Artykuły naukowe (WTiICh)
Stały URI dla kolekcji
Przeglądaj
Przeglądaj Artykuły naukowe (WTiICh) wg Temat "carbon spheres"
Teraz wyświetlane 1 - 8 z 8
Wyników na stronę
Opcje sortowania
Pozycja Open Access CO2 Adsorption Study of Potassium‐Based Activation of Carbon Spheres(MDPI, 2022-07-05) Pełech, Iwona; Staciwa, Piotr; Sibera, Daniel; Pełech, Robert; Sobczuk, Konrad S.; Kayalar, Gulsen Yagmur; Narkiewicz, Urszula; Cormia, Robert; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej; Department of Chemical and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej; Department of Chemical and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej; Department of Chemical and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin; Faculty of Civil and Environmental Engineering, West Pomeranian University of Technology in Szczecin; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej; Department of Chemical and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej; Department of Chemical and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin; Department of Chemical Engineering, Faculty of Engineering, Eskişehir Technical University, 26555 Eskişehir, Turkey; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej; Department of Chemical and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin; Chemistry Faculty, Chemistry Department, Foothill CollegeThe adsorption properties of microporous spherical carbon materials obtained from the resorcinol-formaldehyde resin, treated in a solvothermal reactor heated with microwaves and then subjected to carbonization, are presented. The potassium-based activation of carbon spheres was carried out in two ways: solution-based and solid-based methods. The effect of various factors, such as chemical agent selection, chemical activating agent content, and the temperature or time of activation, was investigated. The influence of microwave treatment on the adsorption properties was also investigated and described. The adsorption performance of carbon spheres was evaluated in detail by examining CO2 adsorption from the gas phase.Pozycja Open Access CO2 Sorbents Based on Spherical Carbon and Photoactive Metal Oxides: Insight into Adsorption Capacity, Selectivity and Regenerability(MDPI, 2022-10-11) Pełech, Iwona; Kusiak-Nejman, Ewelina; Staciwa, Piotr; Sibera, Daniel; Kapica‐Kozar, Joanna; Wanag, Agnieszka; Latzke, Filip; Pawłowska, Karolina; Michalska, Adrianna; Narkiewicz, Urszula; Morawski, Antoni W.Pozycja Open Access The Effect of the Modification of Carbon Spheres with ZnCl2 on the Adsorption Properties towards CO2(MDPI, 2022-02) Pełech, Iwona; Staciwa, Piotr; Sibera, Daniel; Kusiak-Nejman, Ewelina; Morawski, Antoni W.; Kapica-Kozar, Joanna; Narkiewicz, Urszula; Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin; Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin; Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, Department of General Civil Engineering, Faculty of Civil and Environmental Engineering, West Pomeranian University of Technology in Szczecin; Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin; Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin; Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin; Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in SzczecinZinc chloride and potassium oxalate are often applied as activating agents for carbon materials. In this work, we present the preparation of ZnO/carbon spheres composites using resorcinol-formaldehyde resin as a carbon source in a solvothermal reactor heated with microwaves. Zinc chloride as a zinc oxide source and potassium oxalate as an activating agent were applied. The effect of their addition and preparation conditions on the adsorption properties towards carbon dioxide at 0 degrees C and 25 degrees C were investigated. Additionally, for all tested sorbents, the CO2 sorption tests at 40 degrees C, carried out utilizing a thermobalance, confirmed the trend of sorption capacity measured at 0 and 25 degrees C. Furthermore, the sample activated using potassium oxalate and modified using zinc chloride (a carbon-to-zinc ratio equal to 10:1) displayed not only a high CO2 adsorption capacity (2.69 mmol CO2/g at 40 degrees C) but also exhibited a stable performance during the consecutive multicycle adsorption-desorption process.Pozycja Open Access Influence of Potassium-Based Activation on Adsorptive Properties of Carbon Spheres Modified with Iron(III) Citrate(MDPI, 2023-07-25) Pełech, Iwona; Sibera, Daniel; Staciwa, Piotr; Sobczuk, Konrad