scholarly journals Development of Antifouling Polysulfone Membranes by Synergistic Modification with Two Different Additives in Casting Solution and Coagulation Bath: Synperonic F108 and Polyacrylic Acid

Materials ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 359
Author(s):  
Katsiaryna S. Burts ◽  
Tatiana V. Plisko ◽  
Mikael Sjölin ◽  
Goncalo Rodrigues ◽  
Alexandr V. Bildyukevich ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Polyacrylic Acid ◽  
Process Water ◽  
Coagulation Bath ◽  
Interpolymer Complex ◽  
Polypropylene Glycol ◽  
Layer Surface ◽  
Membrane Modification ◽  
Selective Layer ◽  
Casting Solution

This study deals with the development of antifouling ultrafiltration membranes based on polysulfone (PSF) for wastewater treatment and the concentration and purification of hemicellulose and lignin in the pulp and paper industry. The efficient simple and reproducible technique of PSF membrane modification to increase antifouling performance by simultaneous addition of triblock copolymer polyethylene glycol-polypropylene glycol-polyethylene glycol (Synperonic F108, Mn =14 × 103 g mol−1) to the casting solution and addition of polyacrylic acid (PAA, Mn = 250 × 103 g mol−1) to the coagulation bath is proposed for the first time. The effect of the PAA concentration in the aqueous solution on the PSF/Synperonic F108 membrane structure, surface characteristics, performance, and antifouling stability was investigated. PAA concentrations were varied from 0.35 to 2.0 wt.%. Membrane composition, structure, and topology were investigated by Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and scanning electron microscopy (SEM). The addition of PAA into the coagulation bath was revealed to cause the formation of a thicker and denser selective layer with decreasing its pore size and porosity; according to the structural characterization, an interpolymer complex of the two additives was formed on the surface of the PSF membrane. Hydrophilicity of the membrane selective layer surface was shown to increase significantly. The selective layer surface charge was found to become more negative in comparison to the reference membrane. It was shown that PSF/Synperonic F108/PAA membranes are characterized by better antifouling performance in ultrafiltration of humic acid solution and thermomechanical pulp mill (ThMP) process water. Membrane modification with PAA results in higher ThMP process water flux, fouling recovery ratio, and hemicellulose and total lignin rejection compared to the reference PSF/Synperonic F108 membrane. This suggests the possibility of applying the developed membranes for hemicellulose concentration and purification.

scholarly journals The Singular Molecular Conformation of Humic Acids in Solution Influences Their Ability to Enhance Root Hydraulic Conductivity and Plant Growth

Molecules ◽  
2020 ◽  
Vol 26 (1) ◽  
pp. 3
Author(s):  
Maite Olaetxea ◽  
Veronica Mora ◽  
Roberto Baigorri ◽  
Angel M. Zamarreño ◽  
Jose M. García-Mina
Keyword(s):  
Polyethylene Glycol ◽  
Humic Acid ◽  
Hydraulic Conductivity ◽  
Plant Growth ◽  
Polyacrylic Acid ◽  
Molecular Conformation ◽  
Water Solution ◽  
Biological Effects ◽  
Root Hydraulic Conductivity ◽  
Molecular Systems

Some studies have reported that the capacity of humic substances to improve plant growth is dependent on their ability to increase root hydraulic conductivity. It was proposed that this effect is directly related to the structural conformation in solution of these substances. To study this hypothesis, the effects on root hydraulic conductivity and growth of cucumber plants of a sedimentary humic acid and two polymers—polyacrylic acid and polyethylene glycol—presenting a molecular conformation in water solution different from that of the humic acid have been studied. The results show that whereas the humic acid caused an increase in root hydraulic conductivity and plant growth, both the polyacrylic acid and the polyethylene glycol did not modify plant growth and caused a decrease in root hydraulic conductivity. These results can be explained by the different molecular conformation in water solution of the three molecular systems. The relationships between these biological effects and the molecular conformation of the three molecular systems in water solution are discussed.

