Superhydrophilic membranes produced by biomimetic mineralization for water treatment
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Superhydrophilic membranes produced by biomimetic mineralization for water treatment Huiju Shao1, Jifeng Cheng1, Dongdong Kang1, and Shuhao Qin1,* 1
National Engineering Research Center for Compounding and Modification of Polymer Materials, Guiyang 550014, China
Received: 20 July 2020
ABSTRACT
Accepted: 8 September 2020
Poly(vinylidene fluoride) (PVDF) membrane has been applied in the diverse water treatments, but its inherent hydrophobicity must be adjusted to reduce energy consumption. Herein, high hydrophobicity of PVDF membrane surface was transformed to superhydrophilicity by the combination of mussel-inspired chemistry and biomimetic mineralization. The deposited tannic acid (TA) and polyethylenimine (PEI) induced in situ biomimetic mineralization to form nanosphere and nanowire microstructures on the membrane surface. The highly efficient separation and outstanding antifouling properties were achieved for oil-in-water emulsion and dyeing wastewater treatment. The rejections of nanoZrO2/PEI-TA/PVDF membranes to BSA, oil, Congo red and methyl blue reached as high as 99.3%, 98.8%, 96.8% and 93.5% (15-fold increment compared to that of pristine membrane), respectively. With rejections to BSA (95.0%), oil (93.9%), Congo red (86.6%) and methyl blue (83.2%), the permeate flux of nanoTiO2/PEI-TA/PVDF membranes reached as high as 1312.6 L/m2 h, showing nearly 7.6-fold increment compared with other reported values. This work developed a novel strategy to fabricate multifunctional separation membranes for environmental remediation.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Christopher Blanford.
Address correspondence to E-mail: [email protected]
https://doi.org/10.1007/s10853-020-05316-9
J Mater Sci
GRAPHIC ABSTRACT A superhydrophilic membrane with multiple hierarchical structures was fabricated through the combination of mussel-inspired chemistry and biomimetic mineralization to treat dyeing wastewater and oil emulsions highly efficiently.
Introduction Due to the global water pollution and water crisis, membrane technology has attracted great attention in recent years. Advanced membrane technologies with many merits, such as high separation efficiency and low energy consumption, have greatly mitigated the global aggravating water crisis by purifying the waste water sustainably [1–3]. Therein, many polymers are usually applied in the production of porous membranes to remedy various water [4]. Poly(vinylidene fluoride) (PVDF), one of the most popular polymeric membrane materials, has attracted growing attention owing to its outstanding chemical resistance and mechanical properties [5–7]. However, PVDF membrane is typically hydrophobic due to the inherent characteristics of fabricating separation membrane by the phase separation process. Thus, it easily suffers from pollutant attacks, resulting in undesirable life span and increased energy consumption [8–10]. Theoretically, surface hydrophilization of membranes is highly efficient for enhancing antifouling propert
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