Recent developments in usage of fluorine-free nano structured materials in oil-water separation: A review

In recent years, significant oil spills and organic solvent contamination are harming ocean habitats and endangering aquatic species. Separating the toxic oil substances from water using a type of coating that is sustainable and easily safe is the main aim of researchers. The superhydrophobic coating without flourine is the alternative approach that is being developed since several years as fluorine is harmful to nature. It resulted in substantial endeavors in constructing a substance with a higher oil adsorption power, a straightforward implementation in oil-water segregation, and excellent stability in oil-water with outstanding recycling. The two main aspects while fabricating a superhydrophobic coating on a substrate are wettability and the oil-water separation performance. The whole analysis summarizes the material for oil-water segregation in recent times which are sustainable, including their adsorption performance and filtering, and has manoeuvrable wettable segregation technology. The chemical element fluorine is one of the microelements needed to develop living organisms when absorbed in tiny quantities properly and it is toxic when present in an excessive amount. Fluorine is considered an environmental pollutant with adverse effects in people and animals on diverse organisms. Fluoride elements in living organism functions as an enzyme poison that inhibits enzyme activity and eventually breaks down critical metabolic functions. However, most of the techniques documented so far include high prices or complex procedures and severe environments, limiting the processing of flexible substrates. Therefore, easy, quick, low-cost, environmentally friendly methods for hydrophobic surfaces having controlled morphology continue to be developed to extend their industrial uses. We report herein on the production of hydrophobic coatings based chiefly on the deposition of biocompatibility products with various nanoparticles to overcome this gap and meet the green requirements. Consequently, this fabrication process has been thought to be necessary, practical, and achievable for the manufacturing of superhydrophobic surfaces for use in commercial processes. This review paper also mentions the simple hypothesis that has already developed which would help to understand the surface-specific wettability.