Premium
Effective Separation of CO 2 Using Metal‐Incorporated rGO Membranes
Author(s) -
Jin Xiaoheng,
Foller Tobias,
Wen Xinyue,
Ghasemian Mohammad B.,
Wang Fei,
Zhang Mingwei,
Bustamante Heriberto,
Sahajwalla Veena,
Kumar Priyank,
Kim Hangyel,
Lee GwanHyoung,
KalantarZadeh Kourosh,
Joshi Rakesh
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201907580
Subject(s) - graphene , materials science , membrane , oxide , gas separation , selectivity , permeation , chemical engineering , graphene oxide paper , molecule , intercalation (chemistry) , adsorption , nanotechnology , inorganic chemistry , chemistry , organic chemistry , catalysis , biochemistry , engineering , metallurgy
Graphene‐based materials, primarily graphene oxide (GO), have shown excellent separation and purification characteristics. Precise molecular sieving is potentially possible using graphene oxide‐based membranes, if the porosity can be matched with the kinetic diameters of the gas molecules, which is possible via the tuning of graphene oxide interlayer spacing to take advantage of gas species interactions with graphene oxide channels. Here, highly effective separation of gases from their mixtures by using uniquely tailored porosity in mildly reduced graphene oxide (rGO) based membranes is reported. The gas permeation experiments, adsorption measurement, and density functional theory calculations show that this membrane preparation method allows tuning the selectivity for targeted molecules via the intercalation of specific transition metal ions. In particular, rGO membranes intercalated with Fe ions that offer ordered porosity, show excellent reproducible N 2 /CO 2 selectivity of ≈97 at 110 mbar, which is an unprecedented value for graphene‐based membranes. By exploring the impact of Fe intercalated rGO membranes, it is revealed that the increasing transmembrane pressure leads to a transition of N 2 diffusion mode from Maxwell–Stefan type to Knudsen type. This study will lead to new avenues for the applications of graphene for efficiently separating CO 2 from N 2 and other gases.