Preparation And Application Of Functional Super-wetting Materials Based On Oil/dye Wastewater Treatmen

With the accelerating process of industrial and agricultural production,the impact of complex sewage system mainly represented by oil-water mixture on the environment is also intensified.Therefore,separation and purification of sewage is of great significance to environmental protection.With the continuous research on the nature of infiltration in nature,super-infiltrating materials with excellent liquid selectivity have been designed,which can realize the separation of complex liquid phase efficiently,rapidly and energy-saving by filtration or adsorption.However,faced with the huge complex mixing system,the treatment effect of traditional special wettable materials is increasingly weak.The purpose of this paper is to prepare functional super-wettable materials loyal to the concept of simplicity,environmental protection and low cost.By adjusting the morphology and composition of the materials,we can construct superhydrophilic/underwater super-hydrophobic film separation materials,so as to separate oil from water and emulsion,and even effectively deal with water-soluble pollutants mainly dye based on this basis.The main work is as follows:(1)Preparation of efficient,energy-saving and stable superwetting material toward multi-typed oil/water mixture system.Adopting a super adhesive as a binder,an extremely thin candle soot(CS)coating was tightly anchored on the microscale wire substrate to prepare the interconnected and highly hydrophobic carbon nanoparticles coated mesh.The mesh not only achieves a variety of oil-water separation and is resistant to harsh environmental conditions,including acid,alkali and salt solutions,and even ultrasonic wear,resulting in excellent structural stability and durability.After20 cycles of separation tests,the mesh still maintained good separation performance and high hydrophobicity,showing excellent reusability and durability.(2)Construction of superwetting material for efficient separation of stable emulsion system rich in multi-form oils.Porous hydrophilic mesh with micro/nano composite structure was in situ constructed by a simple hydrothermal method.In comparison with physical composite between the substrate and modified materials by super adhesive or other binders,the as-prepared mesh behaved only good structural stability,but also high mechanical stability,which can realize the efficient separation of emulsion(oil-in-water emulsion,oil-in-water emulsion).(3)Fabrication of multifunctional superwetting material with oil/water separation,catalytic reduction of organic dyes and anti-bacterial property towards the real complex sewage system.Ag/Cu bimetallic mesh was successfully prepared by alkaline etching,calcination reduction and replacement.In the proof-of-concept experiments,the composite mesh showed excellent separation efficiency and high permeation flux of various oil/water mixtures driven solely by gravity,concurrently achieving catalytic degradation of water-soluble dyes and organic.Besides,this mesh presented excellent anti-bacterial activity against Escherichia coli.As such,the material provides potential applications in multifunctional water purification.