Anna PajdakPolish Academy of Sciences | PAN · Strata Mechanics Research Institute
Anna Pajdak
PhD Engineer
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51
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297
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Citations since 2017
Introduction
Skills and Expertise
Additional affiliations
October 2014 - present
Polish Academy of Sciences, Cracow, Poland
Position
- PhD
October 2010 - October 2014
Publications
Publications (51)
Production wastewater has evolved with dye and printing technology to become one of the major sources of soil and water contamination. The majority of dyes are carcinogenic, teratogenic, and mutagenic compounds. As a result, dealing with the dye in the wastewater is a critical issue. Insoluble polymers of β-cyclodextrin (β-CD), an inexpensive, sust...
This paper presents a study of the application of the properties of water vapor as a gas with high potential energy, strongly dependent on temperature and pressure. Analyses of water vapor sorption on two types of silica gels (SG) (90 wt.%) enriched with carbon nanotubes (CNTs) (10 wt.%), in the context of their application in the design of adsorpt...
Increasing energy efficiency, reducing energy demand and greenhouse gas emissions, and the use of waste and renewable and recycled heat from low-temperature sources are significant goals today that are captured in the concept of the 4th Generation District
Heating (4GDH). On the other hand, around 1 billion people around the world are currently suf...
The effective sorption of methane with mesoporous adsorbents is one of the most sought-after methods of energy storage. The constant development of organometallic networks and the synthesis of new materials increases the efficiency of methane sorption, reaching new record amounts of gas adsorbed per gram of adsorbent. In this study, we present the...
The removal of uremic toxins from patients with acute kidney injury is a key issue in improving the quality of life for people requiring peritoneal dialysis. The currently utilized method for the removal of uremic toxins from the human organism is hemodialysis, performed on semipermeable membranes where the uremic toxins, along with small molecules...
The authors derived the analytical solution to diffusion equations. The solution requires linearization of diffusion equations, as well as developing the obtained expression into a series. In particular, the result of the first procedure is highly deviated from the exact solution. The authors conducted a sorption experiment and then, in relation to...
In this study, we present a modulated synthesis nanocrystalline defective UiO-66 metal–organic framework as a potential chloroquine diphosphate (CQ) delivery system. Increasing the concentration of hydrochloric acid during the modulated synthesis resulted in a considerable increase of pore volume, which enhanced the CQ loading in CQ@UiO-66 composit...
In the conducted research, the effect of moisture on CO2 sorption and transport processes and changes occurring in the coal pore structure were investigated in detail. The measurements were carried out under isothermal (313 K) and isobaric conditions (0.1−0.8 MPa) on the original device - a manometric sorptomat. Coal sorption capacities, Langmuir s...
In recent years, the interest in the sorption properties of coal in conditions corresponding to in situ has increased due to the continuous development of research on CO2-ECBM (Enhanced Coal Bed Methane recovery) technology. In order to gain a better insight into a number of phenomena related to filtration, sorption and CO2/CH4 exchange sorption oc...
The aim of the study was to analyse the effect of temperature on the sorption and diffusion of CO2 and CH4 on hard coal. Four coal samples, characterized by various degrees of coalification, were used in the research. The sorption measurements were carried out in three temperature values: 278 K, 313 K and 353 K and for the consecutive pressure valu...
This article presents a study of the effect of metal particle and carbon nanotube additives on the thermal diffusivity of a silica-gel-based adsorption bed of an adsorption chiller. The structural properties of silica gel and carbon nanotubes were investigated using the volumetric method of low-pressure nitrogen adsorption. Thermal characteristic t...
The article presents comparative characteristics of the pore structure and sorption properties of raw halloysite (R-HAL) and after calcination (C-HAL) at the temperature of 873 K. Structural parameters were determined by optical scanning and transmission electron microscopy methods as well as by mercury porosimetry (MIP, Hg) and low-pressure nitrog...
The paper presents the results of studies on sorption and CO2 desorptions from coals from two Polish mines that differed in petrographic and structural properties. The tests were carried out on spherical and plane sheet samples. On the basis of the sorption tests, the effective diffusion coefficient was calculated on the plane sheet samples based o...
