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- 저자 : Omar Alagha (검색결과 2 건)
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Arfa Iqbal,Emre Cevik,Omar Alagha,Ayhan Bozkurt 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-
This study reports the removal of methylene blue dye (MB) from aqueous solutions by ultra-efficientbatch adsorption and membrane filtration using novel nitrogen-doped multilayer molybdenum carbideand molybdenum oxide nanosheets (NMoC@Mo). During batch adsorption studies, a complete MB dyeremoval (99.8%) was achieved against considerably high dye concentration (200 ppm) in a very shortduration (7 min) using 4 mg of adsorbent dose. The equilibrium studies confirmed that the adsorptiondata followed Langmuir adsorption isotherm with a maximum monolayer coverage adsorbent capacityof 204 mg g1. Reusability study of the NMoC@Mo nanosheets revealed that the adsorption (96%) /desorption(90%) efficiency of the adsorbent remained very high upto five consecutive cycles. the A costeffectivegravity driven membrane filtration studies were performed without applying any external pressure. Membranes (M-10, M-40, and M-60) containing three different loadings of NMoC@Mo (10 mg,40 mg, and 60 mg, respectively) into the polyvinyl difluoride (PVDF) doped solutions were exhibited amaximum dye removal of almost 85% achieved with M-40 membrane. Moreover, M-40 membrane exhibitedimproved hydrophilicity (contact angle: 79.94), water flux (53.35 L/m2-h), and improved antifoulingproperties. The results supported the immense potential and economic feasibility of NMoC@Mo in MBdye removal using both adsorption and membrane filtration processes.
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Seyda T. Gunday,Emre Cevik,Ismail Anil,Omar Alagha,Hussein Sabit,Ayhan Bozkurt 한국고분자학회 2020 Macromolecular Research Vol.28 No.12
The current research aimed to produce anhydrous gel organic electrolytes with superior performance for high-temperature supercapacitor applications. Within this scope, anhydrous electrolytes were designed by the termination of 1,4- butanediol diglycidyl ether (BDE) with 5-aminotetrazole (AT). The BDE(AT)2 was further doped with phosphoric acid (PA) and 1-Ethyl-3-methylimidazolium tetrafluoroborate (EMT, as an ionic liquid) at varied ratios. The structure of fabricated electrolytes was elucidated with various spectroscopic techniques, and thermal studies confirmed high thermal stabilities and low glass transition temperatures, suggesting that they could be used in a wide temperature range. Different supercapacitor systems, in combination with carbon-based electrodes and BDE(AT)2, BDE(AT)2-0.1EMT, and BDE(AT)2-PA-0.1EMT electrolytes, were constructed. The supercapacitor device in combination with BDE(AT)2-PA-0.1EMT electrolyte, showed the highest ionic conductivity value of 1.2×10-4 S cm-1. The electrode/electrolyte combination demonstrated a maximum specific capacitance (80.4 F g-1), the highest specific energy (2.91 Wh kg-1), and highly effective electrochemical reversibility (up to 2.250 cycles). The supercapacitor device illustrated a better performance at higher temperatures in terms of its specific capacitance value.
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