Superhydrophilic alkynyl carbon composite nanofiltration membrane for water purification

Zhao, Guangjin; Wang, Xueming; Li, Chunxi; Meng, Hong

doi:10.1016/j.apsusc.2019.144788

Cited by 18 publications

(4 citation statements)

References 50 publications

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“…The decorated particles are usually used for producing the metal/particle composition by the co-deposition approach, which has been widely used in the field of material modification. − Celis et al found that the particles were first surrounded by ionic clouds and then driven by the electrophoresis force toward the cathode surface, adsorbed on it, and finally buried by the metal atoms produced by electrodeposition. In later decades, researchers found that the ionic clouds around the particles can be achieved by decorating surfactants on the surface of the particles. − Kılıç et al used a cation surfactant, named, CTAB, to decorate the surface of the SiC particles.…”

Section: Introductionmentioning

confidence: 99%

Surface Decoration of Cetyltrimethyl Ammonium Bromide on SiC Particles and Its Effects on the Co-Deposition Process

Wang

et al. 2021

J. Phys. Chem. B

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Cetyltrimethyl ammonium bromide (CTAB) is used to decorate the SiC particle surface. The mechanism of the decoration process has been studied by simulation and experimental approaches. Molecular dynamics (MD) simulation finds a bilayer adsorbed structure of CTAB on the SiC particles, which is then verified by Fourier-transform infrared and thermal gravimetric analysis measurements. The MD simulation also finds that the decorative effects of CTAB on the SiC particle surface are related to the surface charge condition of the SiC particles and the concentration of CTAB. The measured zeta potential of the SiC particles shows dependence on the pH condition and the concentration of CTAB. The decorated SiC particles are used to produce composition by the co-deposition technology. With the help of CTAB, SiC particles are successfully incorporated in the deposited layer, where the content of SiC particles is dependent on the concentration of CTAB and the pH of the bath.

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Section: Introductionmentioning

confidence: 99%

Surface Decoration of Cetyltrimethyl Ammonium Bromide on SiC Particles and Its Effects on the Co-Deposition Process

Wang

et al. 2021

J. Phys. Chem. B

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“…However, an appreciably lower water permeance of 5.2 LMH bar –1 (Figure f) was obtained owing to the hydrophobic character of TAPP-ETTB COF (Figure d). A comparative analysis of the MB rejection performance of the TUS-46 and TAPP-ETTB COF membranes against current state-of-the art membranes is provided in Figure h. ,,− ,− The XRD investigation after dye removal tests validated the retention of the crystallinity of TUS-46 membranes (Figure S18), with no changes in the crystal structure or morphology detected by SEM (Figure S7b). Besides, the long-term hydrolytic stability of TUS-46 could be substantiated from the preservation of crystallinity and chemical makeup after immersing in water over 4 weeks, as evident from the XRD profiles (Figure S13) and FT-IR spectra (Figure S14), respectively.…”

Section: Resultsmentioning

confidence: 91%

Control over the Hydrophilicity in the Pores of Covalent Organic Framework Membranes for High-Flux Separation of Dyes from Water

Das

Sekine

et al. 2022

ACS Appl. Nano Mater.

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Membrane separation is making substantial contributions to water purification. Particularly important is the pore-size control designed for molecular sieving. Regarding water permeation, filtration experiments accentuate the importance of hydrophilic pores in enhancing the water adsorption capacity, while hydrophobic pores enable low-friction water diffusion. To reach both the criteria, we herein precisely design the pore metrics and pore functionalities to prepare a covalent organic framework (COF), termed TUS-46, membrane. Credited with pore sizes befitting for size-selective molecular exclusion and negative electrostatic pore walls, the TUS-46 COF membrane shows excellent rejection performance toward anionic dyes. Attributed to the free aldehyde functionalities in the framework resulting from unbalanced stoichiometry, the TUS-46 COF membrane also shows a 10-fold higher water permeance compared to the analogue COF membrane without free aldehyde functionalities. In particular, the in situ construction of hydrophilic nanospaces partaking in high water uptake and hydrophobic nanospaces facilitating fast water diffusion in a single COF structure endows the TUS-46 membranes with unprecedentedly high water flux. The stoichiometric imbalance approach presented herein offers a different route to COF membrane fabrication and may impart with an unprecedented control handle on the permeability and separation selectivity of COF membranes.

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“…42 Meanwhile, the peak at 1643 cm −1 is contributed to C�O stretching vibration of quinone, which is originated from the oxidized self-polymer-ization of catechol in the PDA molecule. 43 The Schiff-base and Michael addition reaction between PEI and PDA is evidenced by the C�N absorption peak, 44 which is located at 1671 cm −1 (Figure 2k). The peak attributed to the C−N + at 1468 cm −1 in EPTAC (Figure 2l) is observed in the ATR-FTIR spectra of PVDF/PDA/PEI/EPTAC membrane, 45 indicating the grafting of quaternary ammonium groups in the composite membrane.…”

Section: Resultsmentioning

confidence: 99%

Durable Polycationic Superhydrophilic Membrane toward Excellent Antibacterial Performance and Oil–Water Separation

Liu,

Wang,

Chu

et al. 2023

ACS Appl. Polym. Mater.

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Polyvinylidene fluoride (PVDF) membranes have been widely used as ultrafiltration and microfiltration membranes for water treatment due to their excellent chemical stability and mechanical strength. However, the low separation efficiency arising from the contamination and the poor reproducibility limit the development of current PVDF-based membranes. Inspired by the offensive and defensive characteristics of spines of a hedgehog, a spinous polycationic polymer, which is synthesized by the polymerization of dopamine (DA) and subsequent grafting of dendritic polyethylenimine (PEI) and 2,3-epoxypropyltrimonium chloride (EPTAC) molecules, is grafted on the surface of the PVDF membrane. The composite PVDF membrane with a stinging structure and superhydrophilic polycations enables long-term protection against bacteria (such as E. coli) and high oil− water separation efficiency, as well as strong antiemulsification ability. The permeation flux of pure water is up to 4777.1 L m −2 h −1 bar −1 and the oil−water separation efficiency is no less than 99.1%. More interestingly, the membrane still retained a good antifouling performance after being recycled through a remolding process. The facile fabrication strategy can be expanded to construct other separation membranes, enabling them to be next-generation separation membranes for high-efficiency water purification.

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Superhydrophilic alkynyl carbon composite nanofiltration membrane for water purification

Cited by 18 publications

References 50 publications

Surface Decoration of Cetyltrimethyl Ammonium Bromide on SiC Particles and Its Effects on the Co-Deposition Process

Surface Decoration of Cetyltrimethyl Ammonium Bromide on SiC Particles and Its Effects on the Co-Deposition Process

Control over the Hydrophilicity in the Pores of Covalent Organic Framework Membranes for High-Flux Separation of Dyes from Water

Durable Polycationic Superhydrophilic Membrane toward Excellent Antibacterial Performance and Oil–Water Separation

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