Surface-etched halloysite nanotubes in mixed matrix membranes for efficient gas separation

Abstract

, Surfaceetched halloysite nanotubes in mixed matrix membranes for efficient gas separation, Separation and Purification Technology (2016), doi: http://dx.doi.org/10.1016/j.seppur. 2016.09.015 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractPossessing the advantages of both polymeric membranes and the specific inorganic nanoparticles or nanotubes, mixed matrix membranes (MMMs) have captured the imagination of researchers for a possible technological breakthrough for efficient gas separation. However, it is still very challenging to achieve defect-free interface between fillers and polymer matrix. In this study, the naturally abundant and low cost halloysite nanotubes (HNTs) were applied as fillers for MMMs synthesis. To improve the filler dispersion and filler-matrix interface affinity, the raw HNTs were modified by either alkali etching or (3-Aminopropyl) triethoxysilane grafting. After surface etching, the defect holes were formed on the surfaces of etched-HNTs, resulting in the rougher HNT walls and significant increment of surface area and CO 2 adsorption capacity.

Superior Pebax‐1657/amine‐modified halloysite nanotubes mixed‐matrix membranes to improve the CO2/CH4 separation efficiency

“…Ge et al used alkali etching to modify surface of HNTs for improving their high surface area, pore‐volume, and gas adsorption capacity. Then, the etched‐HNTs were introduced into the 6FDA‐durene polyimide matrix, and the gases (CO 2 , N 2 , and CH 4 ) permeation tests displayed both higher permeability and selectivity of the resulting MMM when the etched‐HNTs were incorporated into the polymer matrix 23 . In another research by Surya Murali et al, HNTs were incorporated into the polysulfone matrix to prepare MMMs to study their CO 2 /CH 4 , CO 2 /N 2 , and O 2 /N 2 separation efficiencies.…”

Mitigating the Agglomeration of Nanofiller in a Mixed Matrix Membrane by Incorporating an Interface Agent

“…Focused ion beam scanning electron microscopy (FIB-SEM) was applied to evaluate the dispersion of nanodiamond in the Pebax matrix by using an FEI SCIOS FIB/SEM dual beam system. The description of the method is shown in our previous studies [ 36 , 37 , 38 , 39 ]. A hole was milled on the surface of the MMM by Ga + FIB ( Figure S1 ).…”

Development of αFe2O3-TiO2/PPOdm Mixed Matrix Membrane for CO2/CH4 Separation

“…Priming and mechanical dispersion presents itself with drawbacks whereby priming only applicable to low weight loading and the latter causes damage towards particles [2,3]. As for functionalization and hybrid fillers, various combinations and studies have been conducted to investigate their effects into finding the right match for gas separation performance improvement fillers [4,5].…”