در هنگام جستجو کلمه در قسمت عنوان میتوانید کلمات مورد جستجو را با کاراکتر (-) جدا کنید.
کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Ultrafine Grained and Nanostructured Materials
- نوع مقاله: Journal Article
- کلمات کلیدی: Chitosan,montmorillonite,Pervaporation,phenol and chlorophenols,nanocomposite membrane
- چکیده:
- چکیده انگلیسی: The novel nanocomposite membranes were successfully prepared by the incorporation of different concentrations (5, 10, and 15 wt%) of montmorillonite (MMT) as a nanoadditive into a blend of chitosan/polystyrene (CS/PS) at a ratio of 3:1 on the basis of solution-casting method and they were subsequently used for the separation of phenol, p-chlorophenol, and 2,4-dichlorophenol from water through pervaporation process. The effects of feed composition, the MMT content, and various feed types were investigated on pervaporation performance. All the membranes were water selective and the permeation rate increased with increasing the MMT content. The presence of MMT, increased the hydrophilicity of CS/PS blend polymer matrix, resulting in the formation of a higher flux to water molecules. The best separation performance was achieved for the CS/PSMMT-15 nanocomposite membrane containing a 15 wt % of MMT with 2,4-dichlorophenol in the feed, i.e., the 2,4-dichlorophenol concentration from 0.1 to 0.4 wt %, the flux values from 10.7 to 14.2 g/m2.h and the separation factor from 1784 to 721. The separation of 2,4-dichlorophenol/water mixture proceeded easier than that of the phenol/water and p-chlorophenol/water mixtures because of the larger molecular size of 2,4-dichlorophenol and the relatively weak coupling phenomenon with the water molecules and hydrophilic membranes.
- انتشار مقاله: 03-10-1397
- نویسندگان: Shafagh Mokhtarzadeh,Farahman Hakimpour,Samira Agbolaghi,Yaghoub Mansourpanah
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Membrane Science and Research
- نوع مقاله: Journal Article
- کلمات کلیدی: morphology,PA thin layer,Inorganic salt,STPP
- چکیده:
- چکیده انگلیسی: In this work, the effect of presence of the sodium tripolyphosphate (STPP), as an inorganic salt, on improving the performance of polyamide (PA) thin layer membranes has been studied. Characterization analyses confirmed the presence of the salt on the whole surface structure of the thin layer. Different salt loadings resulted in different fluxes and Cu (II) rejections. The thin layer containing 1% w/w STPP showed favorable flux and relatively good rejection for the Cu2+ ions. However, the best rejection was obtained for 5% w/w STPP. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) images confirmed the formation of a dense and compact surface in the presence of STPP in the aqueous phase.
- انتشار مقاله: 11-10-1395
- نویسندگان: Yaghoub Mansourpanah,Parivash M. Rashnou
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Membrane Science and Research
- نوع مقاله: Journal Article
- کلمات کلیدی:
- چکیده:
- چکیده انگلیسی:
- انتشار مقاله: 11-10-1395
- نویسندگان: Yaghoub Mansourpanah,Yaghoub Mansourpanah,Yaghoub Mansourpanah
- مشاهده
- جایگاه : پژوهشی
- مجله: Biofuel Research Journal
- نوع مقاله: Journal Article
- کلمات کلیدی: Fuel cell,Proton Exchange Membrane,Organic-inorganic nanocomposite,Inorganic fillers
- چکیده:
- چکیده انگلیسی: Combination of inorganic fillers into organic polymer membranes (organic–inorganic hybrid membranes) has drawn a significant deal of attention over the last few decades. This is because of the incorporated influence of the organic and inorganic phases towards proton conductivity and membrane stability, in addition to cost decline, improved water retention property, and also suppressing fuel crossover by increasing the transport pathway tortuousness. The preparation methods of the composite membranes and the intrinsic characteristics of the used particles as filler, such as size, type, surface acidity, shape, and their interactions with the polymer matrix can significantly affect the properties of the resultant matrix. The membranes currently used in proton exchange membrane fuel cells (PEMFCs) are perfluorinated polymers containing sulfonic acid, such as Nafion®. Although these membranes possess superior properties, such as high proton conductivity and acceptable chemical, mechanical, and thermal stability, they suffer from several disadvantages such as water management, CO poisoning, and fuel crossover. Organic-inorganic nanocomposite PEMs offer excellent potentials for overcoming these shortcomings in order to achieve improved FC performance. Various inorganic fillers for the fabrication of composite membranes have been comprehensively reviewed in the present article. Moreover, the properties of polymer composites containing different nanoparticles have been thoroughly discussed.
- انتشار مقاله: 25-06-1395
- نویسندگان: Kolsoum Pourzare,Yaghoub Mansourpanah,Saeed Farhadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Biofuel Research Journal
- نوع مقاله: Journal Article
- کلمات کلیدی: Fuel cell,Proton Exchange Membrane,Organic-inorganic nanocomposite,Inorganic fillers
- چکیده:
- چکیده انگلیسی: Combination of inorganic fillers into organic polymer membranes (organic–inorganic hybrid membranes) has drawn a significant deal of attention over the last few decades. This is because of the incorporated influence of the organic and inorganic phases towards proton conductivity and membrane stability, in addition to cost decline, improved water retention property, and also suppressing fuel crossover by increasing the transport pathway tortuousness. The preparation methods of the composite membranes and the intrinsic characteristics of the used particles as filler, such as size, type, surface acidity, shape, and their interactions with the polymer matrix can significantly affect the properties of the resultant matrix. The membranes currently used in proton exchange membrane fuel cells (PEMFCs) are perfluorinated polymers containing sulfonic acid, such as Nafion®. Although these membranes possess superior properties, such as high proton conductivity and acceptable chemical, mechanical, and thermal stability, they suffer from several disadvantages such as water management, CO poisoning, and fuel crossover. Organic-inorganic nanocomposite PEMs offer excellent potentials for overcoming these shortcomings in order to achieve improved FC performance. Various inorganic fillers for the fabrication of composite membranes have been comprehensively reviewed in the present article. Moreover, the properties of polymer composites containing different nanoparticles have been thoroughly discussed.
- انتشار مقاله: 25-06-1395
- نویسندگان: Kolsoum Pourzare,Yaghoub Mansourpanah,Saeed Farhadi
- مشاهده