大孔吸附樹脂吸附分離理論新進展
近日，由中國科學院蘭州化學物理研究所中科院西北特色植物資源化學重點實驗室邸多隆研究員帶領的課題組，在大孔吸附樹脂對天然產物中黃酮類化合物選擇性吸附機理研究方面取得新進展。
大孔吸附樹脂對蘆丁的吸附等溫線
該研究以苯乙烯—二乙烯基苯系大孔吸附樹脂為研究對象，通過研究大孔吸附樹脂對蘆丁的吸附行為，發現其吸附行為更適合于Brunauer提出的第四種模型。研究結果驗證了大孔吸附樹脂的吸附依其吸附過程依次存在著大孔、中孔和小孔三個階段的假設，并發現在每兩個階段的交替過程會出現毛細管效應。進一步的研究表明，大孔吸附樹脂吸附作用力主要源于其內壁作用位點上的剩余價鍵力，剩余價鍵力的誘導作用隨傳遞層數的增加而快速衰減，在傳遞過三層后基本消失。該研究結果對大孔吸附樹脂吸附分離理論的更深入研究具有一定的意義。
該項工作得到了國家自然科學基金，中科院“百人計劃”項目的基金資助。
Study on the Adsorption Feature of Rutin Aqueous Solution on Macroporous
Adsorption Resins
Zhenbin Chen 1,2,3, Anjie Zhang 2,3, Jie Li 2,3, Fang Dong 2,3, Duolong Di1 and Youzhi Wu 2,3
1 Chinese Academy of Sciences.
2 State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology.
3 School of Material Science and Engineering, Lanzhou University of Technology.
Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000 Gansu, China, State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou, 730050 Gansu, China, and School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050 Gansu, China.
【Abstract】The adsorption feature of different kinds of polystyrene-based macroporous adsorption resins (MARs) was investigated systemically at constant temperature employing Rutin as the adsorbate. Different from traditional adsorption patterns, Langmuir and Freundlich adsorption, and the results showed interesting aspects: (1) With the increase of the volume of the initial solution, the adsorption capacity increased to the maximum, and then decreased gradually.
(2) Experimental results clearly verified the opinion that the adsorption process of MARs could be divided into three stages—macropores, mesopores, and micropores—by the capillary effects occurring at the two intersections, and the adsorption feature for every stage could be described well by the fourth type of Brunauer model.
(3) The model that the inductive effect transmitted to the first layer could not interpret our experimental results reasonably. Thus, the model that the inductive effect passed on to a higher layer was proposed by investigating regression of the experimental results and the conclusion that the inductive effect transmitted to the third layer was drawn.
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