Browsing by Author "Yönten, V."

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Antimicrobial Properties of Multimetallic of Silver Compounds Immobilized on Active Carbon and Nano Carbon Tubes
(Elsevier B.V., 2021) Kazici, H.Ç.; Yönten, V.; Kivanç, M.R.; Ertas, M.; Salman, F.; Yayla, M.
In this paper, some bi- and tri-metallic silver compounds (Ag50Ni50/CNT, Ag90Ni10/CNT, Ag70Ni30/CNT, Pd10Co10Ag80/AC, Pd20Co30Ag50/AC, Pd30Co30Ag40/AC, (AC; active carbon) (CNT; carbon nanotube)) were synthesized with the polyol method. Antibacterial activities against Staphylococcus aureus ATCC 29213, Enterococcus faecalis ATCC 29212, Escherichia coli ATCC 25952, Pseudomonas aeruginosa ATCC 27853 and Bacillus cereus ATCC 29213, and antifungal activity against Candida albicans ATCC 90028 were investigated. The standard protocols were evaluated in the experimental process. The antibacterial activity assay results were correlated with the morphological characterization of the material (scanning electron microscope energy dispersive X-ray spectroscopy). It was determined that all nanomaterials (NMs) had effective antifungal activity against C. Albican fungi, but Ag70Ni30/CNT had better antifungal effects than the other NMs. Only Ag70Ni30/CNT had antibacterial activity against B. cereus and P. aeruginosa bacteria pathogens. Therefore, the relevant NMs were introduced to the literature with this feature of antifungal and antibacterial activities. © 2021
The Utilization of a Statistical Program for Chemical Oxygen Demand Reduction and Diclofenac Sodium Removal From Aqueous Solutions Via Agaricus Campestris/Amberlite Styrene Divinylbenzene Biocomposite
(Springer Science and Business Media Deutschland GmbH, 2022) Özgüven, A.; Yönten, V.; Kıvanç, M.R.
In our study, medium conditions were optimized for percent chemical oxygen demand (COD) reduction and drug removal from diclofenac sodium (DFS) solutions. Response surface methodology/central composite design was used for optimization. A. Campestris/Amberlite Styrene–divinylbenzene (XAD-4) biocomposite material was used as adsorbent. Four independent parameters (pH, initial concentration, interaction time and adsorbent amount) were chosen to optimize both % COD reduction and DFS removal. As a result of experiments, maximum 77% COD reduction and maximum 98% DFS removal were obtained at 4 pH, 225 mg/L initial concentration, 36 min and 0.69 adsorbent amount. Scanning electron microscope and Fourier transform infrared spectroscopy devices were used for characterization of adsorbent material. To identify the isotherm for the adsorption mechanism, the Langmuir, Freundlich, Temkin and Harkins–Jura isotherm equations were examined. The Freundlich isotherm had 96.2% regression coefficient (R2) and was linear, so had better fit compared to the other equations and the adsorption mechanism abided by the Freundlich isotherm. The results show that statistical optimization design was successfully applied to experiments and A. Campestris/Amberlite XAD-4 is an appropriate biocomposite adsorbent with specific affinity for % COD reduction and removal of DFS from aqueous solutions under optimal conditions. © 2021, King Fahd University of Petroleum & Minerals.