Preparation method of magnetic composite adsorbing material for Antarctic krill protein enzymolysis solution defluorination
The technology of composite adsorption material and protease hydrolyzate is applied in the field of preparation of composite adsorption material, which can solve the problems of difficulty in post-processing and increase the difficulty of separation of adsorbents, and achieves convenient separation, convenient separation, recovery and regeneration, and fluorine removal effect. excellent effect
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Embodiment 1
[0019] 1. Weigh a certain mass of Fe 3 o 4 , slowly added to the concentration of 1.85wt% chitosan acetic acid solution (2wt%), Fe 3 o 4 The quality of: the volume of chitosan acetic acid solution is controlled at 13:1, unit g / L, then with the supersonic wave (frequency 120kHz) ultrasonic dispersion 30min of 300 watts;
[0020] 2. Add the above solution to 0.65 times the volume of Ca(NO 3 ) 2 solution, and stirred at 65°C for 20min;
[0021] 3. Under the condition of keeping stirring, use a constant flow pump to slowly drop the above solution into 0.24 times the volume of (NH 4 ) 2 HPO 4 In the solution, the molar ratio of Ca / P was kept at 1.62, during which the pH was adjusted with ammonia water to keep the value at 10, the stirring time continued for 2 hours, and then stood at room temperature for 26 hours;
[0022] 4. Vacuum filter the solution after standing, and repeatedly wash the solid matter with deionized water and absolute ethanol until neutral, then vacuum-d...
Embodiment 2
[0024] 1. Weigh a certain mass of Fe 3 o 4 , slowly added to the concentration of 1.90wt% chitosan acetic acid solution (2wt%), Fe 3 o 4 The quality of: the volume of chitosan acetic acid solution is controlled at 12:1, unit g / L, then with the supersonic wave (frequency 80kHz) ultrasonic dispersion 25min of 400 watts;
[0025] 2. Add the above solution to 0.70 times the volume of Ca(NO 3 ) 2 solution, and stirred at 70 ° C for 15 min;
[0026] 3. Under the condition of keeping stirring, use a constant flow pump to slowly drop the above solution into 0.25 times the volume of (NH 4 ) 2 HPO 4 In the solution, the molar ratio of Ca / P was kept at 1.64, during which the pH was adjusted with ammonia water to keep the value between 11, the stirring time continued for 2.5h, and then stood at room temperature for 28h;
[0027] 4. Vacuum filter the solution after standing, and wash the solid matter repeatedly with deionized water and absolute ethanol to neutrality, then vacuum-dr...
Embodiment 3
[0029] 1. Weigh a certain mass of Fe 3 o 4 , slowly added to the concentration of 1.95wt% chitosan acetic acid solution (2wt%), Fe 3 o 4 The quality: the volume of chitosan acetic acid solution is controlled at 11:1, unit g / L, then with the supersonic wave (frequency 70kHz) ultrasonic dispersion 30min of 500 watts;
[0030] 2. Add the above solution to 0.75 times the volume of Ca(NO 3 ) 2 solution, and stirred at 75 ° C for 10 min;
[0031]3. Under the condition of keeping stirring, use a constant flow pump to slowly drop the above solution into 0.16 times the volume of (NH 4 ) 2 HPO 4 In the solution, the molar ratio of Ca / P was kept at 1.65, during which the pH was adjusted with ammonia water to keep the value at 10, the stirring time continued for 3 hours, and then stood at room temperature for 30 hours;
[0032] 4. Vacuum filter the solution after standing, and wash the solid matter repeatedly with deionized water and absolute ethanol to neutrality, then vacuum-dry...
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