TY - JOUR
T1 - Superhydrophobic polymer membrane coated by mineralized β-FeOOH nanorods for direct contact membrane distillation
AU - Li, Bang
AU - Yun, Yanbin
AU - Wang, Manxiang
AU - Li, Chunli
AU - Yang, Woochul
AU - Li, Jingwei
AU - Liu, Guicheng
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/3/15
Y1 - 2021/3/15
N2 - Membrane wetting and fouling represent the foremost concerning issues confining membrane distillation in the treatment of industrial wastewater. This work presents a superhydrophobic poly(vinylidene fluoride) (PVDF) membrane with anti-fouling property, which was derived from the bioinspired adhesive, mineralization and fluorination process for the direct contact membrane distillation (DCMD). The synthesis of membrane was initiated by co-depositing polydopamine/polyethylenimine composite layer onto membrane substrates as “bio-glue” associated with β-FeOOH nanorods as hierarchical structure anchoring to form coordination complexes via the catechol group and Fe3+, then proceeded with the fluorination of 1H,1H,2H,2H-perfluorodecyltriethoxysilane to obtain the superhydrophobic PVDF membrane. Due to the unique micro-nano structure obtained, the resulting PVDF membrane, with a low sliding angle of 5.7° and a high water contact angle of 162°, conforms to the Cassie state. The membrane morphology, wetting behaviour, and anti-fouling performance were systematically characterized. The novel mineralized superhydrophobic membrane exhibited a steady flux and an outstanding salt rejection (99.9%) in treating high salinity and hardness containing-wastewater during 60-h-DCMD test, thus showing great potential for practical application in long-term DCMD.
AB - Membrane wetting and fouling represent the foremost concerning issues confining membrane distillation in the treatment of industrial wastewater. This work presents a superhydrophobic poly(vinylidene fluoride) (PVDF) membrane with anti-fouling property, which was derived from the bioinspired adhesive, mineralization and fluorination process for the direct contact membrane distillation (DCMD). The synthesis of membrane was initiated by co-depositing polydopamine/polyethylenimine composite layer onto membrane substrates as “bio-glue” associated with β-FeOOH nanorods as hierarchical structure anchoring to form coordination complexes via the catechol group and Fe3+, then proceeded with the fluorination of 1H,1H,2H,2H-perfluorodecyltriethoxysilane to obtain the superhydrophobic PVDF membrane. Due to the unique micro-nano structure obtained, the resulting PVDF membrane, with a low sliding angle of 5.7° and a high water contact angle of 162°, conforms to the Cassie state. The membrane morphology, wetting behaviour, and anti-fouling performance were systematically characterized. The novel mineralized superhydrophobic membrane exhibited a steady flux and an outstanding salt rejection (99.9%) in treating high salinity and hardness containing-wastewater during 60-h-DCMD test, thus showing great potential for practical application in long-term DCMD.
KW - Anti-fouling polymer membrane
KW - Direct contact membrane distillation
KW - Micro-nano structure
KW - Superhydrophobic surface
KW - β-FeOOH Nanorods
UR - http://www.scopus.com/inward/record.url?scp=85097657623&partnerID=8YFLogxK
U2 - 10.1016/j.desal.2020.114889
DO - 10.1016/j.desal.2020.114889
M3 - Article
AN - SCOPUS:85097657623
SN - 0011-9164
VL - 500
JO - Desalination
JF - Desalination
M1 - 114889
ER -