Preparation method of aminated magnetic nanocrystalline cellulose
A technology of nanocrystalline cellulose and sodium carboxymethyl cellulose, which is applied in the field of preparation of aminated magnetic nanocrystalline cellulose, can solve the problems of long self-polymerization reaction time, limited hydrophilicity, uneven adhesion, etc., and achieve improved The sexual process is easy to control, the reaction conditions are easy to control, and the effect of mild reaction conditions
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Embodiment 1
[0025] A method for preparing aminated magnetic nanocrystalline cellulose, comprising the following steps;
[0026] 1) Preparation of magnetic nanocrystalline cellulose: Dissolve 1 g of nanocrystalline cellulose in water, pass inert gas for 30 minutes, ultrasonically disperse for 20 minutes, heat up to 75 ° C, add 4 mmol FeCl 3 ·6H 2 O, 2mmol FeSO 4 ·7H 2 0, 5% sodium carboxymethyl cellulose and polydextrose, wherein the mass ratio of sodium carboxymethyl cellulose and polydextrose is 1:1, adjust the pH to be 9, react for 1h, stop feeding inert gas, and the external magnetic field will The product was separated from the solution, washed with deionized water and absolute ethanol, and dried in vacuum to obtain magnetic nanocrystalline cellulose for subsequent use;
[0027] 2) Preparation of aminated magnetic nanocrystalline cellulose: disperse 500 mg of magnetic carbon nanotubes evenly in 50 mM Tris buffer at room temperature at 25 ° C, adjust the pH to 8.5, add 250 mL of fre...
Embodiment 2
[0029] A method for preparing aminated magnetic nanocrystalline cellulose, comprising the following steps;
[0030] 1) Preparation of magnetic nanocrystalline cellulose: Dissolve 1 g of nanocrystalline cellulose in water, pass inert gas for 40 minutes, ultrasonically disperse for 30 minutes, heat up to 85 ° C, add 4 mmol FeCl 3 ·6H2 O, 2.5mmol FeSO 4 ·7H 2 0, 3% sodium carboxymethyl cellulose and polydextrose, wherein the mass ratio of sodium carboxymethyl cellulose and polydextrose is 2:1, adjust the pH to be 9, react for 1h, stop feeding inert gas, and the external magnetic field will The product was separated from the solution, washed with deionized water and absolute ethanol, and dried in vacuum to obtain magnetic nanocrystalline cellulose for subsequent use;
[0031] 2) Preparation of aminated magnetic nanocrystalline cellulose: disperse 500 mg of magnetic carbon nanotubes evenly in 50 mM Tris buffer at room temperature at 25 ° C, adjust the pH to 9, add 250 mL of fresh...
Embodiment 3
[0037] The aminated magnetic nanocrystalline cellulose prepared in Example 1 is a test group, and the magnetic nanocrystalline cellulose prepared in Example 2, Comparative Example 1, and Comparative Example 2 are a control group 1, a control group 2, and a control group 3. Test The adsorption time and adsorption capacity of each group when the adsorption of Pb(II) solution reaches adsorption equilibrium are shown in Table 1.
[0038] Test method: Take 0.8g Pb(NO 3 ) 2 Dissolved in 500mL deionized water, and configured as a mother solution with a Pb(II) concentration of 1000mg / L. The Pb(II) solutions of various concentrations required in the experiment were obtained by diluting the secondary mother solution. Put 20mL of Pb(II) solution with a concentration of 200mg / L in a 100mL Erlenmeyer flask, adjust the pH to 5-6, and add samples of each group with a dose of 5-20mg.
[0039] The Erlenmeyer flask containing the test solution was placed in a shaker at a rotational speed of 1...
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