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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

Postal Subscription Code 80-973

2018 Impact Factor: 3.883

Front. Environ. Sci. Eng.    2022, Vol. 16 Issue (12) : 153    https://doi.org/10.1007/s11783-022-1588-6
RESEARCH ARTICLE
Functional flax fiber with UV-induced switchable wettability for multipurpose oil-water separation
Xiujuan Chen1,2, Yunqiu Liu2, Gordon Huang3(), Chunjiang An4, Renfei Feng5, Yao Yao3, Wendy Huang1, Shuqing Weng6
1. Department of Civil Engineering, University of Calgary, Calgary Alberta T2N 1N4, Canada
2. Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina Saskatchewan S4S 0A2, Canada
3. Environmental Systems Engineering, University of Regina, Regina Saskatchewan S4S 0A2, Canada
4. Department of Building, Civil and Environmental Engineering, Concordia University, Montreal Quebec H3G 1M8, Canada
5. Canadian Light Source, Saskatoon SK S7N 2V3, Canada
6. McElhanney Inc, Cranbrook British Columbia V1C 7H9, Canada
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Abstract

● A PAA-ZnO-HDTMS flax fiber with UV-induced switchable wettability was developed.

● The property of flax fiber could be switched from hydrophobicity to hydrophilicity.

● The mechanism of the acquired UV-induced switchable wettability was discussed.

● The developed flax fiber was successfully used for multipurpose oil-water separation.

The large number of oily wastewater discharges and oil spills are bringing about severe threats to environment and human health. Corresponding to this challenge, a functional PAA-ZnO-HDTMS flax fiber with UV-induced switchable wettability was developed for efficient oil-water separation in this study. The developed flax fiber was obtained through PAA grafted polymerization and then ZnO-HDTMS nanocomposite immobilization. The as-prepared PAA-ZnO-HDTMS flax fiber was hydrophobic initially and could be switched to hydrophilic through UV irradiation. Its hydrophobicity could be easily recovered through being stored in dark environment for several days. To optimize the performance of the PAA-ZnO-HDTMS flax fiber, the effects of ZnO and HDTMS concentrations on its switchable wettability were investigated. The optimized PAA-ZnO-HDTMS flax fiber had a large water contact angle (~130°) in air and an extremely small oil contact angle (~0°) underwater initially. After UV treatment, the water contact angle was decreased to 30°, while the underwater oil contact angle was increased to more than 150°. Based on this UV-induced switchable wettability, the developed PAA-ZnO-HDTMS flax fiber was applied to remove oil from immiscible oil-water mixtures and oil-in-water emulsion with great reusability for multiple cycles. Thus, the developed flax fiber could be further fabricated into oil barrier or oil sorbent for oil-water separation, which could be an environmentally-friendly alternative in oil spill response and oily wastewater treatment.

Keywords Flax fiber      Switchable wettability      ZnO-HDTMS coating      Oil-water separation     
Corresponding Author(s): Gordon Huang   
Issue Date: 15 June 2022
 Cite this article:   
Xiujuan Chen,Yunqiu Liu,Gordon Huang, et al. Functional flax fiber with UV-induced switchable wettability for multipurpose oil-water separation[J]. Front. Environ. Sci. Eng., 2022, 16(12): 153.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-022-1588-6
https://academic.hep.com.cn/fese/EN/Y2022/V16/I12/153
Fig.1  Process flow diagram of the fabrication for PAA-ZnO-HDTMS flax fiber.
HDTMS concentration (vol%) Nano-ZnO concentration (wt%) Initial water contact angle (° ) UV exposure time (min)
0.05 0.1 112.63 160
0.5 97.40 20
1.0 96.20 40
2.0 103.35 30
0.10 0.1 123.50 > 180
0.5 103.98 70
1.0 111.86 40
2.0 112.60 60
0.20 0.1 124.00 > 180
0.5 109.01 140
1.0 114.26 60
2.0 114.66 60
0.40 0.1 128.96 > 180
0.5 127.05 > 180
1.0 127.05 90
2.0 129.91 100
Tab.1  Initial water contact angles of the PAA-ZnO-HDTMS flax fibers and UV exposure time to switch wettability
Fig.2  (a and b) Initial water contact angles of the fresh PAA-ZnO-HDTMS flax fibers under different combinations of HDTMS and nano-ZnO concentrations, and (c) surface hydrophobicity recovery of the UV-treated PAA-ZnO-HDTMS flax fiber after stored in dark environment.
Fig.3  SEM images and EDX results of the original flax fiber (a, b), fresh PAA-ZnO-HDTMS flax fiber (c, d), and UV-treated PAA-ZnO-HDTMS flax fiber (e, f).
Fig.4  (a) Synchrotron-based XRF spectra on flax fiber surfaces, and Zn concentration distributions on the surfaces of: (b) the original flax fiber, (c) the fresh PAA-ZnO-HDTMS flax fiber, and (d) the UV-treated PAA-ZnO-HDTMS flax fiber.
Fig.5  (a) Synchrotron-based FTIR spectra of PAA-ZnO-HDTMS flax fibers; Synchrotron-based FTIR images of PAA-ZnO-HDTMS flax fiber for –CH2– (b, c) and –CH3 (d, e) before and after UV treatment.
Fig.6  Nanostructure on the PAA-ZnO-HDTMS flax fiber surface and the mechanism of the UV-induced switchable wettability.
Fig.7  The performances of (a) fresh PAA-ZnO-HDTMS flax fiber as oil filter for the separation of immiscible heavy oil-water mixture, and (b) UV-treated PAA-ZnO-HDTMS flax fiber as oil barrier for the separation of immiscible light oil-water mixture and (c) the corresponding cycling tests.
Fig.8  The performances of the fresh PAA-ZnO-HDTMS flax fiber as oil sorbent to separate oil and water from immiscible mixtures containing (a) light oil and (b) heavy oil, and (c) oil-in-water emulsion and (d) the corresponding cycling tests.
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