Browsing by Author "Duran, Ali"

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Assessment of Gluten-Free Food Sourced Heavy Metal Accumulation for Celiac People
(SİVAS CUMHURİYET ÜNİVERSİTESİ, 2019) Soylak, Mustafa; Duran, Ali; Yılmaz, Erkan; 0000-0002-6260-2424; AGÜ, Fen Bilimleri Enstitüsü, Malzeme Bilimi ve Makine Mühendisliği Ana Bilim Dalı; Duran, Ali
This paper shows an evaluation to the study of some heavy metals in certain gluten-free foods for celiac people marketed in Kayseri, Turkey. The concentration values of Cu, Mn, Co, Pb, Cr, Zn, Ni, Cd and Fe in eleven different gluten-free food samples are reported. The determinations were carried out by flame atomic absorption spectrometry after wet digestion method. The average metal concentrations of all the analyzed samples were determined in the range of 0.45-5.12, 1.84-12.2, 1.29-22.5, 0.60-3.01, 0.08-0.18, and 4.61-79.6 mg kg-1 for Cu, Mn, Zn, Ni, Cd and Fe, respectively. The accuracy of the method was confirmed by the analysis of a standard reference material (SRM 1570a Spinach Leaves). Metal pollution index was also calculated to examine the overall heavy metal levels in all analyzed samples. The concentrations of the analyzed metals are equivalent to 7.55-35.3% compared to the daily intake offered by international decision authorities. For this reason, the nutritional quality index for gluten-free food products with respect to all the metals seems to be relatively low.
Filtration and Optimization for the Recovery of Powder Soap Used in Wire Drawing Process
(Afyon Kocatepe Üniversitesi, 2024) Eren, Orhan; Duran, Ali; Yılmaz, Erkan; 0000-0002-6260-2424; 0000-0001-8962-3199; AGÜ, Mühendislik Fakültesi, Malzeme Bilimi ve Nanoteknoloji Mühendisliği Bölümü; Duran, Ali; Yılmaz, Erkan
Today, the amount of production and production-related waste has increased in order to meet the rapidly increasing consumption. Recycling processes have become inevitable in order to dispose of the resulting wastes without harming the environment and human health and to bring them into the economy. In this study, the recovery of sodium-based waste powder soap used in wire drawing processes was carried out. The ion solution method, which is a physical separation method, was used. With this method, the recovery rate was found to be 98%. Thermal and chemical analyzes were carried out with thermogravimetric and differential thermal analyzes device (TGA/DTA), X-ray fluorescence spectrometer device (XRF) and Fourier transform infrared spectroscopy (FTIR) to determine if there is any change in the structure of the material obtained after recovery.
Flexible electrodes composed of flower-like MoS2 and MXene for supercapacitor applications
(Elsevier Ltd, 2024) Hayat, Hilal Pecenek; Dokan, Fatma Kılıç; Onses, M. Serdar; Yılmaz, Erkan; Duran, Ali; Sahmetlioglu, Ertugrul; 0000-0002-6260-2424; AGÜ, Mühendislik Fakültesi, Malzeme Bilimi ve Nanoteknoloji Mühendisliği Bölümü; Duran, Ali
Flexible supercapacitors with high charge storage ability are needed for emerging applications in wearable electronics. Here, we introduce a novel flexible supercapacitor electrode by incorporating flower-like MoS2 into MXene via a hydrothermal technique. We mostly focused on the structural design for electrode configuration to enhance the charge storage mechanism. Three different electrodes composed of MoS2, MXene, and MoS2@MXene were fabricated via a versatile drop-casting and drying method. There are unique advantages of incorporating MoS2 with MXene such as the fast electron transfer, hydrophilicity of the interface, and structural stability. The MoS2@MXene // MXene flexible asymmetric supercapacitor device offered a high energy density of 1.21 W h /kg and a power density of 54.45 W /kg. Moreover, the asymmetric device exhibits nearly identical electrochemical behavior following 100 bending cycles at different angles. The high electrochemical activity of MoS2 and MXene and good interaction are ascribed to the superior electrochemical performance of the composite material. Furthermore, this research could guide the development of flexible, high-performance, and low-cost electrodes which will be useful in wearable electronics.
Flexible electrodes composed of flower-like MoS2 and MXene for supercapacitor applications
(ELSEVIER, 2024) Hayat, Hilal Pecenek; Dokan, Fatma Kılıç; Onses, M. Serdar; Yılmaz, Erkan; Duran, Ali; Sahmetlioglu, Ertugrul; 0000-0002-6260-2424; AGÜ, Mühendislik Fakültesi, Malzeme Bilimi ve Nanoteknoloji Mühendisliği Bölümü; Duran, Ali
Flexible supercapacitors with high charge storage ability are needed for emerging applications in wearable electronics. Here, we introduce a novel flexible supercapacitor electrode by incorporating flower-like MoS2 into MXene via a hydrothermal technique. We mostly focused on the structural design for electrode configuration to enhance the charge storage mechanism. Three different electrodes composed of MoS2, MXene, and MoS2@MXene were fabricated via a versatile drop-casting and drying method. There are unique advantages of incorporating MoS2 with MXene such as the fast electron transfer, hydrophilicity of the interface, and structural stability. The MoS2@MXene // MXene flexible asymmetric supercapacitor device offered a high energy density of 1.21 W h /kg and a power density of 54.45 W /kg. Moreover, the asymmetric device exhibits nearly identical electrochemical behavior following 100 bending cycles at different angles. The high electrochemical activity of MoS2 and MXene and good interaction are ascribed to the superior electrochemical performance of the composite material. Furthermore, this research could guide the development of flexible, high-performance, and low-cost electrodes which will be useful in wearable electronics.
