Preparation of composite‐imprinted alumina membrane for effective separation of p‐hydroxybenzonic acid from its isomer using Box–Behnken design–based statistical modeling. Issue 16 (13th March 2014)

• Record Type: Journal Article
• Authors: Meng, Minjia; Feng, Yonghai; Liu, Yan; Wang, Yun; Yan, Yongsheng
• Is Part Of: Journal of applied polymer science. Volume 131:Issue 16(2014:Aug. 15)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2014-03-13
• Subjects: Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.40621
• Languages: English
• ISSNs: 0021-8995

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p>Highly selective composite imprinted membrane for <italic>p</italic>‐hydroxybenzonic acid (<italic>p</italic>‐HB) was prepared by using semicovalent imprinting technique. A thermally reversible covalent bond was used to link <italic>p</italic>‐HB molecule to a functional alkoxysilane monomer to generate covalently bound imprint precursor. This precursor was incorporated into a cross‐linked functional silica sol with the tetraethoxysilane as cross‐linker via a typical acid‐catalyzed, sol‐gel synthesis. Then, the SCIM was prepared through dipping and grafting on the upper side and inner pores of the Al<sub>2</sub>O<sub>3</sub> microporous membrane and then removing of the template molecule after thermal treatment. Compared with composite imprinted membrane via noncovalent imprinting approach as well as the black Al<sub>2</sub>O<sub>3</sub> microporous membrane, the SCIM exhibited higher membrane flux and selective rebinding of <italic>p</italic>‐HB as well as showing excellent permeability for <italic>p</italic>‐HB. Response surface methodology was used to investigate the best combination of separation conditions in the dynamic separation process. The optimal conditions for the separation of <italic>p</italic>‐HB from salicylic acid were as follows: the <italic>p</italic>‐HB concentration of 5 mg L<sup>−1</sup>, the temperature of 10°C, and the flow rate of 1 mL min<sup>−1</sup>. Under these conditions, the experimental selective separation factor was 32.75 ± 0.91%, which was close to the predicted selectivity coefficient value. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. <bold>2014</bold>, <italic>131</italic>, 40621.</p> </abstract>