scholarly journals High-Throughput Microfiltration Membranes with Natural Biofouling Reducer Agent for Food Processing

Processes ◽  
2018 ◽  
Vol 7 (1) ◽  
pp. 1 ◽  
Author(s):  
Panggulu Utoro ◽  
Agung Sukoyo ◽  
Sandra Sandra ◽  
Nimatul Izza ◽  
Shinta Dewi ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
High Throughput ◽  
Water Flux ◽  
Antibacterial Properties ◽  
Mixed Matrix Membranes ◽  
Bacterial Cells ◽  
E Coli ◽  
Membrane Surfaces ◽  
Cellulose Acetate Membranes ◽  
Microfiltration Membranes

The effect of natural antibiotics Moringa oleifera seeds powder in cellulose acetate membranes as biofouling reducer agent was investigated. Mixed matrix membranes (MMM) were synthesized by adding 100 mesh M. oleifera seeds powder with variation of three concentrations (1 wt%, 2 wt%, and 3 wt%), into a mix polymer solution of CA (cellulose acetate) and two different solvents, i.e., DMF (dimethylformamide) and DMAc (dimethylacetamide). The synthesized membranes morphology was observed under scanning electron microscopy and from the images can be seen that the membranes made of DMAc formed rather large macrovoid as compared to DMF-based membranes. The microstructure affected the water flux through the membranes, in which the DMAc membranes provided a higher flux value and served as high-throughput microfiltration membranes. Antibacterial properties of MMM were tested using Escherichia coli adhesion onto membrane surfaces. The results showed that M. oleifera has been proven to eradicate E. coli activity on the membrane surfaces due to interaction between bacterial cells and phenolic compounds from M. oleifera, through absorption processes involving hydrogen bonds.

Effect of the structure of cellulose acetate membranes on their permeability, electrical conductivity and rejection

1990 ◽  
Vol 55 (12) ◽  
pp. 2933-2939 ◽  
Author(s):  
Hans-Hartmut Schwarz ◽  
Vlastimil Kůdela ◽  
Klaus Richau
Keyword(s):  
Electrical Conductivity ◽  
Electrical Properties ◽  
Cellulose Acetate ◽  
Reverse Osmosis ◽  
Water Flux ◽  
Cellulose Acetate Membrane ◽  
Structure Parameters ◽  
Dc Electrical Conductivity ◽  
Cellulose Acetate Membranes

Ultrafiltration cellulose acetate membrane can be transformed by annealing into reverse osmosis membranes (RO type). Annealing brings about changes in structural properties of the membranes, accompanied by changes in their permeability behaviour and electrical properties. Correlations between structure parameters and electrochemical properties are shown for the temperature range 20-90 °C. Relations have been derived which explain the role played by the dc electrical conductivity in the characterization of rejection ability of the membranes in the reverse osmosis, i.e. rRO = (1 + exp (A-B))-1, where exp A and exp B are statistically significant correlation functions of electrical conductivity and salt permeation, or of electrical conductivity and water flux through the membrane, respectively.

scholarly journals Green Synthesis and Incorporation of Sericin Silver Nanoclusters into Electrospun Ultrafine Cellulose Acetate Fibers for Anti-Bacterial Applications

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1411
Author(s):  
Mujahid Mehdi ◽  
Huihui Qiu ◽  
Bing Dai ◽  
Raja Fahad Qureshi ◽  
Sadam Hussain ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Green Synthesis ◽  
Cellulose Acetate ◽  
Antibacterial Properties ◽  
Vital Role ◽  
Silver Nanoclusters ◽  
Composite Fibers ◽  
E Coli ◽  
Antibacterial Performance ◽  
Field Emission Electron Microscopy

Fiber based antibacterial materials have gained an enormous attraction for the researchers in these days. In this study, a novel Sericin Encapsulated Silver Nanoclusters (sericin-AgNCs) were synthesized through single pot and green synthesis route. Subsequently these sericin-AgNCs were incorporated into ultrafine electrospun cellulose acetate (CA) fibers for assessing the antibacterial performance. The physicochemical properties of sericin-AgNCs/CA composite fibers were investigated by transmission electron microscopy (TEM), field emission electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FTIR) and wide X-ray diffraction (XRD). The antibacterial properties of sericin-AgNCs/CA composite fibers against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) were systematically evaluated. The results showed that sericin-AgNCs incorporated in ultrafine CA fibers have played a vital role for antibacterial activity. An amount of 0.17 mg/mL sericin-AgNCs to CA fibers showed more than 90% results and elevated upto >99.9% with 1.7 mg/mL of sericin-AgNCs against E. coli. The study indicated that sericin-AgNCs/CA composite confirms an enhanced antibacterial efficiency, which could be used as a promising antibacterial product.

