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Saadat Rastegarzadeh,Nahid Pourreza,Arash Larki 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
A fast and reliable dispersive liquid–liquid microextraction (DLLME) method for the determination of trace levels of silver by flame atomic absorption spectrometry (FAAS) was developed. The method is based on highly-efficient separation and preconcentration of silver by the complex formation of Ag(I) with 2-mercaptobenzimidazole and extracted by DLLME procedure using carbon tetrachloride as extraction and acetone as disperser solvent. After establishment of a cloudy solution, the phase separation is achieved and Ag(I) is determined in the enriched phase by FAAS. The method yields a linear calibration curve in the concentration range of 1–100 ng mL1 of Ag(I), and the limit of detection is 0.41 ng mL1. The proposed method was successfully applied to determine the trace amounts of silver in water, radiology film processing wastewater and ore samples.
N. Pourreza,S. Rastegarzadeh,A. Larki 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Nano-TiO2 modified with 2-mercaptobenzothiazole (MBT) was investigated as a new adsorbent for preconcentration of Cd(II), Cu(II) and Pb(II). The metal ions are adsorbed onto nano-TiO2-MBT, eluted by nitric acid and determined by flame atomic absorption spectrometry. The parameters affecting the adsorption were investigated. Under optimized conditions, the calibration curves were linear in the range of 0.2–25.0, 0.2–20.0, and 3.0–70.0 ng mL 1 for cadmium, copper and lead, respectively. The limits of detection for Cd(II), Cu(II) and Pb(II) were 0.12, 0.15 and 1.38 ng mL 1, respectively. The method was applied to determination of Cd(II), Cu(II) and Pb(II) in water and ore samples. 2013 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V.
N. Pourreza,S. Rastegarzadeh,A. Larki 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.1
Nano-TiO2 was modified with 2-mercaptobenzimidazole via surfactant activation and used as anadsorbent for the removal of Ag(I) under optimum conditions. The adsorbent was characterized usingpowder X-ray diffraction and FT-IR spectroscopy. The equilibrium data were fitted to the Langmuir,Freundlich and Temkin isotherm models. Langmuir isotherm describes the adsorption data better thanFreundlich isotherm and Temkin. Kinetic studies showed that the pseudo second order kinetic model fitsthe adsorption kinetic processes well. Maximum adsorption capacity for Ag(I) was 128.2 mg g-1 of nano-TiO2. The method was successfully applied to the removal of silver from radiology film processingwastewater samples.
Ali Alizadeh,Gohar Rastegarzadeh 한국우주과학회 2024 Journal of Astronomy and Space Sciences Vol.41 No.1
The safety of electronic components used in aerospace systems against cosmic rays is one of the most important requirements in their design and construction (especially satellites). In this work, by calculating the dose caused by proton beams in geostationary Earth orbit (GEO) orbit using the MCNPX Monte Carlo code and the MULLASSIS code, the effect of different structures in the protection of cosmic rays has been evaluated. A multi-layer radiation shield composed of aluminum, water and polyethylene was designed and its performance was compared with shielding made of aluminum alone. The results show that the absorbed dose by the simulated protective layers has increased by 35.3% and 44.1% for two-layer (aluminum, polyethylene) and three-layer (aluminum, water, polyethylene) protection respectively, and it is effective in the protection of electronic components. In addition to that, by replacing the multi-layer shield instead of the conventional aluminum shield, the mass reduction percentage will be 38.88 and 39.69, respectively, for the two-layer and three-layer shield compared to the aluminum shield.