S.; Narkiewicz, Urszula; West Pomeranian University of Technology in Szczecin, Department of Inorganic Chemical Technology and Environmental Engineering, 70-322 Szczecin, ul Pułaskiego 10, Poland; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej. Katedra Technologii Chemicznej Nieorganicznej i Inżynierii Środowiska.; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Budownictwa i Inżynierii Środowiska.Composites synthesized from iron(III) citrate and carbon spheres, and activated with potassium compounds were prepared and then characterized using XRD, SEM, and low-temperature nitrogen adsorption methods. The adsorption properties of the composites toward carbon dioxide were assessed using CO2 uptake measurement, as well as by measuring their selectivity toward carbon dioxide, given their further application as photocatalysts for the reduction of this gas. The effect of changing preparation conditions on the structural and adsorption properties of the material was assessed. The potential strength of such material is a synergistic effect between the high adsorption capacity related to the microporosity of carbon spheres combined with the catalytic properties of iron particles.Pozycja Open Access The influence of the synthesis pH on the morphology and adsorption properties of carbon spheres(Elsevier, 2023-07-13) Sobczuk, Konrad S.; Pełech, Iwona; Narkiewicz, Urszula; Staciwa, Piotr; Sibera, Daniel; Moszyński, Dariusz; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej; Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej; Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej; Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej; Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej; Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering; Faculty of Civil and Environmental Engineering, West Pomeranian University of Technology in Szczecin; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej; Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and EngineeringMicroporous spherical carbon materials were obtained from the resorcinol–formaldehyde resin, treated in a solvothermal reactor heated with microwaves, and then subjected to carbonization. The effect of the pH on the changes in the carbon spheres' morphology and the adsorption performance was investigated. In order to improve the adsorption efficiency, carbon spheres were subjected to the activation using potassium hydroxide and their properties were compared to those of the non-activated ones. The adsorption performance of the produced materials was evaluated in detail by examining nitrogen and carbon dioxide adsorption from the gas phase, the morphology – using Scanning Electron Microscopy, and surface chemistry – using X-ray Photoelectron Spectroscopy.Pozycja Open Access On the Selectivity of Simultaneous CO2 and N2 Reduction Using TiO2/Carbon Sphere Photocatalysts Prepared by Microwave Treatment and Mounted on Silica Cloth(MDPI, 2023-08-24) Kusiak-Nejman, Ewelina; Ćmielewska, Katarzytna; Pełech, Iwona; Ekiert, Ewa; Staciwa, Piotr; Sibera, Daniel; Wanag, Agnieszka; Kapica-Kozar, Joanna; Gano, Marcin; Narkiewicz, Urszula; Morawski, Antoni Waldemar; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Budownictwa i Inżynierii Środowiska. Katedra Budownictwa Ogólnego; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej. Katedra Technologii Chemicznej Nieorganicznej i Inżynierii Środowiska; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej. Katedra Technologii Chemicznej Organicznej i Materiałów Polimerowych; West Pomeranian University of Technology in Szczecin. Faculty of Chemical Technology and Engineering. Department of Inorganic Chemical Technology and Environment Engineering; West Pomeranian University of Technology in Szczecin. Faculty of Civil and Environmental Engineering. Department of General Civil Engineering; West Pomeranian University of Technology in Szczecin. Faculty of Chemical Technology and Engineering. Department of Chemical Organic Technology and Polymeric MaterialsThis paper presents new photocatalysts obtained by treating carbon spheres (CS) and TiO2 in a microwave reactor at a pressure of 20 atm and a temperature of up to 300 °C for 15 min and then depositing TiO2/CS composites on glass fibre cloths. Such highly CO2-adsorbing photocatalysts showed photoactivity in the simultaneous water-splitting process, generating H2, reducing CO2 to CO and CH4, and reducing N2 to NH3. In addition, calculations of the hydrogen balance involved in all reactions were