Polyvinylidene Fluoride/Siloxane Nanofibrous Membranes for Long‐Term Continuous CO2‐Capture with Large Absorption‐Flux Enhancement. Issue 2 (5th November 2013)

• Record Type: Journal Article
• Authors: Lin, Yi‐Feng; Wang, Chi‐Sen; Ko, Chia‐Chieh; Chen, Chien‐Hua; Chang, Kai‐Shiun; Tung, Kuo‐Lun; Lee, Kueir‐Rarn
• Is Part Of: ChemSusChem. Volume 7:Issue 2(2014:Feb.)
• Page Start: 604
• Page End: 609
• Publication Date: 2013-11-05
• Subjects: Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201300578
• Languages: English
• ISSNs: 1864-5631

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>In a CO<sub>2</sub> membrane contactor system, CO<sub>2</sub> passes through a hydrophobic porous membrane in the gas phase to contact the amine absorbent in the liquid phase. Consequently, additional CO<sub>2</sub> gas is absorbed by amine absorbents. This study examines highly porous polyvinylidene fluoride (PVDF)/siloxane nanofibrous layers that are modified with hydrophobic fluoroalkylsilane (FAS) functional groups and successfully coated onto a macroporous Al<sub>2</sub>O<sub>3</sub> membrane. The performance of these materials in a membrane contactor system for CO<sub>2</sub> absorption is also investigated. Compared with pristine PVDF nanofibrous membranes, the PVDF/siloxane nanofibrous membranes exhibit greater solvent resistance and mechanical strength, making them more suitable for use in CO<sub>2</sub> capture by the membrane contactor. The PVDF/siloxane nanofibrous layer in highly porous FAS‐modified membranes can prevent the wetting of the membrane by the amine absorbent; this extends the periods of continuous CO<sub>2</sub> absorption and results in a high CO<sub>2</sub> absorption flux with a minimum of 500 % enhancement over that of the uncoated membranes. This study suggests the potential use of an FAS‐modified PVDF/siloxane nanofibrous membrane in a membrane contactor system for CO<sub>2</sub> absorption. The resulting hydrophobic membrane contactor also demonstrates the potential for large‐scale CO<sub>2</sub> absorption during post‐combustion processes in power plants.</p> </abstract>