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Omid Bakhtiari - One of the best experts on this subject based on the ideXlab platform.
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stability and extraction study of phenolic wastewater treatment by supported liquid membrane using tributyl phosphate and sesame oil as liquid membrane
Chemical Engineering Research & Design, 2014Co-Authors: Pezhman Kazemi, Mohammad Peydayesh, Alireza Bandegi, Toraj Mohammadi, Omid BakhtiariAbstract:Abstract Phenols pose a risk to the environment and to human health. Phenol and its derivatives are toxic pollutants, frequently found in surface and tap waters, and in aqueous effluents from various manufacturing processes. In this paper, an experimental study regarding transport of phenol through a supported liquid membrane (SLM) using tributyl phosphate (TBP) and sesame oil as liquid membrane (LM) was performed. Factors affecting permeation of phenol such as initial phenol concentration, carrier concentration, feed Phase pH and Stripping Phase concentration were analyzed using Taguchi method. Optimal experimental condition of phenol transport was obtained using analysis of variance (ANOVA) after 7 h extraction (feed concentration: 200 mg/L; carrier concentration (%TBP): 40%; feed pH: 2; strip Phase concentration: 1.1 M). Mass transfer coefficient for this system was evaluated, and compared with similar works, and it was shown that it has the highest mass transfer rate. In addition to transport study, stability of the membrane was investigated by examination of Stripping Phase concentration, carrier concentration and salt concentration effects.
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Pertraction of methylene blue using a mixture of D2EHPA/M2EHPA and sesame oil as a liquid membrane
Chemical Papers, 2013Co-Authors: Pezhman Kazemi, Mohammad Peydayesh, Alireza Bandegi, Toraj Mohammadi, Omid BakhtiariAbstract:An experimental study on the pertraction of methylene blue (MB) through a supported liquid membrane (SLM) using a mixture of mono-(2-etylhexyl) ester of phosphoric acid (M2EHPA) and bis-(2-etylhexyl) ester of phosphoric acid (D2EHPA) and sesame oil as the liquid membrane (LM) was performed. Parameters affecting the pertraction of MB such as initial MB concentration, carrier concentration, feed Phase pH, and Stripping Phase concentration were analyzed. Optimal experimental conditions for MB pertraction (permeability of 5.63 × 10^−6) were obtained after a 7 h separation with the MB concentration in the feed Phase of 80 mg L^−1, D2EHPA/M2EHPA concentration in membrane Phase of 40 vol. %, feed pH of 6, and acetic acid concentration in the Stripping Phase of 0.4 mol L^−1. Kinetics of transport and stability of the SLM system were also studied and the mass transfer coefficient for this system was evaluated. Scanning electron microscopy (SEM) was used to morphologically characterize the membrane surface.
Francisco Jose Alguacil - One of the best experts on this subject based on the ideXlab platform.
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uphill permeation of cr vi using hostarex a327 as ionophore by membrane solvent extraction processing
Chemosphere, 2008Co-Authors: Francisco Jose Alguacil, Manuel Alonso, F A Lopez, Aurora LopezdelgadoAbstract:The transport of chromium by the emulsion pertraction technology (EPERT) using Hostarex A327 (tertiary amine) as a carrier has been investigated. The permeation of the metal is studied as a function of various experimental variables: hydrodynamic conditions, concentration of Cr(VI) and HCl in the source Phase, carrier concentration and diluent in the organic Phase, strippant concentration in the Stripping Phase and support characteristics of the membrane. The mass transfer coefficient and the thickness of the aqueous source boundary layer were estimated from the experimental data. Furthermore, the selectivity of the Hostarex A327-bases EPERT towards different metal ions and the behaviour of the system against other carriers are presented.
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transport of chromium vi through a cyanex 923 xylene flat sheet supported liquid membrane
Hydrometallurgy, 2000Co-Authors: Francisco Jose Alguacil, A G Coedo, M T DoradoAbstract:Abstract The present investigation deals with carrier-facilitated membrane transport of chromium (VI) from chloride media across a flat-sheet supported liquid membrane (FSSLM) using as organic reagent the phosphine oxide, Cyanex 923. The permeation of Cr (VI) has been studied under various experimental conditions: stirring speed of the source Phase, initial metal and carrier concentrations, organic Phase diluent, HCl concentration in the source Phase, composition of the Stripping Phase and support characteristics. The mass transfer coefficient was calculated as 67 μm/s and the thickness of the aqueous boundary layer was calculated to be 15 μm. Chromium permeation and thus speciation across the membrane was also investigated, and the order found was: CrO 4 2− =Cr 2 O 7 2− >Cr 3+ .
M T Dorado - One of the best experts on this subject based on the ideXlab platform.
