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Scopus İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12514/3596

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Browsing Scopus İndeksli Yayınlar Koleksiyonu by Department "MAÜ, Enstitüler, Lisansüstü Eğitim Enstitüsü"

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    Article
    Adsorption of nickel(II) ions from aqueous solutions using Malatya clay: Equilibrium, kinetic, and thermodynamic studies
    (Environmental Progress & Sustainable Energy, 2023) Baran, Ayşe; Dal, Mehmet Can; Onursal, Nilgün; Altunkaynak, Yalçın
    This paper evaluates Malatya clay (MC) for the removal of Ni(II) ions from aqueous solutions. For adsorption efficiency, the impacts of several factors, such as pH, starting metal ion concentration, and contact duration, were examined. The optimal initial Ni(II) ion concentration was determined to be 5 mg/L, the adsorption contact duration was 360 min, and the solution's pH was 6.27. Using scanning electron microscopy, energy dispersive spectroscopy, and Fourier transform infrared spectroscopy, the surface characteristics of Malatya clay were examined. The isotherm data fit the Langmuir isotherm model, indicating chemical adsorption and likely irreversibility of the process, according to the results. At 298, 308, and 318 K, the adsorption capacities of Ni(II) were determined to be 10.267, 11.834, and 12.285 mg/g, respectively. Adsorption kinetic data revealed that the adsorption of Ni(II) metal ions followed the pseudosecond-order kinetic model. According to thermodynamic studies, Ni(II) ion adsorption on the MC is spontaneous and endothermic. MC has proven to be an effective and alternative material for the removal of Ni(II) ions from aqueous media due to its excellent removal ability, availability, and low cost, as well as its features such as being able to be used without any chemical treatment and being environmentally friendly.
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    Article
    Green synthesis and evaluation of antipathogenic, antioxidant, and anticholinesterase activities of gold nanoparticles (Au NPs) from Allium cepa L. peel aqueous extract
    (SpringerLink, 2023) Baran, Ayşe; Polat İpek, Mehmet Fırat Baran, Ayşe Baran, Abdulkerim Hatipoğlu, Cumali Keskin, Mahmut Yildiztekin, Selçuk Küçükaydin, Hatice Becerekli, Kadri Kurt, Aziz Eftekhari, Irada Huseynova, Rovshan Khalilov, William C. Cho
    Gold nanoparticles (Au NPs) have potentially therapeutic properties as they are synthesized via biomolecules as reducing and stabilizing agent(s). The aim of this study is to develop an easy and eco-friendly method for the synthesis of Au NPs using extracts from the Allium cepa (AC) red peel (skin) extract and investigate the antibacterial and antioxidant activity and also inhibitory efects on acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) enzymes. UV–Vis peak at~564 nm confrmed the Au NPs absorbance. TEM images revealed the formation of Au NPs with mostly spherical shapes and sizes between 6.08 and 54.20 nm. FTIR analysis confrmed the important biological compounds responsible for the reduction of gold. The strong absorption property of Au NPs was studied by EDX. The produced Au NPs demonstrated signifcant antibacterial and antifungal activity against the bacterial and fungal strains tested, as well as efcient inhibitory activity against both AChE and BChE enzymes. The highest antimicrobial activities were found against Staphylococcus aureus (0.06° mg/ ml) and Candida albicans (0.06° mg/ml). The antioxidant test fndings revealed that AC-Au NPs had lesser activity when compared to normal antioxidants. The Au NPs showed excellent inhibitory efcacy against AChE and BChE. The proposed green technique could encourage the innocuous generation of Au NPs, implying therapeutic possibilities.