scholarly journals Preparation and properties of cellulose membranes with graphene oxide addition

2017 ◽  
Vol 19 (4) ◽  
pp. 41-49 ◽  
Author(s):  
Beata Fryczkowska ◽  
Kamil Wiechniak
Keyword(s):  
Graphene Oxide ◽  
Phase Inversion ◽  
Chemical Properties ◽  
Composite Membranes ◽  
Inversion Method ◽  
Permeate Flux ◽  
Oxide Addition ◽  
Physico Chemical ◽  
Cellulose Membranes ◽  
Phase Inversion Method

Abstract The paper presents results of research on the preparation of cellulose membranes with graphite oxide addition (GO/CEL). Initially, a cellulose (CEL) solution in 1-ethyl-3-methylimidazole acetate (EMIMAc) was obtained, to which graphene oxide (GO) dispersed in N,N-dimethylformamide (DMF) was added. From this solution, composite membranes were formed using phase inversion method. It was observed that the GO addition influences the physico-chemical properties of GO/CEL composite membranes, resulting in an increase in their mass per unit area, thickness and density, and a decrease in sorption properties. In addition, the study of transport properties has shown that GO/CEL membranes do not absorb BSA particles on their surface, which prevents the unfavorable phenomenon of fouling. An important feature of the obtained membranes is the specific permeate flux which reaches high values (~124 L/m2×h) at 3.8% of the GO addition to the cellulose matrix.

scholarly journals Synthesis and performance of antifouling and self-cleaning polyethersulfone/graphene oxide composite membrane functionalized with photoactive semiconductor catalyst

2016 ◽  
Vol 75 (3) ◽  
pp. 670-685 ◽  
Author(s):  
Nadir Dizge ◽  
Hakan Gonuldas ◽  
Yasin Ozay ◽  
Hasan Ates ◽  
Kasim Ocakoglu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Sol Gel ◽  
Composite Membranes ◽  
Graphite Powder ◽  
Inversion Method ◽  
Functionalized Membranes ◽  
Self Cleaning ◽  
And Performance ◽  
Pes Membrane ◽  
Phase Inversion Method

This study was performed to synthesize membranes of polyethersulfone (PES) blended with graphene oxide (GO) and PES blended with GO functionalized with photoactive semiconductor catalyst (TiO2 and ZnO). The antifouling and self-cleaning properties of composite membranes were also investigated. The GO was prepared from natural graphite powder by oxidation method at low temperature. TiO2 and ZnO nanopowders were synthesized by anhydrous sol–gel method. The surface of TiO2 and ZnO nanopowders was modified by a surfactant (myristic acid) to obtain a homogeneously dispersed mixture in a solvent, and then GO was functionalized by loading with these metal oxide nanopowders. The PES membranes blended with GO and functionalized GO into the casting solution were prepared via phase inversion method and tested for their antifouling as well as self-cleaning properties. The composite membranes were synthesized as 14%wt. of PES polymer with three different concentrations (0.5, 1.0, and 2.0%wt.) of GO, GO-TiO2, and GO-ZnO. The functionalization of membranes improved hydrophilicity property of membranes as compared to neat PES membrane. However, the lowest flux was obtained by functionalized membranes with GO-TiO2. The results showed that functionalized membranes demonstrated better self-cleaning property than neat PES membrane. Moreover, the flux recovery rate of functionalized membranes over five cycles was higher than that of neat membrane.

scholarly journals Investigating the Antibacterial Activity of Polymeric Membranes Fabricated with Aminated Graphene Oxide

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 510
Author(s):  
Muhammad Zahid ◽  
Saba Akram ◽  
Anum Rashid ◽  
Zulfiqar Ahmad Rehan ◽  
Talha Javed ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Graphene Oxide ◽  
Mechanical Stability ◽  
Water Flux ◽  
Composite Membranes ◽  
Inversion Method ◽  
Cellulose Acetate Membrane ◽  
Functionalized Graphene Oxide ◽  
And Performance ◽  
Phase Inversion Method

A novel, functionalized graphene oxide–based cellulose acetate membrane was fabricated using the phase inversion method to improve the membrane characteristics and performance. We studied the effect of aminated graphene oxide (NH2–GO) composite on the CA membrane characteristics and performance in terms of membrane chemistry, hydrophilicity, thermal and mechanical stability, permeation flux, and antibacterial activity. The results of contact angle and water flux indicate the improved hydrophilic behavior of composite membranes in comparison to that of the pure CA membrane. The AGO-3 membrane showed the highest water flux of about 153 Lm−2h−1. The addition of hydrophilic AGO additive in CA membranes enhanced the antibacterial activity of AGO–CA membranes, and the thermal stability of the resulting membrane also improved since it increases the Tg value in comparison to that of a pristine CA membrane. The aminated graphene oxide (NH2–GO) was, therefore, found to be a promising additive for the fabrication of composite membranes with potent applications in wastewater treatment.

