Impact of a new functionalization of multiwalled carbon nanotubes on antifouling and permeability of PVDF nanocomposite membranes for dye wastewater treatment

Gholami, Sina; Llorens, Joan; Vatanpour, Vahid; Dehqan, Ahmad; Paziresh, Shadi; Cortina, José Luis

doi:10.1016/j.chemosphere.2022.133699

Cited by 90 publications

(29 citation statements)

References 72 publications

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“…Jiang et al used a distillation–precipitation–polymerization approach to grow polymer chains covalently attached on the MWCNT surface and used then as nanofiller with Nafion matrix to create low energy barrier proton transport pathway . A number of interesting articles were published in recent years exploring the effect of surface functionalization of CNTs. − But no report is found to grow block copolymer chains on the CNT surface. In a series of studies, we found that the surface initiated grafting from RAFT polymerization approach allows the in situ formation of the polymer chains on the modified solid surface effectively − and hence we have chosen this technique in the current work, so that we can control the gradual growth of the block copolymer chain at the molecular level, on the surface of the CNT with better precision and check their properties.…”

Section: Introductionmentioning

confidence: 99%

Poly(N-vinyl triazole-b-N-vinyl imidazole) Grafted on MWCNTs as Nanofillers to Improve Proton Conducting Membranes

Mukherjee

Das

Jana

2022

ACS Appl. Nano Mater.

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Carbon nanotubes (CNTs) are of particular interest because of their ability to enhance the mechanical strength in the material; however, processing difficulties of CNTs often restrict utilization up to its full potential. To resolve this, in the current study, we have developed a simple and efficient method to functionalize the surface of a multiwalled carbon nanotube (MWCNT) with precise functional polymer chains, which were covalently graf ted on the surface of the MWCNT, and delved into an application to demonstrate this material as an efficient nanofiller in developing a proton conducting membrane (PEM) from polybenzimidazole (PBI). At first, the MWCNT surface was converted to a polymerizable surface by attaching a trithiocarbonate based chain transfer agent (CTA). Then, a N-heterocyclic block copolymer, namely poly-N-vinyl-1,2,4-triazole-b-poly-N-vinyl imidazole (pNVT-b-pNVI), was grown from the CTA anchored surface with a one-pot surface initiated reversible addition−fragmentation chain transfer (SI-RAFT) technique. Graf ting of block copolymer chain was confirmed by GPC, NMR, TGA, TEM, FESEM, and EDX studies. To the best of our knowledge, this will be the first report of a growing block copolymer structure graf ted covalently on the surface of the MWCNT. The novelty of the work was further enhanced by incorporating pNVT-b-pNVI-g-MWCNT as a nanofiller into the oxypolybenzimidazole (OPBI) membrane to obtain homogeneous nanocomposite membranes with excellent thermomechanical and tensile properties, thermal stability, superior proton conduction when doped with phosphoric acid (PA), and PA holding capacity. The nanocomposite membrane with 2.5 wt % nanofiller loading displayed a tensile stress of 1.8 MPa and a strain of 176% at break. The basic N-heterocyclic rings dangling from the block copolymer chains graf ted on the MWCNT surface allowed formation of strong H-bonding, acid−base interaction with PA, which is responsible for high acid uptake and superior PA retention, and also exhibited proton conductivity as high as 0.164 S cm −1 at 180 °C, which is a 2.6-fold increment when compared with a pristine OPBI membrane. This significant increase in conductivity is attributed to the proton conducting nanochannel pathway generated along the polymer-g-MWCNT surface.

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Section: Introductionmentioning

confidence: 99%

Poly(N-vinyl triazole-b-N-vinyl imidazole) Grafted on MWCNTs as Nanofillers to Improve Proton Conducting Membranes

Mukherjee

Das

Jana

2022

ACS Appl. Nano Mater.

