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  • Küçük Resim
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    Azole Compounds as Corrosion Inhibitors: Part I
    (Springer, 2014) Ergün, Ümit; Emregül, Kaan Cebesoy
    The inhibitory effect of 3-amino-1,2,4 triazole (I), 2-aminothiazole (II), and 3-amino-5-mercapto-1,2,4 triazole (III) on the corrosion of steel in 2 M HCl solution has been studied using chemical technique and electrochemical techniques. The inhibition efficiencies (eta) obtained from all the methods employed are in good agreement. Results reveal compound (III) to be the most efficient inhibitor with an inhibition efficiency of 91%. The inhibition efficiency increases with increasing concentration in all three compounds. Studies clearly indicate that these compounds act as a mixed type inhibitor without altering the cathodic reaction. The inhibitors are adsorbed on the surface according to the Langmuir adsorption isotherm. Quantum chemical parameters such as highest occupied molecular orbital energy (E (HOMO)), lowest unoccupied molecular orbital energy (E (LUMO)), energy gap (Delta E), and dipole moment (mu) have been calculated for 3-amino-1,2,4 triazole (I), 2-aminothiazole (II), and 3-amino-5-mercapto-1,2,4 triazole (III) using semi-empirical PM3 and 6-311G(d,p) DFT methods.
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    Crystal Structure and Thermal Decomposition of Square Planar Ni (II) Complexes with ONS Type Ligands (vol 40, pg 788, 2010)
    (Springer/Plenum Publishers, 2011) Durmuş, Sefa; Arıcı, Cengiz; Şahin, Ertan; Ergün, Ümit; Atakol, Orhan
    …
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    Monitoring of Lead and Some Heavy Metals in Wheat Flour of Corum Province, Turkey: An Air Quality Comparison
    (2023) Ölmez, Esra; Gökmeşe, Ebru; Ergün, Ümit; Gökmeşe, Faruk
    Food security is a priority issue for sustainable global development. Metal uptake by plants could have a significant impact on crop quality in areas of rapid industrialization with high fallout of airborne particles. In this study, concentrations of some heavy metals (copper, Cu; zinc, Zn; and lead, Pb) in flour samples supplied in Çorum, defined as one of the “New Industry Focus”, were investigated using inductively coupled plasma-optical emission spectrometry (ICP-OES) to determine the heavy metal contamination. The re- sults showed that the concentration of Pb in all samples examined exceeded the maximum permissible limit. To monitor the increase in Pb concentration and its relationship with air pollution, a two-year laboratory experiment was conducted. It was found that the increase in Pb concentration of about 47% and 77% for two flour samples was consistent with the increase in annual average particulate matter with diameter 10 micrometers PM10 concen- trations (55% and 82%) obtained from two stations.