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Öğe Investigation on structural and adsorptive features of BaO modified zeolite powders prepared by ball milling technique: Removal of tetracycline and various organic contaminants(Elsevier B.V., 2023) Kanmaz, Nergiz; Buğdaycı, Mehmet; Demirçivi, PelinIn the current study, the removal of tetracycline (TC) antibiotic via BaO-doped zeolite (80BaO@zeolite), which synthesized by ball-mill technique, from water by adsorption process was studied. The structure and properties of 80BaO@zeolite was determined by XRD, FTIR, SEM and BET/N2. TC adsorption capacity of 71.4 mg g?1 was obtained for 80BaO@zeolite. The Langmuir isotherm model was found to be compatible for 80BaO@zeolite. The kinetic results indicate that the adsorption rate is compatible with the pseudo second order model and the time for the adsorption to reach equilibrium was achieved as 360 min. Maximum TC removal was obtained at pH:10, in the presence of NaCl and CaCl2 salts, and compared to in tap water drinking water and distilled water. The sorption process has shown thermodynamically exothermic and spontaneous nature. The desorption of TC molecules attached to the 80BaO@zeolite surface was investigated using different eluents. The 88% TC removal and 94% TC recovery rates achieved in the first cycle with the 1 M NaOH eluent decreased to 72% and 70%, respectively, in the fourth cycle. High adsorption capacities of 161.3 mg g?1, 59.3 mg g?1 and 85.5 mg g?1were obtained in the removal of malachite green, murexide and basic violet-16, respectively.Öğe Microstructural engineering for bioenergy production(2024) Başlayıcı, Serkan; Demirçivi, PelinThe worldwide demand for renewable energy sources has led to increased interest surrounding bioenergy production methods; however, significant challenges exist regarding efficient cost-effective methods. The field of microstructural engineering holds a promise to address these limitations by manipulating materials at a microscopic level to improve performance in various processes necessary for producing reliable or sustainable energy products from biomass feedstocks or catalysts used in these systems. Microstructural engineering optimizes porous structures, surface areas, and morphologies among other properties that can affect efficiencies in conversions, leading to better performing low-cost operations capable of providing more stable robust outcomes that are essential in today’s market. The use of techniques like templating, self-assembly, and sol-gel methods provides an additional avenue for researchers to develop tailor-made material microstructures that are industry-specific and to provide significant performance improvements. A promising development in bioenergy production is microstructural engineering. By using this cutting-edge technology, we can work toward achieving more sustainable and efficient energy production, ultimately paving the way for an exciting future in renewable energy.Öğe Solvent-free mechanochemical synthesis of TiO2-ethyl cellulose biocomposite for adsorption of tetracycline and organic dyes(Elsevier B.V., 2023) Kanmaz, Nergiz; Buğdaycı, Mehmet; Demirçivi, PelinIn the study, polymeric-metal oxide hybrid composite was synthesized by mechanochemical method in ball-mill by adding different amounts of TiO2 to ethyl cellulose (EC) and its potential in tetracycline (TC) removal from aqueous solutions was investigated. In order to investigate the adsorption capacity, isotherm, kinetic and thermodynamic parameters of the adsorption process, the amount of adsorbent, contact time, solution pH, temperature effect, inert electrolyte effect and different water environment effects were experimentally carried out in batch adsorption experiments. The adsorption capacity of all sorbents was conformed according to the Freundlich isotherm model and the maximum capacity is found for 80%TiO2@EC with 23.26 mg g?1. The system reached equilibrium with 89% TC removal in 480 min and complied with the pseudo second order kinetic model. In the pH effect experiments, maximum TC removal found in pH:6. Thermodynamic parameters indicate that TC adsorption on 80%TiO2@EC is endothermic and spontaneous. Different water medium and inert electrolyte effect were found compatible with each other. Also, a decrease was observed in the specific TC removal in the presence of any ions in the system. The removal of methylene blue (MB) and malachite green (MG) azo dyes as another organic environmental pollutant was also studied and their adsorption capacities were found as 105.7 mg g?1 and 109.9 mg g?1, respectively. XRD, FTIR and SEM analyzes were performed to explain the interaction mechanism between sorbent samples and TC.Öğe Synthesis of CuBDC metal-organic framework supported zinc oxide via ball-milling technique for enhanced adsorption of Orange-II(Elsevier B. V., 2024) Yardımcı, Batuhan; Kanmaz, Nergiz; Buğdaycı, Mehmet; Demirçivi, PelinFor the first time, copper-based metal-organic framework (CuBDC) supported ZnO composite was successfully prepared by the ball-milling method for effective adsorption of anionic azo orange-II (OII) dye. After comparing the OII adsorption performances of ZnO and composites, with two different CuBDC support ratios, focused on the investigation of 1:1 CuBDC@ZnO. The crystal structures, physicochemical properties, and surface morphologies of the adsorbents were characterized by XRD, FTIR, SEM-EDX, and BET analyses. The adsorption process fitted the Langmuir isotherm model (R2=0.98) and the monolayer adsorption capacity of 1:1 CuBDC@ZnO composite was found to be 132.12 mg g?1. The adsorption process was well described by the pseudo-second-order model, which indicates the adsorption process of 1:1 CuBDC@ZnO composite on OII is chemisorption. Moreover, 1:1 CuBDC@ZnO composite can be an alternative as an effective and innovative adsorbent for the removal of toxic OII dye contaminant.Öğe Synthesis of Eu doped SrAl2O4 composite: Adsorption characteristics on tetracycline and ciprofloxacin antibiotics(Taylor and Francis Inc, 2021) Turan, Büşra; Buğdaycı, Mehmet; Benzeşik, Kağan; Demirçivi, PelinIn the present study, evaluation and characterization of Eu-Strontium aluminate(SrAl2O4) composites was studied. A new technic, volume combustion synthesis, was applied to synthesis of Eu-SrAl2O4 composites. Tetracycline (TC) and ciprofloxacin (CIP) were used to investigate the adsorption capacities of the composites. Experimental results showed that monolayer adsorption occurred for both of TC and CIP with adsorption capacities 26.24 mg g(-1) and 7.10 mg g(-1), respectively. Pseudo-second order kinetic model well described the TC and CIP adsorption with k(2) values 7(*)10(-4) and 4(*)10(-5) g mg(-1) min(-1), respectively. The highest adsorption were found at pH 7 (98%) for TC and at pH 10 (80%) for CIP. Eu-SrAl2O4 composite is a good candidate for the removal of various type of antibiotics from wastewater.
