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Gonābād, Iran

Norouzi M.,Ferdowsi University of Mashhad | Pakizeh M.,Ferdowsi University of Mashhad | Namvar-Mahboub M.,University of Gonabad
Desalination and Water Treatment | Year: 2016

In this study, functionalized multi-walled carbon nanotubes (F-MWCNTs) were used to modify the polyvinylidene fluoride (PVDF)/polyvinyl chloride (PVC) blend UF membrane via solution blending method. The effect of F-MWCNTs dosage (0–1%) on the properties and performance of PVDF/PVC/F-MWCNTs membranes was investigated. The prepared blend membranes were characterized by Fourier Transform Infrared spectroscopy (FT-IR), Scanning Electron Microscopy (SEM), Field Emission Scanning Electron Microscopy (FESEM), contact angle, and tensile strength techniques. Results showed that hydrophilicity of membranes was enhanced with increase of F-MWCNTs content. The performance of the membranes was evaluated in terms of pure water flux (PWF) and dextran filtration. The results showed that presence of F-MWCNTs in polymer matrix improved performance and antifouling properties of PVDF/PVC blend membrane. Accordingly, incorporation of 0.3–0.5 wt.% of F-MWCNTs represented maximum dextran rejection and permeate flux, respectively. © 2016 Balaban Desalination Publications. All rights reserved.

Dastbaz Z.,Ferdowsi University of Mashhad | Pakizeh M.,Ferdowsi University of Mashhad | Namvar-Mahboub M.,University of Gonabad
Desalination and Water Treatment | Year: 2016

In this study, the influence of functionalized multi-walled carbon nanotube (F-MWCNT), sodium dodecyl sulfate (SDS) on the characteristic and performance of polyacrylonitrile (PAN) membrane was studied. The mixed matrix membranes were prepared via solution blending and phase inversion methods. MWCNTs were acidified and then functionalized by amino group using microwave. Three dosage of F-MWCNT, i.e. 0.5, 1 and 2 wt.%, and two dosage of SDS, i.e. 2.5 and 5 wt.%, were used to prepare mixed matrix membranes. The as-prepared membranes were characterized by scanning electron microscopy (SEM), field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), contact angle, and Fourier transform infrared spectroscopy. The hydrophilicity and pure water flux increased with addition of both additives. Separation performance of Bovine serum albumin (BSA) was investigated in three different pHs (5, 7 and 9). The results showed that both additives enhanced performance parameters of pure PAN membrane. From the results it is found that 0.5 wt.% of F-MWCNT and 2.5 wt.% of SDS, are the optimum values to achieve maximum permeate flux and BSA rejection, respectively. © 2016 Balaban Desalination Publications. All rights reserved.

Mohammadzadeh Kakhki R.,University of Gonabad
Arabian Journal of Chemistry | Year: 2014

The unique properties of carbon fiber electrodes (CFEs) offer a number of particular advantages for their use in analytical applications. However, some pretreatment is usually necessary for the modification of the carbon surface. One of these methods is enzyme modification, that enzyme reactions in the surface of the electrode can be useful for the certain determinations. Also application of nanoparticles is very useful for modification and gives very interesting responses for the electrode in the determination of various analytes. Electrochemical oxidation of a carbon surface is one of the other methods for modification. With this work the morphology of the surface changes as well as increasing the coverage by various oxygen-containing functional groups. These groups can then interact and bind with other species introduced to the surface. The modification of the surface of carbon fiber electrodes is an interesting topic with many applications in the fields of analytical chemistry, environmental and health science, fuel cell and biofuel cell and many others. In this review article we discussed about the various modification methods for carbon fiber electrodes and applications of these CFEs. © 2014 The Author.

Pourhoseini S.H.,University of Gonabad | Moghiman M.,Ferdowsi University of Mashhad
Journal of Enhanced Heat Transfer | Year: 2014

Natural gas, as a major source of clean energy, has low thermal radiation. Because radiation transfers a considerable portion of heat generated by flame, improving the radiation characteristics of flame is necessary. The aim of this study was to investigate how the injection of small quantities of micro kerosene droplets into a natural-gas flame helps enhance the flame's thermal radiation and consequently its thermal efficiency. For this purpose, a micronozzle injected kerosene droplets into a natural-gas nonluminous flame. Using an IR filter, a digital camera, an S-type thermocouple, a calibrated thermopile, and image processing software, along with numerical modeling, the radiation properties of a flame were studied. The results show that the injection of kerosene droplets causes an increase of 52% and 11.75% in thermal radiation and efficiency, respectively. Also, mean flame temperature increases by no more than 8% whereas the mean flame emissivity coefficient increases remarkably. © 2014 by Begell House, Inc.

Kakhki R.M.,University of Gonabad
Russian Journal of Applied Chemistry | Year: 2016

The surface structure of common graphite electrodes are suitable for electrochemical detection of various analytes due to their favorable properties such as good conductivity and resistance to environmental and chemical hazards. Also this material is cheap and available. Modifying the surface of electrode improves their ability for various determinations. Modifying graphite electrodes with nanoparticles has attracted lots of attention due to their unique characteristics. In this article we review applications of modified graphite electrodes with nanomaterials. © 2016, Pleiades Publishing, Ltd.

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