A biomimetic durable superhydrophobic 3D porous composite with flame retardant for multi-environment adsorption emulsion separation

Abstract

Selective adsorption materials with durability and flame retardancy have always been a research hotspot. To endow the melamine sponge with the ability of selective adsorption, it is necessary to endow the sponge with superhydrophobic properties. Here, using the means of mussel biomimetic chemistry, durable flame-retardant selective adsorbents were prepared by growing PPy, PDA, and SiO2 on the surface, and modified by siloxane to achieve superhydrophobicity. The material has good adsorption capacity for organic solutions and oils. Each gram of sponge can absorb 18–39 g of organic solvents and can also stably and efficiently separate a variety of oil-in-water emulsions, with a maximum separation efficiency of 99.78%. More importantly, the sponge has good mechanical and chemical stability, which can stably purify water pollution in harsh environments. At the same time, it has good thermal stability and flame retardancy to ensure safe work in high temperature environments. Compared with other superhydrophobic fabrics, SPC has good chemical, mechanical stability and durability, and more importantly, SPC has flame retardancy, which can be used more safely in complex marine pollution environments.