Preparation Of Composite Membranes Research Articles

Preparation and Characterization of PVA Composite Membranes with TiO2 and TiO2/ZrO2 Nanoparticles: A Comparative Study

Background:: This study presents the successful fabrication of composite membranes composed of polyvinyl alcohol (PVA) polymer blended with titanium dioxide (TiO2) nanoparticles and a combination of titanium dioxide/zirconium dioxide (TiO2/ZrO2) nanoparticles. The features of composite membranes were analyzed with a specific focus on comparing the characteristics of PVA/TiO2 and PVA/TiO2/ZrO2 composite membranes. Methods:: TiO2 and ZrO2 nanoparticles were prepared using the sol-gel method. PVA/TiO2 and PVA/TiO2/ZrO2 composite membranes were fabricated utilizing the solution casting method. A controlled method of production of nanoparticles and their uniform dispersion inside the polymer matrix are the key components contributing to the success of this approach. TiO2 and ZrO2 nanoparticles and their composite membranes were characterized through various characterization methods encompassing X-ray diffraction (XRD) study, UV-visible absorption spectroscopy, photoluminescence (PL) spectroscopy, transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) spectroscopy and atomic force microscopy (AFM) analysis. Results:: The XRD study revealed improved crystallinity in composite membranes. The PVA/TiO2/ZrO2 membrane possessed a greater level of crystallinity than the PVA/TiO2 membrane. The composite membranes exhibited enhanced absorption and PL behaviour. The FTIR spectra revealed the creation of a charge-transfer complex among the PVA, TiO2 and ZrO2. The AFM study indicates that surface roughness increases after doping Conclusions:: Good concurrence is established between grain size calculated by XRD and TEM. PVA/TiO2/ZrO2 exhibits more improved characteristics than PVA/TiO2 because of the composite versatile properties resulting from the combining of two inorganic structural components with polymer. Such characteristics render it an appealing option for optical and optoelectronic device applications.

Preparation of ion-doped nano-hydroxyapatite Bombyx Mori silk fibroin composite membrane by electrochemical deposition for enhancing osteogenic differentiation in vitro and in vivo.

Preparation of ion-doped nano-hydroxyapatite Bombyx Mori silk fibroin composite membrane by electrochemical deposition for enhancing osteogenic differentiation in vitro and in vivo.

Mechanistic Insights into Mitigation of Combined Scaling-Biofouling for a Novel Thin-Film Composite Membrane Based on Incorporated Defensive-Offensive Strategy.

Combined scaling-biofouling is commonly encountered in practical wastewater treatment and desalination due to the coexistence of inorganic scalants and microorganisms, which is a major obstacle limiting the applications of membrane-based technologies. In this study, we developed a simple and effective modification method for the preparation of an anticombined scaling-biofouling thin-film composite (TFC) nanofiltration membrane via a synergetic strategy based on defensive (i.e., sequestering carboxyl groups) and offensive (i.e., immobilizing antimicrobial peptides (AMPs)) functions. According to the Extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) analysis, the sequestration of carboxyl groups by AMPs diminishes the acid-base polarity interaction between the biofoulants and membranes, playing a critical role in dismantling the bridge of carboxyl-Ca2+-carboxyl and subsequently rendering both scaling ions and carboxyl groups unavailable to fouling. Meanwhile, the immobilization of AMPs on the membranes prevents microbial metabolism and growth by contact-killing mechanisms, endowing the membrane resistance to severe biofouling in the presence of scaling ions. Furthermore, the synergetic effects overcome the permeability-rejection-antifouling trade-off by enhanced water permeance without sacrificing salt rejection. This research provides a novel dimension for developing high-performance TFC membranes for the mitigation of combined scaling-biofouling in the practical application of wastewater treatment and desalination.

Preparation of Composite Nanofiber Membranes via Solution Blow Spinning and Solution Impregnation Method for CO2 Capture.

