Repozytorium publikacji - Politechnika Gdańska

Ustawienia strony

english
Repozytorium publikacji
Politechniki Gdańskiej

Pokaż publikacje z roku

Publikacje z roku 2023

Pokaż wszystkie
  • The Effect of Titanium Oxyfluoride Morphology on Photocatalytic Activity of Fluorine-Doped Titanium(IV) Oxide
    • Marta Kowalkińska
    • Jakub Karczewski
    • Anna Zielińska-Jurek
    2023 Pełny tekst Crystals

    Titanium oxyfluoride (TiOF2) is a metastable product that can be obtained in a fluorine-rich environment. This material can also be a valuable precursor in the synthesis of titanium(IV) oxide (TiO2). However, the effect of TiOF2 morphology on the physicochemical properties of TiO2 has not been studied so far. In this work, single-phase TiOF2 was prepared by a solvothermal method. The as-synthesized samples exhibited a variety of morphologies, including different shapes and crystallite sizes. These materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) combined with energy-dispersive X-ray spectroscopy (EDS), surface area measurements, thermal gravimetric analysis (TGA) and UV–vis diffuse reflectance spectroscopy (DR/UV–vis). Furthermore, TiOF2 samples were used as precursors in the synthesis of fluorine-doped titanium(IV) oxide and applied in photocatalytic phenol degradation under UV-vis light. The experiments showed that the crystallite size of the precursor, as well as the number of fluoride ions used in the synthesis, were the predominant factors that affected the photocatalytic activity of the final photocatalyst.

  • The effects of gas exposure on the graphene/AlGaN/GaN heterostructure under UV irradiation
    • Katarzyna Drozdowska
    • Sergey Rumyantsev
    • Janusz Smulko
    • Andrzej Kwiatkowski
    • Pavlo Sai
    • Paweł Prystawko
    • Aleksandra Krajewska
    • Grzegorz Cywiński
    2023 Pełny tekst SENSORS AND ACTUATORS B-CHEMICAL

    This work demonstrates a graphene/AlGaN/GaN sensing device with two-dimensional electron gas (2DEG) toward nitrogen dioxide (NO2), tetrahydrofuran, and acetone detection under UV light irradiation. We propose combining measurements of the DC characteristics with a fluctuation-enhanced sensing method to provide insight into the gas detection mechanisms in the synergistic structure of highly stable GaN and gas-sensitive graphene. Both DC and low-frequency noise studies reveal the impact of UV irradiation (275 nm) on the GaN-based field-effect transistor (FET). Gas detection improves under UV light with higher differentiability between selected concentrations of inorganic (NO2) gas and the possibility of discrimination between weakly adsorbing organic species (tetrahydrofuran and acetone). Time-domain experiments confirm the stability and reversibility of sensor (short-time and long-time) responses and reduced time drift after employing UV light. Features observed in the 1/f noise spectra may indicate the high impact of the irradiation on the trapping states in the GaN-based heterostructure, which further modulates the fluctuations of the channel carriers in our device. Our findings broaden the view on AlGaN/GaN heterostructures modulated with a graphene gate for gas sensing purposes, including strongly binding inorganic gas and weakly adsorbing organic species.

  • The effects of the IM1-12Br ionic liquid and the oxytetracycline mixture on selected marine and brackish microorganisms
    • Lilianna Sharma
    • Błażej Kudłak
    • Grzegorz Siedlewicz
    • Ksenia Pazdro
    2023 SCIENCE OF THE TOTAL ENVIRONMENT

    The number of applications and commercialized processes utilizing ionic liquids has been increasing, and it is anticipated that this trend will persist and even intensify in the future. Ionic liquids possess desirable characteristics, such as low vapor pressure, good water solubility, amphiphilicity, and stability. Nevertheless, these properties can influence their environmental behavior, resulting in resistance to biotic and abiotic degradation and subsequent water contamination with more harmful derivatives. However, there is a notable scarcity of data regarding the impact of mixtures comprising ionic liquids and other micropollutants. Identifying potential potentiation of ionic liquids (Ils) toxicity in the presence of other xenobiotics is a proactive risk assessment measure. Therefore, the study aims to fill an important knowledge gap and identify possible interactions between imidazolium-based ionic liquid (IM1–12Br) and the common antibiotic oxytetracycline (OXTC). During 11-day experiments, selected marine, brackish and freshwater microorganisms (diatom Phaeodactylum tricornutum, cyanobacterium Microcystis aeruginosa and green algae Chlorella vulgaris) were exposed to binary mixtures of target substances. The assessed responses encompassed chlorophyll a kinetic parameters related to photosynthesis efficiency, as well as pigment concentrations, specifically phycobilin content. Additionally, the impact on the luminescent marine bacterium Aliivibrio fischeri has been evaluated. Significant effects on the growth, photosynthetic processes, and pigment content were observed in all the targeted microorganisms. The concentration addition (CA) and independent action (IA) mathematical models followed by the Model Deviation Ratio (MDR) evaluation enabled the identification of mainly synergistic interactions in the studied mixtures.

