Two-Dimensional Covalent Triazine Framework Membrane for Helium Separation and Hydrogen Purification

Abstract

Ultrathin membranes with intrinsic pores are highly desirable for gas separation applications, because of their controllable pore sizes and homogeneous pore distribution and their intrinsic capacity for high flux. Two-dimensional (2D) covalent organic frameworks (COFs) with layered structures have periodically distributed uniform pores and can be exfoliated into ultrathin nanosheets. As a representative of 2D COFs, a monolayer triazine-based CTF-0 membrane is proposed in this work for effective separation of helium and purification of hydrogen on the basis of first-principles calculations. With the aid of diffusion barrier calculations, it was found that a monolayer CTF-0 membrane can exhibit exceptionally high He and H2 selectivities over Ne, CO2, Ar, N2, CO, and CH4, and the He and H2 permeances are excellent at appropriate temperatures, superior to those of conventional carbon and silica membranes. These observations demonstrate that a monolayer CTF-0 membrane may be potentially useful for helium separation and hydrogen purification.

Bioinspired Synthesis of Cu2+‐Modified Covalent Triazine Framework: A New Highly Efficient and Promising Peroxidase Mimic

“…[24] CTFs have found various applicationss uch as catalysts for the electrochemical oxygen reduction reaction, [25] catalyst carriers, [26] gas separation and purification, [27] and others, [28][29][30] however,t oo ur knowledge,t hey have not been effectively ex-plored as enzyme mimics so far.Incomparison with the reported nanomaterial, CTFs may be as uperior material for the construction of peroxidase mimics. [24] CTFs have found various applicationss uch as catalysts for the electrochemical oxygen reduction reaction, [25] catalyst carriers, [26] gas separation and purification, [27] and others, [28][29][30] however,t oo ur knowledge,t hey have not been effectively ex-plored as enzyme mimics so far.Incomparison with the reported nanomaterial, CTFs may be as uperior material for the construction of peroxidase mimics.…”

Wave Packet Calculations of the Quantum Transport of Atoms through Nanoporous Membranes

“…In addition, f tunn (T ) is a correction for tunneling effects along the reaction path. 22,42,43 Finally, γ is a correction factor (not considered previously) related to the fact that only a fraction of the membrane is effective for permeation 44 and is defined as…”

Microporous Organic Materials for Membrane‐Based Gas Separation

“…Li and co‐workers predicted that 2D covalent‐triazine‐framework membranes (CTF‐0) with uniform and ultrasmall pores could work effectively for helium separation. From first‐principles calculations, it was found that a monolayer CTF‐0 membrane could exhibit unprecedentedly high helium selectivity over other permanent gases …”