Carbon dioxide (CO2) capture is a pivotal technology for achieving the goal of carbon neutrality. This paper proposes a novel process, SBS + SI, which integrates Solution Blow Spinning (SBS) and Solution Impregnation Method (SI), using polyamide 66 (PA66) as the carrier material and high-purity tetraethylenepentamine (TEPA) as the modifier, to fabricate nanofiber adsorption membranes with varying carrier structures and modifier component loadings. The CO2 adsorption performance and pore structure of the adsorbents were investigated using characterization techniques, such as Scanning Electron Microscopy (SEM), Thermogravimetric Analysis (TGA), Brunauer-Emmett-Teller (BET) surface area and pore size analysis, and Fourier Transform Infrared Spectroscopy (FT-IR). The results indicate that as the mass fraction of TEPA increases, the pores in the nanofiber membranes gradually decrease, while the CO2 adsorption capacity significantly increases. The PA66 nanofiber membrane achieves peak CO2 capture performance (44.7 mg/g at 25 °C) at 15% TEPA loading. Meanwhile, the composite nanofiber membranes also exhibit outstanding CO2/N2 selectivity with a separation factor reaching 28. Thermal regeneration tests at 90 °C confirm the composite's outstanding cyclic stability and regenerability, demonstrating its potential for practical carbon capture applications. These findings suggest that the nanofiber adsorbents prepared by the SBS + SI process have broad application prospects in the field of CO2 capture.

Incorporation of Ag-ZnO Nanoparticles into PVDF Membrane Formulation to Enhance Dye Retention, Permeability, and Antibacterial Properties.

Ultrafiltration is essential for wastewater treatment, but it faces challenges such as selectivity, control, and fouling reduction. Incorporating nanoparticles into membranes enhances retention, boosts permeability, and limits fouling, improving overall performance. This study explores the properties of PVDF/Ag-ZnO composite membranes, highlighting the influence of silver-doped zinc oxide nanoparticles on membrane structure, performance, and antimicrobial effect. The non-solvent-induced phase separation (NIPS) method successfully led to the preparation of composite membranes; this method used different doses of silver-doped zinc oxide (Ag-ZnO) nanoparticles with Poly(vinylidene fluoride) (PVDF). Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and water contact angle measurements were used to validate the influence of nanoparticles on the composite membrane (PVDF/Ag-ZnO) structure. Conversely, morphology (porosity, surface rigorosity), hydrophilicity, and permeability were analyzed through contact angle, image analysis, and flux measurement. In addition, the membranes were tested for antimicrobial activity against E. coli. Membrane performance shows that the incorporation of 20% w/w Ag-ZnO resulted in improved water permeability, which was about 2.73 times higher than that of a pure PVDF membrane (192.2 L·m-2·h-1·bar-1). The membrane porosity showed a linear increase with the number of NPs. The resultant asymmetric membrane was altered to increase the number of pores on the top surface by 61% and the cross-sectional pore surface by 663%. Furthermore, a high antibacterial activity of Ag-ZnO 20% was shown.

Preparation of PA6-PVA composite fiber membrane based on coaxial spinning method and wettability study

Preparation of PA6-PVA composite fiber membrane based on coaxial spinning method and wettability study

Preparation of Cobalt Oxide Powders Synthesized by Green Chemistry Method and Improving the Antibacterial Performance of PES Membrane

