Rafał J. Wróbel

West Pomeranian University of Technology

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Antoni W. Morawski

West Pomeranian University of Technology

Beata Michalkiewicz

West Pomeranian University of Technology

Urszula Narkiewicz

West Pomeranian University of Technology

Joanna Sreńscek-Nazzal

West Pomeranian University of Technology

Beata Tryba

West Pomeranian University of Technology

Joanna Kapica‐Kozar

West Pomeranian University of Technology

Sylwia Mozia

West Pomeranian University of Technology

Ewelina Kusiak‐Nejman

West Pomeranian University of Technology

Piotr Miądlicki

West Pomeranian University of Technology

Michał Zgrzebnicki

West Pomeranian University of Technology

Cooperative Institutions

West Pomeranian University of Technology

130

University of Szczecin

Zachodniopomorskie Centrum Onkologii

Institute of Chemical Engineering

AGH University of Krakow

Warsaw University of Technology

Centre National de la Recherche Scientifique

Institute of Inorganic Chemistry of the Slovak Academy of Sciences

Institute of Physics

Poznań University of Technology

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Fabrication of Antibacterial Metal Surfaces Using Magnetron-Sputtering Method

Materials (2021)

Agata Markowska‐Szczupak Oliwia Paszkiewicz Beata Michalkiewicz Adrianna Kamińska Rafał J. Wróbel

One-hundred-nanometer films consisting of silver, copper, and gold nanocrystallites were prepared, and their antibacterial properties were quantitatively measured. The magnetron-sputtering method was used for the preparation of the metallic films over the glass plate. Single- and double-layer films were manufactured. The films were thoroughly characterized with the XRD, SEM, EDS, and XPS methods. The antibacterial activity of the samples was investigated. Gram-negative

Cavity magnetron

10.3390/ma14237301

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Citations (9)

One-Step Synergistic Effect to Produce Two-Dimensional N-Doped Hierarchical Porous Carbon Nanosheets for High-Performance Flexible Supercapacitors

ACS Applied Energy Materials (2020)

Xiaoguang Liu Yanliang Wen Xuecheng Chen Anna Dymerska Rafał J. Wróbel

Porous carbon-based supercapacitor has been regarded as a promising candidate for powering wearable electronics. To improve its energy density and mechanical flexibility, great efforts have been made to design ideal porous carbon. However, it is still difficult to synthesize ideal porous carbon with reasonable pore size distribution. Herein, glucose-derived two-dimensional nitrogen-doped hierarchical porous carbon nanosheets (2D-NPC) are synthesized through a one-step pyrolysis-activation process. Melamine and potassium oxalate are used to provide synergistic blowing/activation effect and tailor the physicochemical properties of 2D-NPC for energy-storage applications, including 2D morphology, high specific surface area, well-defined hierarchical pores, and rich N-content (6.1 at. %). Benefiting from these unique features, the 2D-NPC-based electrode exhibits a high specific capacitance of 523 F g–1 in 6 M KOH electrolyte in a three-electrode system. The symmetric supercapacitor exhibits a high energy density of 108 W h kg–1 at 900 W kg–1 in an organic electrolyte. The fabricated flexible supercapacitor manifests an areal energy density of 83 μW h cm–2 at an areal power density of 625 μW cm–2. Our work provides a simple method to tune the physicochemical properties of porous carbon toward high-performance flexible supercapacitors.

Power density

Carbon fibers

10.1021/acsaem.0c01183

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Citations (39)

FeCl3-Modified Carbonaceous Catalysts from Orange Peel for Solvent-Free Alpha-Pinene Oxidation

Materials (2021)

Adrianna Kamińska Piotr Miądlicki Karolina Kiełbasa Jarosław Serafin Joanna Sreńscek-Nazzal

