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Polyimide/cellulose acetate core/shell electrospun fibrous membranes for oil-water separation

Ma, Wenjing and Guo, Zhongfu and Zhao, Juntao and Yu, Qian and Wang, Fang and Han, Jingquan and Pan, Hui and Yao, Jianfeng and Zhang, Qilu and Samal, Sangram Keshari and De Smedt, Stefaan C and Huang, Chaobo (2017) Polyimide/cellulose acetate core/shell electrospun fibrous membranes for oil-water separation. In: SEPARATION AND PURIFICATION TECHNOLOGY, 177 . pp. 71-85.

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Official URL: http://dx.doi.org/10.1016/j.seppur.2016.12.032

Abstract

In recent years, efficient, cost effective oil-water separation technologies are highly desired due to frequent oil spill accidents. To design fibrous membranes for efficient oil-water separation, `flexible' polyamide acid (PAA), being polyamide acid with ether linkages in the backbone, and `heavily' fluorinated polybenzoxazine (F-PB) were synthesized. Cellulose acetate (CA) and PM were co-axially electrospun; the PAA core was then imidizated at high temperature to obtain core/shell structured CA/polyimide (PI) electrospun fibrous membranes; subsequently the surface of the fibers was modified with F-PB, in the presence or in absence of silica nanoparticles (SNPs). The mechanical strength, surface wettability, chemical and thermal stability, and oil-water separation potential of thus obtained PI/CA fibrous membranes were evaluated. The membranes show a much higher critical tensile stress (130 MPa) and critical tensile strain (52%), when compared with CA fibrous membranes. Due to the use of the `heavily' fluorinated polybenzoxazine, the membranes are superhydrophobic with a water contact angle of 162 degrees and an oil contact angle which approaches 0 degrees. Interestingly, the newly designed PI/CA/F-PB-1/SNP-4 membranes can effectively separate various oil-water mixtures, solely driven by gravity, with a high flux (3106.2 +/- 100 L m(-2) h(-1)) and a high separation efficiency (>99%) and thus possess great potential for oil-water separation. (C) 2016 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Depositing User: Id for Latest eprints
Date Deposited: 15 Mar 2017 04:21
Last Modified: 15 Mar 2017 04:21
URI: http://eprints.iisc.ac.in/id/eprint/56374

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