scholarly journals Functional Modification of Cellulose Acetate Microfiltration Membranes by Supercritical Solvent Impregnation

Molecules ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 411
Author(s):  
Irena Zizovic ◽  
Marcin Tyrka ◽  
Konrad Matyja ◽  
Ivana Moric ◽  
Lidija Senerovic ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Ion Beam ◽  
Antibacterial Properties ◽  
Cross Flow ◽  
Batch Mode ◽  
Impregnation Process ◽  
Supercritical Solvent ◽  
Cross Flow Filtration ◽  
Microfiltration Membranes ◽  
The Impact

This study investigates the modification of commercial cellulose acetate microfiltration membranes by supercritical solvent impregnation with thymol to provide them with antibacterial properties. The impregnation process was conducted in a batch mode, and the effect of pressure and processing time on thymol loading was followed. The impact of the modification on the membrane’s microstructure was analyzed using scanning electron and ion-beam microscopy, and membranes’ functionality was tested in a cross-flow filtration system. The antibiofilm properties of the obtained materials were studied against Staphyloccocus aureus and Pseudomonas aeruginosa, while membranes’ blocking in contact with bacteria was examined for S. aureus and Escherichia coli. The results revealed a fast impregnation process with high thymol loadings achievable after just 0.5 h at 15 MPa and 20 MPa. The presence of 20% of thymol provided strong antibiofilm properties against the tested strains without affecting the membrane’s functionality. The study showed that these strong antibacterial properties could be implemented to the commercial membranes’ defined polymeric structure in a short and environmentally friendly process.

scholarly journals INCORPORATION OF IMPRINTED-ZEOLITE TO POLYETHERSULFONE/CELLULOSE ACETATE MEMBRANE FOR CREATININE REMOVAL IN HEMODIALYSIS TREATMENT

2019 ◽  
Vol 81 (3) ◽  
Author(s):  
Yanuardi Raharjo ◽  
Mochamad Zakki Fahmi ◽  
Siti Wafiroh ◽  
Alfa Akustia Widati ◽  
Eviomitta Rizki Amanda ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Pure Water ◽  
Water Flux ◽  
Hollow Fibre ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix Membrane ◽  
Cellulose Acetate Membrane ◽  
Zeolite A ◽  
Mixed Matrix ◽  
Water Contact

Polyethersulfon (PES) membrane has been widely used in the biomedical field especially in hemodialysis application. Many modifications of membranes have been applied into hemodialysis such as diffusion, adsorption, and mixed-matrix membrane. The main problem of those membranes is less selectivity to attract the uremic toxins. In this study, we report the modification of PES mixed with cellulose acetate (PES/CA) membrane as mixed-matrix membrane (MMM) using imprinted-zeolite (PES/CA/IZC) in order to increase the selectivity for targeted analyte. The hollow fibre membranes (HFM) were fabricated by dry-wet spinning technique. The successful zeolite A synthesised and was characterised by x-ray diffraction (XRD). The mixed-matrix membranes were characterised in terms of morphology using scanning electron microscopy (SEM), water contact angle (WCA), pure water flux (PWF), clearance of creatinine (CC), and BSA adsorption. In accordance with the results of characterisation, the synthesis of zeolite A, and imprinted-zeolite creatinine was successfully fabricated. The SEM results showed that the PES/CA/IZC membrane has uniform pores and fingerlike structure. The same result was obtained for PES/CA membrane, but not for PES/CA/ZA membrane. The WCA of the PES/CA; PES/CA/ZA; and PES/CA/IZC were 85.63; 84.98; and 77.53 (o), respectively. While the PWF were 22.84; 27.57, and 40.52 (Lm-2h-1), respectively. The addition of imprinted-zeolite into the membrane improved creatinine removal up to 74.99%. It showed that PES/CA/IZC has succeeded in increasing the selectivity of membranes to attract the creatinine as target analyte. Compared to the PES/CA, the creatinine clearance of membranes improved and increased up to 5.2%. For protein rejection, the PES/CA/IZC rejected 79.05% of bovine serum albumin (BSA). Based on these results, it can be concluded that PES/CA/IZC can be considered as hemodialysis membranes.

