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مرکز اطلاعات علمی SID1
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Title: 
Author(s): 

Issue Info: 
  • Year: 

    0
  • Volume: 

    9
  • Issue: 

    2
  • Pages: 

    -
Measures: 
  • Citations: 

    0
  • Views: 

    919
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2015
  • Volume: 

    9
  • Issue: 

    2
  • Pages: 

    5-12
Measures: 
  • Citations: 

    0
  • Views: 

    868
  • Downloads: 

    291
Abstract: 

Dye sensitized solar cells, benefiting from the properties of the dyes, are used to absorb photons, followed by releasing electrons and transfering them between the two electrodes of anode and cathode in order to produce electrical energy. Since natural dyes with affordability, accessibility and appropriate performance are suitable alternative low cost synthetic dyes, in this study, the natural dyes containing anthocyanins were used as the photo sensitizer to produce dye sensitized solar cells. In this project, anode and cathode were made, respectively, from TiO2 nanoparticles and platinum nano-particles on fluorine doped SnO2 transparent and conductive glass substrates and I3 -/I-, was used as the electrolyte. Natural source of Hibiscus tea was used to obtain natural dye for solar cell fabrication. Dye extraction by using suitable solvent and purification by extraction column with solid phase was performed. By electrochemical evaluation and calculating final efficiency of the constructed cell, its performance was investigated. Current-voltage curve was plotted and the efficiency of solar cell based on dye extracted from Hibiscus tea was achieved.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2015
  • Volume: 

    9
  • Issue: 

    2
  • Pages: 

    13-17
Measures: 
  • Citations: 

    0
  • Views: 

    624
  • Downloads: 

    562
Abstract: 

Nanostructured mixed metal oxides of CoxZn1-xAl2O4 (x= 0, 0.2, 0.4, 0.6, 0., 1) with a spinel structure were synthesized through a hybrid combustion method using microwave irradiation and electrical furnace and also chitosan as an environmentally benign fuel. The products were characterized with various techniques including X-ray diffraction (XRD) for structural, crystallinity, and morphological studies; transmission electron microscopy (TEM) for particle size evaluation; Fourier transform infrared spectroscopy (FT-IR)for molecular vibration studies and identification of the chemical groups. The objective of this work was exploring the possibility of synthesis of spinelicnano particles by different ratios of cobalt and zinc, applying chitosan as a new fuel and investigation of calcination temperature effects.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2015
  • Volume: 

    9
  • Issue: 

    2
  • Pages: 

    19-25
Measures: 
  • Citations: 

    0
  • Views: 

    1177
  • Downloads: 

    352
Abstract: 

In this research, nanoporousgraphene was synthesized by chemical vapor depositionover porous zinc oxide nanocatalyst. The product was characterized by scanning electron microscopy, transmission electron microscopy, Brauneur-Emmett-Teller isotherms, and X ray diffraction. The sorption of two samples of crude oil on to nanoporousgraphene was studied. Due to the high pore volume (1.17 cm3/g), large specific surface area (410 m2/g) and small pore size, high sorption capacity was achieved. Maximum sorption capacity of this nanoporousgraphene for two samples of crude oil (A) and (B) was 105.39 and 102.17 g crude oil/g nanosorbent, respectively. Crude oil samples sorbed on to nanoporousgraphene could be recovered by three methods of heat treatment, extraction with solvent, and filtration under mild suction with the proper recovery ratio. The recovery capacity of 99.01, 98.50, 98.05% was obtained by three methods, respectively. By means of these recycling methods, crude oil can be separated from nanosorbent and reused after the recovery. According to proper performance and good shaping ability of this nanosorbent, it can be used as a good candidate in the removal of oil spills.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2015
  • Volume: 

    9
  • Issue: 

    2
  • Pages: 

    27-36
Measures: 
  • Citations: 

    0
  • Views: 

    1109
  • Downloads: 

    788
Abstract: 

In this research, the mechanical properties of an epoxy resin-based polymer composite have been improved by functionalized (aminated) silicon carbide (SiC) nanoparticles. Three parameters: packing angle of carbon fibers,the weight percent of SiC, and the amount of curing agent were first considered. By carrying out the calculations and computer simulations and drawing overlaid curve, the amount of each parameter was determined. The surface of SiC nanoparticles was then immersed in HF and converted to Si-OH. The process was continued by immersing the SiC nano particles in functionalizing agent liquid, (3-aminopropyl) triethoxysilane (APTES), in intervals of 30, 45, 60 and 75 minutes. The mechanical tests indicated an elevation of 20.6 strain resistance and %21.3 of impact resistance with immersing for 60 minutes. The IR spectra verified the formation of silanol groups and curing of epoxy resin.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2015
  • Volume: 