Polyethersulphone (PES) composite membrane was prepared by green synthesized cobalt oxide (Co3O4) powders using the phase inversion method. Both Co3O4 powders and prepared composite membranes were characterized by using Scanning Electron Microscopy (SEM) with Energy Dispersive X-Ray Analysis (EDX) and X-Ray Diffraction (XRD) techniques. Three different concentration (0.5%, 1.0%, 2.0%) was chosen for composite membrane preparation. The performance of (Co3O4) powders blended composite membranes were evaluated for pure water flux, BSA solution flux, and BSA rejection. In the antioxidant test, DPPH process was assayed. The highest DPPH free radicals inhibition was 86.43% for Co3O4 powders synthesized from walnut leaves extract at concentration of 100 mg/L. In vitro DNA cleavage studies of Co3O4 powders with plasmid DNA were carried out by using agarose gel process and Co3O4 powders completely cleaved the DNA molecules. Co3O4 powders displayed remarkable antimicrobial ability against common bacterial (Pseudomas aeruginosa, Escherichia coli, Enterococcus hirae, Legionella pneumophila, Staphylococcus aureus, and Enterococcus faecalis) and fungal (Candida tropicalis and Candida parapsilosis) pathogens. Additionally, these newly prepared Co3O4 powders also showed considerable E. coli growth inhibiton efficiency. Furthermore, Co3O4 powders were very active as anti-biofilm agents producing activity by 77.5% and 89.02% against S. aureus, and P. aeruginosa, respectively. PES membrane blended with Co3O4 powders showed good antibacterial abilities. These results recommend that Co3O4 powders possess considerable biomedical and environmental applications.

Preparation and Performance Analysis of Hydrophobic Composite Membranes with Modified Nano-silica for Construction Applications

In this study, tetraethyl orthosilicate (TEOS) was used as a hydrolysis precursor to prepare nanoscale silica powder and sol through a sol-gel process. Based on the nanosilica (nano-SiO2) sol, an in-situ modification technique was employed using γ-methacryloxypropyltrimethoxysilane (KH570) and hexadecyltrimethoxysilane (HDTS) as modifiers to obtain modified nano-SiO2 sol. The modified sol was applied onto glass substrates by manual coating and subsequently cured in a muffle furnace to form a film. The resulting nanocomposite films were characterized by Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), contact angle (CA) measurement, thermogravimetric analysis (TGA), and UV-visible spectroscopy (UV-vis). Analysis of the results indicated that the KH570 and HDTS-modified nano-SiO2 coatings, due to their large steric hindrance groups, exhibited excellent transparency and hydrophobicity. This modified material shows significant potential for future applications.

Preparation of composite membranes with high tensile strength and antibacterial properties based on Ag-nanoparticles deposition on bacterial cellulose/apocynum venetum

Preparation of composite membranes with high tensile strength and antibacterial properties based on Ag-nanoparticles deposition on bacterial cellulose/apocynum venetum

Preparation of Thin-Film Composite Membranes for Magnesium–Lithium Separation by Interface Polymerization of Linear Diamines and Piperazine as Aqueous Monomers

Preparation of Thin-Film Composite Membranes for Magnesium–Lithium Separation by Interface Polymerization of Linear Diamines and Piperazine as Aqueous Monomers

Preparation of Polypseudorotaxane Composite Membrane and Its Application in Separation Field

Preparation of Polypseudorotaxane Composite Membrane and Its Application in Separation Field

Enhanced removal of Cr(VI) from aqueous solutions using a zero-valent nickel/iron-PDA@PVDF membrane prepared via a simple blending method

Enhanced removal of Cr(VI) from aqueous solutions using a zero-valent nickel/iron-PDA@PVDF membrane prepared via a simple blending method

Study on preparation of a pizza-like attapulgite-based composite membrane and its performance on methylene blue and ciprofloxacin removal

Study on preparation of a pizza-like attapulgite-based composite membrane and its performance on methylene blue and ciprofloxacin removal

A High-Performance Polyimide Composite Membrane with Flexible Polyphosphazene Derivatives for Vanadium Redox Flow Battery.

