Browsing by Author "Stando, Grzegorz"
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- Copper recovery from industrial wastewater - Synergistic electrodeposition onto nanocarbon materials
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä(2021-12) Stando, Grzegorz; Hannula, Pyry-Mikko; Kumanek, Bogumiła; Lundström, Mari; Janas, DawidIn this study, copper present in industrial waste water with a variety of other impurities (Fe, Mg, Al, Zn, As) was subjected for selective electrochemical recovery. The recovery was conducted directly on carbon nanostructures in order to create added-value products synergistically. In-depth electrochemical and structural analysis showed that single/multi-walled carbon nanotubes (CNTs) and graphene composites could provide an excellent substrate for Cu's electrochemical recovery. Furthermore, formulations based on them also enabled the formation of even Cu deposits on the surface directly from wastewater solutions without further bath condition adjustments. After just 1-h electrodeposition at −0.1V vs. SCE, a nanocomposite based on CNTs was obtained. Cu was recovered exclusively and accounted for 45% of the total weight of the composite. - Doping of carbon nanotubes by halogenated solvents
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä(2022-04-29) Taborowska, Patrycja; Stando, Grzegorz; Sahlman, Mika; Krzywiecki, Maciej; Lundström, Mari; Janas, DawidCarbon nanotubes (CNTs) play a unique role in the area of flexible conductors as they have remarkably high electrical conductivity and bend easily without deformation. Consequently, CNTs are commonly deposited on substrates as conductive tracks/coatings. Halogenated solvents are often employed to facilitate the deposition process because they dry rapidly due to their high volatility. In this work, we report that halogenated solvents can dope CNTs considerably. The study showed that the use of dichloromethane, chloroform, or bromoform for the CNT deposition significantly impacts the chemical potential of the material, thereby modifying its charge transport characteristics. As a consequence, up to four-fold improvement in electrical conductivity is noted due to doping.