Facile fouling resistant surface modification of microfiltration cellulose acetate membranes by using amino acid l-DOPA

2013 ◽  
Vol 68 (4) ◽  
pp. 901-908 ◽  
Author(s):  
Sara Azari ◽  
Linda Zou ◽  
Emile Cornelissen ◽  
Yasushito Mukai
Keyword(s):  
Surface Modification ◽  
Amino Acid ◽  
Cellulose Acetate ◽  
Membrane Filtration ◽  
Membrane Surface ◽  
Fouling Resistance ◽  
Widespread Application ◽  
Potential Measurement ◽  
Cellulose Acetate Membranes ◽  
Microfiltration Membranes

A major obstacle in the widespread application of microfiltration membranes in the wet separation processes such as wastewater treatment is the decline of permeates flux as a result of fouling. This study reports on the surface modification of cellulose acetate (CA) microfiltration membrane with amino acid l-3,4-dihydroxy-phenylalanine (l-DOPA) to improve fouling resistance of the membrane. The membrane surface was characterised using Fourier transform infrared spectroscopy (FTIR), water contact angle and zeta potential measurement. Porosity measurement showed a slight decrease in membrane porosity due to coating. Static adsorption experiments revealed an improved resistance of the modified membranes towards the adhesion of bovine serum albumin (BSA) as the model foulant. Dead end membrane filtration tests exhibited that the fouling resistance of the modified membranes was improved. However, the effect of the modification depended on the foulant solution concentration. It is concluded that l-DOPA modification is a convenient and non-destructive approach to enable low-BSA adhesion surface modification of CA microfiltration membranes. Nevertheless, the extent of fouling resistance improvement depends on the foulant concentration.

Enhanced water flux and bacterial resistance in cellulose acetate membranes with quaternary ammoniumpropylated polysilsesquioxane

Chemosphere ◽  
2021 ◽  
pp. 133144
Author(s):  
Ravi P. Pandey ◽  
Parashuram Kallem ◽  
P. Abdul Rasheed ◽  
Khaled A. Mahmoud ◽  
Fawzi Banat ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Bacterial Resistance ◽  
Water Flux ◽  
Cellulose Acetate Membranes

Antibacterial properties of PES/CuCl2 three-bore hollow fiber UF membrane

2012 ◽  
Vol 66 (4) ◽  
pp. 799-803 ◽  
Author(s):  
Jingchuan Dang ◽  
Yatao Zhang ◽  
Zhan Du ◽  
Haoqin Zhang ◽  
Jindun Liu
Keyword(s):  
Hollow Fiber ◽  
Phase Inversion ◽  
Water Flux ◽  
Antibacterial Properties ◽  
Water Soluble ◽  
Spatial Network ◽  
Membrane Material ◽  
E Coli ◽  
Good Antibacterial Activity ◽  
Uf Membranes

In this study, a three-bore polyethersulfone (PES) hollow fiber ultrafiltration (UF) membrane with antibacterial properties was prepared by phase inversion, using PES as the membrane material, N,N-dimethylacetamide (DMAC) as solvent, polyvinylpyrrolidone (PVP) and CuCl2 as additives. The effect of CuCl2 content on the water flux and rejection was studied and the antibacterial properties of PES hollow fiber UF membrane were also investigated. The water flux results indicated that the hydrophilic properties of PES UF membranes were improved after adding CuCl2. The rejection of PVA-50000 was expected to drop slightly but remain high above 96%. The membranes showed good antibacterial activity against Escherichia coli (E. coli) after adding CuCl2 and the antibacterial rate of PES/CuCl2 UF membranes was close to 100% after running for 48 h. PES hollow fiber UF membranes with antibacterial properties were prepared through the formation of the water-soluble PVP/Cu2+ complex with spatial network structure, which have good antibacterial and hydrophilic properties. Therefore, this study could provide an effective method for membrane antifouling.

scholarly journals Antibacterial Effect of Plant Resin Collected from Tetrigona apicalis (Smith, 1857) in Thung Salaeng Luang National Park, Phitsanulok