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“…Meanwhile, the obtained membrane had an outstanding antifouling property due to the high hydrophilicity of the modified membrane. Currently, an increasing number of nanomaterials have been attempted to be blended into PVDF matrix, such as metal nanoparticles (Alnairat et al, 2021), covalent organic frameworks (COFs) (Xu et al, 2020;Qian et al, 2022), carbon nanotubes (CNTs) (Ayyaru et al, 2019;Gholami et al, 2022) etc. Thus, the choose and control of nanoparticles in UF membrane is crucial important.…”

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confidence: 99%

PVDF/MOFs mixed matrix ultrafiltration membrane for efficient water treatment

Cheng

Li²,

Xiao³

et al. 2022

Front. Chem.

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Polyvinylidene fluoride (PVDF), with excellent mechanical strength, thermal stability and chemical corrosion resistance, has become an excellent material for separation membranes fabrication. However, the high hydrophobicity of PVDF membrane surface normally leads a decreased water permeability and serious membrane pollution, which ultimately result in low operational efficiency, short lifespan of membrane, high operation cost and other problems. Metal-organic frameworks (MOFs), have been widely applied for membrane modification due to its large specific surface area, large porosity and adjustable pore size. Currently, numerous MOFs have been synthesized and used to adjust the membrane separation properties. In this study, MIL-53(Al) were blended with PVDF casting solution to prepare ultrafiltration (UF) membrane through a phase separation technique. The optimal separation performance was achieved by varying the concentration of MIL-53(Al). The surface properties and microstructures of the as-prepared membranes with different MIL-53(Al) loading revealed that the incorporation of MIL-53(Al) enhanced the membrane hydrophilicity and increased the porosity and average pore size of the membrane. The optimal membrane decorated with 5 wt% MIL-53(Al) possessed a pure water permeability up to 43.60 L m−2 h−1 bar−1, while maintaining higher rejections towards BSA (82.09%). Meanwhile, the prepared MIL-53(Al)/LiCl@PVDF membranes exhibited an excellent antifouling performance.

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“…Using the obtained fluxes, the flux recovery ratio (FRR) of membranes and the fouling resistance characteristics were calculated. Equations () shows the FRR factor to show the membrane potential in contradiction with fouling 29,30 :

FRR (%) = (\frac{J normalw 2}{J normalw 1}) \times 100

Total fouling ratio (R_{t}) = \frac{J_{w 1} - J_{normalp}}{J_{normalw 1}} \times 100

Reversible fouling ratio (R_{r}) = \frac{J_{w 2} - J_{normalp}}{J_{normalw 1}} \times 100

Irreversible fouling ratio (R_{ir}) = \frac{J_{w 1} - J_{w 2}}{J_{normalw 1}} \times 100

…”

Section: Methodsmentioning

confidence: 99%

Fabrication and characterization of different braid‐reinforced PVC hollow fiber membranes to use in membrane bioreactor for wastewater treatment

Keskin

Eryıldız

Paşaoğlu

et al. 2023

J of Applied Polymer Sci

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In this research, polyvinyl chloride (PVC) polymer was applied for the first time in the fabrication of braid-reinforced hollow fiber membranes for ultrafiltration applications. Different concentrations of PVC solutions were cast on tubular braids and coagulated by the phase inversion method in a pure water bath to produce membranes with various porosities and pore sizes. The characterizations such as scanning electron microscopy, overall porosity, contact angle and mean pore size were done to understand membrane morphology.

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Impact of a new functionalization of multiwalled carbon nanotubes on antifouling and permeability of PVDF nanocomposite membranes for dye wastewater treatment

Cited by 90 publications

References 72 publications

Poly(N-vinyl triazole-b-N-vinyl imidazole) Grafted on MWCNTs as Nanofillers to Improve Proton Conducting Membranes

Poly(N-vinyl triazole-b-N-vinyl imidazole) Grafted on MWCNTs as Nanofillers to Improve Proton Conducting Membranes

PVDF/MOFs mixed matrix ultrafiltration membrane for efficient water treatment

Fabrication and characterization of different braid‐reinforced PVC hollow fiber membranes to use in membrane bioreactor for wastewater treatment

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