Nanocellulose as Modifier for Hollow Fiber Ultrafiltration PSF Membranes

2019 ◽  
Vol 816 ◽  
pp. 238-243 ◽  
Author(s):  
Tatyana S. Anokhina ◽  
S.D. Bazhenov ◽  
Ilya L. Borisov ◽  
V.P. Vasilevsky ◽  
V.A. Vinokurov ◽  
...  
Keyword(s):  
Transport Properties ◽  
Hollow Fiber ◽  
Cellulose Nanofibrils ◽  
Membrane Modification ◽  
Selective Layer ◽  
Blue Dextran ◽  
First Time ◽  
Molding Solution

In the present work, a study was conducted for the first time on the modification of hollow fiber UF PSF membranes by cellulose nanofibrils. Two approaches to membrane modification were analyzed: 1) introduction of CNF into the molding solution; 2) additions of CNF to the internal coagulant. Analysis of the transport properties of the investigated membranes showed that the first approach allows increasing the porosity of hollow fiber PSF membranes, due to which the permeability increases from 82 to 287 l / m2 h bar compared to the original membranes. Rejection of dye Blue Dextran (MM = 69 kg / mole) is reduced by 20%. The addition of CNF to the outside coagulant led to the formation of not only the inside selective layer, but also the outer one, while the permeability increases 1.5 times, and the rejection of the dye also increases from 96 to 99%.

Soil Structuring in the Presence of the Chitosan–Polyacrylic Acid Interpolymer Complex

2020 ◽  
Vol 53 (12) ◽  
pp. 1773-1781
Author(s):  
L. K. Orazzhanova ◽  
Zh. S. Kassymova ◽  
B. Kh. Mussabayeva ◽  
A. N. Klivenko
Keyword(s):  
Polyacrylic Acid ◽  
Interpolymer Complex

Effect of Casting Solution Composition on Properties of PIM-1/PAN Thin Film Composite Membranes

2019 ◽  
Vol 816 ◽  
pp. 167-173 ◽  
Author(s):  
Maya N. Putintseva ◽  
Ilya L. Borisov ◽  
Alexey A. Yushkin ◽  
R.A. Kirk ◽  
P.M. Budd ◽  
...  
Keyword(s):  
Thin Film ◽  
Gas Separation ◽  
Composite Membranes ◽  
Solution Composition ◽  
Selective Layer ◽  
Film Composite ◽  
Uniform Layer ◽  
Thin Film Composite ◽  
Casting Solution

In this work, PIM-1 thin film composite membranes supported on PAN were developed. The influence of PIM-1 concentration and nature of solvent stabilizer on the structure and gas separation properties of TFC membranes were studied. It was shown that amylene stabilized chloroform as PIM-1 solvent allows membranes to be obtained with a uniform selective layer in the whole range of concentrations used, and the ethanol stabilized chloroform provides a uniform layer at 2 and 4 wt % PIM-1 concentration. The best CO2/N2 selectivities were 35,9 and 39,5 for 4 % wt PIM-1 solution in ethanol and amylene stabilized chloroform, respectively.

scholarly journals One-Step Preparation of Antifouling Polysulfone Ultrafiltration Membranes via Modification by a Cationic Polyelectrolyte Based on Polyacrylamide

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1017 ◽  
Author(s):  
Tatiana V. Plisko ◽  
Alexandr V. Bildyukevich ◽  
Katsiaryna S. Burts ◽  
Sergey S. Ermakov ◽  
Anastasia V. Penkova ◽  
...  
Keyword(s):  
Phase Separation ◽  
Human Serum Albumin ◽  
Zeta Potential ◽  
Serum Albumin ◽  
Human Serum ◽  
Cationic Polyelectrolyte ◽  
Coagulation Bath ◽  
Ultrafiltration Membranes ◽  
Selective Layer ◽  
One Step

A novel method for one-step preparation of antifouling ultrafiltration membranes via a non-solvent induced phase separation (NIPS) technique is proposed. It involves using aqueous 0.05–0.3 wt.% solutions of cationic polyelectrolyte based on a copolymer of acrylamide and 2-acryloxyethyltrimethylammonium chloride (Praestol 859) as a coagulant in NIPS. A systematic study of the effect of the cationic polyelectrolyte addition to the coagulant on the structure, performance and antifouling stability of polysulfone membranes was carried out. The methods for membrane characterization involved scanning electron microscopy (SEM), atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR), contact angle and zeta-potential measurements and evaluation of the permeability, rejection and antifouling performance in human serum albumin solution and surface water ultrafiltration. It was revealed that in the presence of cationic polyelectrolyte in the coagulation bath, its concentration has a major influence on the rate of “solvent–non-solvent” exchange and thus also on the rate of phase separation which significantly affects membrane structure. The immobilization of cationic polyelectrolyte macromolecules into the selective layer was confirmed by FTIR spectroscopy. It was revealed that polyelectrolyte macromolecules predominately immobilize on the surface of the selective layer and not on the bottom layer. Membrane modification was found to improve the hydrophilicity of the selective layer, to increase surface roughness and to change zeta-potential which yields the substantial improvement of membrane antifouling stability toward natural organic matter and human serum albumin.

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