Browsing by Author "Gül, Ayşe"

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Carbon Dioxide Absorption Using Different Solvents (MEA, NaOH, KOH and Mg(OH)2) in Bubble Column Reactor
(Bitlis Eren Üniversitesi, 2023) Gül, Ayşe; Tezcan Un, Umran; 0000-0002-2305-6408; AGÜ, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü; Gül, Ayşe Ayşe; Tezcan Un, Umran
Carbon dioxide is considered to be one of the greenhouse gases potentially responsible for climate change. The aim of this research is to reduce emissions by capturing carbon dioxide in a solution using an absorption method. The absorption capacity, absorption rate, carbon dioxide removal efficiency, and overall mass transfer coefficient of MEA (Monoethanolamin) and alkaline solvents (NaOH, KOH, Mg (OH)2) were investigated using a bubble column gas absorption reactor with counter current flow. The effects of operational parameters such as solvent concentration (0.01, 0.05, and 0.25M) and solvent type were studied. The research showed that KOH, NaOH, and MEA were more efficient in capturing CO2 than Mg (OH)2 was. For all solvent types, the total mass transfer coefficient, absorption rate, and CO2 removal efficiency were increased with the increase in the concentration of solvent. The solvent concentration is increased from 0.01 M to 0.25 M to obtain the highest KGa values for MEA, NaOH, and KOH, 3.75 1/min for MEA, 3.70 1/min for NaOH, and 3.93 1/min for KOH.The MEA, NaOH, and KOH absorption rates were maximum at 0.25 M solvent concentrations as 0.19x103 mol/Ls. The maximum CO2 removal efficiencies for MEA, NaOH, and KOH at 0.25 M solvent concentration are greater than 60%. Absorption capacity of NaOH and KOH is 0.313 mol CO2/mol NaOH and 0.316 (mol CO2/mol KOH). The highest absorption capacity, 0.576 mol CO2/mol MEA, was obtained at a solvent concentration of 0.01M MEA.
Fabrication of Gd2O3/PSF Membranes via Aqueous Phase Inversion Method
(HİTİT ÜNİVERSİTESİ, 2022) Gül, Ayşe; Şenol Arslan, Dilek; Uzal, Nigmet; 0000-0001-9639-2843; 0000-0002-2305-6408; 0000-0002-0912-3459; AGÜ, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü; Gül, Ayşe; Şenol Arslan, Dilek; Uzal, Nigmet
The purpose of this study was to look into the effect of Gadolinium oxide (Gd2O3) concentration (0.5%, 1%, and 2%) on the performance of newly developed Gd2 O3 /PSF membranes A common phase inversion method was used to create the membranes. Pure water flux and bovine serum albumin (BSA) permeation tests were used to evaluate membrane performance. FTIR and contact angle measurements were used to characterize the membranes that were manufactured. The greatest percentage of BSA rejection was 53%. In this work, the optimum membrane (2% wt Gd2O3/17% wt PSF) successfully demonstrated 53% rejection with filtrate flux for about 8.7 L/m2.h at a pressure of 10 bar.
Ni-Zn metal-organic framework based membranes for rejection of Pb (II) ions
(ELSEVIERRADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS, 2022) Senol-Arslan, Dilek; Gul, Ayse; Uzal, Nigmet; Yavuz, Emre; AGÜ, Mühendislik Fakültesi, Malzeme Bilimi ve Nanoteknoloji Mühendisliği Bölümü; Şenol Arslan, Dilek; Gül, Ayşe; Uzal, Niğmet
The present paper describes a sustainable and affordable supply of clean, and safe water approach to investigate Ni-Zn MOF embedded membrane for rejection of Pb (II) ions in aqueous solution. Ni-Zn MOF powder was prepared by solvo-thermal method, and then the Ni-Zn MOF embedded membranes with various concentrations (0.025 wt%, 0.05 wt% and 0.1 wt%). The membranes were fabricated by a common phase inversion method. Phase solutions of Pb(II) prepared with PVP at different concentrations in aqueous solutions. Water filtration and Pb (II) rejection tests were operated on a batch scale. The prepared Ni-Zn MOF powder characterized by FTIR, SEM-EDX analyses and zeta potential measurements. Ni-Zn MOF membranes were characterized by FTIR, SEMEDX analysis, contact angle, and water permeability measurements. The effects of important parameters on adsorption including concentration and pH were investigated. The obtained results indicated that the maximum rejection of Pb(II) was 98% for a feed solution containing 80 mg Pb/L at pH 8 and assistance with 2 % PVP for 0.05 wt% Ni-Zn MOF membrane. Additionally, it was detected that blend membranes revealed better Pb(II) rejection than pure PSF membrane.