Multilayer Polymeric Nano composite Membrane for Oxygen Separation

2019 ◽  
Vol 1 (2) ◽  
pp. 1-11
Author(s):  
Gobi Nallathambi ◽  
Hazel Dhinakaran
Keyword(s):  
Polymer Concentration ◽  
Sio2 Nanoparticles ◽  
Air Separation ◽  
Regression Equations ◽  
Permeate Flux ◽  
Nano Composite ◽  
Box Behnken Design ◽  
Oxygen Selectivity ◽  
Multilayer Membrane ◽  
Spun Fiber

Air separation is a process of separating primary components from the atmospheric air. Development of membrane technologies plays a key role in air separation. Multi-layer polymeric nanocomposite membranes have been developed by a novel technique using Polyacrylonitrile (PAN) and cellulose acetate (CA) along with nano silica particles (SiO2) to obtain a higher oxygen selectivity and permeability. For the construction of the multilayer membrane, the Box-Behnken design has been used by employing three independent variables namely PAN Electro spinning time, the SiO2 percentage in the PAN polymer and CA/PEG polymer concentration. The developed membranes have been characterized for its surface morphology and physical properties. Along with the analysis of compound desirability, the results were also subject to statistical analysis in order to form regression equations. The electro spun fiber diameter increases along with the concentration of SiO2 nanoparticles and the range is from 50 nm to 400 nm. Moreover, the maximum pore size on the surface of the membrane lies between 200 to 400 nm whereas the maximum percentage of oxygen purity obtained is 48 with the permeate flux of 5.45 cm3/cm2/min.

MODELING AND OPTIMIZING PROPERTIES OF NANOCLAY–NITRILE RUBBER COMPOSITES USING BOX–BEHNKEN DESIGN

2011 ◽  
Vol 84 (4) ◽  
pp. 455-473 ◽  
Author(s):  
Meera Balachandran ◽  
S. S. Bhagawan ◽  
R. Muraleekrishnan
Keyword(s):  
Layered Silicate ◽  
Silica Content ◽  
Response Surfaces ◽  
Regression Equations ◽  
Launch Vehicles ◽  
Elongation At Break ◽  
Box Behnken Design ◽  
Contour Plots ◽  
The Relationship ◽  
Good Agreement

Abstract The mechanical behavior of acrylonitrile butadiene copolymer (NBR)–organomodified layered silicate (nanoclay) was modeled using design of experiments approach. A Box–Behnken design with three factors and three levels was used to model the relationship between properties of NBR nanocomposites and the ingredients. The factors considered in the design were silica content, nanoclay loading, and dicumyl peroxide content. The nanocomposites were evaluated for tensile strength, modulus, elongation at break, oxygen permeation rate, and effect of oil and heat aging on mechanical properties. Regression equations were generated to model the properties of interest and generate response surfaces and contour plots. The predicted properties of the nanocomposites were in good agreement with the experimental results. The contour plots were overlaid within the applied constraints to identify the combination of factor ranges that gives the optimal performance of the nanocomposites for application as control system bladders in satellite launch vehicles.

scholarly journals Impact of MWCO and Dopamine/Polyethyleneimine Concentrations on Surface Properties and Filtration Performance of Modified Membranes

Membranes ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 239
Author(s):  
Mariane Carolina Proner ◽  
Ingrid Ramalho Marques ◽  
Alan Ambrosi ◽  
Katia Rezzadori ◽  
Cristiane da Costa ◽  
...  
Keyword(s):  
Surface Characterization ◽  
Polymer Concentration ◽  
Permeate Flux ◽  
Protein Solution ◽  
Waste Streams ◽  
Membrane Pore ◽  
Membrane Performance ◽  
Membrane Surfaces ◽  
Potential Contact ◽  
Membrane Pore Size

The mussel-inspired method has been investigated to modify commercial ultrafiltration membranes to induce antifouling characteristics. Such features are essential to improve the feasibility of using membrane processes in protein recovery from waste streams, wastewater treatment, and reuse. However, some issues still need to be clarified, such as the influence of membrane pore size and the polymer concentration used in modifying the solution. The aim of the present work is to study a one-step deposition of dopamine (DA) and polyethyleneimine (PEI) on ultrafiltration membrane surfaces. The effects of different membrane molecular weight cut-offs (MWCO, 20, 30, and 50 kDa) and DA/PEI concentrations on membrane performance were assessed by surface characterization (FTIR, AFM, zeta potential, contact angle, protein adsorption) and permeation of protein solution. Results indicate that larger MWCO membranes (50 kDa) are most benefited by modification using DA and PEI. Moreover, PEI is primarily responsible for improving membrane performance in protein solution filtration. The membrane modified with 0.5:4.0 mg mL−1 (DA: PEI) presented a better performance in protein solution filtration, with only 15% of permeate flux drop after 2 h of filtration. The modified membrane can thus be potentially applied to the recovery of proteins from waste streams.

