Preparation, characterization, and applicability of novel calix[4]arene‐based cellulose acetate membranes in gas permeation

Abstract

Cellulose acetate (CA) is well known glassy polymer used in the fabrication of gas-separation membranes. In this study, 5,11,17,23-tetrakis(N-morpholinomethyl)-25,26,27,28-tetrahydroxycalix[4]arene (CL) was blended with CA to study the gaspermeation behavior for CO 2 , N 2 , and CH 4 gases. We prepared the pure CA and CA/CL blended membranes by following a diffusion-induced phase-separation method. Three different concentrations of CL (3, 10, and 30 wt %) were selected for membrane preparation. The CA/CL blended membranes were then characterized via Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray diffraction analysis. The homogeneous blending of CL and CA was confirmed in the CA/CL blended membranes by both SEM and AFM analysis. In addition to this, the surface roughness of the CA/CL blended membranes also increased with increasing CL concentration. FTIR analysis described the structural modification in the CA polymer after it was blended with CL too. Furthermore, CL improved the tensile strength of the CA membrane appreciably from 0.160 to 1.28 MPa, but this trend was not linear with the increase in the CL concentration. CO 2 , CH 4 , and N 2 gases were used for gas-permeation experiments at 4 bars. With the permeation experiments, we concluded that permeability of N 2 was higher in comparison to those of CO 2 and CH 4 through the CA/CL blended membranes. V C 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39985.

Comparison of silica and novel functionalized silica-based cellulose acetate hybrid membranes in gas permeation study

“…The unique combinational influence of calixarene and Si on the gas permeation efficiency of CA membrane can also be investigated. Furthermore, this study is in continuation of our previously published data, in which 5,11, 17,23-tetrakis(N-morpholinomethyl)-25,26,27,28-tetrahydroxycalix [4]arene was blended with CA to prepare CA blended membranes, and their permeation abilities were checked towards N 2 , CO 2 and CH 4 gases [50]. Therefore, Si was functionalized with p-tetranitrocalix [4]arene (Si-CL) ( Fig.…”

Synthesis, Characterization and NH3/N2 Gas Permeation Study of Nanocomposite Membranes

“…1 [33], which incorporates Gas cylinder (1), Membrane module (2), Pressure regulators (3,4), Valve (5), Flow meter (6).…”

CO 2 adsorption using TiO 2 composite polymeric membranes: A kinetic study

“…The adsorption kinetics and adsorption capacity of the membrane affected the permeability of CO 2 through CA-CL blended membranes. The permeability of N 2 gas was recorded considerable high then CO 2 gas through these membranes (Farrukh et al, 2014a).…”