An environmentally-friendly enzyme-based nanofibrous membrane for 3,3′,5,5′-tetrabromobisphenol removal

Ran Xu; Rongzhi Tang; Sijia Liu; Fengting Li; Bingru Zhang

doi:10.1039/C5RA09090C

An environmentally-friendly enzyme-based nanofibrous membrane for 3,3′,5,5′-tetrabromobisphenol removal

Ran Xu,*^a Rongzhi Tang,^a Sijia Liu,^a Fengting Li^a and Bingru Zhang^a

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* Corresponding authors

^a State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China
E-mail: carol.xuran@tongji.edu.cn
Fax: +86 21 65986313
Tel: +86 21 65980567

Abstract

Chitosan (CS)/poly(vinyl alcohol) (PVA) nanofibrous membranes have inherently poor mechanical strength. To improve the mechanical strength of these membranes, nanocrystalline cellulose (NCC) prepared by a simplified method was added to the former system. The results showed that the tensile strength of the membrane with 5% NCC addition was 370% higher than that of the membrane without NCC. Horseradish peroxidase (HRP) was immobilized on the membrane through covalent binding with HRP previously activated with 1,1′-carbonyldiimidazole, and the maximum enzyme loading was approximately 384 mg g⁻¹. The physical, chemical properties of immobilized HRP and its application in 3,3′,5,5′-tetrabromobisphenol (TBBPA) removal were examined. The results showed that HRP immobilized on CS/PVA–NCC membranes showed greater stability and reusability than free HRP and the membrane without NCC. The former also exhibited an effective performance (95.9% removal, 3 h) for TBBPA removal under the optimum conditions (pH 7, 35 °C). The results showed that HRP immobilized on NCC-incorporated CS/PVA membranes could be used to remove brominated flame-retardants, especially TBBPA from wastewater. Thus, these membranes have potential industrial applications.

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The article was received on 15 May 2015, accepted on 21 Jul 2015 and first published on 21 Jul 2015

Article type: Paper

DOI: 10.1039/C5RA09090C

Author version available: Download Author version (PDF)

Citation: RSC Adv., 2015,5, 64091-64097

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An environmentally-friendly enzyme-based nanofibrous membrane for 3,3′,5,5′-tetrabromobisphenol removal

R. Xu, R. Tang, S. Liu, F. Li and B. Zhang, RSC Adv., 2015, 5, 64091
DOI: 10.1039/C5RA09090C
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An environmentally-friendly enzyme-based nanofibrous membrane for 3,3′,5,5′-tetrabromobisphenol removal

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An environmentally-friendly enzyme-based nanofibrous membrane for 3,3′,5,5′-tetrabromobisphenol removal

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