scholarly journals Aiming to the superior of phosphor pattern: Influence of SiO2 nanoparticles on photoluminescence intensification of YAG:Ce

2021 ◽  
Vol 11 (6) ◽  
pp. 4833
Author(s):  
My Hanh Nguyen Thi ◽  
Thuc Minh Bui ◽  
Nguyen Doan Quoc Anh
Keyword(s):  
Yttrium Aluminum Garnet ◽  
Sol Gel ◽  
Micelle Formation ◽  
Sio2 Nanoparticles ◽  
Tem Analysis ◽  
Nano Composite ◽  
Light Emitting ◽  
X Ray ◽  
Wide Scale ◽  
Poly Ethylene

<span lang="EN-US">Yttrium aluminum garnet (YAG: RE) rare-earth-doped phosphors have great photoluminescence (PL) characteristics and are commonly used in light-emitting rectifying tubes. The RE elements used in these phosphors, however, are precious and in shortage. The production of phosphorus containing a limited amount of RE content is therefore essential. One solution is to manufacture Nano composite phosphors that use an inexpensive and more easily available content as a matrix for RE oxide. In this research, we developed a YAG: Ce/SiO2 Nano composite using a sol-gel procedure; in order to impulse micelle formation and agglomeration, poly (ethylene glycol) and urea have been added, respectively. X-ray diffraction, scanning and transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy were used to characterize the Nano composites. In proposing an explanation for this enhancement, we defined the concentration of SiO2 that produced optimum PL enhancement and used geometric models as well as the characterization consequences. Our results demonstrated that a 10% SiO2 concentration produced a 120% PL intensity of pure YAG:Ce. TEM analysis revealed that SiO2 nanoparticles filled the voids between the YAG:Ce crystals' single grain borders, hence inhibiting light scattering, resulting in increased PL. This procedure would be beneficial for the synthesis of low-RE and high-PL phosphors on a wide scale.</span>

Development of Box Behnken Design to Predict the Optimum Operating Condition of Rectangular Sheet Membrane to Increase Permeate Flux

2020 ◽  
pp. 399-413
Author(s):  
Anirban Banik ◽  
Sushant Kumar Biswal ◽  
Tarun Kanti Bandyopadhyay
Keyword(s):  
Pore Size ◽  
Optimum Operating ◽  
Operating Pressure ◽  
Permeate Flux ◽  
Optimum Conditions ◽  
Optimum Operating Condition ◽  
Box Behnken Design ◽  
Pareto Analysis ◽  
Feed Velocity ◽  
Sheet Membrane

The chapter focuses on the implementation of Box Behnken Design (BBD) to increase permeate flux of rectangular sheet membrane. Box Behnken Design (BBD) was used to optimize the membrane operation by predicting the optimum conditions. The factors such as operating pressure, feed velocity, and pore size were selected as the input of the model. The study illustrates the optimum conditions of operating pressure, feed velocity, and pore size, which was found to be 14.5Pa, 0.179 m/s, and 0.59µm respectively. Analysis of variance was used to identify the significant terms in the model equation. The effect of input parameters on the model output evaluated using Pareto analysis. It shows that operating pressure is the most significant parameter in the developed model. The BBD predicted results follow the actual results with high accuracy.

scholarly journals Membrane distillation of saline and oily water using nearly superhydrophobic PVDF membrane incorporated with SiO2 nanoparticles

2018 ◽  
Vol 78 (12) ◽  
pp. 2532-2541 ◽  
Author(s):  
N. Hamzah ◽  
M. Nagarajah ◽  
C. P. Leo
Keyword(s):  
Polyvinylidene Fluoride ◽  
Volume Ratio ◽  
Sio2 Nanoparticles ◽  
Membrane Distillation ◽  
Permeate Flux ◽  
Oil And Grease ◽  
Sem Images ◽  
Water Contact ◽  
Pvdf Membrane ◽  
Oily Water

Abstract Fat, oil and grease in wastewater generated from household kitchens, restaurants and food processing plants affect sewer systems, water resources and environment adversely. Hence, membrane distillation of saline and oily water was studied using a nearly superhydrophobic membrane developed in this work. Polyvinylidene fluoride (PVDF) membrane incorporated SiO2 nanoparticles was synthesized via phase inversion with dual baths and modified using hexadecyltrimethoxy silane. The volume ratio of silane to ethanol was varied between 1:200 to 1:25. The membrane characteristics were examined using a goniometer, a porometer, scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The PVDF-SiO2 membrane modified using the volume ratio of 1:50 achieved the highest water contact angle of 141.6° and LEP of 2.642 bar. This membrane was further tested in membrane distillation to observe the permeate flux of distilled water, saline solution (1 M NaCl) as well as saline and oily solution (1 M NaCl; 1,000 ppm of palm oil). The modified PVDF/SiO2 showed high permeate flux which is nearly four times of the permeate flux of neat PVDF membrane, but still susceptible of salt and oil fouling as shown in SEM images.

