Browsing by Author "Acay, H."

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Applications of Biodegradable Green Composites
(Springer Nature, 2021) Yildirim, A.; Acay, H.
Materials called biodegradable green composites consisting of matrices and reinforcers made entirely from natural resources are macro-, micro-, or nano-sized materials that can fulfill desired mechanical and thermal properties as well as being light. Producing natural polymers with good mechanical properties and thermal stability has attracted the attention of many researchers. The use of this material through a variety of mixtures and composites has become more and more popular as raw materials are limited and there is more concern about greener material that is environmentally friendly. Therefore, materials made from renewable sources such as biocompatible/biodegradable polymers can dominate the future by replacing the petroleum raw material. However, more efforts are needed to achieve better properties of the renewable polymer blend and composites and also to address the deficiencies of this new material. To do this, a basic understanding of renewable material types, structures, properties, and potential applications as needed. The study covers the application areas of biodegradable green composites. The stated application areas can be literature support for the rapid development of biodegradable composites at the request of researchers, manufacturers, and consumers for environmentally friendly products. © 2021, Springer Nature Singapore Pte Ltd.
Biosynthesis and Characterization of Silver Nanoparticles Using Fig (ficus Carica) Leaves: a Potential Antimicrobial Activity
(Corvinus Univ Budapest, 2019) Acay, H.
Environmentally friendly methods for obtaining nanomaterials see a great interest. In addition to being inexpensive, the easy implementation process and the advantages of synthesis without toxic chemicals are the main reasons of interest. In this study, silver nanoparticles (AgNPs) were successfully synthesized using fig (Ficus carica) leaf extract. The formation and the presence of AgNPs were observed using ultraviolet-visible spectrophotometry (UV-Vis). Peaks with a maximum wavelength of 419 nm are identified in the measurements. Phytochemicals in the extract responsible for functional groups providing reduction and stability were evaluated using Fourier transform infrared spectroscopy (FT-IR) data. The Scanning electron microscopy-Energy Dispersive X-Ray Spectrum (SEM-EDX) analysis showed that the AgNPs were spherical and the elemental composition contained mostly silver. X-ray diffractometer (XRD) results revealed that the peaks 111 degrees, 200 degrees, 220 degrees and 311 degrees belong to the characteristic structure of silver and have a crystal dimension of 17.30 Nm using Debye-Scherrer equation. In thermogravimetric - differential thermal analysis (TGA-DTA) analysis, the degradation temperatures of AgNPs were evaluated. AgNPs showed antimicrobial activity on various microorganisms even at very high concentrations. As a solution to the antimicrobial search, it can be developed in medical industry.
Biosynthesis and Characterization of Silver Nanoparticles Using King Oyster (pleurotus Eryngii) Extract: Effect on Some Microorganisms
(Corvinus Univ Budapest, 2019) Acay, H.; Baran, M. F.
The integration of the principles of green chemistry into nanotechnology has become one of the key issues in nanotechnology research. Metal nanoparticle production, which does not contain toxic chemicals and does not harm the environment, needs to be developed to avoid adverse effects on medical applications. In this study, Pleurotus eryngii (PE) extract was used for preparation of silver nanoparticles (AgNPs). The presence of AgNP was understood that after adding 1 mM silver nitrate (AgNO3) to the fungus extract, the reaction turned from the open yellow to reddish brown. The analysis of samples taken at different times with the UV-Visible Spectrophotometer (UV-Vis) confirms the formation of PE-AgNPs. The Scanning electron microscopy-Energy Dispersive X-Ray Spectrum (SEM-EDX) analysis showed that spherical nanoparticles were formed. X-ray crystallography (XRD), analysis is calculated from Debye-Sherers inequality, in which PE-AgNP synthesized in the study was 18.45 nm in size. It has been demonstrated by using the minimum Inhibitory Concentration (MX) method in which AgNPs have strong antimicrobial activity.
Investigating Antimicrobial Activity of Silver Nanoparticles Produced Through Green Synthesis Using Leaf Extract of Common Grape (Vitis Vinifera)
(Aloki Applied Ecological Research and Forensic inst Ltd, 2019) Acay, H.; Baran, M. F.; Eren, A.
In this study, a direct approach to fabricating silver nanoparticles (AgNPs) via the leaf extract of common grape (Vitis vinifera) has been demonstrated. The produced particles were found with a maximum wavelength of 452.47 nm, spherical shape and the crystal size of 18.53 nm through UV-Visible spectrophotometry, XRD (X-ray diffraction) and SEM (Scanning electron microscopy) characterization methods. Furthermore, the functional groups involved in the reduction were specified with FTIR (Fourier transform infrared spectroscopy), the elemental compounds were identified with EDX (Energy dispersive X-Ray spectroscopy) and the degradation points were determined with TGA-DTA (Thermal gravimetric analysis) methods. AgNPs were found to be effective against hospital pathogens, namely Gram-negative Escherichia coli ATCC 25922, Gram-positive Staphylococcus aureus ATCC 29213 and Candida albicans fungus at the concentrations of 0.314, 0.078 and 0.334 mu g mL(-1), respectively.
Methylene Blue and Malachite Green Dyes Adsorption Onto Russula Delica/Bentonite
(Elsevier Ltd, 2025) Yildirim, A.; Acay, H.
In the current research Russula delica mushroom/bentonite clay (RDBNC) as a low-cost bionanosorbent was investigated for adsorption of methylene blue (MB) and malachite green (MG) dye from contaminated water. The bionanosorbent was characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), Scanning electron microscopy (FESEM), Thermal Gravimetric Analysis (TGA), and Zeta-potential techniques. Adsorption experiments of RDBNC for MB, MG dyes following Freundlich isotherm and pseudo second order kinetic models. To determine their effects on the adsorption efficiency, the adsorption parameters were investigated including dye concentration, contact time, temperature, and dosage of the bionanosorbent. The adsorption process can operate through three primary mechanisms: the π–π interaction, the hydrogen bonding, and electrostatic interactions between the surface of RDBNC and MB, MG dyes. Desorption results revealed that MB and MG dyes were effectively desorbed during the fourth cycle without a notable loss in adsorption capacity. The thermodynamics parameters including ΔH, ΔS, and ΔG, were determined, and the adsorption process was favorable, spontaneous, and exothermic for MB and MG. The results showed that RDBNC, which showed effective inhibition at low concentrations, especially against E. coli, can be used as a low-cost bionanosorbent synthesised for the first time to remove industrial dyes. © 2024 The Authors