Underoil superhydrophilic flame-retardant 3D porous composite for efficient on-demand emulsion separation:Interface engineering design on sphagnum moss  

作　　者：Yuyan GUO Peng LIU Wenhao ZHANG Zhiguang GUO Weimin LIU 

机构地区：[1]Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials,Hubei University,Wuhan 430062,China [2]State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou730000,China

出　　处：《Friction》2024年第10期2222-2240,共19页摩擦（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51735013).

摘　　要：Oil pollution and the energy crisis make oil-water separation an urgent for human need.The widespread use of materials with a single emulsion separation capability is limited.Multifunctional on-demand separation materials can adapt to a wide range of application scenarios,thus having a wider range of applications.The underoil superhydrophilic surface is of great significance for realizing the on-demand separation of oil/water emulsions through the removal of water in the oil and oil in the water.A 3D porous emulsion separation material based on the superhydrophilic principle of sphagnum moss was designed.The material was prepared in a simple step by taking advantage of the adhesion of polydopamine and the introduction of the as-prepared superhydrophilic BaSO4 nanoparticles to achieve superhydrophilicity with a water contact angle(WCA)of 0°and an oil contact angle(OCA)of 157.3°,resulting in excellent separation performance for both water-in-oil and oil-in-water emulsions.Underoil superhydrophilic porous composite(OSPC)can complete two kinds of emulsion separations by filtration or adsorption.It adsorbs water from water-in-oil emulsion to achieve separation,with a good adsorption capacity of 74.38 g/g and efficiency up to 99%.It can also filter oil-in-water emulsions with an efficiency of 99.92%.The separation efficiencies are all almost unchanged after ten separation cycles.Furthermore,the material has excellent flame retardancy,which reduces the possibility of secondary disasters.The three-dimensional porous sponge has excellent on-demand separation performance for multiple emulsions.It provides a new preparation strategy for underoil superhydrophilic materials and a new idea for the design direction of special wetting materials for the on-demand separation of oil/water emulsions.

关 键 词：on-demand emulsion separation porous absorption filtration underoil hydrophilicity superwettability 

分 类 号：TH117[机械工程—机械设计及理论]