A sulfonated polyimide, S-F-abSPI, with alkyl sulfonic acid side chains, and a polyphosphonitrile derivative, poly[4-methoxyphenoxy (4-fluorophenoxy) phosphazene] (PFMPP), were designed and synthesized. Composite modification of the S-F-abSPI membrane was carried out using PFMPP, resulting in the preparation of composite membranes with different composite ratios, which were then subjected to performance testing and characterization. Experimental results revealed a significant enhancement in the proton conductivity of the S-F-abSPI membrane, reaching 0.116 S cm-1, slightly higher than that of the N212 membrane. The S-F-abSPI/1% PFMPP composite membrane exhibited the optimal comprehensive performance, with a surface resistance as low as 0.54 Ω cm2, comparable to that of the N212 membrane. At a high current density of 200 mA cm-2 during charge-discharge, the composite membrane achieved a voltage efficiency (VE) of 83.12% and an energy efficiency (EE) of 81.95%. Cycling tests over 200 cycles demonstrated the composite membrane's excellent long-term cycling stability. The alkyl sulfonic acid side chains enhanced the proton conductivity of the membrane, while electrostatic potential distribution calculations indicated strong interactions between PFMPP and the base membrane, enhancing the membrane's mechanical strength, reducing vanadium ion permeability, and improving chemical stability and vanadium ion selectivity. This composite membrane holds promise for high-performance VRFB applications.

From single tube to multi-channel configuration: Constructing nanofiltration membranes with superior adhesion strength on the ceramic support by interfacial polymerization

From single tube to multi-channel configuration: Constructing nanofiltration membranes with superior adhesion strength on the ceramic support by interfacial polymerization

PTFE composite membrane with peroxymonosulfate activation self-cleaning for highly-efficient oil-water emulsion separation and dye degradation

PTFE composite membrane with peroxymonosulfate activation self-cleaning for highly-efficient oil-water emulsion separation and dye degradation

Enhanced CO₂ Detection Using Potentiometric Sensors Based on PIM‐1/DBU Imidazolate Membranes

Abstract A novel potentiometric sensor for carbon dioxide (CO2) detection utilizing a composite membrane of Polymer of Intrinsic Microporosity (PIM‐1) and 18‐diazabicyclo[5.4.0]undec‐7‐ene imidazolate (DBU‐imidazolate) is presented. The high surface area and gas permeability of PIM‐1, combined with the chemical affinity and ion‐exchange properties of DBU‐imidazolate, contribute to enhanced CO2 sensitivity and selectivity. The research objectives included the synthesis of PIM‐1 and DBU‐imidazolate, the preparation of composite membranes, and the evaluation of their performance as CO2 sensors. Solvent casting and impregnation methods are employed to prepare the membranes, which are characterized using Thermal Gravimetric Analysis (TGA), and Field Emission Scanning Electron Microscopy (FESEM). CO₂ absorption tests and Electrochemical Impedance Spectroscopy (EIS) are conducted to assess the sensors' performance. The PIM‐1/DBU‐imidazolate membrane exhibited high efficiency in CO₂ capture and release. Open circuit voltage (OCV) measurements are performed under varying concentrations of CO2 exposure and cycles of adsorption/desorption. Results show that the membrane achieves steady state faster at higher CO2 concentrations, with a logarithmic relationship between CO2 concentration and voltage variation, indicating potential for CO2 detection in human environments. These results confirm the sensor's ability to detect varying CO2 concentrations, highlighting its potential for reliable and efficient CO2 monitoring in environmental and industrial applications.

Natural redox mediator anthraquinone aloe-emodin facilitated the in-situ mineralized γ-FeO(OH) membrane for the removal of tannic acid through photocatalytic-PMS activation

Natural redox mediator anthraquinone aloe-emodin facilitated the in-situ mineralized γ-FeO(OH) membrane for the removal of tannic acid through photocatalytic-PMS activation

Lithium aluminium titanium phosphate based ceramic composite membrane for selective lithium-ion separation via a scalable membrane-based electrodialysis process

Lithium aluminium titanium phosphate based ceramic composite membrane for selective lithium-ion separation via a scalable membrane-based electrodialysis process

Dual synergies of functionalized hydrophilic MOFs based poly (aryl ether ketone sulfone) ultrafiltration membranes: Electrostatic action and pore size screening

Dual synergies of functionalized hydrophilic MOFs based poly (aryl ether ketone sulfone) ultrafiltration membranes: Electrostatic action and pore size screening