Preparation method and application of a carbon dot-based nanocomposite for detecting iron ions
A nanocomposite, iron ion technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, and can solve problems such as limiting applications
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Embodiment 1
[0029] The preparation method of the carbon dot-based nanocomposite for detecting iron ions of the present embodiment includes the following steps:
[0030] 1) Weigh 0.5g of urea and 0.25g of polyacrylic acid (PAA) and dissolve in 30mL of deionized water, continue to stir for 20min and mix well, then transfer the mixture solution to a polytetrafluoroethylene hydrothermal reactor and tighten and seal it. Constant temperature reaction 10h. After the reaction kettle was naturally cooled to room temperature, the obtained solution was then dialyzed with a dialysis bag (molecular weight cut-off of 3000 Da) to remove unreacted small molecules. Finally, the light yellow solid product N-CDs was obtained by freeze-drying method.
[0031] 2) Dissolve 10 mg of N-CDs in 10 mL of deionized water, add 1 g of melamine, stir evenly, and then place in an oil bath at 150° C. for conventional heating and reaction for 2 hours. After cooling to room temperature, the mixture was centrifuged to rem...
Embodiment 2
[0033] The preparation method of the carbon dot-based nanocomposite for detecting iron ions in this embodiment is different from the one introduced in Embodiment 1 only in that:
[0034] In step 1), the amount of urea is 0.2g, the amount of PAA is 0.1g; the hydrothermal reaction temperature is 180°C, and the time is 12h.
[0035] In step 2), the amount of N-CDs is 2 mg, and the amount of melamine is 0.5 g; the heating reaction condition is 160° C. for 1.5 h.
Embodiment 3
[0037] The preparation method of the carbon dot-based nanocomposite for detecting iron ions in this embodiment is different from the one introduced in Embodiment 1 only in that:
[0038] In step 1), the consumption of urea is 0.9g, the consumption of PAA is 0.5g; the hydrothermal reaction temperature is 220°C, and the time is 8h.
[0039] In step 2), the consumption of N-CDs is 30 mg, and the consumption of melamine is 5 g. The heating reaction conditions were 140°C for 3h.
[0040] 2. Application of the carbon dot-based nanocomposite of the present invention
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