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- 저자 : Mehran Arzani (검색결과 2 건)
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Navid Azizi,Mehran Arzani,Hamid Reza Mahdavi,Toraj Mohammadi 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.9
One of the effective techniques for improving separation properties of polymeric membranes is incorporation of suitable nanoparticles into their matrices. This study presents the preparation of three types of nanocomposite membranes comprising three grades of poly (ether-block-amide) (Pebax 1074, Pebax 1657 and Pebax 2533) and modified multi-walled carbon nanotubes (MWCNTs) with different loadings (1, 1.5, 2 and 2.5 wt%). The prepared membranes were characterized by field emission scanning electron microscopy (FESEM), attenuated total reflection-Fourier transfer infrared spectroscopy (ATR-FTIR) and X-ray diffraction (XRD). Permeation of CO2 and CH4 gases through the prepared membranes was measured at the pressure range of 2-8 bars and 25 oC. The results showed that the incorporation of MWCNTs into the polymers matrices improves CO2/CH4 selectivity. Further, Pebax 1074/MWCNT nanocomposite membrane exhibits better performance for CO2/CH4 separation compared to the neat Pebax and the two other nanocomposite membranes.
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Hamid Reza Mahdavi,Mehran Arzani,Hamed Faramarzi,Omid Bakhtiari,Toraj Mohammadi 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
The stability of the ceramic supported liquid membranes (SLMs) is one of the most interesting researchsubjects. In this work, the SLMs’ stability for CO2/CH4 separation was investigated. Following pressing a-Al2O3 substrates at 400, 600, and 800 bar, colloidal and polymeric TiO2 intermediate and top layers werecoated. Aqueous diethanolamine (DEA) solution was used as solvent in the SLM to optimize supportstructure based on CO2/CH4 separation performance. The pressed support at 800 bar and coated withTiO2 demonstrated best performance and selected for further study. Subsequently, 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]) ionic liquid (IL) was immobilized inside theselected support and used as the supported ionic liquid membrane (SILM) for CO2/CH4 separation. TheSILM separation performance was evaluated under different pressures and temperatures. Temperaturewas found to has greater effect than pressure due to a decrease in IL’s viscosity and an increase in penetrantdiffusivity. At 25 C and 1 bar, SILM exhibited consistent and reliable performance as CO2 and CH4permeabilities of 244.0 and 7.4 Barrer, respectively, and CO2/CH4 selectivity of 33.0 over 6 h. The findingscontribute to understanding the implementation of multilayer ceramic SILMs for CO2/CH4 separation andhighlight its potential along with opening up new avenues.
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