Simultaneously covalent and ionic bridging towards antifouling of GO-imbedded nanocomposite hollow fiber membranes

Novel Thin-Film nanocomposite hollow fiber membranes in modules with reduced reverse solute flux for pressure retarded osmosis

Preparation and characterization of electrospun cellulose nanocrystals-reinforced trans-1,4-polyisoprene nanocomposite elastomeric fiber membranes

This study investigated experimental parameters to fabricate polymeric carbon nanocomposite hollow-fiber membranes with graphene oxide and multi-walled carbon nanotubes. This case was different from that of flat-sheet type membranes in that the characteristics of the hollow-fiber type membranes were affected by the structure of the spinneret, the flow rate of the injected polymer and draw solution, and the mixing ratio. The membranes were characterized in terms of mechanical strength, porosity, hydrophilicity, and permeate flux using different solutions. The results reveal a mechanical strength of the carbon nanocomposite hollow-fiber membranes that is about 47.8% higher than that of hollow-fiber membranes without carbon nanomaterials. The porosity and surface hydrophilicity changed to produce more applicable membranes for water and wastewater treatment. As for the permeate flux, the nanocomposite membrane with graphene oxide showed a higher flux compared to the multi-walled carbon nanotubes membrane, which could be influenced by structural effects of the carbon materials.

Effect of different additives on the physicochemical properties and performance of NLDH/PVDF nanocomposite membrane

Fabrication of porous polymeric nanocomposite membranes with enhanced anti-fouling properties: Effect of casting composition

We explored a new strategy using well dispersed functionalized Fe2O3 nanoparticles to fabricate a polyetherimide nanocomposite hollow fiber membrane with enhanced surface and anti-biofouling properties.

Nanosized zirconium phosphate and nano fibrous cerium phosphate , Zr(HPO4)2.H2O(nZrP) , Ce(HPO4)2.2.9H2O (nCePf), respectively, were prepared and characterized.  Mixing slurry aqueous solution of (nZrP and nCePf ) in 25:75 wt/wt% mixing ratios) , respectively, lead to formation of novel zirconium phosphate- fibrous cerium phosphate nanocomposite membrane, [Zr(HPO4)2]0.25[Ce(HPO4)2]0.75.3.87H2O(nZrP-nCePf), was characterized. Zirconium phosphate-fibrous cerium phosphate/ polybenzimidazole-/polybenzimidazolee-co-polyaniline-/polybenzimidazole-co-polypyrrole-/polybenzimidazole-co-polyindole nanocomposite membranes were prepared via in-situ chemical oxidation polymerization of the benzimidazole, and its co-monomers in alcohol, that was promoted by the reduction of Ce(iv) ions present in the inorganic matrix of (nZrP-nCePf ) nanocomposite membrane. A possible explanation is  nCePf  , present on the surface of composite membrane, is attacked by benzimidazole and its co-monomers , converted to cerium(III) orthophosphate(CePO4). The resultant materials were characterized by elemental (C,H,N) analysis , FT-IR, and scanning electron microscopy(SEM) .. SEM images of the resulting nanocomposites reveal a uniform distribution of the polybenzimidazole and its co-polymers on the inorganic matrix. From elemental (C,H,N) analysis the amount of organic material (PBI) present in (nZrP-nCePf)/PBI composite found to be = 5.7% in wt.. T.he amount of organic materials present in copolymers found to be for (nZrP-nCePf)/PBI-co-PANI (PBI = 9.33%, PANI= 13.32% in wt)., for  (nZrP-nCePf) /PBI -co-PPy (PBI = 12.85%, PPy = 7.1% in wt) , and for (nZrP-nCePf) /PBI-co-PIn ( PBI = 16.47% , PIn = 8.81% in wt).