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transport of chromium vi through a cyanex 923 xylene flat sheet supported liquid membrane
Hydrometallurgy, 2000Co-Authors: Francisco Jose Alguacil, A G Coedo, M T DoradoAbstract:Abstract The present investigation deals with carrier-facilitated membrane transport of chromium (VI) from chloride media across a flat-sheet supported liquid membrane (FSSLM) using as organic reagent the phosphine oxide, Cyanex 923. The permeation of Cr (VI) has been studied under various experimental conditions: stirring speed of the source Phase, initial metal and carrier concentrations, organic Phase diluent, HCl concentration in the source Phase, composition of the Stripping Phase and support characteristics. The mass transfer coefficient was calculated as 67 μm/s and the thickness of the aqueous boundary layer was calculated to be 15 μm. Chromium permeation and thus speciation across the membrane was also investigated, and the order found was: CrO 4 2− =Cr 2 O 7 2− >Cr 3+ .
Pezhman Kazemi - One of the best experts on this subject based on the ideXlab platform.
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stability and extraction study of phenolic wastewater treatment by supported liquid membrane using tributyl phosphate and sesame oil as liquid membrane
Chemical Engineering Research & Design, 2014Co-Authors: Pezhman Kazemi, Mohammad Peydayesh, Alireza Bandegi, Toraj Mohammadi, Omid BakhtiariAbstract:Abstract Phenols pose a risk to the environment and to human health. Phenol and its derivatives are toxic pollutants, frequently found in surface and tap waters, and in aqueous effluents from various manufacturing processes. In this paper, an experimental study regarding transport of phenol through a supported liquid membrane (SLM) using tributyl phosphate (TBP) and sesame oil as liquid membrane (LM) was performed. Factors affecting permeation of phenol such as initial phenol concentration, carrier concentration, feed Phase pH and Stripping Phase concentration were analyzed using Taguchi method. Optimal experimental condition of phenol transport was obtained using analysis of variance (ANOVA) after 7 h extraction (feed concentration: 200 mg/L; carrier concentration (%TBP): 40%; feed pH: 2; strip Phase concentration: 1.1 M). Mass transfer coefficient for this system was evaluated, and compared with similar works, and it was shown that it has the highest mass transfer rate. In addition to transport study, stability of the membrane was investigated by examination of Stripping Phase concentration, carrier concentration and salt concentration effects.
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Pertraction of methylene blue using a mixture of D2EHPA/M2EHPA and sesame oil as a liquid membrane
Chemical Papers, 2013Co-Authors: Pezhman Kazemi, Mohammad Peydayesh, Alireza Bandegi, Toraj Mohammadi, Omid BakhtiariAbstract:An experimental study on the pertraction of methylene blue (MB) through a supported liquid membrane (SLM) using a mixture of mono-(2-etylhexyl) ester of phosphoric acid (M2EHPA) and bis-(2-etylhexyl) ester of phosphoric acid (D2EHPA) and sesame oil as the liquid membrane (LM) was performed. Parameters affecting the pertraction of MB such as initial MB concentration, carrier concentration, feed Phase pH, and Stripping Phase concentration were analyzed. Optimal experimental conditions for MB pertraction (permeability of 5.63 × 10^−6) were obtained after a 7 h separation with the MB concentration in the feed Phase of 80 mg L^−1, D2EHPA/M2EHPA concentration in membrane Phase of 40 vol. %, feed pH of 6, and acetic acid concentration in the Stripping Phase of 0.4 mol L^−1. Kinetics of transport and stability of the SLM system were also studied and the mass transfer coefficient for this system was evaluated. Scanning electron microscopy (SEM) was used to morphologically characterize the membrane surface.
Grazyna Szczepanska - One of the best experts on this subject based on the ideXlab platform.
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donnan dialysis a new predictive model for non steady state transport
Journal of Membrane Science, 2017Co-Authors: Piotr Szczepanski, Grazyna SzczepanskaAbstract:Abstract A bond−graph model has been developed and applied to analyze the non−steady state transport kinetics of K+ cations in the Donnan dialysis (DD) process. The model is based on a pseudo−thermodynamic network analysis and takes into account all the simultaneously occurring processes and phenomena, i.e. diffusion through aqueous layers, interfacial and membrane ion−exchange kinetics, interdiffusion of K+ and H+ cations, diffusion of a free electrolyte in the membrane, and the osmotic transport of water. Moreover, membrane morphology represented by its heterogeneity and non−uniform distribution of ionogenic groups has been included in the model. The numerical simulations of fluxes demonstrated that the DD efficiency in the investigated system results from osmotic water transport as well as an electrolyte solution sorption into the cation−exchange membrane. These phenomena cause dilution of the Stripping Phase and enable free diffusion of the electrolyte between the external solutions, respectively. The reverse K+ ions flux from the Stripping solution into the feed one observed in DD experiments results from the interdiffusion and non−exchange diffusion of the electrolyte. The numerical calculation results were compared with the experimental data measured for the DD systems operating with a low feed solution concentration (cf=0.01 M) and high Stripping solution concentration (cs up to 1 M) resulting in observable osmotic flux of water. It was found that the developed model can be applied for the prediction of time−dependent concentration in the DD system. Consequently, the prediction of fluxes, concentration factors, recovery factors, etc. is also possible. The model calculations enable also the prediction of the experimental results as dependent on one of the main factors which influence DD efficiency, i.e. the Stripping Phase concentration.
