Magnetic cadmium ion-imprinted polymer and preparation method thereof
A technology for imprinting polymers and cadmium ions, which is applied in the field of food safety and can solve the problem of less imprinting of magnetic ions
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[0077] Example 1 Preparation method of magnetic cadmium ion imprinted polymer
[0078] The preparation method of magnetic cadmium ion imprinted polymer includes the following steps:
[0079] S1. Preparation of Fe 3 O 4 Particles:
[0080] Weigh 0.02mol Fe 3 Cl 3 ·6H 2 O, 0.012mol FeCl 2 ·4H 2 Put O in a 250ml Erlenmeyer flask, dissolve it in 100ml ultrapure water under nitrogen, heat and stir to 80℃ in a constant temperature magnetic stirrer, add 10ml ammonia and 2ml PEG200, heat and stir for 3h, the reaction is over, cool to room temperature, use a magnet After separating and removing the supernatant, wash with ethanol and ultrapure water 3 times each, dry in an oven at 60℃, and grind to obtain Fe 3 O 4 powder;
[0081] S2. Preparation of Fe 3 O 4 @SiO 2 :
[0082] Weigh 0.5g Fe 3 O 4 Disperse the powder into a mixed solution of 100ml distilled water, 50ml ethanol and 10ml ammonia, add 0.5ml TEOS dropwise, and stir for 6h at room temperature to obtain Fe 3 O 4 @SiO 2 Particles
[0083]...
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[0087] Example 2 Optimization of preparation process-selection of functional monomers (methacrylic acid and acrylamide)
[0088] 1. The preparation method is the same as that of Example 1, except that the functional monomers used in step S4-methacrylic acid and acrylamide, are replaced with the following different combinations:
[0089] (1) Methacrylic acid;
[0090] (2) Vinylpyridine;
[0091] (3) Acrylamide;
[0092] (4) Methacrylic acid and vinyl pyridine;
[0093] (5) Methacrylic acid and acrylamide;
[0094] (6) Acrylamide and vinyl pyridine.
[0095] The functional monomers were screened by comparing the cadmium adsorption capacity of different functional monomers.
[0096] 2. The results are attached figure 1 As shown, in the preparation of magnetic cadmium ion imprinted polymer (M-IIP), the adsorption capacity of ion imprinted polymer prepared by bifunctional monomer is higher than that of ion imprinted polymer prepared by monofunctional monomer. Among the body combinations, methac...
Example Embodiment
[0097] Example 3 Optimization of the preparation process-selection of the ratio of methacrylic acid and acrylamide
[0098] 1. The preparation method is the same as that of Example 1. The difference is that the functional monomers used in step S4-methacrylic acid and acrylamide have different ratios, namely: 1:1, 1:3, and 3:1.
[0099] 2. The results are attached figure 2 As shown, when the ratio of methacrylic acid and acrylamide is 3:1, the adsorption capacity of cadmium is the highest.
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