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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Algorithms and Computation
- نوع مقاله: Journal Article
- کلمات کلیدی: modeling,Gas Separation,Asymmetric Membrane,Permeance
- چکیده:
- چکیده انگلیسی: It is several decades that the application of membrane processes for gas separation has become a great concern within industries. Among them, the polymeric membranes of different structures have played the most important role. Such application has been widely extended to gas separation and due to the necessity of both; prediction of the behavior of these processes and recognition of the effective parameters on membrane processes, in this research a mathematical model of mass transfer through polymeric asymmetric membranes is presented. Within the dense section of the membrane, a dual sorption model is applied, while for the porous section, the average effect of the four flow mechanisms; namely Knudsen, viscous, slip as well as surface flow are implemented. Basing on the experimental values of gas permeances through different membranes and by using a proper optimization method, the available membrane transport parameters were determined.
- انتشار مقاله: 22-02-1392
- نویسندگان: Sara Farhangi,Mojtaba Shariati Niasar,Mohammad Soltanieh,Mehdi Pourafshari Chenar
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Pervaporation,MFI nano-zeolite membrane,BTX compounds,wastewaters
- چکیده:
- چکیده انگلیسی: MFI zeolite membranes were prepared on porous α-alumina substrates, using secondary growth of nano-seeded layers. The resulting membranes were characterized by means of Scanning Electron Microscopy (SEM), X-Ray Diffractometry (XRD), and pervaporation performance tests for separation of Benzene, Toluene and Xylene (BTX) mixture from contaminated water. The morphology, thickness, homogeneity, crystal preferential orientation and permeation properties of these membranes have been studied in relation to the seed layers. Successful separation of BTX mixture from water was performed by using the manufactured MFI zeolite membrane. The influence of temperature, feed concentration on the membrane separation efficiency systematically investigated. The total permeation fluxes were found to increase with increase in temperature and feed concentration. The separation factors increased with increasing feed concentration and decreased with increasing in temperature.
- انتشار مقاله: 12-11-1388
- نویسندگان: Rezvan Torkaman,Hossein Kazemian,Mohammad Soltanieh
- مشاهده
- جایگاه : پژوهشی
- مجله: Asian Journal of Green Chemistry
- نوع مقاله: Journal Article
- کلمات کلیدی: Photocatalytic activity,Green synthesis,Biosurfactants,Titanium dioxide nanoparticle,Sol-gel method
- چکیده:
- چکیده انگلیسی: Green synthesis of nanoparticles using plant extracts is a new method to develop environmentally safe nanoparticles, which can be used in numerous applications. In this study, TiO2 nanoparticles were synthesized from tetra-n-butyl orthotitanate using the vegetal surface active substances extracted from Glycyrrhiza glabra plant via sol-gel method. The synthesized nanoparticles were characterized using X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (UV/DRS), and Fourier-transform infrared spectroscopy (FT-IR). The morphology of the TiO2 powder was characterized using transmission electron microscopy (TEM) and the results indicated that TiO2 particles were nanospheres with a diameter of 60-70 nm. The photocatalytic activity of titania was investigated using the photodegradation of methylene blue, and acid red 88 and coumarin 30 solutions under UV irradiation. The results indicated that the photocatalytic activity of the TiO2 nanoparticles that was carried out by the degradation of MB solution was higher than AR 88 and coumarin 30. Moreover, the same photocatalytic effects on different dyes was not observed for the same size titania nanoparticles.
- انتشار مقاله: 05-02-1398
- نویسندگان: Zahra Madadi,Mohammad Soltanieh,Tayebe Bagheri Lotfabad,Beheshteh Sohrabi Nazari
- مشاهده