A preparation method of an inorganic film for repairing surface defects of a carrier
A carrier surface and defect technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as unfavorable flat surface, rough carrier surface, defects, etc., and achieve the effect of low price
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[0042] A method for preparing an inorganic film for repairing surface defects of a carrier, comprising the following steps:
[0043] 1) dispersing graphene oxide in different concentrations in aqueous solution;
[0044] 2) adding a certain concentration of surfactant to the graphene oxide aqueous solution;
[0045] 3) Utilize the dip coating method to prepare the graphene oxide film on the defects on the rough carrier surface;
[0046] 4) Thermal reduction curing of the coating;
[0047] 5) Prepare an inorganic membrane on the repaired carrier by physical and chemical methods.
Embodiment 1
[0049] A 0.5 mg / mL graphene oxide aqueous solution and a 5 mmol / L cetyltrimethylammonium bromide solution were used to modify the surface of the porous stainless steel support. In this embodiment, graphene oxide is prepared by using the Hummers method.
[0050] Add 24mg of graphene oxide and 108mg of 1,4-benzenediboronic acid into 45mL of methanol solvent (the mass ratio of graphene oxide and 1,4-benzenediboronic acid is 1:5), at 90°C and 1000rpm For solvothermal reaction 60h. At room temperature, centrifuge at 10,000 rpm for 20 minutes to remove the supernatant; add a certain amount of methanol to the precipitate, and use a sonicator to sonicate for 10 minutes, and centrifuge the sonicated solution under the same conditions as before to obtain the precipitate And adding methanol, ultrasonic crushing and other operations cycled three times. The obtained precipitate was dried in a vacuum oven at 45°C. The precipitate was dissolved in deionized water to prepare a 0.5 mg / mL gr...
Embodiment 2
[0054] A 0.5 mg / mL graphene oxide aqueous solution and a 0.05 mmol / L cetyltrimethylammonium bromide solution were used to modify the surface of the porous stainless steel carrier. In this example, graphene oxide was prepared by the Brodie method.
[0055] The difference from Example 1 is that the concentration of the surfactant cetyltrimethylammonium bromide is 0.05mmol / L. All the other steps are the same as in Example 1.
[0056] figure 2 It is a scanning electron micrograph of the graphene oxide film formed on the porous stainless steel surface modified by this method. It can be seen that the pores on the surface of the porous stainless steel are partially covered with a layer of graphene oxide film, and the surface defects of the porous stainless steel are modified.
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