Multi-functional Ag@NH2-UiO-66/PAES-COOH self-supporting symmetric hybrid membrane for forward osmosis separation

Abstract

Currently, internal concentration polarization (ICP) and surface contamination of conventional thin-film composite membranes have become the main factors hindering the development and application of forward osmosis technology. Herein, the optimized hydrophilic Ag@NH2-UiO-66 with water molecule specific channels and antibacterial property was integrated into the molecular structure of carboxyl-containing poly (aryl ether sulfone) (PAES-COOH) matrix with excellent mechanical properties through precise molecular design, which was further combined with the structure design of support layer free to fabricate a series of Ag@NH2-UiO-66/PAES-COOH self-supporting symmetric hybrid forward osmosis membrane system without ICP. The strong chemical bonding between Ag@NH2-UiO-66 filler and PAES-COOH matrix enabled the two parts to form good interfacial compatibility, which promoted the full play of multiple functionalities of Ag@NH2-UiO-66. In consequence, the Ag@NH2-UiO-66/PAES-COOH self-supporting symmetric hybrid forward osmosis membranes exhibited excellent water permeability (13.78 L m−2 h−1 of the optimal sample) and water-salt selectivity (1724.70 L mol−1 of the optimal sample) effective antibacterial capability, as well as enhanced organic pollution resistance ability. This research provides an effective strategy for the realization of self-supporting symmetric forward osmosis membrane with multiple functionalities, which can be extended to other membrane systems to promote the development of future osmosis technology.