Magnetic molecularly imprinted polymer material and application thereof in electrochemical detection of catechinic acid
A technology of magnetic molecular imprinting and polymer materials, applied in the field of electrochemical detection, to achieve the effects of high sensitivity, low detection limit and wide quantitative range
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Embodiment 1
[0053] Example 1: Preparation of Magnetic Molecularly Imprinted Polymer Materials
[0054] (1) Preparation of Fe 3 O 4 Magnetic nanoparticles: 1.35 g of ferric chloride, 3.60 g of sodium acetate and 1.0 g of PEG6000 were weighed and dissolved in 50 mL of ethylene glycol, ultrasonically stirred for 30 min at room temperature, and then transferred to a PTFE-lined stainless steel autoclave 180°C for 6h. The resulting black product was separated with a magnet and washed three times with ethanol for further modification.
[0055] (2) Preparation of Fe 3 O 4 @MPS, put 0.6g of Fe 3 O 4 The magnetic nanoparticles were dispersed in the ethanol solution, sonicated for 30 min, and 25 mL of MPS solution (20% methanol, v / v) was added dropwise to Fe under mechanical stirring. 3 O 4 suspension of magnetic nanoparticles; after adding, stirring at room temperature for 24 hours, and finally collecting Fe with a magnet 3 O 4 @MPS product, washed three times with ethanol and stored at 4...
Embodiment 2
[0059] Example 2: Preparation of modified electrode
[0060] (1) Preparation of rGO-ZIF-8
[0061] The rGO and ZIF-8 were mixed by ultrasonic treatment in ultrapure water, and then hydrothermally reacted in a reactor at 150 °C for 4 h to prepare a uniform dispersion. After the reaction, ultrasonic treatment was continued for 10 minutes to obtain the self-assembled rGO-ZIF-8 nanocomposite.
[0062] Among them, rGO is obtained according to the following synthetic steps:
[0063] 1.50 g of flake graphite was mixed with 9.00 g of potassium permanganate, and 180 mL of concentrated sulfuric acid and 20 mL of nitric acid were added. The resulting mixture was placed under magnetic stirring at 50°C for 12h. After the reaction was completed, the product was poured into 200 mL of ice water containing a certain amount of hydrogen peroxide to obtain a yellow product. The mixture was centrifuged to remove the supernatant, washed with 0.1 M hydrochloric acid solution and water three time...
Embodiment 3
[0066] Example 3: Material characterization and performance studies
[0067] (1) rGO, ZIF-8, rGO-ZIF-8, Fe 3 O 4 Characterization of Magnetic Nanoparticles and Synthesized mMIP Materials
[0068] The morphology and structure were characterized by electron microscopy (SEM) and transmission electron microscopy (TEM). figure 1 are the TEM images of several materials, (a) is the TEM image of rGO, (b) is the TEM image of the rGO-ZIF-8 nanocomposite, (c) is the Fe 3 O 4 TEM image of magnetic nanoparticles, (d) is the TEM image of mMIP. figure 2 are SEM images, (a) is the SEM image of rGO, (b) is the SEM image of ZIF-8, (c) is the SEM image of the rGO-ZIF-8 nanocomposite, and (d) is the SEM image of mMIP. image 3 is the element mapping image of rGO-ZIF-8 nanocomposite under SEM, Figure 4 is the element mapping image under the scanning electron microscope of mMIP material.
[0069]Transmission electron microscopy and scanning electron microscopy showed the microstructure and...
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