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Number of found documents:
6847
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Removal of PFASs from sewage sludge by pyrolysis
Hušek, Matěj
2022 - English
Our work aimed to describe PFASs behaviour at different pyrolysis temperatures (200 to 700 °C). We analysed 37 PFAS in sewage sludge samples and pyrolysis products. The temperature at which PFASs were removed from the sewage sludge at more than 99.0% was 400 °C, and at 600 °C, removal was more than 99.9%. As a result, it is recommended for commercial sludge pyrolysis units (larger volume, lower material homogeneity) that the process temperature be not lower than 600 °C. This recommendation is supported and demonstrated by the analyses of samples from the Bohuslavice Trutnov WWTP (CZE), where the sludge pyrolysis unit is in operation.\n
Keywords:
sewage sludge samples; pyrolysis; temperature
Available in a digital repository NRGL
Removal of PFASs from sewage sludge by pyrolysis
Our work aimed to describe PFASs behaviour at different pyrolysis temperatures (200 to 700 °C). We analysed 37 PFAS in sewage sludge samples and pyrolysis products. The temperature at which PFASs were ...
Application of hydrodynamic cavitation in brewing
Štěrba, Jiří
2022 - English
The aim of this work is to apply these advantages in the brewery industry. In the field of beer brewing, we would like to investigate several phenomena, such as the isomerization of bitter hop acids, the reduction of gluten concentration or the cell-walls breakdown.\n
Keywords:
hydrodynamic cavitation; brewery industry; Venturi jet system
Available in a digital repository NRGL
Application of hydrodynamic cavitation in brewing
The aim of this work is to apply these advantages in the brewery industry. In the field of beer brewing, we would like to investigate several phenomena, such as the isomerization of bitter hop acids, ...
Vertical distribution of black carbon (BC)
Julaha, Kajal
2022 - English
Black Carbon (BC) is one of the leading contributors affecting our climate system. Absorbing at all visible wavelengths results in a warmer environment and thus has been considered the second most important contributor to global warming after carbon dioxide. The primary sources of BC aerosol are the incomplete combustion of fossil fuels and biomass burning. However, the composition of atmospheric aerosols varies with the height above the Earth’s surface. Recent studies have shown significant uncertainties (about 25%) in model simulations of the vertical BC distribution, both on the regional and global levels. BC’s vertical transport is suggested to be one area where the models still differ significantly,4,5 highlighting further investigation.
Keywords:
black carbon; fossil fuels and biomass; atmospheric aerosol
Available in a digital repository NRGL
Vertical distribution of black carbon (BC)
Black Carbon (BC) is one of the leading contributors affecting our climate system. Absorbing at all visible wavelengths results in a warmer environment and thus has been considered the second most ...
Continuous electrocoagulation of Chlorella vulgaris in a novel channel-flow reactor
Lucáková, Simona
2022 - English
In our laboratory, we employed an electrocoagulation process with iron sacrificial anode leading to the separation of Chlorella vulgaris cells with high efficiency and at the same time acceptable low contamination of separated biomass by iron. Comparing to only centrifugation, the total energy costs of harvesting using electrocoagulation as a pre-concentration step prior to centrifugation were reduced by more than 80%. After extensive study of the influence of relevant process parameters.
Keywords:
chlorella vulgaris; electrocoagulation; biomass; iron
Available in a digital repository NRGL
Continuous electrocoagulation of Chlorella vulgaris in a novel channel-flow reactor
In our laboratory, we employed an electrocoagulation process with iron sacrificial anode leading to the separation of Chlorella vulgaris cells with high efficiency and at the same time acceptable low ...
Tetracycline degradation using catalysts of platinum coated over CeO2 and CeO2ZrO2
Bourassi, Mahdi
2022 - English
These works showed that, by adding well defined nanoparticles into ionic liquids, it is possible to tune or/and enhance their thermophysical properties and make them more suitable for electrical and thermal energy storage, and heat transfer applications.
Keywords:
catalytic experiments; tetracycline; water depollution
Available in a digital repository NRGL
Tetracycline degradation using catalysts of platinum coated over CeO2 and CeO2ZrO2
These works showed that, by adding well defined nanoparticles into ionic liquids, it is possible to tune or/and enhance their thermophysical properties and make them more suitable for electrical and ...
Ambient organic aerosol origin at rural background site in the Czech Republic
Lhotka, Radek
2022 - English
Source apportionment of organic aerosols (OA) at background sites is one of the important tasks of the current air quality protection. OA are emitted directly from primary sources or formed in the atmosphere via the oxidation of gas-phase precursors with subsequent partitioning resulting in low-volatility products into the particle phase.
Keywords:
organic aerosol; air quality protection; ural background site
Available in a digital repository NRGL
Ambient organic aerosol origin at rural background site in the Czech Republic
Source apportionment of organic aerosols (OA) at background sites is one of the important tasks of the current air quality protection. OA are emitted directly from primary sources or formed in the ...
Physicochemical Properties and Origin of PM1 Measured at a Rural Background Site
Pokorná, Petra; Zíková, Naděžda; Vodička, Petr; Lhotka, Radek; Mbengue, Saliou; Holubová Šmejkalová, A.; Riffault, V.; Ondráček, Jakub; Schwarz, Jaroslav; Ždímal, Vladimír
2022 - English
This study assesses the variability of organic aerosol (OA) sources monitored at the rural background site Frýdlant. Non-refractory PM1 was evaluated in two seasons of\n2021. The positive matrix factorization with the multi-linear engine was used to determine the sources of OA at Frýdlant site, with four factors resolved both in winter and\nsummer.
