Study On The Preparation Of Metal Based Superhydrophobic Meshes And The Performance Of Oil/Water Separation

With the development of the industry,oil exploitation and utilization has become an indispensable part of people,however,serious water pollution problems caused by this situation has always been a big problem of contemporary scientific research.As a result,a large number of studies on how to efficiently,economically,and continuously separate oil and water was carried out.At present,the treatment of oily wastewater mainly includes: gravity separation,air flotation,oil absorption.In the process,there are many problems,such as low efficiency and high cost.With the development of special surface wettability of materials,superhydrophobic materials,superoleophobic materials and superamphiphobic materials were used to realize the separeation of oil and water.The cheap cost,simple preparation process and high oil-water separation efficiency of these materials make them become an emphasis in this field.In this paper,the preparation,characterization and oil-water separation of superhydrophobic film by FAS grafting Ni-P electroless plating on stainless steel wire mesh were investigated.Main results are as follows:?1?Based on the method of electroless Ni-P,the micro-nanostructures were fabricated on the surface of stainless steel,and then the superhydrophobic stainless steel wire mesh was prepared by modifying the low-surface energy of the trioxymethylsiloxane.The effects of Ni-P electroless plating solution on the surface morphology,contact angle and oil-water separation performance were studied by XRD,SEM,EDS and contact angle measurements.The results indicated that a layer of Ni-P coating on stainless steel mesh surface was formed after Ni-P electroless plating,and the Ni-P coating layer consisted of spherical particles connected each other.At the optimum parameters of preparation,the contact angle of the superhydrophobic stainless steel wire mesh reached 167.9±2.1°.?2?The superhydrophobic surface was prepared by electroless plating of Ni-P-nano ZrO₂ on stainless steel wire mesh surface,and the superhydrophobic surface was characterized by SEM,EDS and water contact angle measurement.The results show that the surface of stainless steel wire was constructed by compact Ni-P-nano ZrO₂ coating with micro-nano structure and nano-Nano roughness rough structure.The interaction of this kind of structure and surface hydrophobicity of Ni-P makes the surface appear super hydrophobic properties.?3?The corrosion resistance of electroless Ni-P-nano ZrO₂ stainless steel wire mesh was simulated by the simulated geothermal water.The result indicates that the hydrophobic mesh coating prepared with NiCl₂·6H2O as main salt has better corrosion resistance performance?4?The separation of diesel oil and water mixture was carried out by using a gravity system designed by self.The experimental results show that the oil and water separation efficiency of 96.8% can be reached by the super hydrophobic stainless steel wire mesh surface prepared under the conditions: NiSO4·6H2O concentration 50 g/L,C3H6O3 concentration 20mg/L,Na3C6H5O7·2H2O concentration 40g/L,C2H3O₂ Na concentration 40g/L,NaH2PO₂ concentration 40g/L,and the separation efficiency can reach more than 95% after using 30 times.