Preparation method and application of amidoxime-modified para-aramid adsorption material
A technology based on para-aramid and amidoxime, which is applied in the field of preparation of adsorption materials, can solve the problems of poor metal ion chelation performance, practical application limitations, and small adsorption capacity, and achieve large adsorption capacity of metal ions and long-term reduction Pollution, improve the effect of comprehensive utilization
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[0024] The preparation method of the para-aramid adsorption material modified by amidoxime group comprises the following steps:
[0025] 1) Wash the para-aramid powder with toluene, acetone, and deionized water for 3-6 hours respectively, and then vacuum-dry it at 60°C to obtain pretreated para-aramid powder;
[0026] 2) Under the protection of nitrogen, mix sodium hydride and anhydrous dimethyl sulfoxide at a molar ratio of 1:125, stir mechanically, wait until the temperature rises to 70°C, continue the reaction for 40-60min, then cool down to 30°C, to obtain a mixed solution;
[0027] 3) Slowly add the pretreated para-aramid powder obtained in step 1) to the mixed solution obtained by the reaction in step 2) several times, the amide bond in the aramid powder and the mole of sodium hydride The ratio is 1:1, the reaction is at 25-40°C for 16-72h, and an orange-red solution is obtained; the temperature is raised to 50°C, and redistilled acrylonitrile is slowly dropped into the...
Embodiment 1
[0031] 1) Wash the waste para-aramid powder with toluene, acetone, and deionized water in sequence for 3 hours, and then vacuum-dry it at 60°C to obtain pretreated para-aramid powder;
[0032] 2) After purging the dry 250mL three-necked flask with nitrogen for 10min, at 30°C, add 0.4034g of sodium hydride (0.017mol) and 150mL of anhydrous dimethyl sulfoxide (2.112mol), stir mechanically, and heat up to 70°C, keep warm for 40min, then cool down to 30°C to obtain a mixed solution;
[0033] 3) Slowly add 2 g of the pretreated para-aramid powder obtained in step 1) to the mixed solution obtained in step 2), and mechanically stir at 30° C. for 48 hours to obtain an orange-red solution; raise the temperature to 50° C. 11 mL of redistilled acrylonitrile (0.168 mol) was slowly dropped into the orange-red solution, and the reaction was continued for 16 hours to obtain a purple-red solution;
[0034] 4) Add 500mL of 0.1mol / L dilute hydrochloric acid to the purple-red solution obtained ...
Embodiment 2
[0037] 1) Wash the waste para-aramid powder with toluene, acetone, and deionized water for 6 hours, and then vacuum-dry it at 60°C to obtain pretreated para-aramid powder;
[0038] 2) After purging the dry 250mL three-necked flask with nitrogen for 10min, at 30°C, add 0.4034g of sodium hydride (0.017mol) and 150mL of anhydrous dimethyl sulfoxide (2.112mol), stir mechanically, and heat up to 70°C, keep warm for 60min, then cool down to 30°C to obtain a mixed solution;
[0039] 3) Slowly add 2 g of the pretreated para-aramid powder obtained in step 1) to the mixed solution in step 2), and mechanically stir for 72 hours at 25° C. to obtain an orange-red solution; raise the temperature to 50° C. Slowly drop 33 mL of redistilled acrylonitrile (0.504 mol) into the orange-red solution, and continue the reaction at 50°C for 16 hours to obtain a purple-red solution;
[0040] 4) Add 700 mL of 0.1 mol / L dilute hydrochloric acid to the purple-red solution obtained in step 3), precipitate...
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