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    Öğe
    Çanakkale ili kıyı sularında bazı kirlilik parametrelerinin ve mikrobiyal biyofilm oluşumunun incelenmesi
    (Çanakkale Onsekiz Mart Üniversitesi, 2020) Onat, Buket; Doğru, Nurcihan Hacıoğlu
    Çanakkale Kıyı şeridi deniz suyu rekreasyon, balıkçılık vb. pek çok faaliyet için yoğun kullanıma açık bir alandır. Bu durum beraberinde deniz suyunda yoğun antrapojenik kirlilik baskısını da getirmektedir. Bu çalışmada, Çanakkale kıyı şeridinde belirlenen 4 farklı istasyondan alınan su numunelerinin bazı fizikokimyasal ve mikrobiyolojik parametreleri irdelenmiş ve beraberinde izole edilen farklı bakteri gruplarında antibiyotik ve ağır metal dirençliliği, enzim ve biyofilm aktiviteleri ile bakteriyal karakterizasyonlarının yapılmasına çalışılmıştır. Elde edilen sonuçlar genel sanitasyon değerleri bakımından istasyonların kabul edilebilir sınır değerler içerisinde olduğunu bununla birlikte izole edilen bakterilerin yüksek antibiyotik ve ağır metal dirençliliği gösterdiğini ayrıca önemli virülans faktörler olan enzim aktivitesi ve biyofilm oluşturma kapasitelerinin yüksek olduğunu ortaya koymuştur. Bu çalışmanın bölgede deniz suyu ve deniz ürünlerinde halk sağlığı yönünden mikrobiyal kalitenin irdelenmesi için yapılacak daha kapsamlı çalışmalara da öncülük etmesi beklenmektedir.
  • Küçük Resim
    Öğe
    Optimized size sorting of MXene particles via centrifugal sedimentation: a practical approach using an empirical model and image processing technique
    (Taylor & Francis Inc, 2025) Onat, Buket; Haspulat Taymaz, Bircan; Eskizeybek, Volkan; Kamış, Handan
    Controlling the physical, mechanical, and electrochemical properties of MXene-based materials is crucial for their effectiveness in macroscale applications and is closely tied to the particle size distribution of MXene. This study aimed to accomplish dimensional control and sorting of MXene colloids with different particle sizes using centrifugal sedimentation based on an empirical model. Centrifuge time and rotating speed were identified as key parameters and optimized using a mathematical formula generated from the model, considering particle forces in the solution. A novel image processing technique aimed at ease of use was devised to evaluate the separation process, assuring the audience of its usability. The separation efficiencies were measured individually at rotating speeds ranging from 2900 to 6000 rpm. The optimal experimental settings differed between the supernatant and sediment fractions. The maximum separation efficiency was reached at 86% for the supernatant at 3500 rpm for 49 min and 43% for the sediment at 4200 rpm for 34 min, suggesting that supernatant-based separation is more efficient than sediment-based techniques. This study offers a valuable guideline for separating the sizes of 2D materials. Image processing offers scalable particle size measurement, which improves material property control for a variety of applications.
  • Küçük Resim
    Öğe
    Synthesis of high porous carbon from grape marc-vinasse mixture: investigation on tetracycline and ciprofloxacin removal performance and adsorption mechanisms
    (Springer Heidelberg, 2024) Onat, Buket; Türk, Feride N.; Arslanoğlu, Hasan
    In this study, adsorption, a promising technique due to its simplicity and high efficiency, was used to remove tetracycline and ciprofloxacin from water. One-step activated carbon production from lignocellulosic waste uses an environmentally friendly, effective, economical, and sustainable adsorbent. The study aimed to remove TC and CP from an aqueous solution. The effect of parameters such as pH (3-11), biosorbent dose (0.25-5 g/L), initial antibiotic concentration (10-150 mg/L), and contact time (5-240 min) on adsorption was investigated. It was observed that the adsorption process was relatively fast, and equilibrium was reached within 120 and 90 min for tetracycline and ciprofloxacin, respectively. Furthermore, it showed the best correlation with the Langmuir isotherm model. The theoretical capacities of crude activated carbon waste to adsorb tetracycline and ciprofloxacin were determined as 29.16 and 46.37 mg/g, respectively. The experimental results obtained in this study indicate that this agricultural waste can be used as an environmentally friendly and cost-effective adsorbent to remove some classes of antibiotics from aqueous solutions, thus contributing to the solution of the problem of the uncontrolled presence of these drugs in wastewater.