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Articles by Mahsa Jahangiri-rad
Total Records ( 4 ) for Mahsa Jahangiri-rad
  Arsalan Jamshidi and Mahsa Jahangiri-rad
  The antibacterial activities of copper nanoparticles (Cu-NPs) were studied with respect to gram-negative E. coli by measuring the growth curves of bacteria. Bacterial cells were treated with Cu nanoparticles powder and the growth rates were investigated under varying concentrations of Cu nanoparticles and incubation times. E. coli was shown to be substantially inhibited by copper nanoparticles. These results suggest that Cu- NPs could be used as an effective antibacterial material. The analysis of Kruskal-Wallis test of microbiological data showed that the microbiological bacterial death differ between the different NPs concentration (p<0.05). Cu-NPs showed anti bacterial activity against E. coli.
  Mohammad Rafiee and Mahsa Jahangiri-rad
  Multi-walled and single-walled carbon nanotubes were used as adsorbents for the removal of Reactive Blue 19 textile dye from aqueous solutions. The adsorbents were characterised by scanning and transmission electron microscopy. The effects of pH, shaking time and temperature on adsorption capacity were investigated. The maximum adsorption of dye was observed in the acidic pH region using both adsorbents. The contact time to obtain equilibrium isotherms at 298-323 K was fixed at 2 h for both adsorbents. The equilibrium data were analyzed using three widely applied isotherms: Langmuir, Freundlich and Liu isotherm models. The results revealed that Liu isotherm fit the experimental results well. The maximum sorption capacity for adsorption of the dye occurred at 323 K, attaining values of 450 and 550 mg g-1 for MWCNT and SWCNT, respectively. Standard free energy (ΔG°), standard enthalpy (ΔH°) and standard entropy (ΔS°) were calculated by the data obtained from Liu equation at different temperatures. All ΔG° were negative. The Δh° and ΔS° values were positive; indicating that the reactive blue adsorption was spontaneous and endothermic process.
  Ramin Nabizadeh , Mahsa Jahangiri-rad and Mohammad Rafiee
  Batch adsorption experiments were conducted to evaluate the effects of the initial nitrate concentration, ionic strength and contact time on the nitrate removal efficiency by functionalized polyacrylonitrile coated with iron oxide nanoparticles (PAN-Oxime- Fe2O3). All tests were performed in 100 mL solution at constant temperature of 25°C and mixing rate of 150 rpm. The residual nitrate concentration in the solution was determined spectrophotometrically. Statistical analyses were performed on data using SPSS16 software by applying Kruskal-Wallis tests using Excel software. The results showed that the adsorption of nitrate was influenced by counterions. Finally, experimental data were analyzed using adsorption isotherm. The results show that nitrate removal efficiency increases with an increase in the initial nitrate concentration and contact time and decreases in the presence of other ions.
  Mahsa Jahangiri-rad
  The purpose of this study was to investigate the photocatalytic removal of arsenic from aqueous solution using UV/TiO2 process in a batch system. A 120 W UV lamp with irradiation 247 nm wave lenght inside a quartz jacket was submerged in the reactor to provide better irradiation of water samples in the presence of TiO2 nanoparticles. The optimum dosage of TiO2 was obtained equal to 1 g L-1 with variation TiO2 dosage at constant pH and initial concentrations of arsenic. The effect of pH, contact time and initial concentration of arsenic was studied at the constant amount of TiO2 (1 g L-1). The results showed that photocatalytic removal efficiency increased with increasing reaction time and TiO2 dosage. In addition, it was found that removal efficiency of arsenic decreased by increasing initial arsenic concentration and pH. So, the results showed that UV/TiO2 was an effective method in removal of arsenic from aqueous solutions.
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