Reza Aminzadeh

The degradation of methyl tert-butyl ether (MTBE) was investigated in the aqueous solution of coated ZnO onto magnetite nanoparticale based on an advanced photocatalytic oxidation process. The photocatalysts were synthesized by coating of ZnO onto magnetite using precipitation method. The sample was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and vibration sample magnetometer (VSM). Besides, specific surface area was also determined by BET method. The four effective factors including pH of the reaction mixture, Fe3O4/ZnO magnetic nanoparticles concentration, initial MTBE concentration and molar ratio of [H2O2]/ [MTBE] were optimized using response surface modeling (RSM). Using the four-factor-three-level Box–Behnken design, 29 runs were designed considering the effective ranges of the influential factors. The optimized values for the operational parameters under the respective constraints were obtained at PH of 7.2, Fe3O4/ZnO concentration of 1.78 g...

CA/TiO2 hybrid membranes were prepared via phase inversion by dispersing TiO2 nanopaticles in the CA casting solutions. TiO2 nanoparticles, which were synthesized by the sonochemical method, were added into the casting solution in different concentrations. The influence of TiO2 on the morphology and thermal stability of the CA/TiO2 membranes were investigated through the methods of scanning electron microscopy (SEM) and thermal gravimetric analysis (TGA). Permeation performance of the prepared membranes was evaluated in terms of pure water flux (PWF) and water content (WC). SEM results show that addition of TiO2 nanoparticles cause that the hybrid membrane becomes more porous because of increasing in the mean pore size. TGA results show that the interaction exists between the TiO2 nanopaticles and CA. Also the thermal stability of the hybrid membrane was improved by the addition of TiO2 nanopaticles. The membranes PWF shows that addition of TiO2 nanoparticles leads to the water permeation increase.

In this study, the effect of different osmotic solution concentrations (20–60% w/w of sucrose with 10% w/w NaCl salt), fruit to solution ratios (1:9–1:3), immersion times (0.5–4 h), and temperatures (15–55°C) on the mass transfer kinetics during osmotic dehydration of melons (Curcumis melo L.) in ternary solution namely sucrose–salt–water followed by air-drying were investigated. The effective diffusion coefficients for sucrose and water during osmotic dehydration were determined, assuming osmotic dehydration to be governed by Fickian diffusion. The estimated parameters allowed optimizing the system to reduce total processing time. The optimum treatments were with 50% sucrose and 10% NaCl salt concentration, fruit to solution ratio of 1:4 for 1 h at 45°C. Samples non-treated and pre-treated in optimized conditions were dried in a hot-air dryer at 60°C until equilibrium was achieved after 2.5 h. Pre-treatment reduced the air-drying period in up to 6.8 h.

CA/TiO2 hybrid membranes were prepared via phase inversion by dispersing TiO2 nanopaticles in the CA casting solutions. TiO2 nanoparticles, which were synthesized by the sonochemical method, were added into the casting solution in different concentrations. The influence of TiO2 on the morphology and thermal stability of the CA/TiO2 membranes were investigated through the methods of scanning electron microscopy (SEM) and thermal gravimetric analysis (TGA). Permeation performance of the prepared membranes was evaluated in terms of pure water flux (PWF) and water content (WC). SEM results show that addition of TiO2 nanoparticles cause that the hybrid membrane becomes more porous because of increasing in the mean pore size. TGA results show that the interaction exists between the TiO2 nanopaticles and CA. Also the thermal stability of the hybrid membrane was improved by the addition of TiO2 nanopaticles. The membranes PWF shows that addition of TiO2 nanoparticles leads to the water permeation increase.