期刊:ACS omega
[American Chemical Society]
日期:2022-10-10
卷期号:7 (41): 36679-36688
被引量:1
标识
DOI:10.1021/acsomega.2c04892
摘要
The mass-transfer process of salicylic acid on hyper-cross-linked resin XDA-200 was experimentally and theoretically studied. Undissociated salicylic acid was found to be the favorable form for salicylic acid adsorption on the resin. A pH-dependent adsorption isotherm model established in this paper could well fit the adsorption isotherm data at different pH values. Surface diffusion is the main mass-transfer mode for salicylic acid in resin particles. The salicylate anions and Na+ coadsorbed on the resin. The modified surface diffusion model considering the coadsorption was proposed. The model could satisfactorily fit the concentration decay curves of salicylic acid at different pH values and feed concentrations. NaOH aqueous solution at pH 12 could elute salicylic acid in the fixed bed efficiently. A pH-dependent dynamic adsorption and elution process model considering axial diffusion, external mass transfer, surface diffusion, pH-dependent adsorption equilibrium, as well as coadsorption of salicylate anions and Na+ was established. The model could well predict the breakthrough and elution curves at different feed concentrations. The research carried out in this paper has reference significance for optimizing the separation process of salicylic acid and its analogues.
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