    9
  • Issue: 

    2
  • Pages: 

    37-46
Measures: 
  • Citations: 

    0
  • Views: 

    999
  • Downloads: 

    262
Abstract: 

The aim of this research is to find a nano-catalyst supported by MWNT with high conversion and selectivity on NOx abatement. At first, the MWNT was oxidized by an acidic method and characterized by XRD, TEM, TGA, ASAP, and FTIR methods. Then the 12wt% MnOx over MWNT and Oxidized-MWNT were prepared by an incipient wetness impregnation technique. Comparing the result of 12wt% MnOx with MWNT/Oxidized-MWNT catalysts showed that introducing the oxygenated surface groups over the surface of the MWNT increased conversion and selectivity at 200 °C from 60 to 97 and 87 to 100%, respectively. ASAP and TEM analysis proved that the oxygenated groups improved dispersion of the active phase over the support by increasing the support surface area. Also, H2-TPR results showed increased reducibility of the catalyst by increasing availability of MnOx as the active phase through the oxygenated groups over Oxidized-MWNT.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2015
  • Volume: 

    9
  • Issue: 

    2
  • Pages: 

    47-54
Measures: 
  • Citations: 

    0
  • Views: 

    922
  • Downloads: 

    249
Abstract: 

In this work carbon mesoporous nano adsorbent (CMK-3) and silver doped mesoporous carbon nano composite Ag/CMK-3 were prepared by applying a hard template of silicateprecursor SBA-15 and characterized by N2 adsorption – desorption, transmision electron microscopy (TEM) and Energy Dispersive X-ray analysis (EDX). These prepared materials were applied as adsorbents for Orange G dye from aqueous solutions and their adsorption capability were compared with each other. Effects of contact time, pH, temperature, initial dye and salt concentrations on dye removal efficiency were investigated. Experimental results show that it takes an hour for both nano adsorbents to establish equilibrium with Orange G dye and also Ag/CMK-3 nano composite has more efficiency than CMK-3 for Orange G adsorption in the first 5 min of experiments for 21.74%. But after 40 min both adsorbents show the same surface adsorption of the dye. Furthermore, dye removal increases in high concentrations of salt up to 800 g/L and also initial dye upto 12 g/L and 40 g/L for CMK-3 and Ag/CMK-3, respectively. Dye removal decreases with increasing temperature from 30°C to 60°C and pH from 3 to 11.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Author(s): 

OLYA M.E.

Issue Info: 
  • Year: 

    2015
  • Volume: 

    9
  • Issue: 

    2
  • Pages: 

    55-62
Measures: 
  • Citations: 

    0
  • Views: 

    762
  • Downloads: 

    122
Abstract: 

In the present research, due to the carcinogenic effect of the colored wastewaters, the influence of key operational parameters such as pH, biomass dosage, dye concentration and temperature were studiedin a batch reactor. In this regards, an azo dye, one of the most common industrial dyes, are selected as a pollutant and the optimum condition for the adsorption of dye on biomass was attained. This condition for the adsorption of dye with the concentration of 20 ppm on 1 g of biomass was obtained at ambient temperature, pH= neutral, agitation speed of 150 rpm for 30 min. Kinetic and adsorption isotherms were evaluated for process scale up. In has been shown that the experimental data properly satisfy by the Langmuir and Freundlich isotherms. Also, it was found that the adsorption process follows the pseudo-second-order model.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2015
  • Volume: 

    9
  • Issue: 

    2
  • Pages: 

    63-73
Measures: 
  • Citations: 

    0
  • Views: 

    865
  • Downloads: 

    358
Abstract: 

This study reports an investigation on the removal of three acidic dyes, Acid Red 88, Acid Orange 2, and Acid Blue 92, from textile wastewater by chemical coagulation using Al2(SO4)3 and FeSO4 and by electrical coagulation using Fe electrodes. In addition, the effects of initial dye concentration, coagulant quantity, initial pH, and mixing conditions were explored in order to obtain optimum values for maximum decolorization. The results for chemical coagulation showed Al2 (SO4)3 to be much more effective than FeSO4 without taking account of the treatment conditions. Dye removal efficiency was up to 90% for 40 mg/L of Al2 (SO4) 3 with pH values ranging from 2 to 10 and dye concentration of up to 100 mg per liter. As for electrical coagulation, dye removal efficiency of up to 96% was achieved with pH values ranging between 4 to 9 at higher operating costs. Compared to chemical coagulation, electrical coagulation shows such advantages as stability against pH changes and reduced costs.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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