Rıza Binzet Rıza Binzet FEN FAKÜLTESİ BİYOLOJİ BÖLÜMÜ BOTANİK ANABİLİM DALI
Araştırmacının yayınlarını daha detaylı bir şekilde aramak veya filtrelemek için buraya tıklayabilirsiniz.

Green Synthesis of Reduced Graphene Oxide Decorated with Silver Nanoparticles Using Onosma bracteosa Leaf Extract for Efficient Electrochemical Detection of Hydrogen Peroxide

Turunç, Ersan | Binzet, Rıza

In this study, a simple, cost-effective and eco-friendly method was performed for the production of silver nanoparticle decorated reduced graphene oxide (rGO-Ag) nanocomposite using Onosma bracteosa leaf extract as reducing and stabilizing agent. The structure of the synthesized rGO-Ag nanocomposite was characterized by UV–Vis, XRD, SEM, TEM, EDX, and XPS. The synthesized rGO-Ag nanocomposite was used to fabricate an electrochemical sensor (rGO-Ag@GCE) for the determination of hydrogen peroxide. Electrochemical reduction of hydrogen peroxide was performed using DPV on rGOAg@GCE in 0.1 M PBS. The rGO-Ag@GCE exhibited good response in the linear concentration range of 25 µM to 800 µM, with a LOD of 0.11 µM. Amperometric measurements showed that the prepared sensor did not have a significant response to interfering species. Moreover, analysis of real samples demonstrated the potential of rGO-Ag@GCE as an electrochemical sensor for detecting hydrogen peroxide in commercial milk samples

Enhanced electrochemical sensing of nitrite ions in water samples using hydroxyapatite-zinc oxide nanocomposite modified carbon paste electrode

Turunç, Ersan | Binzet, Rıza

This study reports the green synthesis of a hydroxyapatite‑zinc oxide (HAp-ZnO) nanocomposite using Onosma mersinana leaf extract (OMLE) and its application as a highly sensitive electrochemical sensor for nitrite ion detection. The structural and surface characteristics of the synthesized nanomaterial were confirmed by XRD, which revealed crystalline phases corresponding to both HAp and ZnO; SEM analysis showed uniform morphology; EDX confirmed elemental composition; and XPS identified chemical states of Zn, O, Ca, C, and P, verifying successful ZnO doping. The HAp-ZnO nanocomposite was incorporated into a carbon paste electrode (CPE) to fabricate the CPE@HAp-ZnO100 sensor for the electrochemical detection of nitrite. The electrochemical behavior of nitrite on the CPE@HAp-ZnO100 electrode was investigated using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), chronoamperometry (CA), and differential pulse voltammetry (DPV) techniques. This electrode exhibited a low detection limit (LOD) of 0.12 μM in the 5–1000 μM range, determined by the equation LOD = 3.3σ/S. The electrochemical response was influenced by key parameters including electrode composition (optimal at 10 % modifier), pH (optimal at pH 7.0), and scan rate, which followed diffusion-controlled ki...

Green synthesis of graphene quantum dot-and its electrochemical, antioxidant and antimicrobial activities

Turunç, Ersan | Döğen, Aylin | Binzet, Rıza

The present work reports the synthesis of graphene quantum dots with a green approach. Graphene quantum dots (ssGQDs) were synthesized via Sarcopoterium spinosum (L.) Spach. fruit powder extract. The prepared ssGQDs were characterized by UV-Vis Spectroscopy, X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS) and Malvern Zeta Sizer. The electrochemical activity of ssGQDs was investigated by cyclic voltammetry (CV) and differential puls voltammetry (DPV) methods. The synthesized ssGQDs were used to prepare electrosensor and tested for the electrochemical determination of dopamine. DPV studies showed a low detection limit of 0.107 μM over a wide linear concentration range of 10–800 μM. Antibacterial and antioxidant activities of synthesized ssGQDs were also investigated. The results showed that ssGQDs exhibited different antibacterial activity on Gram (+), Gram (-) bacterial strains and antifungal activity against fungal strains. 1,1-diphenyl-2-picryl-hydrazyl (DPPH) hydrogen peroxide (H2O2) scavenging methods were used to examine the antioxidant activity of ssGQDs and were found to be effective.