Preparation method of filtering material for adsorbing fluorine ions in water

[0016] A method for preparing a fluoride ion adsorption filter material in water, the method comprising the following steps:

[0017] Step 1. Dissolve 1g of Al-PAM powder in 100ml of deionized water to obtain a flocculant solution with a mass fraction of 1%, and dissolve it with 1% NaOH to adjust the pH value to 10;

[0018] Step 2. Add formaldehyde to the above solution, react in a constant temperature water bath at 50°C for 1h, then slowly add diethylenetriamine (DETA) dropwise, and react for 3h, wherein the molar ratio of formaldehyde, DETA and AM is 3:2:1, Obtain a milky white solution, which is the intermediate graft product Al-PAM-DETA;

[0019] Step 3. Reduce the milky white solution obtained above to 25°C, add NaOH, add carbon disulfide dropwise at a rate of 0.1ml / min for 4 hours, raise the temperature to 55°C, and react for 2 hours, where CS 2 , The molar ratio of DETA and NaOH is 3:1:3; the product solution is obtained;

[0020] Step 4: drop the product solution int

[0027] Step 2. Add formaldehyde to the above solution, react in a constant temperature water bath at 50°C for 1h, then slowly add diethylenetriamine (DETA) dropwise, and react for 3h, wherein the molar ratio of formaldehyde, DETA and AM is 3:1:1, The milky white solution was obtained, which was the intermediate graft product Al-PAM-DETA; the rest of the steps were the same as in Example 1.

[0029] Step 2. Add formaldehyde to the above solution, react in a constant temperature water bath at 50°C for 1h, then slowly add diethylenetriamine (DETA) dropwise, and react for 3h, wherein the molar ratio of formaldehyde, DETA and AM is 1:2:1, The milky white solution was obtained, which was the intermediate graft product Al-PAM-DETA; the rest of the steps were the same as in Example 1.