PDMS coated stainless-steel mesh for the removal of microplastics
Researchers have designed a superhydrophobic 304 stainless steel mesh to capture microplastics. The microplastics separation can be explained from a colloid point of view.
The use of microplastics is a global issue that affects the environment, the economy and human health. Scientists now describe a superhydrophobic 304 stainless steel obtained by combining chemical etching and PDMS modification. Among other techniques, field emission scanning electron microscopy (FE-SEM) and high-resolution X-ray photoelectron spectroscopy (HR-XPS) were used to identify the hierarchical structure as well as the chemical composition of the surface. The stainless-steel mesh was superhydrophobic (159°) and superoleophilic (0°).
Removing high-density polyethylene microplastics from water
The coating presented high stability against abrasion of SiC abrasive paper as well as in the presence of different pH values in acidic or alkaline conditions. In addition, taking advantage of the coating’s wetting properties, the reseachers have shown that the superhydrophobic surface can also be used to remove high-density polyethylene microplastics from water. A surface mechanism promoting the removal of microplastics is also proposed, considering the surface properties of the solid pollutants as well as the wetting properties of the superhydrophobic coating.
The study has been published in Progress in Organic Coatings, Volume 170, September 2022.
