Yazar "Kurt, A." seçeneğine göre listele
Listeleniyor 1 - 4 / 4
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Anodic oxidation of cefaclor antibiotic in aqueous solution containing potassium chloride(Global Network Environmental Science & Technology, 2020) Kurt, A.At this study, electrochemical oxidation of cefaclor antibiotic was investigated with new generation Sn/Sb/Ni-Ti anodes. Platinized titanium was used as cathode material. Chemical oxygen demand (COD), total organic carbon (TOC) and cefaclor (CEF) active substance parameters were used to evaluate the process efficiency. Salt (KCI) addition (mg L-1) pH value, current density (mA cm(-2)) and reaction time (minute) were the factors controlling the reactions. Kinetic evaluations were performed during the application of electrochemical oxidation processes to obtain pseudo-first degree kinetics. 750 mg KCl, pH 7 and 50 mA cm(-2) current density were found as the optimum conditions at room temperature (25 degrees C). Thus, % 99 removal efficiencies were found for COD and TOC parameters after 60 min reaction and complete mineralization of CEF was occured in just 30 min at the optimum conditions. Consequently, Sn/Sb/Ni-Ti anodes were found very useful and successful for cefaclor oxidation and mineralization. The advantages of the processes are complete mineralization at shorter reaction time with low current densities and there is no need to pH arrangement.Öğe Experimental Study on the Performance Characteristics of Non-asbestos Brake Pads Using a Novel Friction Testing Machine(Springer, 2021) Oktem, H.; Uygur, I.; Akincioglu, G.; Kurt, A.The friction, wear and mechanical properties of a new non-asbestos brake pad formulation called Premix were investigated. A novel friction-testing machine was utilized to determine tribological behavior. The tribological, physical and mechanical properties of the brake pads were measured and their friction surface morphology was explored via optical and scanning electron microscopy. Results showed that the Premix affected the friction coefficient. Moreover, it decreased the specific wear rate. The small value of friction coefficient is 0.566 at 90 degrees C whereas the small value of specific wear rate is 3.8 x 10(-8) cm(3)/N.m at 180 degrees C. Friction and wear results approximated those of commercial brake pads. It was concluded that the Premix played a crucial role in the tribological, physical and mechanical properties of the brake pads.Öğe Investigation of electrochemical color removal from organized industrial district (OID) wastewater treatment plants using new generation Sn/Sb/Ni-Ti anodes(Global Network Environmental Science & Technology, 2019) Yonar, Taner; Shakir, F.; Kurt, A.In this study, the application of Sn/Sb/Ni-Ti electrodes for the treatment of waste streams were investigated which is promising for ozone production by electrolysis of water because of their stability and high potential for ozone evolution reaction. These series of anodes have a high electrochemical ozone generation potential at ambient conditions (approximately up to 40% current efficiency). But using and testing of these novel anodes for real wastewater are too limited in the literature. Titanium mesh substrate coated with Sn/Sb/Ni-Ti alloy was used as anode immersed in wastewater at room temperature with platinized titanium cathode. These electrodes used for COD and color removal from OID wastewater in Inegol, Bursa, Turkey. Five operational parameters were evaluated for electrochemical COD and color removal processes, such as pH, salt content, applied voltage/current, current efficiency and contact time. Experimental results showed that after 30 min the electrochemical oxidation efficiency of COD and color could reach up to 98% and 99% respectively at pH 8.2 and temperature of 25 degrees C as the optimum conditions. Current density observed as the most effective parameter for COD and color removal efficiencies. The lowest energy consumption was between 10-25 mA cm(-2) of current density with only 0.6 kWh gCOD(-1), while the highest energy consumption was 100 mA cm(-2) of current density with 9.12 kWh kgCOD(-1). The optimum current density value has been found as 50 mA cm(-2) with 4.05 kWh gCOD(-1). These results were also supported with ANOVA test.Öğe Treatability studies of hospital wastewaters with AOPs by Taguchi's experimental design(Global Network Environmental Science & Technology, 2017) Yonar, Taner; Kurt, A.In this study, it was studied various advanced oxidation treatment processes; Fenton, UV/H2O2, UV/O-3/H2O2 for treatability of hospital wastewaters containing antibiotics (cephalosporines). Taguchi's L25 orthogonal array design was applied to design of advanced oxidation processes, for simplification of the analysis and calculations. 95,7%, 90,65%, 91,8% COD and 55,86%, 60,83%, 70,8% TOC removal efficiencies were obtained under the best operation conditions for UV/H2O2, UV/O-3/H2O2 and Fenton processes, respectively. According to the ANOVA results, pH was of great importance in COD removal for Fenton. For the UV/H2O2 processes, H2O2 has significance in COD and TOC removals. As for the O-3/UV/H2O2 processes, O-3/UV reaction time was found as an important parameter effecting the removal rates. Also, cephalosporine antibiotic active compounds (cefradine and cefaclor) were degraded completely within minutes for all of the processes. Taguchi's Method was found useful for the environmental applications and simplifications of advanced oxidation processes for treatment of hospital wastewaters and calculations.
