Durable and chemical resistant ultra-permeable nanofiltration membrane for the separation of textile wastewater

Cao, Ning; Yue, Cheng; Lin, Ziyu; Li, Wenying; Zhang, Haibo; Pang, Jinhui; Jiang, Zhenhua

doi:10.1016/j.jhazmat.2021.125489

Cited by 38 publications

(12 citation statements)

References 34 publications

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“…The specific synthesis route is shown in Schemes S1 and S2 , Supporting Information. [ 48 , 49 ] Obtained by NMR analysis comparing all the protons of PEEKt and monomer accurately, two obvious new peaks appeared at 6.71 and 6.73 ppm, which were attributed to the H a on the benzene ring, indicating that the preparation of PEEKt was successful. (Figures S1 and S2 , Supporting Information) NMR characterization strongly illustrates the successful preparation of PEEKt polymer.…”

Section: Resultsmentioning

confidence: 99%

“…[ 50 , 51 ] In the previous experiments of our research group, it was proved that the polymer precursor (PEEKt) can be hydrolyzed by HCl solution to realize the complete conversion of PEEKt to PEEK. [ 48 , 49 , 52 ] Based on previous work, the PANI/PEEK composite film was prepared by the method of confined polymerization, using PEEKt film as the template, and the one‐step method of confined polymerization within the homogeneous film by means of hydrolysis and oxidation.…”

Section: Resultsmentioning

confidence: 99%

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Based On Confined Polymerization: In Situ Synthesis of PANI/PEEK Composite Film in One‐Step

et al. 2021

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Confined polymerization is an effective method for precise synthesis, which can further control the micro-nano structure inside the composite material. Polyaniline (PANI)-based composites are usually prepared by blending and original growth methods. However, due to the strong rigidity and hydrogen bonding of PANI, the content of PANI composites is low and easy to agglomerate. Here, based on confined polymerization, it is reported that polyaniline /polyether ether ketone (PANI/PEEK) film with high PANI content is synthesized in situ by a one-step method. The micro-nano structure of the two polymers in the confined space is further explored and it is found that PANI grows in the free volume of the PEEK chain, making the arrangement of the PEEK chain more orderly. Under the best experimental conditions, the prepared 16 μm-PANI/PEEK film has a dielectric constant of 205.4 (dielectric loss 0.401), the 75 μm-PANI/PEEK film has a conductivity of 3.01×10 −4 S m −1 . The prepared PANI/PEEK composite film can be further used as electronic packaging materials, conductive materials, and other fields, which has potential application prospects in anti-static, electromagnetic shielding materials, corrosion resistance, and other fields.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Based On Confined Polymerization: In Situ Synthesis of PANI/PEEK Composite Film in One‐Step

et al. 2021

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“…Researchers from Dow Chemical Company used high-boiling solvents and plasticizers to dissolve PEEK at high temperatures and spun them to prepare PEEK hollow fiber membranes. ,, In addition, a mixture of molten PEEK and PEI can be employed to create membrane, and after that, PEI can be dissolved or broken down into small fragments by chemical reactions to etch the membrane’s distinctive pore structure. − Researchers have also sought alternatives to PEEK, such as sulfonated polyether ether ketone (SPEEK), which introduces functional groups that hinder the stacking of molecular chains in structural design, and poly(ether ether ketone) with cardo groups (PEEK-WC), which introduces relatively flexible sp 3 hybridization sites in the molecular chain (Figure a,b). − Despite every material being valuable, the solvent resistance of PEEK is sacrificed due to this structural alteration. Compared with this irreversible chemical modification and improvement, it is a more useful idea to produce membranes using the precursor polymers of PEEK and then convert them to PEEK using chemical processes.…”

Section: Introductionmentioning

confidence: 99%

Design of Precursor Polymers Assists the Processing of Poly(ether ether ketone) Membranes in Solvents

Zhang,

You,

Wang

et al. 2024

Macromolecules

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By examining the structural patterns of the imine monomers engaged in polycondensation, a series of poly(ether ether ketone) precursor polymers (PEEKi-N-acyl) modified with N-acyl Imine groups were designed in this work. Contrary to poly(ether ether ketone) (PEEK), these precursor polymers have superior solubility, enabling their production in solution and processing of membrane components. The membrane components' substance could undergo an imine hydrolysis reaction in an acidic environment, turning them back into PEEK and giving them solvent resistance. In addition, the homogeneous polymer membranes of this series exhibit spontaneous pore formation under the action of ethanol, which was caused by solvent-induced internal stress relaxation. By utilizing the properties of this type of polymer, precursor polymers can be processed into PEEK sponge-like porous membranes, expanding the processing morphology and application range of PEEK.

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“…Consequently, it is crucial to remove dyes from wastewater using a variety of techniques [ 17 ]. Many techniques have been deployed to remove dyes from wastewater including adsorption [ 18 ], membrane filtration [ 19 ], nanofiltration [ 20 ], coagulation and flocculation [ 21 ], oxidation [ 22 ], catalytic reduction [ 23 ] etc.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Naturally Derived Chitosan and Ilmenite Sand-Based TiO2/Fe2O3/Fe-N-Doped Graphitic Carbon Composite for Photocatalytic Degradation of Methylene Blue under Sunlight

et al. 2023

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Fabrication of chitosan and ilmenite sand-based novel photocatalysts through the catalytic graphitization of chitosan is reported. Nanocomposites consisted of TiO2, Fe2O3 and Fe nanoparticles dispersed on a nitrogen-doped graphitic carbon framework. The surface area, pore volume and macropore structure of the carbon matrix is disturbed by the heterogeneously distributed nanoparticles. The extent of graphitization expanded with increasing metal loading as indicated by variation in the ID/IG ratio. The nanomaterial’s surface consists of Fe3+ and Ti4+, and graphitic, pyridinic and pyrrolic nitrogen were found in the carbon matrix. The band gap values of the composites varied in the 2.06–2.26 eV range. The photocatalytic activity of the synthesized nanomaterials was determined, and the highest rate constant for the photodegradation of methylene blue under sunlight was 4.4 × 10−3 min−1, which resulted with 10 mg/L MB and 25 mg of the best-performing catalyst. The rate constant rose with increasing concentrations of persulfate added to the medium. The rate constant greatly diminished with the addition of isopropyl alcohol as it scavenged hydroxyl radicals. The presence of co-pollutants including Pb2+, rhodamine B, PO43− and Cl− curtailed the rate of reaction. The activity reduced with an increasing number of uses of the catalyst.

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Durable and chemical resistant ultra-permeable nanofiltration membrane for the separation of textile wastewater

Cited by 38 publications

References 34 publications

Based On Confined Polymerization: In Situ Synthesis of PANI/PEEK Composite Film in One‐Step

Based On Confined Polymerization: In Situ Synthesis of PANI/PEEK Composite Film in One‐Step

Design of Precursor Polymers Assists the Processing of Poly(ether ether ketone) Membranes in Solvents

Fabrication of Naturally Derived Chitosan and Ilmenite Sand-Based TiO2/Fe2O3/Fe-N-Doped Graphitic Carbon Composite for Photocatalytic Degradation of Methylene Blue under Sunlight

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