Browsing by Author "Celik Kazici, Hilal"

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A Comprehensive Study of Hydrogen Production From Ammonia Borane Via Pdcoag/Ac Nanoparticles and Anodic Current in Alkaline Medium: Experimental Design With Response Surface Methodology
(Higher Education Press, 2020) Celik Kazici, Hilal; Yilmaz, Sakir; Sahan, Tekin; Yildiz, Fikret; Er, Omer Faruk; Kivrak, Hilal
In this paper, the optimization of hydrogen (H-2) production by ammonia borane (NH3BH3) over PdCoAg/AC was investigated using the response surface methodology. Besides, the electro-oxidation of NH3BH3 was determined and optimized using the same method to measure its potential use in the direct ammonium boran fuel cells. Moreover, the ternary alloyed catalyst was synthesized using the chemical reduction method. The synergistic effect between Pd, Co and Ag plays an important role in enhancement of NH3BH3 hydrolysis. In addition, the support effect could also efficiently improve the catalytic performance. Furthermore, the effects of NH3BH3 concentration (0.1-50 mmol/5 mL), catalyst amount (1-30 mg) and temperature (20 degrees C-50 degrees C) on the rate of H-2 production and the effects of temperature (20 degrees C-50 degrees C), NH3BH3 concentration (0.05-1 mol/L) and catalyst amount (0.5-5 mu L) on the electro-oxidation reaction of NH3BH3 were investigated using the central composite design experimental design. The implementation of the response surface methodology resulted in the formulation of four models out of which the quadratic model was adjudged to efficiently appropriate the experimental data. A further statistical analysis of the quadratic model demonstrated the significance of the model with a p-value far less than 0.05 for each model and coefficient of determination (R-2) of 0.85 and 0.95 for H-2 production rate and NH3BH3 electrroxidation peak current, respectively.
Development of an Ultra-Sensitive Method Using Nafion and Multi-Walled Carbon Nanotube Coated Glassy Carbon Electrode for Atenolol Determination
(Pamukkale Univ, 2018) Celik Kazici, Hilal
Atenolol (Scheme 1) is antihypertensive drug that form beta-blocker group, which widely used in the treatment of hypertension In this study, the redox properties of the Tensinor drug used in blood pressure treatment were examined on modified glassy carbon electrode and the electrodes prepared by coating carbon nanotubes on this modified electrode. In order to investigate the effects of nafion coated multi-walled glass nanotube (MWCNT /NGCE) electrode response and nafion coated glassy carbon electrode (NGCE) and electrode responses of only glassy carbon electrode (GCE) surfaces on the support electrolyte, pH and scan rate, the cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods were used. Atenolol (ATN) was observed in the BrittonRobinson (BR) buffer solution (pH 7.0) thereabouts 1.11 V (vsAg / AgCl (3.0 mol L-1 KCl). Voltammetric method reacted linear at a concentration range between 3x10-5 mu M and 9x10-2 mu M under optimum analytical experimental conditions. The results of Tensinor's limit of detection on the Britton-Robinson (BR) (pH= 7) buffer were found to be 7.67 x 10-5 mM and 2.5 x 10-4 mM, respectively. Additionally, in the study, interference effects experiments were performed with auxiliary substances used in the preparation of medicines and no negative effect was observed.
Synthesis and Characterization of Fe3o4-Supported Metal-Organic Framework Mil-101(fe) for a Highly Selective and Sensitive Hydrogen Peroxide Electrochemical Sensor
(Springer Heidelberg, 2020) Salman, Firat; Zengin, Adem; Celik Kazici, Hilal
In this study, an electrochemical sensor for the quantification of hydrogen peroxide (H2O2) based on nafion glassy carbon electrode (NGCE) modified with MIL-101(Fe)@Fe(3)O(4)metal-organic frameworks (MOFs) was developed. Its electrochemical performance and surface analyses were examined with various techniques. The MIL-101(Fe)@Fe3O4/NGCE sensor exhibited a well-defined redox peak towards H(2)O(2)since the frameworks provide high electronic conductivity and easy mass transfer for target molecules. The parameters that affected the performance of the developed sensor were optimized. The proposed sensor showed a low detection limit (0.15 mu M) and relatively good sensitivity (68.8312 mu AmM-1 cm(-2)) according to the differential pulse voltammetry (DPV) method. Furthermore, the chronoamperometry (CA) method exhibited high sensitivity (556.5037 mu AmM-1 cm(-2)) but a relatively low detection limit (1.76 mu M), and the proposed sensor demonstrated excellent repeatability. Furthermore, the sensor was applied for the detection of H(2)O(2)in industrial samples.