Method for preparing alumina ceramic membrance by ion exchange
A technology of alumina ceramic membrane and ion exchange method, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. It can solve the problems that ions are difficult to remove and cannot obtain a continuous and complete alumina film layer, and achieve pore size distribution. Narrow, large specific surface area effect
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[0007] Example 1.
[0008] (1) Put a certain amount of AlCl 3 ·6H 2 O (Analytical Pure) is made into AlCl with a concentration of 1M 3 The solution is ready for use;
[0009] (2) Take 150ml of the above solution, add the regenerated 717 styrene anion exchange resin (Hefei University of Technology) to the AlCl batch by batch under the conditions of room temperature and magnetic stirring. 3 In solution
[0010] (3) Use AgNO after adding resin 3 Solution detection of Cl in solution - Ion until Cl is not detected - After ionization, separate the resin from the obtained sol;
[0011] (4) After transferring the obtained sol to a water bath at 80°C for aging for 4 hours, adjust the pH value of the sol to about 3.7 with nitric acid, and continue to reflux in a water bath at 80°C for 12 hours to obtain a clear aluminum sol;
[0012] (5) Mix the prepared sol with a 3% PVA aqueous solution in a ratio of 1:1, and use the method of filtering to form a film on the alumina hollow fiber. The coat...
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[0014] Example 2.
[0015] Following the steps in Example 1, the sol was prepared, coated, dried, and heat-treated. The difference is that the aging time is 16 hours. The surface of the hollow fiber supported membrane is continuous and complete, and the crystal phase of the ceramic membrane is γ-Al 2 O 3 Crystal state, specific surface area is 176.9m 2 / g, the most accessible pore diameter is 3.65nm, the pore volume is 0.184ml / g, and it has a certain gas selectivity. 2 / H 2 The separation factor of is 2.80, and the gas passing through the membrane is controlled by Knudsen diffusion.
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