The aim of this research was to compare the structure, sorption properties and the kinetics of sorption to CO2 and CH4 in nanomaterials with a very orderly structure and in structurally heterogeneous coal. The authors tested synthetic materials such as multiwall carbon nanotubes (MWCNT) and reduced graphene oxide (rGO) as well as natural materials...
The goal of this paper is to analyze the phenomenon of gas emission during a methane and coal outburst based on the unipore Crank diffusion model for spherical grains and plane sheets. Two occurrences in the Upper Silesian Coal Basin were analyzed: an outburst in a Zofiówka coal mine in 2005 and an outburst in a Budryk coal mine in 2012. Those two...
The goal of this paper is to analyze the phenomenon of gas emission during a methane and coal outburst based on the unipore Crank diffusion model for spherical grains and plane sheets. Two occurrences in the Upper Silesian Coal Basin were analyzed: an outburst in a Zofiówka coal mine in 2005 and an outburst in a Budryk coal mine in 2012. Those two...
Two types of coal with different degrees of coalification were used to study the effect of their chem. compn. on sorption properties. Contents of volatile parts and elemental C in the coals were 29.2% and 86.4% and 40.9% and 79.6%, resp. Both coal types were used sep. to measure MeH sorption at 298 and 308 K and variable pressure conditions under 0...
The article discusses the validation process of a certain method of balancing gas contained in the pore space of rocks. The validation was based upon juxtaposition of the examination of rocks' porosity and the effects of comminution in terms of assessing the possibility of opening the pore space. Th e tests were carried out for six dolomite samples...
Adsorption of CO2 and N2 onto coal is used to describe its porous structure. It is mainly CO2 that allows for the analysis of the adsorption on coal, whose porous structure is dominated by micropores. Depending on the specificity of the transition process of CO2 molecules from the free state to the adsorbed state, the thermal characteristics of the...
H2 was sorbed in LaNi5 alloy and on multiwalled C nanotubes (MWCNT) at 313 K and 0–2 MPa to study the kinetics of sorption. The surface area of MWCNT was about 110 m²/g and the surface area of the alloy LaNi5 approached zero. The H2 sorption capacity of LaNi5 was 2 orders higher than those of MWCNT. The time necessary for the sorption balance and t...
![Fig. 1. Schematic sketch of the considered flow [1]](profile/Adam-Gnatowski/publication/326673764/figure/fig1/AS:653823836184577@1532895158405/Schematic-sketch-of-the-considered-flow-1_Q320.jpg)
![Fig. 3. Temperature profile in thermal boundary layer [26]](profile/Adam-Gnatowski/publication/326673764/figure/fig3/AS:653823836188673@1532895158473/Temperature-profile-in-thermal-boundary-layer-26_Q320.jpg)
The paper presents a simple method for determining the phenomenon of unsteady thermal effects in cooling of circular cylinder. The research has been undertaken in order to explain the thermoaerodynamic processes, which are characterized by the turbulent structure of the flow around a stationary rigid heated cylinder cooled by the oscillating flow....
The article discusses the validation process of a certain method of balancing gas contained in the pore space of rocks. The validation was based upon juxtaposition of the examination of rocks' porosity and the effects of comminution in terms of assessing the possibility of opening the pore space. The tests were carried out for six dolomite samples...
The article presents the effects of mechanical and thermal modification on the surface area of sodium bicarbonate and its ability to remove SO2 and HCl from exhaust fumes.
The mechanical modification consisted of grinding in an impact mill. The thermal modification consisted of heating in the temperature range from 373 K to 673 K. The applied modi...
The article presents research into the reactivity and SO2 sorption abilities of calcareous sorbents, which vary in quality. Two sorbents were used: limestone and travertine, with grain sizes between 0.125 and 0.250 mm. The sorbent reactivity tests were performed on a laboratory test stand. The reactivity index and the conversion degree were also de...
