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Polish Academy of Sciences

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Piotr Fita

University of Warsaw (PL)

Recent publications
1.  Mieldzioć P., Tymkiewicz R., Sołek J., Secomski W., Litniewski J., Fita P., Reaction kinetics of sonochemical oxidation of potassium hexacyanoferrate(II) in aqueous solutions, Ultrasonics Sonochemistry, ISSN: 1350-4177, DOI: 10.1016/j.ultsonch.2019.104912, Vol.63, pp.104912-1-8, 2020

Abstract:
We studied sonochemical reactions resulting from ultrasonic treatment of potassium hexacyanoferrate(II) in aqueous solutions using a custom-built apparatus working at 536 kHz. We concluded that primary reactions are completely dominated by oxidation of Fe(II) to Fe(III) and did not find any evidences for degradation of cyanide. At the highest concentration used in the present study (0.1 M) we detected formation of pentacyanoaquaferrate(II) complex, which is most probably formed in reactions between hexacyanoferrate(III) anions and hydrogen atoms or hydrated electrons formed in sonochemical processes. We also determined that hydroxyl radicals formation rate in our system, (8.7 ± 1.5)∙10^-8 M∙s^-1, is relatively high compared to other reported experiments. We attribute this to focusing of the ultrasonic wave in the sample vessel. Finally, we suggest that oxidation rate of hexacyanoferrate(II) anions can be a convenient benchmark of efficiency of sonochemical reactors.

Keywords:
sonochemistry, sonooxidation, sonoreactor, advanced oxidation processes, waste-water treatment

Affiliations:
Mieldzioć P. - University of Warsaw (PL)
Tymkiewicz R. - IPPT PAN
Sołek J. - University of Warsaw (PL)
Secomski W. - IPPT PAN
Litniewski J. - IPPT PAN
Fita P. - University of Warsaw (PL)

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