WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collections

Permanent URI for this collectionhttps://hdl.handle.net/20.500.13091/2

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Citation - WoS: 1
Citation - Scopus: 1
Cleaning of Fine-Grained Lignite by Two-Stage Hydrophobic Flocculation Using Different Waste Oils
(Taylor and Francis Ltd., 2025) Abdelraheem, M.T.O.; Agca, O.; Agacayak, T.; Duzyol, S.
In this study, the conditions for obtaining clean coal from fine-grained lignite suspensions by two-stage hydrophobic flocculation using different waste oils were investigated. Waste vegetable oil, waste hydraulic oil and waste engine oil were chosen as bridging liquids for hydrophobic flocculation tests. During the studies, sodium silicate was used as the dispersant. Acetone was used at each stage to clean the floc obtained from the agglomeration process. The ash content (%) and combustible recoveries (CR, %) of the floc obtained at the end of each experiment were determined. In addition, contact angle (θ) and calorific values (kcal/kg) were measured and the results were evaluated in detail. At the end of the cleaning stages, low ash clean coal was obtained with a very high combustible recovery. In addition, it was observed that the calorific values increased considerably from 5128 to 5772,5558 to 6304 and 5447 to 5732 using waste vegetable oil, waste hydraulic oil and waste engine oil, respectively. © 2024 Taylor & Francis Group, LLC.
Eco-Friendly Leaching of Metallic Silver With Boric Acid: Kinetics Study
(Chemical Society of Ethiopia, 2025) Boyrazlı, M.; Abdelraheem, M.T.O.; Aydoǧan, S.; Ali, B.; Mammadov, K.
This article discusses the kinetics of using a hydrogen peroxide solution to dissolve pure metallic silver in boric acid. The impact of temperature, rotation speed, hydrogen peroxide (H2O2) concentration, and boric acid concentration were investigated. The results indicate that silver dissolution rate and rotation speed have a positive relationship. Additionally, boric acid concentrations ranging from 0.10 to 0.40 M significantly enhance the dissolution process. The hydrogen peroxide concentration has no discernible influence on the rate of dissolution. While temperatures between 20 and 40 °C are beneficial, temperatures above 40 °C had the opposite effect and caused a layer of boron oxide (B2O3) to form. The activation energy was determined to be 30.49 kJ/mol. © 2025 Chemical Society of Ethiopia and The Authors.
Citation - WoS: 2
Citation - Scopus: 1
Leaching Kinetics of Metallic Silver With Sodium Cyanide in Hydrogen Peroxide Solution
(John Wiley and Sons Inc, 2025) Aydogan, S.; Abdelraheem, M.T.O.; Ali, B.; Boyrazli, M.
This article describes the kinetics of dissolving pure metallic silver (Ag) in sodium cyanide with a hydrogen peroxide (H2O2) solution. The impacts of temperature, sodium cyanide concentration, rotation speed, and H2O2 concentration were investigated. The findings demonstrate that a favourable relationship exists between the rate of silver dissolution and the rotation speed. Moreover, sodium cyanide concentration of 0.0125 M was sufficient to dissolve silver. Hydrogen peroxide concentrations between 0.05 and 0.035 M have a significant impact on the dissolution rate; however, 0.050 M concentration had an adverse effect and resulted in the formation of a silver oxide layer. Temperatures between 20 and 55°C have a positive influence because this range is where H2O2 is stable, but a temperature of 60°C decreased the silver dissolution rate due to decomposition of hydrogen peroxide. A measurement of 21.50 kJ/mol was calculated of the activation energy. © 2025 Canadian Society for Chemical Engineering.
Citation - WoS: 6
Citation - Scopus: 6
Solvent Extraction of Manganese and Zinc From Chloride Leach Solution of Spent Zn–c Batteries With Dehpa in Benzene Diluent
(Springer Science and Business Media Deutschland GmbH, 2024) Abdelraheem, M.T.O.; Aras, A.; Taner, H.A.; Agacayak, T.
The applicability of utilizing solvent extraction processes of manganese (Mn) and zinc (Zn) from chloride leachate of spent zinc–carbon (Zn–C) batteries has been studied by using di-2-ethylhexyl phosphoric acid (DEHPA) as an extractant agent. The effect of five factors (equilibrium pH, O/A ratio, temperature, extractant concentration, and diluent type) were investigated. According to the results gained, the appropriate solution pH level for DEHPA was found to be 6.5. With DEHPA (20%, v/v), 77.50% Mn and 100% Zn were extracted, within 15 min contact time at a 1:1 aqueous/organic ratio and 50 °C temperature. Also, a McCabe–Thiele diagram was drawn and one single-step extraction for Zn and a two-stage process for Mn were needed to achieve the highest extraction efficiency. ΔH as a thermodynamic parameter was calculated and found to be 18.39 kJ/mol for Mn and − 245.50 kJ/mol for Zn, respectively, indicating that the extraction process was endothermic for Mn and exothermic for Zn. A desirable stripping of Mn and Zn from the loaded organic phase could be obtained using a stripping solution of 6 M HCl. Graphical Abstract: (Figure presented.) © The Author(s) 2024.

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