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Articles by Arsalan Jamshidi
Total Records ( 2 ) for Arsalan Jamshidi
  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.
  Arsalan Jamshidi , Mohammad Rafiee and Mahsa Jahangiri Rad
  The present study was conducted to evaluate the feasibility of modified nanoclay for reactive blue 29 dye removal from saqueous solution. The nature and morphology of the sorbent were characterized by Fourier Infrared Spectroscopy (FT-IR) and Scanning Electron Microscopy (SEM) analysis. Batch adsorption studies were performed as a function of contact time, adsorbent dosage, temperature and pH. Montmorillonite (MMT) was modified by a facile and one-step procedure with diethylenetriamine (DETA). The equilibrium adsorption data were analyzed by Langmuir and Freundlich isotherms. The DETA-MMT showed a high uptake capacity in room temperature and 84% dye removal was observed with 6 g L-1 of adsorbent, in only 2 min. The results revealed that freundlich isotherm fit the experimental results well. Standard free energy (ΔGo), standard enthalpy (ΔHo) and standard enthropy (ΔSo) were calculated by the data obtained from langmuir equation at different temperatures. All ΔGo and ΔHo values were negative indicating that the reactive blue adsorption was feasible and exothermic process.
 
 
 
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