performed. Adding 1 g of carbon spheres per 1 g of TiO2 maintained the high selectivity of nitrogen fixation at 95.87–99.5%, which was continuously removed from the gas phase into the water as NH4+ ions.Pozycja Open Access Pressureless and Low-Pressure Synthesis of Microporous Carbon Spheres Applied to CO2 Adsorption(MDPI, 2020-10-13) Pełech, Iwona; Sibera, Daniel; Staciwa, Piotr; Narkiewicz, Urszula; Cormia, Robert; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej; Department of Chemical and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej; Department of Chemical and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin; Faculty of Civil and Environmental Engineering, West Pomeranian University of Technology in Szczecin; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej; Department of Chemical and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej; Department of Chemical and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin; Chemistry Faculty, Chemistry Department, Foothill CollegeIn this work, low-pressure synthesis of carbon spheres from resorcinol and formaldehyde using an autoclave is presented. The influence of reaction time and process temperature as well as the e ect of potassium oxalate, an activator, on the morphology and CO2 adsorption properties was studied. The properties of materials produced at pressureless (atmospheric) conditions were compared with those synthesized under higher pressures. The results of this work show that enhanced pressure treatment is not necessary to produce high-quality carbon spheres, and the morphology and porosity of the spheres produced without an activation step at pressureless conditions are not significantly di erent from those obtained at higher pressures. In addition, CO2 uptake was not a ected by elevated pressure synthesis. It was also demonstrated that addition of the activator (potassium oxalate) had much more e ect on key properties than the applied pressure treatment. The use of potassium oxalate as an activator caused non-uniform size distribution of spherical particles. Simultaneously higher values of surface area and total pore volumes were reached. A pressure treatment of the carbon materials in the autoclave significantly enhanced the CO2 uptake at 25 C, but had no e ect on it at 0 C.Pozycja Open Access ZnO/Carbon Spheres with Excellent Regenerability for Post-Combustion CO2 Capture(MDPI, 2021-10-28) Pełech, Iwona; Sibera, Daniel; Staciwa, Piotr; Kusiak-Nejman, Ewelina; Kapica-Kozar, Joanna; Wanag, Agnieszka; Narkiewicz, Urszula; Morawski, Antoni W.; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej. Katedra Technologii Chemicznej Nieorganicznej i Inżynierii Środowiska; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Budownictwa i Inżynierii Środowiska. Katedra Budownictwa Ogólnego; West Pomeranian University of Technology in Szczecin. Faculty of Chemical Technology and Engineering. Department of Inorganic Chemical Technology and Environment Engineering; West Pomeranian University of Technology in Szczecin. Faculty of Civil and Environmental Engineering. Department of General Civil EngineeringThis paper examines the synthesis of the ZnO/carbon spheres composites using resorcinol—formaldehyde resin as a carbon source and zinc nitrate as a zinc oxide source in a solvothermal reactor heated with microwaves. The influence of activation with potassium oxalate and modification with zinc nitrate on the physicochemical properties of the obtained materials and CO2 adsorption capacity was investigated. It was found that in the case of nonactivated material as well as activated materials, the presence of zinc oxide in the carbon matrix had no effect or slightly increased the values of CO2 adsorption capacity. Only for the material where the weight ratio of carbon:zinc was 2:1, the decrease of CO2 adsorption capacity was reported. Additionally, CO2 adsorption experiments on nonactivated carbon spheres and those activated with potassium oxalate with different amounts of zinc nitrate were carried out at 40 °C using thermobalance. The highest CO2 adsorption capacity at temperature 40 °C (2.08 mmol/g adsorbent) was achieved for the material after activation with potassium oxalate with the highest zinc nitrate content as ZnO precursor. Moreover, repeated adsorption/desorption cycle experiments revealed that the as-prepared carbon spheres were very good CO2 adsorbents, exhibiting excellent cyclic stability with a performance decay of less than 10% over up to 25 adsorption-desorption cycles.