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Modelling of selective retention of Cd-Ni ions from aqueous solutions by polymer enhanced ultrafiltration

Can Muhammed F., Arslan Fatma, Çelik Mehmet S.

Physicochemical Problems of Mineral Processing

2022

Vol. 58, iss. 5

art. no. 151913

Polymer enhanced ultrafiltration (PEUF) technique economically enables separation and/or retention of various heavy metal ions from aqueous solutions for environmental and engineering problems. Polyethylenimine as the water-soluble complexation agent utilized to interact with heavy metal ions of Cd and Ni as cations in ultrafiltration experiments were modeled with protonation data to understand the mechanism. Test runs showed that an enrichment coefficient (the ratio of Cd over Ni in permeate) up to 10 was obtained at pH 4.2 in the temperature range of 20-22oC, whereas full retention of both cations is possible above pH 5.0 and those results are highly compatible with the model developed.

Synthesis and antibacterial properties of quaternary ammonium derivative of polyethylenimine

Kwolek U., Wójcik K., Janiczek M., Nowakowska M., Kepczynski M.

Polimery

2017

T. 62, nr 4

311--316

The quaternary derivative of branched polyethylenimine (bPEI-met) was synthesized and its antibacterial activity against Gram-positive bacterium (Staphylococcus aureus) and Gram-negative bacterium (Escherichia coli) was studied. The values of minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of bPEI-met against mentioned bacteria were determined. These indicated that bPEI-met could be considered as an effective alternative to antibiotics for the treatment of selected bacterial strains. The results obtained can be useful in search for drugs allowing treatment of antibiotic resistant bacterial strains.

Zsyntetyzowano czwartorzędową amoniową pochodną rozgałęzionej polietylenoiminy (bPEI-met) i badano jej działanie antybakteryjne przeciwko bakteriom Gram-dodatnim na przykładzie gronkowca złocistego (Staphylococcus aureus) i Gram-ujemnym na przykładzie pałeczki okrężnicy (Escherichia coli). Wyznaczono wartości minimalnego stężenia hamującego (MIC) i minimalnego stężenia bakteriobójczego (MBC) bPEI-met w stosunku do obu wymienionych szczepów bakterii. Wyniki tych badań sugerują, że bPEI-met może być rozważana jako alternatywa dla antybiotyków w zwalczaniu wybranych szczepów bakterii, szczególnie tych, które charakteryzują się antybiotykoopornością.

Influence of polyethylenimine on the electrophoretic deposition of SiO2 and Ni/SiO2 coatings on 316L stainless steel

Ratajski T., Kalemba-Rec I., Dubiel B.

Inżynieria Materiałowa

2016

Vol. 37, nr 4

184--189

The aim of the present work was to investigate the influence of polyethylenimine, a cationic polymer surfactant, on the microstructure and corrosion resistance of SiO2 and Ni/SiO2 coatings electrophoretically deposited on 316L stainless steel. The relationship between zeta potential and pH of the ethanol-based suspensions of SiO2 and Ni powder particles with addition of polyethylenimine was determined. The parameters of electrophoretic deposition process (applied voltage, time, distance between electrodes) were developed to prepare good quality coatings. Cathodophoresis from suspensions with polyethylenimine addition was performed with slightly lower applied voltage and time as compared to anodic deposition of coatings without surfactant. The microstructure of the coatings, their surface roughness and adhesion to the substrate were investigated. The protective behaviour of the coatings was studied by potentiodynamic measurements in 3.5% NaCl water solution. The microstructure and properties of the coatings were compared with those obtained without polyethylenimine addition. It was determined that the microstructure of SiO2 and Ni/SiO2 coatings deposited from suspensions containing polyethylenimine was more uniform and contained smaller amount of cracks and voids than the coatings achieved without polyelectrolyte. It was also observed that the quality improvement of the coatings deposited on 316L steel due to addition of polyelectrolyte with binding properties leads to increase of their corrosion resistance.

Celem pracy było zbadanie wpływu polietylenoiminy (PEI) na stabilność zawiesin na bazie etanolu używanych do osadzania elektroforetycznego (EPD) powłok SiO2 i nanokompozytowych powłok Ni/SiO2 na stali 316L. Zbadano mikrostrukturę powłok oraz topografię powierzchni, przyczepność do podłoża i odporność na korozję w 3,5% roztworze NaCl.