Fig. 1

The set-up for oil-water separation using NPS coated superhydrophobic cotton filters (image created with Adobe photoshop Version 2019 https://www.adobe.com/products/photoshop.html).

The set-up for oil-water separation using NPS coated superhydrophobic cotton filters (image created with Adobe photoshop Version 2019 https://www.adobe.com/products/photoshop.html).