  • The elasto-plastic numerical study of crack initiation in notched PMMA specimens under uniaxial loading conditions – Tension and torsion
    • Elżbieta Bura
    • Andrzej Seweryn
    2023 Pełny tekst THEORETICAL AND APPLIED FRACTURE MECHANICS

    This paper presents the results of FEM numerical calculations aimed at describing the plastic strain and stress fields under critical loading conditions: tensile force or torsional moment. The calculations were carried out with reference to the results of experimental tensile and torsional tests of flat PMMA specimens weakened with V-notches of different root radii: 0.5, 2 and 10 mm. The procedure for conducting nonlinear numerical analyses is described, including the determination of the actual hardening curve by the hybrid method. A high level of consistency between the results of the experimental and numerical calculations was obtained through description of PMMA with the elastic-plastic material model. The points of occurrence of stress maxima and plastic strain were indicated, which were taken as potential crack initiation sites. On the basis of the stress and plastic strain values measured at the critical points, a stress-strain fracture criterion was formulated, which was then positively verified.

  • The Employment of Ukrainians as an Opportunity to Fill the Labour Market in Poland – Selected Issues
    • Krystyna Gomółka
    • Małgorzata Gawrycka
    • Marta Kuc-Czarnecka
    2023 Pełny tekst STUDIA EUROPEJSKIE

    The labour market in Poland has undergone signifi cant transformations over the past two decades. The observed changes have been infl uenced by various factors related to, among other things, the possibility of free movement of the population resulting from membership of EU structures, demographic changes, technological changes, and the automation and robotisation of production processes. Demographic change is becoming a signifi cant challenge, highlighting the shortage of workers with different qualifi cations and competencies in the labour market in various sectors of the national economy. This paper aims to indicate to what extent Ukrainian citizens can fi ll the gaps in Poland’s emerging labour market. To that end, a survey was conducted in the Qualtrics programme in MayJune 2022 among Ukrainian citizens who arrived in Poland before 24th February 2022, i.e., before the outbreak of the war and who were registered in the Gremi Personal database. This particular company provides support connected to employment for Ukrainians. Due to the non-probabilistic sampling technique, the results cannot be generalised with regard to the entire population. To analyse the results, descriptive statistics were used to examine the population structure and determine the signifi cance of the characteristics studied and the correlation between them. The research shows that labour shortages in Poland’s labour market can be compensated to some extent by employing migrants from, for example, Ukraine. The commencement of the proper research was preceded by the preparation of a pilot study and the collection and analysis of statistical data related to the situation on the Polish labour market, taking into account the level and structure of employment and an indication of shortages in the labour market when the research was prepared, and the fact that complete statistical data ended in 2020, hence the decision to include this research period in the analyses.

  • The energy concept of money
    • Oleksandr Melnychenko
    2023 Pełny tekst Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

    Purpose: This paper aims to provide the literature review seeking an answer whether energy can be used as a universal equivalent instead of money. Methodology: The author conducted a review of available literature and data sources related to the money theory and energy concept of money. Findings: It was found that the definition of energy as a general equivalent has a contextual and dynamic nature, and this field’s consolidation and logical expansion require a conceptual review. In this study, we talk about the basic principles of the energy concept of money: origin, recognition, and circulation. Throughout this paper, we explore key aspects of this new agenda, demonstrating that energy is at the heart of money circulation. Research limitations: It is suggested three areas for future research: quantifying the stability of energy price in the context of fiat money in dynamics, technological implementation of transactions, and the development of accounting technologies. Practical implications: Consolidating the available literature and providing suggestions on how money theory can be developed in light of the current energy challenges. The author’s approach the energy concept of money from an interdisciplinary perspective, including knowledge of economics, business, accounting, payment systems, law, and philosophy, to reflect on their own experiences. The energy concept of money in this study refers to the use of energy in a broad sense as a universal equivalent, the role of which is played today by money. Originality: In this paper, the author seeks to contribute to a deeper understanding of the energy basis of money by exploring the conceptual and empirical relationship between money, trust, and energy.

