Elucidating the adsorption mechanism of a molecular water pollutant in the organic shell of nanoparticulate water cleaning agents
General access to clean water is a major global challenge. Anthropogenic molecular pollutants, like herbicides or hormones are present in our surface waters due to careless disposal and insufficient remediation. Therefore, it exists a strong demand in affordable and efficient removal of such contaminants from water. We work on superparamagnetic iron oxide nanoparticles (SPIONs) that are decorated with self-assembled monolayers (SAMs) composed of permanently binding phosphonic acid derivates to address certain interaction motifs of surrogate pollutants (e.g. hormone 17-beta estradiol). Such particles attract the pollutants and can be easily remediated from water by an external magnetic field. We envision sorbent systems that are not only thermodynamically attractive for the pollutants of choice, but also present suitably-sized nano-cavities in the binary SAM. Understanding how the pollutant actually adsorbs "in or on" the cavity-enriched SAM is an experimentally challenging task, for which SANS with contrast variation is one of the few available techniques. Elucidating the adsorption mechanism would benefit the improvement of design for such water cleaning agents.
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MUELLER Lukas; HALIK Marcus; MUELLER Wenke and SCHWEINS Ralf. (2023). Elucidating the adsorption mechanism of a molecular water pollutant in the organic shell of nanoparticulate water cleaning agents. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-698
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