scholarly journals Properties and Structure of Cellulosic Membranes Obtained from Solutions in Ionic Liquids Coagulated in Primary Alcohols

2018 ◽  
Vol 18 (3) ◽  
pp. 232-242
Author(s):  
Beata Fryczkowska ◽  
Małgorzata Kowalska ◽  
Dorota Biniaś ◽  
Czesław Ślusarczyk ◽  
Jarosław Janicki ◽  
...  
Keyword(s):  
Cross Sections ◽  
Phase Inversion ◽  
Composite Membranes ◽  
Skin Layer ◽  
The Other ◽  
Inversion Method ◽  
Primary Alcohols ◽  
Membrane Surfaces ◽  
Phase Inversion Method ◽  
Scanning Electron

Abstract This paper presents the results of studies on the preparation of cellulosic membranes, from a solution in 1-ethyl-3- methylimidazolium acetate (EMIMAc), using the phase inversion method. Initially, the membranes were obtained by coagulation of the polymer film in water and primary alcohols (methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol), 1-hexanol, 1-octanol) resulting in membranes with significantly differing morphologies. Subsequently, composite membranes were produced, with the support layer being a membrane with the largest pores, and the skin layer a membrane with smaller pores. The resulting membranes were tested for physicochemical and transport properties. The morphology of the membrane surfaces and their cross-sections were investigated by using a scanning electron microscope (SEM). The structure of the membranes, on the other hand, was investigated by FTIR spectroscopy and WAXS structural analysis.

Hemodialysis Membrane Prepared from Bacterial Cellulose/Lithium Chloride/N,N-Dimethylacetamide Solution

2014 ◽  
Vol 1048 ◽  
pp. 395-399 ◽  
Author(s):  
Jia Zhi Yang ◽  
Guang Mei Liu ◽  
Dong Ping Sun
Keyword(s):  
Tensile Strength ◽  
Bacterial Cellulose ◽  
Phase Inversion ◽  
Inversion Method ◽  
Regenerated Cellulose ◽  
Vitamin B ◽  
Cellulose Membrane ◽  
Cellulose Membranes ◽  
Phase Inversion Method ◽  
Percentage Porosity

A new bacterial cellulose regenerated cellulose membrane (RBC) has been prepared by phase inversion method in LiCl/DMAC solution. The effects of coagulation concentrations on the physical properties of the RBC membranes were studied and optimized. Features of the RBC of membranes obtained using 0%~40% N,N-Dimethylacetamide (DMAC), such as water absorption percentage, porosity (Pr), ultrafilter rate (UFR), and tensile strength were investigated. The RBC membranes prepared with 40% DMAC solution as coagulant exhibit a smooth surface and a high tensile strength with suitable UFR. RBC showed improved permeabilities for urea and vitamin B12when compared with commercial cellulose membranes.

scholarly journals Modifications of polyethersulfone membrane by doping sulfated-TiO2 nanoparticles for improving anti-fouling property in wastewater treatment

RSC Advances ◽  
2017 ◽  
Vol 7 (54) ◽  
pp. 33822-33828 ◽  
Author(s):  
Jing Guo ◽  
Jeonghwan Kim
Keyword(s):  
Wastewater Treatment ◽  
Tio2 Nanoparticles ◽  
Phase Inversion ◽  
Composite Membranes ◽  
Inversion Method ◽  
Polyethersulfone Membrane ◽  
Sulfated Tio2 ◽  
Phase Inversion Method

Polyethersulfone (PES) composite membranes mixed with sulfated-TiO2 nanoparticles were fabricated using a non-solvent induced phase inversion method.

scholarly journals The Influence of Graphene Addition on the Properties of Composite rGO/PAN Membranes and Their Potential Application for Water Disinfection

Membranes ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 58 ◽  
Author(s):  
Beata Fryczkowska ◽  
Alicja Machnicka ◽  
Dorota Biniaś ◽  
Czesław Ślusarczyk ◽  
Janusz Fabia
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Composite Membranes ◽  
Water Disinfection ◽  
Inversion Method ◽  
Protein Retention ◽  
Reduced Graphene ◽  
Phase Inversion Method ◽  
High Degree ◽  
The Impact

