Browsing by Author "Ozturk, Omer Faruk"

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Catalytic Performance of Boron-Containing Magnetic Metal Nanoparticles in Methylene Blue Degradation Reaction and Mixture With Other Pollutants
(Elsevier, 2021) Meydan, Engin; Demirci, Sahin; Aktas, Nahit; Sahiner, Nurettin; Ozturk, Omer Faruk
The catalytic effects of metal nanoparticles (MNPs) synthesized in sodium bis(2-ethylhexyl) sulfosuccinate (AOT) microemulsion system by using M(II) salts (M = Fe, Co, Ni) and NaBH4 reducing agent on methylene blue (MB) degradation reaction were investigated. It was determined that Co-MNPs gave the best catalytic activity among them. Influence of the reaction parameters e.g., reaction time, temperature, the size of catalyst and the MNP types on the catalytic performance were studied. It was found that 37 +/- 6 nm Co-MNPs revealed the best catalytic activity in all studies. The best activation parameters were calculated as 13.6 +/- 1.1 kJ mol(-1) and Delta H = 10.7 +/- 1.0 kJ mol(-1) and Delta S = -87.9 +/- 5.4 J mol(-1) K-1. The activity % of Co-MNPs was calculated as 85.4 after 30 days on the shelf life study. The reusability studies were carried out and the activity of Co-MNPs at the 5th reuse was calculated as 70 +/- 5%. Finally, the catalytic activity of Co-MNPs was investigated inside equal volumes of single and multiple solution mixtures containing MB, 4-Nitrophenol (4-NP) and Eosin Y (EY). In the examinations, it was observed that the nanocatalyst was effective as a reducing agent in all equal amount solutions (MB/4-NP, MB/EY, 4-NP/EY, and MB/4-NP/EY). And also, TOF (mole of MB/4-NP/EY) (mol catalyst.min)(-1) values of catalytic activities were also calculated.
Nh3 Gas Sensing Applications of Metal Organic Frameworks
(Elsevier, 2015) Sel, Kivanc; Demirci, Sahin; Ozturk, Omer Faruk; Aktas, Nahit; Sahiner, Nurettin
Various MOFs as TMA-M derived from Ba(II), Cd(II), Pb(II), and Zn(II) as metal ions (M) and trimesic acid (TMA, benzene-1,3,5-tricarboxylic acid) as organic linker were prepared for the determination of their susceptibility against ammonia (NH3). FT-IR spectroscopy, thermogravimetric analysis, SEM images, BET surface area and porosity measurements were done. Furthermore, the room temperature conductivity of the synthesized TMA-M MOFs were investigated against room temperature NH3 vapor. The room temperature conductivities were determined 8.3E10(-11), 7.6E10(-11) and 1.7E10(-10) S cm(-1) for TMA-Zn, TMA-Cd and TMA-Pb, respectively. Among the TMA-M MOFs, it was observed that TMA-Zn MOF showed relatively higher response to NH3 vapor, where it's conductivity was increased about 50 times in comparison to the conductivity measurement of TMA-Zn MOF in the absence of NH3. Furthermore, a more detailed conductivity analysis of this response was investigated for TMA-Zn MOF as a function of various NH3 exposure times at room temperature. (C) 2015 Elsevier B.V. All rights reserved.