  • The environmental dimension of city dwellers’ quality of life and the city’s social and spatial variability
    • Maciej Brosz
    • Małgorzata Dymnicka
    • Iwona Sagan
    • Jarosław Załęcki
    2023 Pełny tekst Miscellanea Geographica

    The purpose of this paper is to attempt an analysis of the environmental dimension of the quality of life using quantitative surveys conducted among residents of Gdańsk. In the paper, we make reference to the theoretical assumptions ensuing from the concept of a comprehensive and integrated approach to the development of the urban environment, whilst noting the profound impact humans bring to their evaluation of the environmental components. The paper focuses primarily on the inhabitants’ attitudes to the environmental values of their place of residence in relation to things such as the condition and accessibility of green areas, air quality, potable water quality and noise intensity. The surveys indicate that views on the city’s environmental values are determined by numerous factors, such as the city’s territorial structure (districts) and its demographic structure (sex, age), and psychosocial features, such as a subjective sense of mental well-being.

  • THE ESSENCE OF THE TRANSFORMATION OF SOCIO-ECONOMIC RELATIONS IN THE NATIONAL ECONOMY: THEORETICAL AND METHODOLOGICAL ASPECT
    • Piotr Buła
    • Oleksandr Melnychenko
    2023 Pełny tekst Acta Universitatis Lodziensis. Folia Geographica Socio-Oeconomica

    The article is devoted to a thorough study of the theoretical and methodological foundations of the essence of the transformation of socio-economic relations of the national economy. Based on the study of scientific sources, a proper definition of the concept of "transformation of socio-economic relations" was formed. It is proposed to consider transformational processes from the point of view of their direct or indirect impact on other sectors and the economy in general. The need to understand and perceive the essence of transformation from the point of view of the transformation of socio-economic relations as such is well-founded. The article formulates the author's approaches to identifying the types of transformation of socio-economic relations, it’s possible and confirmed forms of manifestation, basic characteristics and features. The author's understanding of the concept of transformation potential of socio-economic relations of the national economy and the transformation cycle is outlined. A vision of the intensity, efficiency and frequency of transformational changes and the limits of transformation was formed. Characterization of the period and stages of transformational changes that lead to socio-economic shocks and cause socio-economic instability, periods of fluctuations, including ups and downs, socio-economic crisis, transformational trap is made

  • The evolution of education spaces - from plan as generator to regenerative architecture, virtual rooms and green campuses
    • Jakub Szczepański
    • Lucyna Nyka
    2023 Pełny tekst Global Journal of Engineering Education

    The study programmes are often considered the main formative factors in the process of educating future architects. Another highly influential component is the architectural characteristics of learning spaces, and consequently the impact of the physical built environment on the quality of education has been widely discussed. However, not often do we realise that the characteristics of education spaces correlate with the organisational structure of schools of architecture. Thus, the purpose of this article is to identify the trends in the evolution of educational spaces for training future architects, and investigate how much their characteristics have always been dependent on the architectural theories of the time and correlated with the organisational structure of the schools of architecture. The conclusions allow to draw a postulate that not only spaces ought to be in a focus of prospective future transformations, but also re-thinking the organisational structure of the schools of architecture.

  • The Finite Elements Method application to assesment the impact of turbulence generated by wind turbines on their lacation inclose proximity of overhead high voltage power transmissionlines
    • Waldemar Kamrat
    2023 Gaz, Woda i Technika Sanitarna

    The paper presents selected aspects of construction of wind turbines location concerning aerodynamic impact on power lines. Reaserch is based on the source data concerning the aerodynamic impact of a wind farm consisting of 8 turbines and 400 kV power line, an analysis of the possibility of wind farm locating in the immediate vicinity of the line was carried out. There are serious problems with locating higher capacity wind farms in the context of their connection to the transmission grid. Reaserch facilitate the wind farm location in proximity of an overhead high-voltage power transmission line maintaining safety and efficiency.

