Hydrotalcite-like nanosheet modified separation membrane as well as preparation method and application thereof
A technology of hydrotalcite and nanosheets, applied in the field of membrane separation, can solve problems such as water environmental pollution, loss of hydrophilic polymers, poor stability of hydrophilic polymers, etc.
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[0020] In a more specific embodiment, the preparation method of the hydrotalcite-like nanosheet modified separation membrane of the present invention comprises the following steps:
[0021] Step 1: Synthesis of hydrotalcite-like particles. Hydrotalcite-like particles can be synthesized by traditional co-precipitation method, hydrothermal method, solvothermal method, urea method and other methods. The synthesized hydrotalcite-like particles are washed with deionized water to pH = 7, fully washed with organic solvents such as acetone, methanol, or ethanol, and dried before use.
[0022] The second step: the preparation of the hydrotalcite-like stripping solution and the casting solution. A hydrotalcite-like stripping solution of a certain concentration is obtained by dispersing a certain mass of hydrotalcite-like in an organic solvent, stirring and ultrasonic treatment for a period of time. The polymer is added to the stripping solution, and the hydrotalcite-like nanosheet / pol...
Embodiment 1
[0033] The preparation of porous separation membrane, concrete steps are:
[0034] (1) 9.6g Mg(NO 3 ) 2 ·6H 2 O and 4.7g Al(NO 3 ) 3 9H 2 O add 50ml of pure water to prepare a salt solution, add it dropwise to 2.12g NaNO 3 Add 50ml of pure water to the aqueous solution, use 3.4M NaOH to control its pH = 10, stir for 1 hour, then move it into the reaction kettle for 120 degree hydrothermal reaction for 12 hours to obtain MgAl-NO 3 Hydrotalcite-like. Then it was washed with pure water to pH = 7, washed with acetone three times, and then dried at 100°C for use.
[0035] The prepared MgAl-NO 3 The hydrotalcite-like was added to the N-methylpyrrolidone solvent, and the concentrations obtained after stirring were 1, 2, 4, 6g L -1 The hydrotalcite-like stripping fluid, its turbidity changes as figure 1 shown.
[0036] (2) Add hydrophilic sulfonated polysulfone (sPSf) into N-methylpyrrolidone solvent, stir and dissolve and then add polysulfone (PSf) to obtain polysulfone / s...
Embodiment 2
[0044] The preparation of composite membrane, concrete steps are:
[0045] (1) 9.6g Mg(NO 3 ) 2 ·6H 2 O and 4.7g Al(NO 3 ) 3 9H 2 O add 50ml of pure water to prepare a salt solution, add it dropwise to 2.12g NaNO 3 Add 50ml of pure water to the aqueous solution, use 3.4M NaOH to control its pH = 10, stir for 1 hour, then move it into the reaction kettle for 120 degree hydrothermal reaction for 12 hours, to obtain MgAl–NO 3 Hydrotalcite-like. Then it was washed with pure water to pH = 7, washed with acetone three times, and then dried at 100°C for use. A certain amount of MgAl-NO 3 The hydrotalcite-like was added into the N-methylpyrrolidone solvent, and a certain concentration (1, 2, 4 and 6g L -1 ) of hydrotalcite-like stripping fluid.
[0046] (2) Add hydrophilic sulfonated polysulfone (sPSf) into N-methylpyrrolidone solvent, stir and dissolve and then add polysulfone (PSf) to obtain polysulfone / sulfonated polysulfone with a total polymer amount of 12wt%. Casting ...
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