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Park, Kwang Hyun
원자제어 저차원 전자계 연구단
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Polyvinylidene fluoride phase design by two-dimensional boron nitride enables enhanced performance and stability for seawater desalination

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Title
Polyvinylidene fluoride phase design by two-dimensional boron nitride enables enhanced performance and stability for seawater desalination
Author(s)
Lee, Dongju; Woo, Yun Chul; Kwang Hyun Park; Phuntsho, Sherub; Tijing, Leonard D.; Yao, Minwei; Shim, Wang-Geun; Shon, Ho Kyong
Subject
Boron nitride nanosheet, ; Desalination, ; Electrospinning, ; Polyvinylidene fluoride
Publication Date
2020-03
Journal
JOURNAL OF MEMBRANE SCIENCE, v.598, pp.117669
Publisher
ELSEVIER SCIENCE BV
Abstract
© 2019 Elsevier B.V. The instability of polyvinylidene fluoride (PVDF) membranes in membrane distillation (MD) for seawater desalination is still a problem, despite the tremendous effort expended to resolve this issue. Here, a simple and feasible approach for improving desalination performance through the incorporation of two-dimensional boron nitride nanosheets (BNNSs) in polyvinylidene fluoride-co-hexafluoropropene (PVDF-co-HFP) electrospun nanofiber membrane (BNs-PH) is proposed as well as demonstrate its origin for fundamental understanding. The BNs-PH membrane exhibits a stable water vapor flux (18 LMH) and superior salt rejection (99.99%), even after operation for 280 h (commercial PVDF: steep decay within 28 h; neat PH: wetting within 4 h). From structural/chemical analyses, the BNNSs play a crucial role in forming favorable phases of the PH polymer crystal structure, inducing a superhydrophobic surface with greater nanoporosity and higher heterogeneity as well as enhanced mechanical properties (increase of UTS: 13.4%; modulus: 1.2%) for long-term operation. Theoretical modeling results of an air-gap MD system are consistent with our experimental results. The approach introduced in this study can be applied to other desalination systems to boost various water treatment applications
URI
https://pr.ibs.re.kr/handle/8788114/8357
DOI
10.1016/j.memsci.2019.117669
ISSN
0376-7388
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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