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Studies of a mixing process induced by a rotating magnetic field with the application of magnetic particles

Rakoczy Rafał, Kordas Marian, Markowska-Szczupak Agata, Konopacki Maciej, Augustyniak Adrian, Jabłońska Joanna, Paszkiewicz Oliwia, Dubrowska Kamila, Story Grzegorz, Story Anna, Ziętarska Katarzyna, Sołoducha Dawid, Borowski Tomasz, Roszak Marta, Grygorcewicz Bartłomiej, Dołęgowska Barbara

Chemical and Process Engineering

2021

Vol. 42, nr 2

157-–172

We demonstrate in this study that a rotating magnetic field (RMF) and spinning magnetic particles using this kind of magnetic field give rise to a motion mechanism capable of triggering mixing effect in liquids. In this experimental work two mixing mechanisms were used, magnetohydrodynamics due to the Lorentz force and mixing due to magnetic particles under the action of RMF, acted upon by the Kelvin force. To evidence these mechanisms, we report mixing time measured during the neutralization process (weak acid-strong base) under the action of RMF with and without magnetic particles. The efficiency of the mixing process was enhanced by a maximum of 6.5% and 12.8% owing to the application of RMF and the synergistic effect of magnetic field and magnetic particles, respectively

Badania antybakteryjnych właściwości komercyjnych fotokalizatorów TiO2

Paszkiewicz Oliwia, Markowska-Szczupak Agata

Przemysł Chemiczny

2019

T. 98, nr 11

1832--1836

Zbadano antybakteryjne właściwości czterech komercyjnych fotokatalizatorów opartych na ditlenku tytanu, o różnym składzie fazowym. W badaniach prowadzonych w obecności promieniowania UVA i UV-Vis oraz w ciemności stosowano bakterie Gram-ujemne Escherichia coli i Gram-dodatnie Staphylococcus epidermidis. Lepszą skuteczność dezynfekcji wykazywały nanofotokatalizatory zawierające w składzie więcej anatazu. Żaden z testowanych fotokatalizatorów nie wykazywał właściwości bakteriostatycznych w ciemności.

Four com. TiO₂ photocatalysts were studied for antibacterial activity against Gram-negative Escherichia coli and Grampositive Staphylococcus epidermidis bacteria. Efficient photocatalytic disinfection of water was achieved by using 2 of the catalyst under UV-Vis radiation. None of the tested photocatalysts showed bacteriostatic properties in dark.

The study of glycerol-based fermentation and broth downstream by nanofiltration

Gryta Marek, Markowska-Szczupak Agata, Grzechulska-Damszel Joanna, Bastrzyk Justyna, Waszak Marta

Polish Journal of Chemical Technology

2014

Vol. 16, nr 4

117--122

In this work, the glycerol fermentation was carried out using Citrobacter freundii bacteria. The influence of glycerol and metabolites concentrations, and the pH changes on the efficiency of 1,3-propanediol production, during batch and fed-batch processes, was presented. The nanofiltration was used for the separation of obtained post-fermentation solutions. The resulted 1,3-PD solutions were significantly desalted, which may facilitate further downstream processes during 1,3-PD production.