A dual-biomimetic strategy to construct zwitterionic anti-fouling membrane with superior emulsion separation performance

Zhang, Na; Cheng, Kai; Zhang, Jiaojiao; Li, Nan; Yang, Xin; Wang, Zhining

doi:10.1016/j.memsci.2022.120829

Cited by 34 publications

(21 citation statements)

References 47 publications

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“…For the PTFE membrane, the characteristic peaks at 1202 and 1147 cm –1 are caused by the asymmetric and symmetric stretching vibration of the C–F–C bond, respectively . After PDA/PEI modification, a characteristic peak at 1610 cm –1 was observed attributed to aromatic CC . Apparently, a broad and strong absorption peak at 3276 cm –1 appeared on the spectrum of the PVA-PTFE membrane, which is attributed to the −OH stretching of PVA .…”

Section: Resultsmentioning

confidence: 97%

“…24 After PDA/PEI modification, a characteristic peak at 1610 cm −1 was observed attributed to aromatic C�C. 41 Apparently, a broad and strong absorption peak at 3276 cm −1 appeared on the spectrum of the PVA-PTFE membrane, which is attributed to the −OH stretching of PVA. 42 Besides, the peaks at 2940 and 1417 cm −1 correspond to the stretching vibration of the −CH 2 group and the C−C bond in the PVA layer.…”

Section: Resultsmentioning

confidence: 99%

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Janus Membrane with Hydrogel-like Coating for Robust Fouling and Wetting Resistance in Membrane Distillation

Zhang

Yang

et al. 2023

ACS Appl. Mater. Interfaces

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Membrane distillation (MD) is a promising technique for water reclamation from hypersaline wastewater. However, fouling and wetting of the hydrophobic membranes are two prominent challenges for the widespread application of MD. Herein, we developed an antiwetting and antifouling Janus membrane comprising a hydrogel-like polyvinyl alcohol/tannic acid (PVA/TA) top layer and a hydrophobic polytetrafluoroethylene (PTFE) membrane substrate via a facile and benign strategy combining mussel-amine co-deposition with the shrinkage−rehydration process. Interestingly, the vapor flux of the Janus membrane was not compromised, though a microscale PVA/ TA layer was introduced, possibly due to the high water uptake and reduced water evaporation enthalpy of the hydrogel-like structure. Moreover, the PVA/TA-PTFE Janus membrane sustained stable MD performance while treating a challenging saline feed containing surfactants and mineral oils. The robust wetting resistance arises from the synergistic effects of the elevated liquid entry pressure (1.01 ± 0.02 MPa) of the membrane and the retardation of surfactant transport to the substrate PTFE layer. Meanwhile, the hydrogel-like PVA/TA layer hinders oil fouling due to its strongly hydrated state. Furthermore, the PVA/TA-PTFE membrane exhibited improved performance in purifying shale gas wastewater and landfill leachate. This study provides new insights into the facile design and fabrication of promising MD membranes for hypersaline wastewater treatment.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Janus Membrane with Hydrogel-like Coating for Robust Fouling and Wetting Resistance in Membrane Distillation

Zhang

Yang

et al. 2023

ACS Appl. Mater. Interfaces

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“…Hydrophobic methylene groups (−CH 2 −) between the cationic and anionic moieties govern the ratio of hydrophobicity/hydrophilicity and thus the fouling resistance of a zwitterionic polymer. , Previous studies demonstrated that shortening the length of the methylene groups effectively enhances the hydrophilicity and antifouling property of the zwitterionic polymers. , For instance, in the absence of the methylene groups where the anionic oxygen group connects directly to the cationic quaternary amine group, the corresponding headgroup (i.e., N -oxide) exhibits superior hydrophilicity through forming strong hydrogen bonds with multiple water molecules. , This hydrophilic property enables stabilization of proteins in the skin of saltwater fish, in which a representive N -oxide molecule-trimethylamine N -oxide (TMAO) plays a major role . As such, N -oxide-based zwitterionic polymers are of particular interest as a new class of fouling-resistant materials for environmental applications. , …”

Section: Introductionmentioning

confidence: 99%

“…28 As such, N-oxide-based zwitterionic polymers are of particular interest as a new class of fouling-resistant materials for environmental applications. 29,30 In this study, we exploit a N-oxide-base moiety to construct fouling-resistant surfaces for environmental applications. A polymerizable analogue of trimethylamine N-oxide (TMAO) is synthesized by the oxidation of a tertiary amine-bearing methacrylamide.…”

Section: ■ Introductionmentioning

confidence: 99%

Bioinspired N-Oxide-Based Zwitterionic Polymer Brushes for Robust Fouling-Resistant Surfaces

Feng

2023

Environ. Sci. Technol.

