Charge gradient hydrogel membrane for thermal seawater desalination and preparation method thereof
A hydrogel membrane, hydrogel technology, applied in chemical instruments and methods, seawater treatment, water/sewage treatment, etc., can solve the problems of water production rate and anti-pollution stability that cannot be taken into account at the same time.
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[0019] Such as figure 1 As shown, the present invention also proposes a method for preparing a charge gradient hydrogel membrane for thermal seawater desalination, which can be used to prepare the above-mentioned charge gradient hydrogel membrane, comprising the following steps:
[0020] S1, preparing two hydrogel prepolymer membranes with different charge concentrations;
[0021] S2, after the two membranes are closely attached, they are placed in an oxygen-free environment for chemical crosslinking. At the same time, the charge diffuses from the high concentration end to the low concentration end to form a hydrogel film with a continuous gradient distribution of charge concentration.
[0022] Specifically, the charges can be all positive charges or all negative charges; one of the hydrogel prepolymer membranes can be uncharged and the other one can be charged, or both membranes can be charged but have different charge concentrations. The two hydrogel films are placed in an ...
Embodiment 1
[0036] S101, mix acrylamide and sodium 2-acrylamido-2-methyl-1-propanesulfonate at a molar ratio of 1:1 and 1:0.1, respectively, and dissolve them in a certain volume of water to prepare two monomers The monomer solution with a concentration of 3mol / L; then add the same proportion of ammonium persulfate as an initiator to the two monomer solutions, the initiator is a thermal initiator, and N, N-methylenebisacrylamide is used as an exchange Linking agent, nanoclay as thickener; Wherein, the molar ratio of monomer and initiator is 1:0.01; The molar ratio of monomer and crosslinking agent is 1:0.01; The molar ratio of monomer and thickener is 1 : 0.2; Finally fully stirred to obtain a uniformly dispersed hydrogel prepolymer solution;
[0037] S102. Pour the prepared two parts of hydrogel prepolymer solutions into two sealed glass molds with a thickness of 100 μm, and let them stand in a refrigerator at 7°C for 30 minutes. The nanoclay increases the viscosity of the monomer soluti...
Embodiment 2
[0042] S101, mix acrylamide and 3-acrylamidopropyl-trimethylammonium chloride at a molar ratio of 1:1 and 1:0.1, respectively, and dissolve them in a certain volume of water to prepare two monomers with a concentration of 3mol. / L monomer solution; then add the same proportion of potassium persulfate as an initiator to the two monomer solutions, this initiator is a thermal initiator, N, N-methylene bisacrylamide as a crosslinking agent, nano Clay is used as a thickener; wherein, the molar ratio of the monomer to the initiator is 1:0.01; the molar ratio of the monomer to the crosslinking agent is 1:0.01; the molar ratio of the monomer to the thickener is 1:0.2; finally Thoroughly stir to obtain a uniformly dispersed hydrogel prepolymer solution;
[0043] S102. Pour the prepared two parts of hydrogel prepolymer solutions into two sealed glass molds with a thickness of 20 μm respectively, and let them stand in a refrigerator at 7° C. for 30 minutes. The nanoclay increases the vis...
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Abstract
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