Nanoclay embedded mixed matrix PVDF nanocomposite membrane: Preparation, characterization and biofouling resistance

Fabrication and characterization of superparamagnetic poly(vinyl pyrrolidone)/poly(L-lactide)/Fe3O4 electrospun membranes

An improved process for polyvinylidene fluoride membrane preparation by using a water soluble diluent via thermally induced phase separation technique

We have designed and developed nonwoven fabric supported electrospun polymeric nanofibrous‐based membrane for robust filtration system for ecological sustainability of clean water. The fabricated nanocomposites filters were tested for the removal of chromium (VI) toxic heavy metal ions from contaminated feedstock water. The interpenetrating network like morphological structure obtained from pure and composite nanofibers‐based membranes have been thoroughly investigated to understand the structure–properties of highly entangled system. It has been found that incorporating functional moieties onto nanocomposite membranes significantly impacts the absorption efficiency of toxic metals. The pore sizes of the hierarchical geometries have been varied to insight into its impact on flow rate and efficiency of filtration. The strategy of interfacing the multifunctional composite polyethylene terephthalate nanofiber membrane supported on nonwoven fabric to generate heterostructures has found to provide mechanically stable platform for efficient metal ion removal. It has been found by BET surface area analysis that the nanofibers reinforced with functional nanomaterials has controlled pore geometry compared to pristine PET electrospun nanofibers which lead to higher absorption of metal ions. We have highlighted the importance of mechanically stable electrospun polymeric nanofibers membrane‐based mitigation strategies to meet the huge demand of potable water for long‐term environmental sustainability.Highlights Mechanically toughened freestanding nanofibers mat supported on nonwoven fabric. Functionally upgrade nanofibers by incorporation of carbon based nanofillers. Controlled porosity by morphological optimization for removal of contaminates.

Membrane modification with carbon nanomaterials for fouling mitigation: A review

Construction of core-shell nanofiber membrane with enhanced interface compatibility for lithium-metal battery

Biofouling is a serious issue in membrane-based water and wastewater treatment as it critically compromises the efficacy of the water treatment processes. This investigation demonstrates the antimicrobial and antifouling properties of a nanocomposite membrane system composed of carboxyl-functionalized graphene oxide (COOH-GO) and polyphenylsulfone (PPSU). The PPSU/COOH-GO nanocomposite membrane exhibited excellent antimicrobial properties, achieving maximum bacteriostasis rates of 74.2% and 81.1% against the representative Gram-negative bacteria (Escherichia coli and Pseudomonas aeruginosa, respectively) and 41.9% against the representative Gram-positive bacterium (Staphylococcus aureus). The PPSU/COOH-GO nanocomposite membrane inhibited the attachment, colonization, and the biofilm formation of three species. Antifouling was assessed through filtration experiments using a model foulant bovine serum albumin (BSA). The fouling mechanisms were investigated by Hermia's models (complete blocking, intermediate blocking, standard blocking, and cake formation), and the analysis involved fitting the volumetric flux decline experimental data to models. The fouling study revealed a less irreversible fouling and increased flux recovery ratio for the PPSU/COOH-GO nanocomposite membrane. Complete blocking of pores and cake formation were the major fouling mechanisms for the membrane.

A novel nanocomposite fiber membrane, made from polycaprolactone (PCL), barium titanate (BT), and sodium lauryl sulfate (SLS), was prepared and investigated for its methylene blue (MB) adsorption properties and for antibacterial activity. The nanofibers (SLS-PCL/BT) were fabricated via electrospinning and characterized using SEM, FTIR, AFM, and contact angle measurements. Batch adsorption tests assessed the effects of pH, contact time, sorbent dose, initial dye concentration, temperature, and salt concentration. The maximum uptake of MB uptake was achieved at pH 12, sorbent dose of 60 mg, and 180 min contact time, and at room temperature. The adsorption data exhibited an excellent fit with the Langmuir isotherm model with a maximum adsorption of 68.79 mg g−1. Kinetic studies revealed the adsorption process conformed to a pseudo-second-order model. The nanocomposite fibers demonstrated good reusability over 5 adsorption–desorption cycles. The SLS-PCL/BT nanofiber membrane displayed antibacterial activity against various strains of pathogenic bacteria (S. aureus, B. subtilis, E. coli, and Salmonella) with an inhibition zone of 16.56, 19, 25, and 25 mm, respectively. This study demonstrates that SLS-PCL/BT nanofibers are highly effective, reusable adsorbents for removal of MB from aqueous solutions. Moreover, it has antibacterial properties against some bacterial strains.