Basic knowledge of the characteristics of cop-per-bearing rock such as dolomite is essential to locate those areas of the deposit which have different structural and textural properties. Those regions can be important in terms of the assessment of the possibilities of gas accumulating in them as well as in terms of gasogeodynamic hazard. To better...
The aim of this paper was to investigate the repeatability of sorption processes occurring in the coal-methane system during multiple measurement series. For research purposes, three granular samples of coal sorbent were used. The samples were subjected to a series of three measurements, each time performed under the same conditions. During each se...
W ramach prac przeprowadzono badania konkurencyjnej sorpcji na węglu kamiennym z wykorzystaniem mieszanin CH4 i CO2 o różnym udziale procentowym składników. Do badań użyto próbki rozdrobnionego do ziaren węgla kamiennego pochodzącego z partii K pokładu 510 KWK „Wujek”, Ruch Śląsk. Eksperymenty sorpcji konkurencyjnej wykonano przy zastosowaniu autor...
W artykule zaprezentowano przegląd rozwiązań konstrukcyjnych silników Stirlinga w typach układów α, β, γ. Przedstawiono możliwości zastosowania tych silników w różnych układach z odnawialnymi źródłami energii w szczególności z wykorzystaniem energii słonecznej i biomasy. Opisano autorską konstrukcję silnika Stirlinga w układzie V, która została zap...
The characteristics of copper-bearing rocks that include the structural and textural parameters are an important factor determining a possible gas accumulation in those rocks. In September 2009, in the Rudna copper mine in Poland, an outburst of gases and dolomite occurred. The analysis of the outburst mass showed that one of the main causes of the...
This article presents the results of research into calcareous waste from the production process of oxide propylene. The obtained results show a considerable chemical diversity of calcareous waste with a predominant percentage share of Ca, C and Cl, which are the products of the process. It was shown that the share of calcium bonded in CaCO3 was ove...
Korelacja parametrów przyczyn i skutków tąpnięć zaistniałych w kopalniach węgla kamiennego w GZW streszczenie: Zjawisko tąpnięcia występujące w kopalniach węgla kamiennego wynika z wielu czynników naturalnych cechujących skały oraz czynników technicznych związanych z technologią i intensywnością eksploatacji. W ar-tykule przeprowadzono analizę stat...
W artykule przedstawiono charakterystykę odpadowych popiołów lotnych uzyskanych w procesie spalania węgla kamiennego w instalacji z kotłem fluidalnym. Jako sorbent do usuwania poprocesowych zanieczyszczeń gazowych wykorzystano wodorowęglan sodu w postaci sody oczyszczonej i bikarbonatu surowego wysuszonego. Uzyskane popioły lotne poddano analizie s...
W artykule przedstawiono zestawienie analiz porozymetrycznych dolomitu w aspekcie ich charakterystyki. Badania wykonano dla sześciu próbek pobranych z kopalń rud miedzi O/ZG „Polkowice-Sieroszowice” oraz O/ZG „Rudna”, które określono metodami niskotemperaturowej adsorpcji azotu oraz porozymetrii rtęciowej.
Analizy adsorpcji gazowej (N2) materiału...
Com. and activated Ca(OH)2 were ground and studied for grain size distribution, d., sorption vol. and capacity as well as textural parameters after storage for 6 and 12 months. The modified Ca(OH)2 produced by slaking CaO in aq. EtOH showed the best textural parameters but was unstable during storage.
Przedstawiono wyniki badań laboratoryjnych wpły...
This article presents the effects of the use of a modified sodium compound in the form of sodium bicarbonate in the simultaneous purification of the exhaust fumes from sulphur dioxide (SO2) and chloride (HCl) in power plants and CHP plants fuelled by coal. The initial stage included the examination of the effect of mechanical and thermal modificati...
This article presents effects of low-pressure gas adsorption analysis of coal coming from 13 coal mines on the territory of Poland and The Czech Republic. The measurements consisted in specifying the sorption capacity against carbon dioxide (CO2) in the temperature of 258K (-15oC) and in the absolute pressure range from 0 bar to 1 bar, which became...