Nano Composite Membranes of Sulfonated Poly(2,6-Dimethyl-1,4-Phenylene Oxide)/Poly(2,6-Diphenyl-1,4-Phenylene Oxide) Copolymer and SiO2 for Fuel Cell Application

2007 ◽  
Vol 26-28 ◽  
pp. 835-838 ◽  
Author(s):  
Young Gi Jeong ◽  
Hye Seok Park ◽  
Dong Wan Seo ◽  
Seung Woo Choi ◽  
Whan Gi Kim
Keyword(s):  
Chlorosulfonic Acid ◽  
Composite Membranes ◽  
Sio2 Nanoparticles ◽  
Scanning Calorimetry ◽  
Nano Composite ◽  
Acid Copolymer ◽  
Phenylene Oxide ◽  
20 Nm ◽  
Sulfonated Poly ◽  
Dimethyl Phenol

The Sulfonated poly(2,6-dimethyl-1,4-phenylene oxide) / poly(2,6-diphenyl-1,4-phenylene oxide) (S-PPO) was prepared by oxidative coupling polymerization with 2,6-dimethyl phenol, 2,6-diphenyl phenol, CuCl(І) and pyridine, and followed sulfonation with chlorosulfonic acid. Copolymer was consisted of 2,6-diphenyl phenol 30 mol% and 2,6-dimethyl phenol 70 mol%. Organic-inorganic nano composite membranes were prepared with copolymer and a series of SiO2 nanoparticles (20 nm, 4, 7 and 10 wt%). The composite membranes were cast from dimethylsulfoxide solution. The membranes were studied by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Sorption experiments were conducted to observe the interaction of sulfonated polymers with water and methanol. S-PPO copolymer and nano composite membranes exhibited proton conductivities from 0.79×10-3 to 0.98×10-3 S/cm, water uptake from 21.70 to 24.77 %, IEC from 0.720 to 0.955 meq/g and methanol diffusion coefficients from 2.97×10-7 to 3.70×10-7 cm2/S.

BaxSr1−xO/MgO nano-composite sorbents for tuning the transition pressure of oxygen: Application to air separation

2015 ◽  
Vol 137 ◽  
pp. 532-540 ◽  
Author(s):  
Taesung Jung ◽  
Jeong-Geol Na ◽  
Dong Woo Cho ◽  
Jong-Ho Park ◽  
Ralph. T. Yang
Keyword(s):  
Air Separation ◽  
Nano Composite ◽  
Transition Pressure ◽  
Composite Sorbents

Performance of Polyphenylsulfone-based Solvent Resistant Nanofiltration Membranes in Removing Dyes from Methanol Solution

2014 ◽  
Vol 70 (2) ◽  
Author(s):  
N. A. A. Sani ◽  
W. J. Lau ◽  
A. F. Ismail
Keyword(s):  
Phase Inversion ◽  
Membrane Separation ◽  
Polymer Concentration ◽  
Inversion Method ◽  
Separation Performance ◽  
Permeate Flux ◽  
Filtration Time ◽  
Pure Methanol ◽  
Dye Rejection ◽  
Phase Inversion Method

In this study, polyphenylsulfone (PPSU) which is a third member of the polysulfone (PSF) family, with even better properties than PSF and polyethersulfone (PES) was used to prepare flat sheet solvent resistant nanofiltration (SRNF) membranes. The SRNF membranes were prepared from different PPSU concentrations (i.e. 17, 21 and 25 wt%) via phase inversion method. The performance of membranes was then evaluated by measuring the methanol flux and rejection against dyes of different molecular weight (MW) dissolved in methanol. The study revealed that the membrane with the lowest polymer concentration produced the highest pure methanol flux and required the longest time to achieve steady-state owing to its porous structure. Results also showed that the flux of the membranes tended to decrease with filtration time due to the membrane compaction. With respect to the membrane separation performance, it was found that the membrane dye rejection increased while permeate flux decreased with increasing the MW of dye components from 269 to 1470 g/mol, irrespective of the polymer concentration. Furthermore, the membrane MWCO was found to change with polymer concentration in which an increase in polymer concentration led to a lower membrane MWCO.

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