The work presents the synthesis of FeCl3-modified carbonaceous catalysts obtained from waste orange peel and their application in the oxidation of alpha-pinene in solvent-free reaction conditions. The use of waste orange peel as presented here (not described in the literature) is an effective and cheap way of managing this valuable and renewable biomass. FeCl3-modified carbonaceous materials were obtained by a two-stage method: in the first stage, activated carbon was obtained, and in the second stage, it was modified by FeCl3 in the presence of H3PO4 (three different molar ratios of these two compounds were used in the studies). The obtained FeCl3-modified carbon materials were subjected to detailed instrumental studies using the methods FT-IR (Fourier-transform Infrared Spectroscopy), XRD (X-ray Diffraction), SEM (Scanning Electron Microscope), EDXRF (Energy Dispersive X-ray Fluorescence) and XPS (X-ray Photoelectron Spectroscopy), while the textural properties of these materials were also studied, such as the specific surface area and total pore volume. Catalytic tests with the three modified activated carbons showed that the catalyst obtained with the participation of 6 M of FeCl3 and 3 M aqueous solutions of H3PO4 was the most active in the oxidation of alpha-pinene. Further tests (influence of temperature, amount of catalyst, and reaction time) with this catalyst made it possible to determine the most favorable conditions for conducting oxidation on this type of catalyst, and allowed study of the kinetics of this process. The most favorable conditions for the process were: temperature of 100 °C, catalyst content of 0.5 wt% and reaction time 120 min (very mild process conditions). The conversion of the organic raw material obtained under these conditions was 40 mol%, and the selectivity of the transformation to alpha-pinene oxide reached the value of 35 mol%. In addition to the epoxy compound, other valuable products, such as verbenone and verbenol, were formed while carrying out the process.

10.3390/ma14247729

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Nucleation in a gas‐solid state reaction

Crystal Research and Technology (2012)

Rafał J. Wróbel W. Arabczyk Urszula Narkiewicz

Abstract A nucleation in a reaction of a gas with a solid state where one of the products is solid (GSR‐S) has been discussed. It was pointed out that the phenomenon observed for nanopowders, i.e. nucleation in sequence of the crystallites sizes, should be valid in case of defected monocrystals. However in such a case the constituents of a monocrystal, i.e. mosaic domains separated by structural defects, should undergo phase transition in sequence of size or, in other words, the time needed for the initiation of a nucleus in the case of a small domain is shorter than in the case of big one. Finally the less defected the crystal is, the bigger domains are, and thus the longer nucleation time is needed.

Sequence (biology)

Crystal (programming language)

10.1002/crat.201200176

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Citations (1)

Alkali-treated titanium dioxide as adsorbent for CO2 capture from air

Microporous and Mesoporous Materials (2014)

Joanna Kapica‐Kozar Ewelina Kusiak‐Nejman Agnieszka Wanag Łukasz Kowalczyk Rafał J. Wróbel

Titanium Dioxide

10.1016/j.micromeso.2014.10.013

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Citations (29)

Iron(II) Sulfate(VI) from Titania Production as a Raw Material for Preparation of Hydrogen Sulfide Sorbents

Chemical Engineering & Technology (2019)

Szymon Pilczuk Rafał J. Wróbel Robert Pietrzak Jacek Przepiórski

Abstract A hybrid sorbent material for removal of hydrogen sulfide from air was developed. The material is based on activated carbon and iron compounds obtained from waste iron(II) sulfate(VI) heptahydrate. The iron salt is deposited on the carbonaceous support and subjected to oxidation (Fe 2+ to Fe 3+ ) using atmospheric oxygen under alkaline conditions. An effect of H 2 O 2 addition to the process on the composition of the resultant material was also examined. X‐ray diffraction (XRD) analyses confirmed easy conversion of waste FeSO 4 ·7H 2 O to iron oxides Fe 3 O 4 and FeOOH. The activated carbon supporting iron oxides revealed a higher efficiency in H 2 S elimination from air compared to the commercial activated carbon, without any modification.

Carbon fibers

Iron sulfide

Iron sulfate

10.1002/ceat.201800452

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Citations (1)

High-quality ZrO2/Si(001) thin films by a sol-gel process: Preparation and characterization

Journal of Applied Physics (2010)

Henning Döscher G. Lilienkamp P. Iskra W. Daum Gundula Helsch

ZrO 2 films with a sub-10-nm thickness and a roughness of about 0.2 nm have been prepared on Si(001) by a sol-gel process based on zirconium-(IV)-n-propoxide. The topography of the obtained samples has been controlled by atomic force microscopy. Chemical composition and interface reactions of the deposited films have been studied by x-ray photoemission spectroscopy and Auger electron spectroscopy. The ZrO2 films are stable against heating (up to 700 °C) in a moderate oxygen atmosphere (2×10−5 mbar oxygen partial pressure). Minor changes in the surface composition occur after rapid annealing up to 1000 °C.

