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Articles by Mohammad Rafiee
Total Records ( 3 ) for Mohammad Rafiee
  Mohammad Rafiee and Mahsa Jahangiri- Rad
  There are about 70% people living in cities in the world, however, urbanization in cities is still in progress. Urban development brings us economic benefits but also results in environmental pollutions. Steps taken to environmental sustainability can lead to the preservation of natural resources while welfare, economic and social dimensions are considered. There are lots of ways to reach sustainability, one of which is through abatement of air pollution which in turn would have direct and indirect impacts on environmental, economic and sociopolitical sustainability. This review outlines the issues concerned in air mitigation such as the use of renewable energies, the role of green lands and sustainable transportation as keys for sustainable development.
  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.
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