Designing and Fabricating Highly CO2-Selective Composite Membranes Inspired by Iron-Fortified Mussel Adhesive System

Monday, October 17, 2011
Exhibit Hall B (Minneapolis Convention Center)
Yifan Li, Shaofei Wang, Hong Wu, Ben Li, Jingtao Wang, Zhongyi Jiang and Fusheng Pan, Key Laboratory for Green Chemical Technology of Ministry of Education, Sch Chem Engn & Technol, Tianjin Univ, Tianjin, China

The industrial availability of gas separation membranes relies heavily on membrane permeance, permselectivity and stability, among which the polyether-containing copolymer membranes acquire a desirable balance. However, the condensability- governed separation limits their overall selectivity, which seriously restricts their efficient application in natural gas purification. In the present study, a facile method, inspired by mussel adhesive phenomenon, was developed to enhance the size-sieving ability of the polymer membranes. Dopamine and ferric ion were incorporated into the polymer solution of Pebax® 1657, and the corresponding composite hollow fiber membrane was prepared through the conventional dip-coating method. Compared with the pristine Pebax membrane, the hybrid membranes exhibit significant increase in CO2/CH4 selectivity (from 22 to 75), owing to the increased chain rigidity arising from iron-induced dopamine oxidation and crosslinking. The size-sieving ability of the membranes can be tailored by simply tuning the iron/dopamine ratio. On the other hand, the CO2 permeance remains rather high due to the well-controlled free volume properties. Such a bio-inspired method may pave a versatile way to the rational design of the size-selective membranes for diverse applications.

Extended Abstract: File Not Uploaded
See more of this Session: Poster Session: Interfacial Phenomena
See more of this Group/Topical: Engineering Sciences and Fundamentals