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Fouling-resistant surfaces are needed for various environmental applications. Inspired by superhydrophilic N-oxide-based osmolytes in saltwater fish, we demonstrate the use of a trimethylamine N-oxide (TMAO) analogue for constructing fouling-resistant surfaces. The readily synthesized N-oxide monomer of methacrylamide is grafted to filtration membrane surfaces by surface-initiated atom transfer radical polymerization (SI-ATRP). Successful grafting of the amine N-oxide brush layer as confirmed by material characterization endows the surface with increased hydrophilicity, reduced charge, and decreased roughness. Notably, the introduction of the N-oxide layer does not compromise transport properties, i.e., water permeability and water-salt selectivity. Moreover, the modified membrane exhibits improved antifouling properties with a lower flux decline (32.1%) and greater fouling reversibility (18.55%) than the control sample (45.4% flux decline and 3.26% fouling reversibility). We further evaluate foulant–membrane interaction using surface plasmon resonance (SPR) to relate the reduced fouling tendency to the synergic effects of surface characteristic changes after amine N-oxide modification. Our results demonstrate the promise and potential of the N-oxide-based polymer brushes for the design of fouling resistance surfaces for a variety of emerging environmental applications.

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“…To address this practical challenge, a wide variety of techniques have been adopted for oil/water separation, including skimmer, air flotation, in-situ burning and coagulation, with satisfactory results for immiscible oil/water mixtures (Han et al 2019;Kong et al 2023;Li et al 2021b;Zhang et al 2023) . However, for surfactant-stabilized oil-water emulsions with small droplet sizes (<20 µm), these technologies suffer from dramatic decline of separation rates, high energy consumption, and failure in complex environments (Wang et al 2021c;Zhang et al 2022b). Relative to the above-mentioned traditional process, membrane separation technology has been identified as one of the most effective and promising methods for oil-water emulsion purification with the advantages of straightforward process, high separation efficiency and low cost (Guo et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Easy preparation of wood-base membrane with fouling resistance in complex environments for efficient oil-water emulsion separation

Zhang

Teng

Zhai

et al. 2023

Preprint

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Oily wastewater poses a serious threat to the ecological environment and human health, and there is a great deal of concern about how to treat it effectively. Although there has been considerable development in recent years in the treatment of oil-water emulsions using separation membranes with special wettability, they still suffer from real problems such as complex preparation processes, material contamination, so developing an economical and environmentally friendly, high-performance membrane is a significant challenge. In this work, a wood-based membrane was easily prepared by a simple dipping process using aramid nanofiber (ANF) to modify the surface of wood. The wet ANF/wood membrane reveals higher tensile strength (1.69±0.32 MPa) than synthetic hydrogel membranes. More importantly, the membrane presents the underwater superoleophobic properties and fouling resistance under complex environmental conditions (acid, alkali, seawater, and high temperature), and effectively separate various oil-water emulsions with high separation efficiency (>99.3%) and flux (>227 L m-2 h-1). More excitingly, the membrane remains the original separation properties after 13 cycles of oil-water emulsion separation, Therefore, the inexpensive, environmentally friendly and easily prepared ANF/wood membrane is well tolerated under extreme conditions, presents excellent separation performances and provides a material basis for the treatment of actual oily wastewater.

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A dual-biomimetic strategy to construct zwitterionic anti-fouling membrane with superior emulsion separation performance

Cited by 34 publications

References 47 publications

Janus Membrane with Hydrogel-like Coating for Robust Fouling and Wetting Resistance in Membrane Distillation

Janus Membrane with Hydrogel-like Coating for Robust Fouling and Wetting Resistance in Membrane Distillation

Bioinspired N-Oxide-Based Zwitterionic Polymer Brushes for Robust Fouling-Resistant Surfaces

Easy preparation of wood-base membrane with fouling resistance in complex environments for efficient oil-water emulsion separation

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