Makale

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Browsing Makale by Category "Diğer"

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    Boron and Zinc Co‑doped Hydroxyapatites for Bone Tissue Engineering Applications
    (Springer Nature, 2025-07-30) Akbaba Sema; Turacli Karaguven Senem Ozge; Evis Zafer; Tezcaner Aysen
    In this study, effects of B and Zn co-doping on structural and biological properties of hydroxyapatite (HA) were investigated. Effect of co-doping on synthesized HA groups was characterized by SEM, ICP-OES, XRD, FTIR, and dynamic light scattering. It was revealed that 8 mol% B led to a decrease in particle size, whereas increasing Zn resulted in increasing mean particle size. FTIR spectra verified presence of PO4 3− and BO3 3− in the HA structure. XRD analysis revealed that both B and Zn decreased HA phase percentage, crystallinity and crystallite size. Bioactivity of the HA groups increased with presence of B and Zn. Dual effect of B and Zn on viability and proliferation of human adipose derived stem cells (hADSCs) was also investigated. It was found that 8 mol% B doped and all B & Zn-doped HA groups increased cell viability and proliferation, except 8 mol% B & 8 mol% Zn doped HA. Moreover, 0.5 mg/ml 8 mol% B & 4 mol% Zn doped HA group significantly increased 14-day ALP activity of hADSCs and vessel area of human umbilical vein endothelial cells (HUVECs). Overall, Co-doping of B (8 mol%) and Zn (4 mol%) to HA provided both proliferative and osteogenic effects on hADSCs and angiogenic effect on HUVECs. Our findings suggest that B and Zn co-doped HA holds promise for bone tissue engineering applications.
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    Comparative Evaluation of Physical and Chemical Beneficiation Routes for Rare Earth Element Recovery from Coal Bottom Ash: A Case Study from Soma Power Plant, Türkiye
    (Turkish Energy, Nuclear and Mineral Research Agency (TENMAK), Ankara, Türkiye, 2026-01-14) ULUCAN Tülin; GÜVEN, Gülşah; DİNÇ, N. İlkyaz; PURAL, Y. Enes; YÜCE, A. Ekrem; SOYDAŞ SÖZER, Belma; BURAT, Fırat
    The recovery of rare earth elements (REEs) from coal combustion by-products has attracted increasing attention due to their strategic importance and supply constraints. This study evaluates the recovery potential of REEs from bottom ash (BA) produced by the Soma Thermal Power Plant through an integrated physical–chemical beneficiation route. Characterization indicated that REEs are mainly hosted in aluminosilicate glass and mullite phases, showing limited liberation. Physical separation methods, including jigging, shaking table, centrifugal (MGS and Knelson), and magnetic separation, achieved only minor enrichment because of the low density and encapsulation of REE-bearing phases. To overcome these limitations, sequential alkaline and acid leaching were employed. Alkaline pretreatment using 5 mol/L NaOH at 90 °C for 4 h partially decomposed the matrix and improved REE accessibility. Subsequent HCl leaching (5 mol/L, 90 °C, 3 h) resulted in the highest ΣREE recovery (>80%) for the −0.106 mm fraction, while 4 mol/L HCl and −0.3 mm conditions provided a more selective and stable extraction. The combined alkaline–acid leaching process demonstrated a synergistic enhancement in REE mobilization. Overall, sequential chemical leaching offers an effective and scalable approach for REE recovery from coal combustion residues, supporting resource efficiency and waste valorization.