期刊
CHEMICAL ENGINEERING JOURNAL
卷 231, 期 -, 页码 132-145出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2013.07.015
关键词
Salicylic acid; Molecularly imprinted membranes; Selectivity; Dynamic separation; Central composite design
资金
- National Natural Science Foundation of China [21077046, 21107037, 21176107, 21174057, 2100403, 21207051]
- National key basic research development program (973 Program) [2012CBB21500]
- Ph.D. Programs Foundation of Ministry of Education of China [20123227120015]
- Natural Science Foundation of Jiangsu Province [BK2011461, SBK2011459, BK2011514]
- China Postdoctoral Science Foundation [2012M511220, 2013M530240]
Highly selective molecularly imprinted membranes (MIM) for salicylic acid (SA) were synthesized with methacrylic acid (MAA), acrylamide (AM) or 4-vinylpyridine (4-VP) as the functional monomer, respectively based on the poly(vinylidene fluoride) microfiltration membrane. Fast kinetic equilibrium for the rebinding of SA was found on all the imprinted membranes. Comparing with MAA-MIM and AM-MIM, the 4-VP-MIM presented stronger adsorption capacity and higher permeation selectivity for SA due to the formation of ionic bond between SA and 4-VP. The separation effect on SA and acetylsalicylic acid (ASA) were strongly affected by the amount of polymer layers on the MIM. The experimental data were well fitted to a second-order polynomial equation using multiple regression analysis and also analyzed by analysis of variance (ANOVA). Response surface methodology was employed to investigate the best combination of separation conditions in the dynamic separation process. The optimal conditions for the separation of SA from ASA were as follows: the SA concentration of 10 mg L-1, the temperature of 10 degrees C and the flow rate of 1 mL min(-1). Under these conditions, the experimental separation factor of SA and ASA was 10.24 +/- 1.06%, which was close to the predicted separation factor. (C) 2013 Elsevier B.V. All rights reserved.
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