Robust dual-layer Janus membranes with the incorporation of polyphenol/Fe3+ complex for enhanced anti-oil fouling performance in membrane distillation

Lou, Mengmeng; Fang, Xiaofeng; Liu, Yanbiao; Chen, Gang; Zhou, Juan; Ma, Chunfeng; Wang, Huaping; Wu, Jian; Wang, Zhiwei; Li, Fang

doi:10.1016/j.desal.2021.115184

Cited by 34 publications

(11 citation statements)

References 55 publications

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“…17 Although scaling may be mitigated by superhydrophobic membranes via reducing the contact area and residual time for interfacial crystallization, superhydrophobic membranes are intrinsically oleophilic underwater and are thus vulnerable to oil and organic fouling. 18,19 With the contradicting requirements for scaling and fouling mitigation, achieving simultaneous mineral scaling and organic fouling resistance appears to be challenging.…”

Section: ■ Introductionmentioning

confidence: 99%

Nanocomposite Hydrogel Engineered Janus Membrane for Membrane Distillation with Robust Fouling, Wetting, and Scaling Resistance

Yang,

Zhang,

Zhang

et al. 2023

Environ. Sci. Technol.

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Membrane distillation (MD) is considered to be rather promising for high-salinity wastewater reclamation. However, its practical viability is seriously challenged by membrane wetting, fouling, and scaling issues arising from the complex components of hypersaline wastewater. It remains extremely difficult to overcome all three challenges at the same time. Herein, a nanocomposite hydrogel engineered Janus membrane has been facilely constructed for desired wetting/fouling/scaling-free properties, where a cellulose nanocrystal (CNC) composite hydrogel layer is formed in situ atop a microporous hydrophobic polytetrafluoroethylene (PTFE) substrate intermediated by an adhesive layer. By the synergies of the elevated membrane liquid entry pressure, inhibited surfactant diffusion, and highly hydratable surface imparted by the hydrogel/CNC (HC) layer, the resultant HC-PTFE membrane exhibits robust resistance to surfactantinduced wetting and oil fouling during 120 h of MD operation. Meanwhile, owing to the dense and hydroxyl-abundant surface, it is capable of mitigating gypsum scaling and scaling-induced wetting, resulting in a high normalized flux and low distillate conductivity at a concentration factor of 5.2. Importantly, the HC-PTFE membrane enables direct desalination of real hypersaline wastewater containing broad-spectrum foulants with stable vapor flux and robust salt rejection (99.90%) during long-term operation, demonstrating its great potential for wastewater management in industrial scenarios.

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Section: ■ Introductionmentioning

confidence: 99%

Nanocomposite Hydrogel Engineered Janus Membrane for Membrane Distillation with Robust Fouling, Wetting, and Scaling Resistance

Yang,

Zhang,

Zhang

et al. 2023

Environ. Sci. Technol.

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“…The reported TA-Fe 3+ coatings where the precise control on the nanostructure is usually hard to realize due to the fast and strong cross-linking effects between TA and Fe 3+ . − Here, the relatively weak interaction between Ca 2+ and TA contributed to the slower structure growth, providing the possibility to explore the structure-performance relationship for superwettable coatings with varied nanostructures. The TA-based coating layers were constructed on PK membranes using the LbL method by varying the TA concentration and number of LbL cycles to determine the optimal coating conditions.…”

Section: Results and Discussionmentioning

confidence: 99%

Nanostructural Manipulation of Polyphenol Coatings for Superwetting Membrane Surfaces

Jia

Guan

Zhang

et al. 2021

ACS Sustainable Chem. Eng.

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Functional coatings have gained significant attention in multiple environmental and energy-related research fields. One of the coatings with superwetting surfaces has received significant interest, owing to the favorable properties like self-cleaning and antifouling as well as the roles it plays in processes of water harvesting and oil–water separation. Hydrophilic polyphenol molecules show good adhesion to different substrates and provide multiple interactive sites, which serve as building blocks for the preparation of superwetting coatings. In this study, to realize the controlled formation of a polyphenol-based coating and to demonstrate the nanostructural dependence of its superwetting performance, tannic acid (TA) complexed with cations was employed to construct coating networks with either nanorough or nanosmooth surface morphology through a layer-by-layer (LbL) self-assembly method. Both nanostructures could be precisely controlled by adjusting the TA concentration and number of LbL cycles to observe the evolution of the wetting state of the coating. More importantly, while the nanosmooth and nanorough coatings exhibited similar surface chemistry, pore sizes, and superwetting properties, the separation efficiency for oil-in-water emulsions using the membrane with the nanorough coating is 2–5 and 2–10 times that of the one with a nanosmooth coating and the pristine one without a coating, respectively. The experimental results confirmed that the nanorough coating structure contributed to the superwetting state of the membrane surface and, therefore, possessed a stronger ability to repel oil than the nanosmooth coating during the separation process. This work demonstrates a novel strategy for the molecular self-assembly of polyphenols and may provide guidance for designing superwetting coatings.

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“…The membrane in the MD process must be nonwetted from the feed solution and must maintain its porous structure during operation to obtain the desired flux. , Thus, hydrophobic materials such as polypropylene (PP), – polyvinylidene fluoride (PVDF), – and polytetrafluoroethylene (PTFE) – have been widely used in MD processes. Membranes fabricated with these materials have intrinsic hydrophobicity, which can selectively permeate vapor and block the feed solution. – However, hydrophobicity inevitably causes fouling problems because of hydrophobic interactions with foulants such as lubricants or organic matter. , This oil fouling phenomenon reduces the separation performance and shortens the long-term usability. , …”

Section: Introductionmentioning

confidence: 99%

Facile Fabrication of Janus Membranes with Antifouling Properties for Membrane Distillation

Kim,

Park,

Choi

et al. 2023

ACS Appl. Polym. Mater.

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An antifouling Janus membrane for membrane distillation (MD) was fabricated via a facile photoinitiated chemical vapor deposition process. The hydrophilic polymer poly(2-hydroxyethyl methacrylate) (pHEMA) was selectively deposited on one side of the polytetrafluoroethylene membrane, while the other retained its hydrophobicity. The fabricated Janus membrane exhibited an overall maintained porous structure, owing to the advantages of vapor-phase polymer deposition; however, the asymmetric deposition of hydrophilic pHEMA on a single side of the membrane induced different properties on each side. The Janus properties were identified by using chemical analyses and contact angle measurements. The Janus membranes showed no significant differences in MD performance with a saline water feed compared with the pristine membrane. Moreover, in the MD test of the oil emulsion in saline water, the Janus membrane exhibited superior oil antifouling properties, whereas the pristine membrane was immediately fouled. Furthermore, the stability of the pHEMA-coated Janus membrane after MD testing was confirmed.

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Robust dual-layer Janus membranes with the incorporation of polyphenol/Fe3+ complex for enhanced anti-oil fouling performance in membrane distillation

Cited by 34 publications

References 55 publications

Nanocomposite Hydrogel Engineered Janus Membrane for Membrane Distillation with Robust Fouling, Wetting, and Scaling Resistance

Nanocomposite Hydrogel Engineered Janus Membrane for Membrane Distillation with Robust Fouling, Wetting, and Scaling Resistance

Nanostructural Manipulation of Polyphenol Coatings for Superwetting Membrane Surfaces

Facile Fabrication of Janus Membranes with Antifouling Properties for Membrane Distillation

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