The paper presents a method of obtaining composite polyacrylonitrile-based (PAN) membranes with the addition of reduced graphene oxide (rGO). The membranes were obtained using phase inversion method from a homogeneous rGO dispersion in a solution of PAN dissolved in N, N-dimethylformamide (DMF). The impact of the amount of rGO addition to the PAN matrix on the physicochemical, structural, transport, and separation properties and on fouling resistance was studied. Composite membranes, due to the method of preparation used and the addition of rGO, are characterized by very good transport properties (~390 L/m2 h) and by a high degree of protein retention (85%). Reduced graphene oxide has biocidal properties, which, as we have shown, depend on the size of nanoparticles and the type of microorganism. rGO/PAN membranes, on the other hand, show biostatic properties against Gram-negative bacteria (Escherichia coli), Gram-positive bacteria (Staphylococcuc aureus) and fungi (Candida albicans). Thus, the obtained composite membranes can be potentially used in water disinfection.

scholarly journals Use of Silica Gel from Volcanic Ash as Chitosan Composite Membrane’s Filler

2019 ◽  
Vol 31 (10) ◽  
pp. 2303-2305
Author(s):  
Maulida Lubis ◽  
Lilis Sukeksi ◽  
Mara Bangun Harahap ◽  
Melva Ginting ◽  
Herlinawati Wici ◽  
...  
Keyword(s):  
Water Absorption ◽  
Silica Gel ◽  
Composite Membrane ◽  
Phase Inversion ◽  
Volcanic Ash ◽  
Composite Membranes ◽  
Inversion Method ◽  
Stirring Time ◽  
Phase Inversion Method ◽  
Chitosan Composite

This study aims to determine the process of making composite membranes of chitosan and silica fillers from volcanic ash of Sinabung mountain and determine the physical properties of chitosan composite membranes viz. degree of water absorption, functional groups. In this study, composite membranes were made using phase inversion method with the composition of chitosan and silica used were 2 g of chitosan and variations in dosage of fillers 0.6, 0.9 and 1.2 g of silica, while the stirring time was 8, 12 and 16 h. Based on the results , the best membrane conditions were obtained from composite membrane analysis with the best conditions of composite membranes at water absorption is 44.58 %. From the results of FTIR analysis, indicated the presence of OH bonds and Si-O-Si bonds on composite membranes caused by silica gel characteristics of composite membranes also supported by EDX analysis showed composite membrane contained carbon 55.17 %, oxygen 20.36 % and silicon 10.42 %.

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.

scholarly journals Graphene Oxide-PES-Based Mixed Matrix Membranes for Controllable Antibacterial Activity against Salmonella typhi and Water Treatment

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Haleema Tariq Bhatti ◽  
Nasir M. Ahmad ◽  
Muhammad Bilal Khan Niazi ◽  
Muhammad Azeem Ur Rehman Alvi ◽  
Naveed Ahmad ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Graphene Oxide ◽  
Composite Membranes ◽  
Salmonella Typhi ◽  
Mixed Matrix Membranes ◽  
Inversion Method ◽  
Hydroxyl Groups ◽  
Mixed Matrix ◽  
Good Potential ◽  
Phase Inversion Method

The present work is focused on preparation, characterization, and antibacterial activity evaluation of graphene oxide/polyethersulfone mixed matrix filtration membranes. Graphene oxide (GO) was synthesized via improved Hummer’s method and characterized by XRD, FTIR, and SEM. FT-IR spectra showed the presence of carboxylic acid and hydroxyl groups on GO nanosheets. Different concentrations of the synthesized GO at 0.25, 0.5, and 1.0 wt. % were incorporated in polyethersulfone (PES) matrix via phase inversion method to fabricate GO-PES membranes. Increasing porosity and formation of wider, finger-like channels were observed with increased GO concentrations relative to pristine membranes as evident from scanning electron microscopy (SEM) micrographs of the fabricated membranes. However, membranes prepared with 1 wt. % GO appear to contain aggregation and narrowing of pore morphology. GO-incorporated membranes demonstrated enhanced flux, water-retaining capacities, and wettability as compared to pristine PES membranes. Shake flask and colony counting methods were employed to carry out antibacterial testing of synthesized GO and fabricated GO-PES membranes against Salmonella typhi (S. typhi)—a gram-negative bacteria present in water that is known as causative agent of typhoid. Synthesized GO showed significant reduction up to 70.8% in S. typhi cell count. In the case of fabricated membranes, variable concentrations of GO are observed to significantly influence the percentage viability of S. typhi, with reduction percentages observed at 41, 60, and 69% for 0.25, 0.5, and 1.0 wt. % GO-incorporated membranes relative to 17% in the case of pristine PES membranes. The results indicate a good potential for applying GO/PES composite membranes for water filtration application.

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