Preparation of oil-water separation mesh membrane and surface wettability conversion method thereof

Abstract

Preparation of an oil-water separation mesh membrane and its surface wettability conversion method are disclosed. The preparation of the separation mesh membrane comprises the following steps: A, a micro-nano structure is constructed on the surface of a metal mesh membrane by an oxidation method; B, the metal mesh membrane with the nicro-nano structure on the surface in the step A is put into an electric furnace to undergo thermo-oxidative treatment in the air atmosphere at the thermo-oxidative treatment temperature of 180-300 DEG C for 3-20 min; and a product is taken out of the electric furnace to obtain a superhydrophilic oleophobic mesh membrane; and C, the superhydrophilic oleophobic mesh membrane prepared in the step B is immersed in an ethanol solution of long-chain alkanoic acid or long-chain alkyl sulfhydryl at room temperature for 1-30 min, the product is taken out of the solution and then washed with ethanol, and finally the product is dried in a drying oven of 50-70 DEG C for 8-20 min so as to obtain the superhydrophobic oleophylic mesh membrane. The superhydrophobic oleophylic mesh membrane undergoes the treatment in the step B and the superhydrophilic oleophobic mesh membrane undergoes treatment in the step C so as to change surface wettability of the mesh membrane. The method is simple to operate, and the prepared mesh membrane material has good separation efficiency. In addition, surface wettability of the mesh membrane can be changed through simple operations.

Description

technical field [0001] The invention belongs to the field of preparation of semipermeable membranes used in separation technology, and in particular relates to the preparation of an oil-water separation omentum whose surface wettability can be changed and its surface wettability change method. Background technique [0002] Economic development and the acceleration of the modernization process have brought many conveniences and comforts to human life, but have also brought about increasingly prominent problems such as energy shortages and environmental pollution. Such as oil polluted water, crude oil spills and discharge of oily wastewater have caused serious harm to the environment. At present, oil-water separation technology has been widely used in petrochemical, sewage treatment, food engineering and other fields. However, the differences in the oil-water mixing state, the oil-water content, and the types of organic matter contained in the oil-water mixture increase the d...

AI Technical Summary

Problems solved by technology

However, due to factors such as the difference in density between water and oil, the viscosity difference of different oils, and the uncertain oil-water ratio in different oil-water mixtures, the above separation materials still have the following disadvantages: First, for oils with a lower density than water, oil Floating on water, water tends to form a barrier between the oil and the surface layer of the superhydrophobic-oleophilic separation material, thereby reducing oil penetration

The second is that oils with relatively high viscosity will adhere to the surface of the omentum material when passing through the omentum structure of the superhydrophobic and lipophilic separation material, destroying the surface structure of the material and reducing the wettability of the material surface, thereby reducing its separation. efficiency, and shorten the service life of the separation omentum

Third, for oil-water mixtures with a high proportion of oil content, the selection of superhydrophobic and lipophilic separation materials to separate oil greatly reduces the separation efficiency of the material

Images