Calix[4]arene‐filled poly dimethylsiloxane (PDMS) membranes for the pervaporative removal of benzene from dilute aqueous solution

Liu, Liang; Jiang, Zhongyi; Pan, Fusheng

doi:10.1002/app.23468

Cited by 5 publications

(4 citation statements)

References 35 publications

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“…E P is a useful tool for understanding the PV separation properties of a hybrid membrane. Some researchers have used the relationship of the permeation flux against the feed temperature to predict the PV separation properties of membranes and have achieved fruitful results 10, 21. As reported, the E P (J/mol) value can be calculated with the following Arrhenius‐type expression:10 or where J P is the permeation flux of the component (g m −2 h −1 ), J 0 is the pre‐exponential factor, R is the gas constant (8.314 J/mol K), and T is the solution temperature (K).…”

Section: Resultsmentioning

confidence: 99%

Separation of methanol from methanol/water mixtures with pervaporation hybrid membranes

Nie

Liu

et al. 2012

J of Applied Polymer Sci

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A series of pervaporation (PV) hybrid membranes were prepared via the crosslinking of poly(vinyl alcohol) with formaldehyde solution with N-3-(trimethoxysilyl) propyl ethylenediamine (TMSPEDA) as a hybrid precursor of the sol-gel process. Both the thermal stability and separation performances of the prepared hybrid membranes were investigated. Thermogravimetric analysis showed that the thermal degradation temperature of the hybrid membranes was beyond 250 C. Differential scanning calorimetry indicated that both the glass-transition temperature and the crystallization temperature increased with elevated TMSPEDA contents in the hybrid membranes. PV experiments demonstrated that for membranes A-D, both the permeation flux and separation factor indicated the same trade-off effect. Moreover, it was found that for individual membranes, the permeation flux increased as the feed temperature was increased. Meanwhile, the separation factor revealed an change trend opposite to that of the permeation flux. Furthermore, proper addition of TMSPEDA in the hybrid membrane was found to reduce the permeation activation energy. On the basis of these findings, we deduced that these hybrid membranes have potential applications in the separation of methanol/water mixtures.

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Section: Resultsmentioning

confidence: 99%

Separation of methanol from methanol/water mixtures with pervaporation hybrid membranes

Nie

Liu

et al. 2012

J of Applied Polymer Sci

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“…Poly(dimethylsiloxane) (PDMS) membranes filled with calixarene (CA) were reported for pervaporative removal of benzene from its dilute aqueous solution. , Compared with the unfilled PDMS membranes, those membranes filled with CA exhibited higher permselectivity toward benzene. In particular, the unusual change of permeation rate in such membranes was observed .…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation of Diffusion Behavior of Benzene/Water in PDMS-Calix[4]arene Hybrid Pervaporation Membranes

Pan

Fang

et al. 2008

Ind. Eng. Chem. Res.

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Molecular dynamics (MD) simulation was employed to investigate diffusion behavior of small penetrants in rubbery-polymer-based hybrid membranes, using pervaporative removal of benzene from its dilute solution by poly(dimethylsiloxane) (PDMS) membranes filled with calix[4]arene (CA) as the model system. In our previous experimental investigation, the normalized permeation rate of benzene (NPR b ) and separation factor (benzene/water) through PDMS-CA hybrid membranes did not follow the usual monotonous or single peak/ valley change, but accompanied minimum and maximum values instead. In the present study, nonbonding interaction energy between PDMS and CA, mean-square displacement (MSD), free volume characteristics, and diffusion coefficients of benzene and water in pure PDMS and hybrid membranes were analyzed by molecular dynamics simulation. The simulation results revealed that MSD and fractional free volume (FFV) values were closely dependent on interaction energy. Diffusion coefficients of benzene and water at "infinite dilution" and saturated condition displayed the same changing tendency, although the values at saturated condition were a bit larger. Moreover, it was observed that diffusion coefficients were not only related to FFV but also affected by the interaction between CA and the penetrants. Overall, the MD results agreed well with the experimental results.

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“…Understanding permeation activation energy ( E P ) can enhance the further investigation of PV separation properties of a hybrid membrane. Some researchers used permeation flux against feed temperature to predict the PV separation properties of membranes and have achieved fruitful results 9, 18. Presently, E P (J/mol) can be calculated based on the following Arrhenius‐type expression18: or, where J P is the permeation flux of component (g/m 2 h), J 0 is the pre‐exponential factor, R is the gas constant (8.314 J/mol K), and T is the solution temperature (K).…”

Section: Resultsmentioning

confidence: 99%

“…For such purpose, various innovative techniques are newly developed. Among these, inorganic/organic hybrid is considered as one of the most effective methods to improve the permeation flux and selectivity of PV membranes 7–11. For example, Ohshima et al7 prepared a series of organic/inorganic hybrid membranes for the removal of 0.05 wt % benzene/water mixed solution, and found that hybridization of organic and inorganic moieties can increase the membrane selectivity.…”

Section: Introductionmentioning

confidence: 99%

Pervaporation separation of isopropanol/benzene mixtures using inorganic–organic hybrid membranes

Liu

et al. 2010

J of Applied Polymer Sci

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A series of pervaporation hybrid membranes were prepared from polyethylene glycol (PEG) and phenylaminomethyl trimethoxysilane (PAMTMS) based on the sol-gel process, in which PEG was used as an organic moiety to improve the affinity for organic alcohols and silicone of PAMTMS was used as inorganic moiety to increase the permeation flux of organic species. Their application to separate isopropanol/benzene mixtures was investigated. FTIR spectra confirmed the reaction products. DSC measurement revealed that the influence of PEG content on the T g and thermal behavior of membranes A, B, and C. FE-SEM images exhibited that phaseseparated structure has occurred when the PEG content elevated to some extent. Pervaporation experiments showed that the permeation flux increased and the separation factor decreased with an increase in isopropanol (IPA) content in feed at 30 C. Meanwhile, the separation factor increased with an increase in feed temperature at 60 vol % IPA content. Moreover, it was found that the permeation flux was independent of the feed temperature, suggesting that feed temperature has little impact on the thermal motion of polymer chains. The increasing crosslinking degree in hybrid matrix might be responsible for such trend. Based on these findings, it can be concluded that these pervaporation hybrid membranes have potential applications in the separation of isopropanol/benzene binary mixtures.

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Calix[4]arene‐filled poly dimethylsiloxane (PDMS) membranes for the pervaporative removal of benzene from dilute aqueous solution

Cited by 5 publications

References 35 publications

Separation of methanol from methanol/water mixtures with pervaporation hybrid membranes

Separation of methanol from methanol/water mixtures with pervaporation hybrid membranes

Molecular Dynamics Simulation of Diffusion Behavior of Benzene/Water in PDMS-Calix[4]arene Hybrid Pervaporation Membranes

Pervaporation separation of isopropanol/benzene mixtures using inorganic–organic hybrid membranes

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