Auger electron spectroscopy

Electron spectroscopy

10.1063/1.3340830

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Citations (14)

Activated Carbons Obtained from Orange Peels, Coffee Grounds, and Sunflower Husks—Comparison of Physicochemical Properties and Activity in the Alpha-Pinene Isomerization Process

Materials (2021)

Adrianna Kamińska Piotr Miądlicki Karolina Kiełbasa Marcin Kujbida Joanna Sreńscek-Nazzal

This work presents studies on the preparation of porous carbon materials from waste biomass in the form of orange peels, coffee grounds, and sunflower seed husks. The preparation of activated carbons from these three waste materials involved activation with KOH followed by carbonization at 800 °C in an N2 atmosphere. This way of obtaining the activated carbons is very simple and requires the application of only two reactants. Thus, this method is cheap, and it does not generate much chemical waste. The obtained activated carbons were characterized by XRD, SEM, XPS, and XRF methods. Moreover, the textural properties, acidity, and catalytic activity of these materials were descried. During catalytic tests carried out in the alpha-pinene isomerization process (the use of the activated carbons thus obtained in the process of alpha-pinene isomerization has not been described so far), the most active were activated carbons obtained from coffee grounds and orange peels. Generally, the catalytic activity of the obtained materials depended on the pore size, and the most active activated carbons had more pores with sizes of 0.7–1.0 and 1.1–1.4 nm. Moreover, the presence of potassium and chlorine ions in the pores may also be of key importance for the alpha-pinene isomerization process. On the other hand, the acidity of the surface of the tested active carbons did not affect their catalytic activity. The most favorable conditions for carrying out the alpha-pinene isomerization process were the same for the three tested activated carbons: temperature 160 °C, amount of the catalyst 5 wt.%, and reaction time 3 h. Kinetic studies were also carried out for the three tested catalysts. These studies showed that the isomerization over activated carbons from orange peels, coffee grounds, and sunflower seed husks is a first-order reaction.

Sunflower oil

Husk

10.3390/ma14237448

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Citations (16)

Geochemistry and Mineralogy of Ferromanganese Crusts from the Western Cocos-Nazca Spreading Centre, Pacific

Minerals (2022)

Dominik Zawadzki Łukasz Maciąg Iker Blasco Javier González Benjamin Wernette

Late Pleistocene–Holocene rocks from the western part of Cocos-Nazca Spreading Centre (C-NSC) include ferromanganese crusts that elucidate the geochemistry and mineralogy of a deep-sea geological setting. Six representative Fe-Mn crust samples were studied using petrological methods, such as optical transmitted light microscopy, energy dispersive X-ray fluorescence spectrometry, inductively coupled plasma mass spectrometry, bulk X-ray diffraction, scanning electron microscopy and electron probe microanalysis. Geochemical, mineralogical and petrological signatures indicate complex formation influenced by mild hydrothermal processes. These crusts consist mostly of mixed birnessite, todorokite-buserite, and Mn-(Fe) vernadite with traces of diagenetic manganates (asbolane), Fe-oxides and oxyhydroxides or hydrothermally associated and relatively pure Mn-oxyhydroxides (manganite). The average Mn/Fe ratio is 2.7, which suggests predominant mixed hydrogenous-early diagenetic crusts with hydrothermal influences. The mean concentrations of three prospective metals (Ni, Cu and Co) are low: 0.17, 0.08 and 0.025 wt %, respectively. The total content of ΣREY is also low, and ranges from 81 to 741 mg/kg (mean 339 mg/kg). We interpret the complex geochemical and mineralogical data to reflect mixed origin of the crusts, initially related with formation of hydrothermal plume over the region. This process occurred during further interactions with seawater from which additional diagenetic and hydrogenetic elemental signatures were acquired.

Ferromanganese

Birnessite

10.3390/min12050538

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Citations (9)

Photocatalytic degradation of acetic acid in the presence of visible light-active TiO 2 -reduced graphene oxide photocatalysts

Catalysis Today (2016)

Antoni W. Morawski Ewelina Kusiak‐Nejman Agnieszka Wanag Joanna Kapica‐Kozar Rafał J. Wróbel

Photodegradation

Titanium Dioxide

Titanium oxide

Visible spectrum

10.1016/j.cattod.2016.05.055

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Citations (47)