Microplastics are
a global issue that affects the environment,
economy, as well as human health. Herein, we present a superhydrophobic
304 stainless steel mesh obtained by chemical etching followed by
a liquid-phase deposition of lauric acid that can be used for microplastic
removal. Field emission scanning electron microscopy (FE-SEM) and
high-resolution X-ray photoelectron spectroscopy (HR-XPS), among other
techniques, were used to identify the hierarchical structure and chemical
composition of the surface. They revealed that iron laurate decreased
the surface free energy. The 304 stainless steel mesh was superhydrophobic
(169°) and superoleophilic (0°). Taking advantage of these
wetting properties, we showed an innovative use of these superhydrophobic
surfaces in the removal of microplastics. Additionally, we analyzed
the removal efficiency from a surface and colloidal point of view
that allowed us to explain and clarify why microplastics can also
be removed by their wetting properties. The loss of a double electrostatic
cloud between the microplastics and the predominance of van der Waals
interactions in the organic phase promote the removal of these persistent
pollutants from water.
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