a kind of sio 2 Preparation method and application of metal ion imprinted polymer on /go surface
A technology of ion imprinting and surface metal, applied in the direction of alkali metal compounds, alkali metal oxides/hydroxides, chemical instruments and methods, etc., can solve the problem of reducing the transmission rate and recognition ability of target molecules, large diffusion resistance inside the medium, and poor It has problems such as real-time sensitivity, and achieves excellent specific recognition performance, good mechanical properties and thermal stability, and avoids incomplete elution.
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Embodiment 1
[0048] (1) Take 5 mL of 2 g / L graphene oxide aqueous solution and conical flask, and then add 40 mL of absolute ethanol; and weigh 0.2 g of polyvinylpyrrolidone into the above mixed solution, and stir magnetically for 30 min at room temperature. Then, 2 mL of concentrated ammonia water and 0.5 mL of tetraethyl orthosilicate were added to the above mixed solution, and ultrasonically reacted for 30 min. Finally, it was placed in a 30 °C water bath for 12 h. After the reaction, washed with deionized water to neutrality, and vacuum-dried at 50 ° C to obtain silica / graphene oxide composite material (SiO 2 / GO).
[0049] (2) The 50 mg SiO obtained in step (1) was 2 / GO was added to 25 mL of ethanol solution and sonicated to make it uniformly dispersed. Then, 2.5 mL of MPS was added to the above mixed solution, placed in a 30 °C water bath, and magnetically stirred for 8 h. After the reaction, the product was washed with ethanol and deionized water for 5 times in turn to elute the...
Embodiment 2
[0056] (1) Take 5 mL of 2 g / L graphene oxide aqueous solution and conical flask, then add 40 mL of absolute ethanol; and weigh 0.5 g of polyvinylpyrrolidone into the above mixed solution, and stir magnetically for 60 min at room temperature. Then, 2 mL of concentrated ammonia water and 0.5 mL of tetraethyl orthosilicate were added to the above mixed solution, and ultrasonically reacted for 60 min. Finally, it was placed in a 40 °C water bath for 24 h. After the reaction, washed with deionized water to neutrality, and vacuum-dried at 50 ° C to obtain silica / graphene oxide composite material (SiO 2 / GO).
[0057] (2) The 100 mg SiO obtained in step (1) was 2 / GO was added to 50 mL of ethanol solution and sonicated to make it uniformly dispersed. Then, 5 mL of MPS was added to the above mixed solution, placed in a 40 °C water bath, and magnetically stirred for 12 h. After the reaction, the product was washed with ethanol and deionized water for 5 times in turn to elute the unr...
Embodiment 3
[0063] (1) Take 5 mL of 2 g / L graphene oxide aqueous solution and conical flask, and then add 40 mL of absolute ethanol; and weigh 1 g of polyvinylpyrrolidone in the above mixed solution, and stir magnetically for 90 min at room temperature. Then, 2 mL of concentrated ammonia water and 0.5 mL of tetraethyl orthosilicate were added to the above mixed solution, and ultrasonically reacted for 90 min. Finally, it was placed in a 50 °C water bath for 36 h. After the reaction, washed with deionized water to neutrality, and vacuum-dried at 50 ° C to obtain silica / graphene oxide composite material (SiO 2 / GO).
[0064] (2) The 200 mg SiO obtained in step (1) was 2 / GO was added to 100 mL of ethanol solution and sonicated to make it uniformly dispersed. Then, 10 mL of MPS was added to the above mixed solution, placed in a 50 °C water bath, and magnetically stirred for 24 h. After the reaction, the product was washed with ethanol and deionized water for 5 times in turn to elute the u...
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