Keywords:
organic aerosols; positive matrix factorization with multi-linear engine; non-refractive aerosol
Available in a digital repository NRGL
Physicochemical Properties and Origin of PM1 Measured at a Rural Background Site
This study assesses the variability of organic aerosol (OA) sources monitored at the rural background site Frýdlant. Non-refractory PM1 was evaluated in two seasons of\n2021. The positive matrix ...
An Improved Method for Calculation of the Wet Particle Diameter and tha Kappa Parameters from the CCN Data
Wagner, Zdeněk; Mishra, Gaurav; Moravec, Pavel; Zíková, Naděžda
2022 - English
The study of particle size distribution and hygroscopic growth is important for several reasons. Particle diameter is available experimentally, but the relationship of \nhygroscopic growth to cloud condensation nuclei (CCN) and AMS data can be modeled mathematically. In this paper, we present an improved algorithm for calculating the wet \nparticle diameter and the κ parameter that is faster, more accurate, and more reliable than the algorithm used by other authors.\n
Keywords:
critical diameter; wet particle diameter; CCN
Available in a digital repository NRGL
An Improved Method for Calculation of the Wet Particle Diameter and tha Kappa Parameters from the CCN Data
The study of particle size distribution and hygroscopic growth is important for several reasons. Particle diameter is available experimentally, but the relationship of \nhygroscopic growth to cloud ...
Electrochemical Characterization of Self-Assembled Monolayers Containing Redox Switching Element
Nováková Lachmanová, Štěpánka; Kocábová, Jana; Vavrek, František; Sebechlebská, Táňa; Šebera, Jakub; Kolivoška, Viliam; Lukášek, J.; Balzer, N.; Valášek, M.; Hromadová, Magdaléna
2022 - English
Adsorption properties of molecules containing [Ru(terpy)2]2+ and [Os(terpy)2]2+ redox switching element connected to the electrode surface by tripodal thiolate anchoring groups have been studied together with their charge transfer properties in the adsorbed form. STM-based current-voltage measurements confirmed that the conductance of self-assembled monolayer containing [Os(terpy)2]2+ redox switching element is lower than that containing [Ru(terpy)2]2+ element. This observation agrees with previously observed differences in the electron transfer rate constants of these molecules in their adsorbed state.
Keywords:
[Ru(terpy)2]2+; [Os(terpy)2]2+; Tripodal Anchor; Self-Assembled Monolayer; Electrochemical Impedance Spectroscopy
Available on request at various institutes of the ASCR
Electrochemical Characterization of Self-Assembled Monolayers Containing Redox Switching Element
Adsorption properties of molecules containing [Ru(terpy)2]2+ and [Os(terpy)2]2+ redox switching element connected to the electrode surface by tripodal thiolate anchoring groups have been studied ...
Redoxní vlastnosti konjugovaných derivátů fosfolů – elektrochemická studie
Koláčná, Lucie; Polák, P.; Tobrman, T.; Ludvík, Jiří
2022 - Czech
Fosfoly a jejich deriváty jsou často využívány jako stavební kameny v π-konjugovaných systémech. Nacházejí uplatnění v katalýze, bio-anoganické i materiálové chemii, např. jako OLED (Organic light-emitting diode – světlo vyzařující organické diody), OPV (Organic Photovoltaics – organické fotovoltaické články), OFET (Organic field-effect transistor – organické tranzistory řízené elektrickým polem), NLO (nelineární optické přístroje), luminiscenční materiály, polovodiče, tekuté krystaly i molekulární stroje. \nRedoxní vlastnosti studovaných molekul byly sledovány v nevodném prostředí acetonitrilu (AN) na různých elektrodách pomocí oxidace a redukce. Vyhodnocení oxidačních a redukčních potenciálů a jejich interpretace, jejich posunů a rozdílů umožnilo určení tzv. ´´elektrochemického´´ HOMO-LUMO gap, studium podílu substituentů na celkových redoxních vlastnostech studovaných látek i ovlivnění planarity molekuly a míry delokalizace elektronů. The study describes pentasubstituted phospholes with a π-conjugated arms in positions 2 and 5 of the phosphole ring. According to the expectations, substituents with electron-donating groups led to lower oxidation potentials, the presence of electron-withdrawing groups shifts the reduction potential to less negative values. Because all studied phospholes have multiple substituents of both types, their resulting potentials represent the sum of their influences. Moreover, since many of the studied compounds have two redox centers (phosphole moiety itself and the pi-conjugated arm), their locations were determined and intramolecular interactions were followed, because substituents which can be conjugated with the π-system of phosphole are able to extend the delocalized π-system resulting in stabilization of primary redox intermediates. Chemical modification of phospholes using various combinations of substituents can set the desired electrochemical properties of studied molecules.
Keywords:
phosphole; conjugation; electrochemical rteduction and oxidation; polarography
Available on request at various institutes of the ASCR
Redoxní vlastnosti konjugovaných derivátů fosfolů – elektrochemická studie
Fosfoly a jejich deriváty jsou často využívány jako stavební kameny v π-konjugovaných systémech. Nacházejí uplatnění v katalýze, bio-anoganické i materiálové chemii, např. jako OLED (Organic ...
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