Mustafa Kaya

The Effect of Microwave Irradiation on a Co-B-based Catalyst for Hydrogen Generation by Hydrolysis of NaBH4 Solution

A Co-B-based catalyst was prepared under microwave irradiation for hydrogen generation by hydrolysis of NaBH4 solution. The activity of Co-B catalyst for hydrogen generation was studied in comparison with another Co-B catalyst prepared by the known methods. The results show that Co-B catalyst reduced prepared under microwave irradiation was quick and was completed in only 17 min, while the Co-B catalyst produced in a known method was slow and was completed in 27 min. The hydrogen generation from the hydrolys of NaBH4 with Co-B catalyst was investigated depending on NaBH4 and NaOH concentrations in solution, temperature, microwave applying time, and microwave applying power. Hydrolysis kinetics of NaBH4 were investigated at a temperature range of 30–50°C and zero-order kinetics were applied to the obtained data.

Synthesis and carbonic anhydrase inhibitory properties of tetrazole- and oxadiazole substituted 1,4-dihydropyrimidinone compounds

Abstract A new series of tetrazole-, oxadiazole- and cyanosubstituted 1,4-dihydropyrimidinone compounds were synthesized, and their inhibitory effects on the activity of purified human carbonic anhydrase (hCA) I were evaluated. 4-Cyanophenyl-1,4-dihydropyrimidinone compounds were prepared with 1,3-diketone, cyanobenzaldehyde and urea. The compounds were reacted with sodium azide and then with anhydride to get the final products. The results showed that all the synthesized compounds inhibited the CA isoenzyme activity. The compound 4-(1,7,7-trimethyl-2,5-dioxo-1,2,3,4,5,6,7,8-octahydroquinazoline-4-yl)benzonitrile 6c (IC50 = 0.0547 mM) has the most inhibitory effect.

Effects of different temperatures and additives on the metastable zone width precipitation kinetics of NaBO2

In this study, the sodium metaborate, which is applicable in various industrial areas, and its metastable zone width that is very important for its production by crystallization, and its nucleation are investigated to obtain the necessary thermodynamic parameters. The polythermal and isothermal method has been used for the measurement of metastable zone width. Metastable zone width of NaBO2 has found at 9°C at average and cooling rate do not have any effect on it. In addition, the effect of sodium metaborate on the hydrogen storage capacity of sodium borohyride solutions that is known as one of the best hydrogen sources today is investigated at the various concentrations of sodium borohyride in the medium. Results have shown that three different areas emerged as the percentage of NaBH4 in the solution increased.

Preparation and TG/DTG, FT-IR, SEM, BET Surface Area, Iodine Number and Methylene Blue Number Analysis of Activated Carbon from Pistachio Shells by Chemical Activation

Abstract In this study, low cost activated carbon was prepared from the pistachio shell by chemical activation with zinc chloride (ZnCl2). The prepared activated carbon was characterized by thermogravimetry (TG) and differential thermal gravimetry (DTG), infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and Brunauer, Emmett and Teller (BET) surface area analyses. Results showed that the activation temperature and impregnation ratio have significant effect on the iodine number of the prepared activated carbon. The optimum conditions for preparing the activated carbon having the highest surface area were found to be an activation temperature of 700 °C, soaking time of 24 h and ZnCl2/ pistachio shell ratio of 50 %. The results showed that the BET surface area, total pore volume, iodine number and methylene blue (MB) number of activated carbon prepared under the optimum conditions were 1108 m2/g, 0.39 cm3/g, 1051 mg/g, 98.48 mg/g, respectively.

Preparation and Characterization of Small Pore Carbon Molecular Sieves by Chemical Vapor Deposition of Pistachio Shells

ABSTRACT Low-cost pistachio shells were used for the production of small pore carbon molecular sieves by the benzene deposition method. The prepared materials were characterized by the Brunauer–Emmett–Teller surface area and scanning electron microscopy. The deposition temperature and the deposition time parameters, which affect the formation of carbon molecular sieves, were examined. The effect of deposition temperature was examined in the range of 700–900°C, while deposition time was examined between 30 and 60 min. The optimum surface area of the carbon molecular sieve prepared by benzene deposition was 895 m2/g at 800°C. The average pore diameter of the carbon molecular sieve was 0.27 nm, principally denoted ultramicropore characteristics. The obtained values of the pore size distributions of the prepared carbon molecular sieves were in the range of 0.26–0.29 nm.