  • The fracture behaviour of notched PMMA specimens under simple loading conditions – Tension and torsion experimental tests
    • Elżbieta Bura
    • Andrzej Seweryn
    2023 Pełny tekst ENGINEERING FAILURE ANALYSIS

    This paper presents the results of experimental testing of flat PMMA specimens during uniaxial loading conditions. Two separate tests were conducted: tensile and torsion. The specimens were weakened with V-type edge notches with different root radii: 0.5; 2 and 10 mm. The specimens were made in two thickness variants: 5 and 15 mm. Monotonic tensile and torsion tests were carried out while keeping the averaged strain rate constant, due to the strong influence of this parameter on the PMMA behaviour. The procedure for non-contact measurement of the torsion angle using the ARAMIS 3D 4 M vision system is described. A set of PHANTOM cameras was used in the study, thanks to which all fracture processes were recorded. The processing of the obtained recordings made it possible to precisely indicate the moment (critical value of tensile force, torsional moment) and the location of crack initiation, as well as determine the nature of their evolution. Microscopic observations showed the structure of the failure surface and clearly indicated the different initiation sites observed for the two simple loading states. Different crack initiation angles were indicated, depending on the type of test conducted, as well as the notch root radius. The material in the article provides a starting point for numerical modelling of the fracture processes of notched elements and verifying the fracture criteria.

  • The Idea of a Student Research Project as a Method of Preparing a Student for Professional and Scientific Work
    • Krzysztof Nowicki
    • Mariusz Kaczmarek
    • Paweł Czarnul
    2023 Pełny tekst

    In the paper we present the idea and implementation of a student research project course within the master’s program at the Faculty of Electronics, Telecommunications and Informatics, Gdansk Tech. It aims at preparing students for performing research and scientific tasks in future professional work. We outline the evolution from group projects into research project and the current deployment of both at bachelor’s and master’s levels respectively, management of projects i.e. steps, reporting and monitoring at both faculty and individual project’s levels within our custom-built Research Project System (RPS). We further elaborate on adopted formal settings and agreements especially considering the possibility of external clients taking part in the projects. Methodology of conducting and several examples of awarded projects are presented along with statistics on the number of submitted/conducted projects as well as those finalized with actual submitted/published research papers/patents proving actual (inter)national impact of the course.

  • The Idea of Using Adhesive Bonds in Shaping of Cold-formed Thin-walled Beam-columns
    • Marcin Kujawa
    • Antonio Cazzani
    • Łukasz Smakosz
    • Violetta Konopińska-Zmysłowska
    • Karol Winkelmann
    • Faizullah Jan
    • Czesław Szymczak
    2023

    The chapter concerns the idea of using adhesive bonds in the shaping of cold-formed thin-walled beam-columns. The idea of adhesive-bonded connections is not new but is unlikely to have been used in the design and shaping of thin-walled beam-columns in civil engineering up to date. Metal bar structures, including (due to economic reasons) thin-walled structures, are the most common and effective means to build engineering superstructures/loadbearing structures. Over the years, classical techniques of connection between individual structural elements, such as bolting or welding, have mainly been used. However, the classical types of connections have their disadvantages, eliminable by using less conventional solutions, e.g. the adhesive-bonded connections. The use of structural adhesives in engineering, particularly in metal construction design, unfortunately still raises questions about their durability and load-bearing capacity. An important issue in the case of bonded structures is the effect of creep on the behavior of such joints. These issues undoubtedly require further research in the context of bonded joints. The topic still needs fundamental research of empirical and theoretical nature that will contribute to the acquisition of new knowledge on the mechanical phenomena occurring in adhesively bonded metal structures. The authors also expect that in the long run, the idea will be widely used in modern-day civil engineering.

  • The Impact of Contemporary Technology on Shell Structures: Material and Light Solutions
    • Jan Cudzik
    • Aygün Atasoy
    2023 Journal of the International Association for Shell and Spatial Structures

    With the development of technology and the materials used, shell structures have developed into more complex forms. This article is a comparison between contemporary and historical shell structures. The change is an effect of the evolution in the design process that is the result of parametric design thinking. The study aims to investigate the impact of new technologies on the architectural form of shell structures. Was there any pivot point in the history of shell structures? The secondary objective of the study is the focus on lighting in such forms and their evolution with the view of the evolution of lighting solutions applied in architecture. With the use of new technologies, shell structures can have a new form and complex detail. They may vary in scale from small objects to large-scale structures.