Green Synthesis of C-quantum Dots Modified ZnO Nanophotocatalyst: The Effect of Different Solvents Used in Production of C-quantum Dots Modified ZnO Nanophotocatalyst on Photocatalytic Performance
(SİVAS CUMHURİYET ÜNİVERSİTESİ: Sivas Cumhuriyet University, 2022) Vurucuel, Merve; Duran, Ali; İnci, Abdullah; Yılmaz, Erkan; 0000-0002-6260-2424; AGÜ, Mühendislik Fakültesi, Malzeme Bilimi ve Nanoteknoloji Mühendisliği Bölümü; Duran, Ali
Access the quality and sufficient amount of water is started to being problem with population increasing. One of the way to behalf the solution of this problem is usage waste water treatment in industry and agriculture. Wastewater treatment methods have disadvantages of being costly and producing secondary pollutants, photocatalysis, which is one of the advanced oxidation methods that is more advantageous and effective in removing pollutants, is promising. The newest member of nanomaterial, C-quantum dots (CQDs) has been increasingly get attention on lots of field including photocatalyst. Semiconductors are commonly used in photocatalysis however, they have electron pair recombination problem that results decreasing of efficiency. Doping semiconductors with different nanomaterials is one of the easiest ways to get over the problem. Recently CQDs has been started to used as dopping agent. Solvothermal method is among the easiest and environmentally friendly methods in nanomaterial synthesis. In this study, the effect of dimethylformamide, dimethylsulfoxide, ethylene glycol and water as solvothermal solvent on the photocatalytic efficiency of C-modified ZnO nanoparticles (CQDs@ZnO NPs) was investigated for the first time in the literature. Photocatalytic performance of CQDs@ZnO NPs was investigated on the photocatalytic degradation of methylene blue (MB). Angora mohair has been used as a CQDs source for the first time in the literature. Photocatalytic degradation performances of CQDs@ZnO NPs for MB at 300 min were 82.4%, 87.6% and 99% for ethylene glycol-water mixture, DMSO and DMF, respectively. The results proved that solvent type for solvothermal synthesis procedure has important role for photocatalytic performance of CQDs@ZnO NPs.
Nanoclay- and TiO2 Nanoparticle-Modified Poly( N-vinyl pyrrolidone) Hydrogels: A Multifunctional Material for Application in Photocatalytic Degradation and Adsorption-Based Removal of Organic Contaminants
(ACS Publications, 2022) Duran, Ali; Marouch, Salsabil; Benbellat, Noura; Yılmaz, Erkan; 0000-0001-8962-3199; AGÜ, Mühendislik Fakültesi, Malzeme Bilimi ve Nanoteknoloji Mühendisliği Bölümü; Duran, Ali
In recent times, access to clean water has become increasingly difficult and one of the most important problems for the sustainability of life due to environmental pollution. Based on this thought, in this study, a multifunctional hydrogel nanocomposite (nanoclay@TiO2@PNVP) containing linear poly(N-vinyl pyrrolidone) (PNVP), nanoclay, and TiO2 nanoparticles was synthesized and used as an adsorbent and photocatalyst for the adsorption-based and photocatalytic degradation-based removal of organic and pharmaceutical pollutants such as methylene blue (MB) and sildenafil citrate (SLD). The modification of the hydrogel with TiO2 nanoparticles and nanoclay aimed to increase the adsorption capacity of the PNVP hydrogel as well as to gain photocatalytic properties for the effective removal of organic contaminants. This hybrid material, which can be cleaned in two different ways, can be reused and recycled at least 10 times. Characterization studies were carried out using Fourier transform infrared spectroscopy, scanning electron microscopy, Raman spectroscopy, thermogravimetric analysis, differential thermogravimetry, and viscosimetry techniques. Optimization studies for the adsorption-based removal of organic contaminants were carried out on MB and SLD as model organic compounds. The optimum parameters for MB were found at pH 10 of the sample solution when 50 mg of the nanoclay@TiO2@PNVP hydrogel nanocomposite was used for 420 min of contact time. It was observed that 99% of the MB was photocatalytically degraded within 150 min at pH 10. Our material had multifunctional applicability properties, showing high adsorption and photocatalytic performances over 99% for at least 10 times of use. For the removal of organic and pharmaceutical contaminants from wastewater, the synthesized material can be used in two treatment processes separately or in combination in one step, providing an important advantage for its usability in environmental applications.