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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 14: 2D Materials
CPP 14.5: Talk
Monday, March 18, 2024, 17:15–17:30, H 0111
Defect-Healed Carbon Nanomembranes for Enhanced Salt Separation: Scalable Synthesis and Performance — •Zhen Yao1, Pengfei Li1,2, Kuo Chen1,2, Yang Yang1, André Beyer1, Qingshan Niu3, and Armin Gölzhäuser1 — 1Bielefeld University, 33615 Bielefeld, Germany — 2China University of Petroleum (East China), Qingdao 266580, PR China — 3Shenzhen University, Shenzhen 518060, PR China
Carbon nanomembranes (CNMs), featuring a high density of sub-nanometer channels, enable superior salt separation performance compared to conventional membranes. However, defect occurrence during synthesis and transfer processes impedes their technical realization on a macroscopic scale. Here, we introduce a practical and scalable interfacial polymerization method to effectively heal defects while preserving the sub-nanometer pores within CNMs. The defect-healed CNMs exhibit exceptional performance in forward osmosis (FO), achieving a water flux of 105 L m-2 h-1 when measured with 1M NaCl as draw solution. This water flux is ten times higher than commercially available FO membranes. Through successful implementation of the defect-healing method and support optimization, we demonstrate the scalable synthesis of fully functional, centimeter-scale CNM-based composite membranes, showing a water permeance comparable to commercial membranes and a salt rejection of ~99.8%. Our defect-healing method presents a promising pathway to overcome limitations in CNM synthesis, unlocking their potentials for practical salt separation applications.
Keywords: Carbon nanomembranes; Water filtrations; Forward osmosis