2017 ◽  
Vol 15 (8) ◽  
pp. 599-607
Author(s):  
Sathirapong KRAIKONGJIT ◽  
Touchkanin JONGJITVIMOL ◽  
Naklao MIANJINDA ◽  
Nutta SIRITHEP ◽  
Thodsaporn KAEWBOR ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
National Park ◽  
Stingless Bees ◽  
Antibacterial Properties ◽  
Total Phenolic ◽  
Bacterial Cells ◽  
Bacterial Strains ◽  
E Coli ◽  
Phenolic Contents ◽  
Two Samples

Tetrigona apicalis (Smith, 1857) is a common species of stingless bee found in lower northern Thailand. In previous studies, the propolis of stingless bees has been shown to have antibacterial properties, due to its chemically contained phenolic contents. The major component of propolis is resin. The purpose of this study, therefore, was to evaluate the antibacterial activities of crude resin extracts by disk diffusion and broth microdilution methods. We also determined the total phenolic contents using the Folin-Ciocalteau method and, to detect individual polyphenolic contents, we used the high performance liquid chromatographic method. Two samples of resin were collected from Thung Salaeng Luang National Park, Phitsanulok. The first sample was from fresh plants, which stingless bees used for nest construction. The second sample was taken from entrances of the bee’s nest. All samples were macerated in 30 % ethanol and incubated at room temperature for 14 days. The supernatants were filtered and ethanol residues then removed as ethanolic resin extracts (eREs). The antibacterial activity of the extracted resins against Staphylococcus aureus ATCC 25923, Escherichia coli ATCC 25922, and Pseudomonas aeruginosa ATCC 27853 was examined. The disks containing 9 and 14 mg of eREs produced obvious inhibition zones against S. aureus, but did not show zones against E. coli and P. aeruginosa. The minimum inhibitory concentrations (MICs) of the eREs against the bacterial strains tested were variously between 6 and 48 mg/ml, whereas the minimum bactericidal concentrations (MBCs) were from 12 to 48 mg/ml. The amount of the total phenolic compounds in the eREs from the fresh resin was 9,908 mg of pyrogallol equivalent (PGE) per kg of eREs, and from the nest entrances, 14,740 mg per kg. We also found that hydroquinin had the highest concentration in both extracts. In conclusion, the crude resin extracts demonstrated antibacterial properties against the S. aureus, E. coli, and P. aeruginosa strains tested. They also contained phenolic compounds which were active antibacterial agents. We have identified new and novel knowledge which can be used as preliminary data, leading to further, more detailed, investigation of the mechanistic action of the resin against bacterial cells.

scholarly journals CO2/CH4 and He/N2 Separation Properties and Water Permeability Valuation of Mixed Matrix MWCNTs-Based Cellulose Acetate Flat Sheet Membranes: A Study of the Optimization of the Filler Material Dispersion Method

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 280
Author(s):  
Tobias Esser ◽  
Tobias Wolf ◽  
Tim Schubert ◽  
Jan Benra ◽  
Stefan Forero ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Cellulose Acetate ◽  
Water Permeability ◽  
Filler Material ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Feed Concentration ◽  
Water Permeation ◽  
Cellulose Acetate Membranes ◽  
Matrix Membranes

The main scope of this work is to develop nano-carbon-based mixed matrix cellulose acetate membranes (MMMs) for the potential use in both gas and liquid separation processes. For this purpose, a variety of mixed matrix membranes, consisting of cellulose acetate (CA) polymer and carbon nanotubes as additive material were prepared, characterized, and tested. Multi-walled carbon nanotubes (MWCNTs) were used as filler material and diacetone alcohol (DAA) as solvent. The first main objective towards highly efficient composite membranes was the proper preparation of agglomerate-free MWCNTs dispersions. Rotor-stator system (RS) and ultrasonic sonotrode (USS) were used to achieve the nanofillers’ dispersion. In addition, the first results of the application of the three-roll mill (TRM) technology in the filler dispersion achieved were promising. The filler material, MWCNTs, was characterized by scanning electron microscopy (SEM) and liquid nitrogen (LN2) adsorption-desorption isotherms at 77 K. The derivatives CA-based mixed matrix membranes were characterized by tensile strength and water contact angle measurements, impedance spectroscopy, gas permeability/selectivity measurements, and water permeability tests. The studied membranes provide remarkable water permeation properties, 12–109 L/m2/h/bar, and also good separation factors of carbon dioxide and helium separations. Specifically, a separation factor of 87 for 10% He/N2 feed concentration and a selectivity value of 55.4 for 10% CO2/CH4 feed concentration were achieved.

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