Interplay of the forces governing steroid hormone micropollutant adsorption in vertically-aligned carbon nanotube membrane nanopores

Nguyen, Minh Nhat; Jue, Melinda L.; Buchsbaum, Steven F.; Park, Sei Jin; Vollnhals, Florian; Christiansen, Silke; Fornasiero, Francesco; Schäfer, Andrea Iris

doi:10.1038/s41467-024-44883-2

Title: Interplay of the forces governing steroid hormone micropollutant adsorption in vertically-aligned carbon nanotube membrane nanopores

Journal Article · 06 February 2024 · Nature Communications

DOI: https://doi.org/10.1038/s41467-024-44883-2 · OSTI ID:2325283

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^[2]; Buchsbaum, Steven F. ^[2];

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^[3]; Christiansen, Silke ^[3];

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Karlsruhe Inst. of Technology (KIT) (Germany). Institute for Advanced Membrane Technology (IAMT)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Fraunhofer Institute for Ceramic Technologies and Systems (IKTS), Forcheim (Germany). Institute for Nanotechnology and Correlative Microscopy (INAM)

Vertically-aligned carbon nanotube (VaCNT) membranes allow water to conduct rapidly at low pressures and open up the possibility for water purification and desalination, although the ultralow viscous stress in hydrophobic and low-tortuosity nanopores prevents surface interactions with contaminants. In this experimental investigation, steroid hormone micropollutant adsorption by VaCNT membranes is quantified and explained via the interplay of the hydrodynamic drag and friction forces acting on the hormone, and the adhesive and repulsive forces between the hormone and the inner carbon nanotube wall. It is concluded that a drag force above 2.2 × 10^—3 pN overcomes the friction force resulting in insignificant adsorption, whereas lowering the drag force from 2.2 × 10^—3 to 4.3 × 10^—4 pN increases the adsorbed mass of hormones from zero to 0.4 ng cm^—2. At a low drag force of 1.6 × 10^—3 pN, the adsorbed mass of four hormones is correlated with the hormone–wall adhesive (van der Waals) force. These findings explain micropollutant adsorption in nanopores via the forces acting on the micropollutant along and perpendicular to the flow, which can be exploited for selectivity.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); Defense Threat Reduction Agency (DTRA)

Grant/Contract Number:: AC52-07NA27344; AC02-05CH11231; BA12PHM123

OSTI ID:: 2325283

Report Number(s):: LLNL-JRNL-860971; 1091652

Journal Information:: Nature Communications, Vol. 15, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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