  • The impact of filler thermomechanical modifications on static and dynamic mechanical performance of flexible foamed polyurethane/ground tire rubber/zinc borate composites
    • Aleksander Hejna
    • Paulina Kosmela
    • Adam Olszewski
    • Krzysztof Formela
    • Łukasz Zedler
    • Adam Piasecki
    • Katarzyna Skórczewska
    2023 Composites Theory and Practice

    The rapid development of the automotive industry is very beneficial to many aspects of human life, but it is also a very significant environmental burden. The most straightforward impact is related to the generation of exhaust, but the management of post-consumer car parts is also a major challenge. Among them, waste tires are very burdensome due to their enormous numbers. Therefore, it is essential to develop novel, environmentally friendly methods for their disposal, which would reduce their environmental impacts. One of the most promising approaches is shredding, resulting in the generation of ground tire rubber (GTR), which can be introduced into polymeric materials as a filler. The presented work is related to the thermomechanical treatment of GTR in a twin-screw extruder assisted by zinc borate (ZB), whose incorporation is aimed to increase interparticle friction within the extruder barrel. The impact of the treatment conditions on the particle size and surface development of the GTR/ZB compositions was evaluated. Modified GTR was introduced into flexible polyurethane (PU) foams, and the impact on the static and dynamic mechanical performance of the resulting composites was investigated. Increasing the treatment temperature occurred to have an adverse effect on the tensile performance of the composites due to the agglomeration of GTR particles limiting the efficiency of stress transfer, which was also confirmed by dynamic mechanical analysis. On the other hand, increasing the ZB share in the GTR/ZB compositions limited PU disruptions related to the reactivity of the GTR functional groups with isocyanates, which enhanced the mechanical performance of the composites. It was proven that the proposed method of GTR thermomechanical treatment assisted by ZB might benefit the performance of flexible PU foamed composites, which could broaden the application range of GTR and provide novel ways for its efficient utilization

  • The Impact of Generative AI and ChatGPT on Creating Digital Advertising Campaigns
    • Edyta Gołąb-Andrzejak
    2023 CYBERNETICS AND SYSTEMS

    The use of AI-based solutions is currently discussed in relation to various industries. The proliferation of tools based on generative artificial intelligence (GAI), including the emergence of ChatGPT, has resulted in testing as a first step and implementations in further areas of business life, including marketing, as a second step. Still only a few studies have analysed and evaluated specific solutions for different areas of marketing, including advert design. In order to fill this gap, areas where GAI and ChatGPT are used during the various stages of creating a digital advertising campaign have been identified. Therefore, the aim of this paper is to investigate the impact of GAI and ChatGPT on theory and practice on different stages of the digital advertising campaign building process. This objective is followed by a research question: how can marketers use GAI and ChatGPT to create an effective digital advertising campaign? The process of building a digital advertising campaign should be considered and analysed in terms of the impact of using GAI and ChatGPT technology and, at the same time, the role played by marketers at each stage and their contribution to this process in collaboration with GAI-based tools. This article is intended as a preliminary exploration of the impact of using GAI and ChatGPT on the digital marketing campaign building process. Therefore, the methodology applied includes critical literature analysis, secondary data analysis and individual in depth interview (IDI) with an expert (CEO of a creative agency). This represents a first step in the study, to be followed by in-depth empirical research (qualitative as well as quantitative) to verify and develop the conclusions drawn. The article analyses the impact of using generative AI and ChatGPT on the process of creating an advertising campaign in digital media from a theoretical and practical point of view. Theoretical and managerial implications are also presented.

  • The impact of hydrological research, municipal authorities, and residents on rainwater management in Gdańsk (Poland) in the process of adapting the city to climate change
    • Michał Szydłowski
    • Khansa Gulshad
    • Andam Mustafa
    • Wojciech Szpakowski
    2023 Pełny tekst Acta Scientiarum Polonorum Formatio Circumiectus

    Aim of the study The city of Gdańsk faces changing climatic conditions that result in a higher frequency of extreme weather events. In response to the increasingly frequent appearance of flash floods, scientific research was carried out on changes in the probability of the occurrence of maximum daily precipitation in Gdańsk. The purpose of this paper is to show the role of hydrological research (science), decisions of local authorities and the engagement of residents in the process of adapting Gdańsk to climate change. Material and methods The hydrological analysis was carried out using rainfall observations from the Gdańsk Rębiechowo station (1974-2021). Log-normal distribution was used as a statistical model for the precipitation probability distribution. To show the role of the city authorities’ decisions, the methodology developed and used by Gdańsk Water company for rainwater management was presented. To emphasize the importance of city residents in climate adaptation process, the methods adopted by city authorities to involve citizens in the advisory process are discussed, namely Civic Panels and the Gdańsk Climate Change Forum. Results and conclusions The probability distributions of maximum precipitation for different periods were developed, showing a substantial increase of precipitation with a probability of p=1%. Consequently, changes were introduced in the rainwater management practices by the company Gdańsk Water. Being aware of rising flood hazard, Gdańsk City Hall has embraced a plan for adapting the city to climatic changes by 2030. The local authorities decided to involve citizens in the decision-making process. To this end, discussion panels were organized, and the Gdańsk Climate Change Forum was initiated.