Corn. NaHCO3 was activated by milling at 300 degrees C (speed 2000-5000 rpm) for 30 min to increase its sp. surface from 0.1 m(2)/g up to 4.2 m(2)/g. The activated NaHCO3 was used for sorption of SO2 from a model gas mixt. (SO2, CO2 and O-2 contents 2200 ppm, 16% and 6%, resp.). The activated NaHCO3 showed the SO2 removal efficiency 85-96% at conve...
W artykule przedstawiono wyniki badań porozymetrycznych węgla kamiennego wyznaczonych metodą niskociśnieniowej adsorpcji gazowej. Pomiary przeprowadzono w kilku temperaturach, z zastosowaniem azotu (N2) w temperaturze 77 K oraz ditlenku węgla (CO2) w temperaturach 258 K, 273 K, 278 K i 288 K. Przy wykorzystaniu azotu jako adsorbatu określono objęto...
This paper presents the results of study on structural parameters (particle size, surface area, pore volume) and the sorption ability of mechanically and thermally activated sodium bicarbonate. The sorption ability of the modified sorbent was evaluated by: partial and overall SO2 removal efficiency, conversion rate, normalized stoichiometric ratio...
W artykule przedstawiono wyniki pomiarów strukturalnych oraz badań zdolności usuwania NOx wodorowęglanu sodu w postaci sody oczyszczonej oraz bikarbonatu surowego bez oraz po modyfikacji mechanicznej. Parametry strukturalne które wyznaczano to: uziarnienie i powierzchnia właściwa. Badania sorpcji prowadzono w temperaturach: 300 oC i 850 oC. Zdolnoś...
This paper presents the results of study on structural measurements and ability to remove nitrogen oxides of sodium bicarbonate in the form of baking soda and raw bicarbonate, without and after mechanical activation. Structural parameters was evaluated by: particle size and surface area. The studies of NOx sorption were carried out at temperatures...
The results of laboratory tests to determine the effect of mechanical and thermal activation on the sorption properties of sodium bicarbonate are reported. The best sorption properties were found in ground sorbent after activation at 250C. The examination of the specific surface confirmed the microporous character of the modified sodium bicarbonat...
Przedstawiono wyniki badań laboratoryjnych określających wpływ aktywacji mechanicznej i termicznej na właściwości sorpcyjne wodorowęglanu sodu. Stwierdzono, że najlepsze właściwości sorpcyjne, uzyskano w sorbencie mielonym po aktywacji w 250 ºC. Badania powierzchni właściwej potwierdziły makroporowaty charakter modyfikowanego wodorowęglanu sodu. Te...
W artykule przedstawiono wyniki badań laboratoryjnych, określających proces rozkładu wodorowęglanu sodu oraz wpływ aktywacji termicznej na rozwinięcie jego powierzchni właściwej i porowatości. Stwierdzono, że maksymalne rozwinięcie powierzchni właściwej i porowatości ma miejsce w temperaturze 700ºC (przy czasie aktywacji 1 min). Na podstawie wynikó...
NaHC03 was heated at 25-900°C for 60 s to follow its mass loss, content of Na2CO3 pore vol., porosity and sp. surface. At the optimum temp. 700°C, max. porosity (69%,) and sp. surface 5,26 m2/g were achieved.
Projects
Projects (5)
Over the years, we have seen the rapid development of simulation tools, sophisticated measurement devices, and techniques applied to ventilation system analysis. These are used in the ventilation and air conditioning of various facilities, ranging from cars, houses, and industrial facilities to underground building structures such as tunnels or mines. In many cases, this task is made difficult by the conditions created by the ventilated object itself, such as the object’s complexity, gas, fire or explosion hazards, and work of people and machines. Such tasks require comprehensive activities from researchers, starting from a theoretical analysis of phenomena in ventilation networks, through their modeling and experimental verification with the use of precise measurement systems. The Special Issue focuses on a new approach to modeling and measurement system applications related to in-depth analysis of HVAC systems.
