Bionic Construction And Application Of Super-wetting Copper Mesh For Wastewater Treatment

The treatment of oily wastewater is an urgent problem in industrial production and daily life.At present,for this kind of wastewater,the commonly used industrial treatment methods are: physical treatment method,chemical treatment method,biological treatment method and combined treatment method;Among them,the combination of multiple treatment method is the most common one,and can achieve the expected treatment effect.As the commonly used oil-water separation equipment in daily life,grease trap has excellent separation efficiency.This paper mainly aims at the designs of the copper mesh with special wettability to achieve the effect of high oil-water separation efficiency,low pollution degree and good durability.In this paper,from the perspective of treating different types of oil-containing wastewater,through learning from nature,super-hydrophilic and super-hydrophobic copper meshes were prepared,and their comprehensive properties were investigated from macro and micro aspects.Three kinds of super hydrophilic copper mesh were prepared by ammonia alkali corrosion method,silver nitrate replacement method and mercaptoethanol treatment method.Through scanning electron microscope observation,static contact Angle measurement,n-hexane-water mixed solution separation experiment,the surface morphology of three different copper mesh,the size of the contact Angle between air and water,and the changes of separation efficiency after multiple oil and water separation were investigated.The experimental results show that the surface of the copper mesh treated with mercaptoethanol has an obvious micro-nano composite structure,and the contact Angle between air and water is only 11.3°,which has an obvious super-hydrophilic effect.Compared with the other two super-hydrophilic meshes,the stability after multiple oil and water separation is better,which can be used for the separation of alkanes(light)oil and water mixture solution.Trifluoroacetic anhydride and mercaptoethanol are esterified to form thioglycaptoethyl trifluoroacetate.After pretreatment,the copper mesh was soaked in thioglycaptoethyl trifluoroacetate solution for 10 h to obtain the superhydrophobic copper mesh.The surface morphology of copper mesh was scanned by electron microscopy.Low surface energy materials are exposed to theoutermost layer of the copper mesh,which reduces the surface energy of the copper mesh and makes the contact Angle of water on its surface reach 152.8°.The effects of reaction time and solution ratio on the preparation of copper mesh were investigated,and the conclusion is that the reaction time is 10 h and the superhydrophobicity of copper mesh is best when the ratio of trifluoroacetic to mercaptoethanol is 3:1.The separation efficiency of oil and water is 98.5%.The prepared copper mesh has high adhesion property and can be used for selective transfer of droplets.In addition,through the modification of dopamine,electrolytic deposited copper was compounded with amidogen azobenzene at a certain temperature to obtain a low-adhesion surface with superhydrophobic property.Scanning electron microscope was used to observe the surface morphology.It is found that the copper mesh has high separation efficiency and can be used for the separation of halogenated hydrocarbon(heavy)oil-water mixture.In this study,under the existing preparation technology and theoretical support,through different methods to prepare the super-hydrophilic copper network and super-hydrophobic copper network,from the oil-water separation efficiency,surface microstructure and other aspects of the prepared copper network to explore the performance.The results show that the superhydrophilic copper mesh treated with mercaptoethanol has higher oil-water separation efficiency and stable properties.Copper mesh treated with thioglycaptoethyl trifluoroacetate has high oil and water separation efficiency,and has high adhesion property,which can be used as the selective transfer of droplets.In contrast,the copper mesh obtained by aminoazobenzene composite,in addition to oil and water separation,has low adhesion,can use its low rolling Angle,to achieve surface self-cleaning.The copper mesh obtained in the experiment can separate different types of oil-water mixture solutions,providing a new idea for super-hydrophilic,super-hydrophobic and responsive surfaces.