Electrostatic Effect Eliminated Graphene Oxide Framework Membrane Induced via In-situ Interfacial Polymerization for Efficient Antibiotic Desalination

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Abstract
Membrane technology holds significant promise in the antibiotics desalination. However, its practical application is constrained by the limited controllability over membrane microstructures, including pore architecture and surface charge distribution. This study proposed a two-dimensional (2D) confined interfacial polymerization (IP) strategy to address the manipulability of the nanochannel morphology and the charge distribution for fabricating membrane with high performance of antibiotic desalination. The polyethyleneimine(PEI)-grafted amino-functionalized GO nanosheets were used as building blocks to construct ultra-thin 2D nanochannel membranes, further introduction of trimesoyl chloride (TMC) triggered the interface polymerization (IP) reaction within the confined space, which not only repairs the defects but also precisely regulates the charge distribution within the nanochannels. The optimized ultra-thin (only 48.6 nm thick) membrane existed more orderly interlayer channels and a nearly neutral charge distribution. These structural advantages yielded an unexpected antibiotics desalination performance with a water permeance of 176.2 L m-2 h-1 bar-1 and NaCl/tetracycline (TC) selectivity of 75.7 under the synergy of the enhanced size sieving and the eliminated electrostatic exclusion effect. Furthermore, this membrane demonstrated outstanding long-term stability. This study provides a scientific reference for developing high-performance membrane towards pharmaceutical industry and water purification.

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