ISSN 1995-4301

ISSN 2618-8406

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2 issue of the journal in 2022

1 issue of the journal in 2022

4 issue of the journal in 2021

3 issue of the journal in 2021

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“Green” fabrication of poly (vinylidene fluoride) membranes for microfiltration

E.S. Shirokova, P.A. Sozinov, V.A. Cherepanova, O.V. El’kin, S.V. Fomin, D.A. Kozulin, A.N. Bushuev, I.V. Tolstobrov, I.S. Kraeva
Section: Methodology and research methods. Models and forecasts
Membrane technology is a crucial tool toward technological process intensification in chemical industry. In addition to its undeniable contribution to desalination and reuse of water, the spread of separation applications in industry could save great part of the energy. Beyond the contribution to the environmental and economic improvement of separation processes, the membrane manufacturing industry itself needs to minimize environmental and occupational risks, that means meet principles of “green” chemistry. Membrane manufacturing should be developed with the reduction or elimination of hazardous compounds. The chemical processes of membrane production are linked with the use of a wide range of solvents. A lot of organic solvents required for membrane production are classified as toxic or hazardous substances and their use is strictly limited by law. One of the promising environmentally friendly methods of production of membranes is the applying of “green” solvents. As an alternative technology, it is proposed to use the freeze method, in which non-toxic dimethyl sulfoxide (DMSO) is used as a solvent. This technology requires less energy consumption, which also allows implementing the principles of “green” chemistry. Microporous membranes based on poly(vinylidene fluoride) (PVDF) with a thickness of 100 to 250 μm was carried out by freeze method. Dimethylsulfoxide (DMSO) was selected as the most environmentally friendly solvent for some fluoropolymers. Porosity, permeability, wettability, physical and mechanical characteristics for obtained membranes and their morphology were investigated. It has been found that the most optimal concentration of PVDF in the solution is 30 wt.%. In this case the best combination of technological and operational properties is provided. The efficiency of prepared membranes for microfiltration process was demonstrated by a suspension of the yeast Saccharomyces cerevisiae. Such technology in comparison with the existing ones, is devoid of some disadvantages like using of complex equipment and high operating temperature. Freeze method does not require high energy consumption and using of toxic solvents.
Keywords: “green” chemistry, microfiltration, membranes, poly(vinylidene fluoride), freeze method
Article published in number 4 for 2021
DOI: 10.25750/1995-4301-2021-4-064-070
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The journal was founded in 2007