  • The implementation of green transformation through clusters
    • Anna Lis
    • Marta Mackiewicz
    2023 ECOLOGICAL ECONOMICS

    The paper addresses a poorly documented issue in the literature, namely the role of clusters in green transformation, including processes related to green, low-carbon, and circular economies. The purpose was to identify and understand the practices of clusters in this area. The adopted mixed research strategy consisted of both qualitative and quantitative research. Both research phases were conducted in a group of Polish Key National Clusters. Through qualitative research, the authors abductively identified practices that are vital for green transformation and categorized them into three thematic areas: Integration, Access to resources, and Education and awareness building. On this basis, the authors developed a method to measure the clusters’ level of advancement in green practices, which was used in quantitative research. The results show that the surveyed clusters undertake a number of practices to promote green transformation. They are active in each of the distinguished areas and also engage in its most demanding forms. The study sheds new light on the concept of the clusters, showing how such organizations can be used as agents of change in favor of green transformation.

  • The importance of anchoring ligands of binuclear sensitizers on electron transfer processes and photovoltaic action in dye-sensitized solar cells
    • Aleksandra Bartkowiak
    • Oleksandr Korolevych
    • Błażej Gierczyk
    • Daniel Pelczarski
    • Alberto Bossi
    • Maciej Klein
    • Łukasz Popenda
    • Waldemar Stampor
    • Małgorzata Makowska-janusik
    • Maciej Zalas
    2023 Pełny tekst Scientific Reports

    The relatively low photon-to-current conversion efficiency of dye-sensitized solar cells is their major drawback limiting widespread application. Light harvesting, followed by a series of electron transfer processes, is the critical step in photocurrent generation. An in-depth understanding and fine optimization of those processes are crucial to enhance cell performance. In this work, we synthesize two new bi-ruthenium sensitizers with extended anchoring ligands to gain insight into underlying processes determining photovoltaic action mechanisms. The structure of the compounds has been confirmed, and their properties have been thoroughly examined by various techniques such as NMR, IR, elemental analysis UV–Vis, cyclic voltammetry, and electroabsorption. The experimental characterization has been supported and developed via extensive quantum-chemical calculations, giving a broad view of the presented molecules’ properties. Finally, the DSSC devices have been assembled utilizing obtained dyes. The photovoltaic and EIS measurements, combined with performed calculations and fundamental dyes characterization, unraveled an intramolecular electron transfer as an initial step of the electron injection process at the dye/semiconductor interface. The overall photovoltaic action mechanism has been discussed. Our study demonstrates the significance of the anchoring group architecture in the molecular design of new sensitizers for DSSC applications.

  • The influence of magnetic particle incorporation on bisphenol A removal by β-cyclodextrin-derived sorbent
    • Natalia Łukasik
    • Sandra Wikarska
    • Hanna Świątek
    • Marcin Łapiński
    • Tomasz Klimczuk
    • Koleta Hemine
    2023 CHEMOSPHERE

    A novel, biomass-derived hybrid sorbent Ban-CD-EPI-Fe was successfully synthesized in a coprecipitation method, in which β-cyclodextrin copolymerized with banana peel extract and epichlorohydrin was grafted onto an iron oxide surface. The composition, presence of functional groups, morphology, thermal stability, and magnetic properties of the obtained material were characterized by Powder X-Ray Diffraction (XRD), X-Ray Photoelectron Spectroscopy (XPS), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy and Energy Dispersive X-Ray Spectroscopy (SEM-EDS), Thermogravimetric Analysis (TGA), and Physical Properties Measurement System (PPMS). The material bearing around 28 % of β-cyclodextrin units has mesoporous structure with plate-like morphology and active surface area determined by BET and Langmuir models equal to 38.35 and 53.59 m2 g-1, respectively. The sorption studies aimed to remove an endocrine disruptor – bisphenol A (BPA), from water. The results showed that the time evolution could be fitted with pseudo-second kinetic order with a rate constant k equal to 0.05 g mg-1 min-1. According to the Langmuir isotherm, a monolayer is created during BPA sorption, and the maximum sorption capacity was estimated as 93.5 mg g-1. After BPA sorption, the hybrid material could be easily separated by an external magnet and regenerated under mild conditions keeping its recyclability in at least eight cycles.