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    Comparison of ZnO doped different phases TiO2 nanoparticles in terms of toxicity using zebrafish (Danio rerio)
    (Pergamon-Elsevier Science Ltd, 2023) Sezer, Selda; Yucel, Aysegul; Turhan, Duygu Ozhan; Emre, Fatma Bilge; Sarikaya, Musa
    Titanium dioxide is used in many commercial and industrial areas such as paint, paper, cosmetics, textiles, and surface coating. The reasons for its use in such a wide area are its anti-corrosion and high stability. Although TiO2 is considered to be a low-toxicity material, research has been further expanded following the recognition of the possible carcinogenic effects of TiO2 in humans by the International Agency for Research on Cancer (IARC). The aim of this study is to compare the toxicity of TiO2 used in many fields in different phases. In the study anatase TiO2 synthesized by hydrothermal method and dual phase TiO2 (anatase and rutile phase) structures obtained by thermal conditioning were used and compared with commercially available TiO2. ZnO which has similar uses like TiO2 was also used and compared with 1% doped TiO2 in different phases in terms of toxicity. Zebrafish (Danio rerio, D. rerio), a freshwater fish, which is widely used in toxicity assessments was preferred in this study due to its small size, fast reproduction rate, low cost, physiological and molecular similarity with humans, and genetic predisposition. Experimental investigations showed that the highest death occurred in the low concen-trations of (10 ppm) ZnO doped rutile phase. 39% of the embryos died in the ZnO nanoparticle solutions pre-pared at low concentrations. The highest mortality at medium (100 ppm) and high (1000 ppm) concentrations were observed in the ZnO-doped rutile phase after 96 h. Similarly, the highest malformation was detected in the ZnO-doped rutile phase during the same period.
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    Extraction of lithium from boron ore wastes and precipitation as lithium carbonate
    (Taylor & Francis Ltd, 2025) Yucel, Aysegul; Sarikaya, Musa; Yilmaz, Hatice caglar; Depci, Tolga
    This study aims to extract lithium from boron ore waste and obtain it by precipitation in carbonate form. Therefore, three different heat treatments and water leaching were applied after each heat treatment. The lithium-rich solution was preferred as a stock solution. The lithium concentration efficiency in this stock solution was determined to be 97.16%. Solutions prepared at specific sodium ion concentrations were dropped into this solution. Thus, lithium carbonate was obtained. The obtained lithium carbonate can be a valuable resource for meeting the increasing demand for lithium in various industries. These findings are estimated to contribute to the sustainable management of lithium resources and may be promising for future research in lithium recovery and use. Cette & eacute;tude vise & agrave; extraire le lithium & agrave; partir des d & eacute;chets de minerai de bore et & agrave; l'obtenir par pr & eacute;cipitation sous forme de carbonate. Par cons & eacute;quent, on a appliqu & eacute; trois traitements thermiques diff & eacute;rents et une lixiviation aqueuse apr & egrave;s chaque traitement thermique. On a pr & eacute;f & eacute;r & eacute; la solution riche en lithium comme solution m & egrave;re. On a d & eacute;termin & eacute; que l'efficacit & eacute; de concentration du lithium dans cette solution m & egrave;re & eacute;tait de 97.16%. On a vers & eacute; dans cette solution des solutions pr & eacute;par & eacute;es & agrave; des concentrations sp & eacute;cifiques d'ions sodium. Ainsi, on a obtenu du carbonate de lithium. Le carbonate de lithium obtenu peut constituer une ressource valable pour satisfaire & agrave; la demande croissante en lithium dans diverses industries. On estime que ces r & eacute;sultats contribuent & agrave; la gestion durable des ressources en lithium et pourraient & ecirc;tre prometteurs pour les recherches futures sur la r & eacute;cup & eacute;ration et l'utilisation du lithium.