A kind of preparation method and application of fluorescent carbon quantum dots phe-cds
A technology of carbon quantum dots and phe-cds, which is applied in the field of preparation of fluorescent carbon quantum dots Phe-CDs, can solve the problems that the fluorescent quantum yield has not yet reached semiconductor quantum dots, immature preparation technology, limitations, etc., and achieves environmentally friendly and non-toxic Effects of contamination, highly selective detection, and simple synthesis method
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Embodiment 1
[0030] A preparation method of fluorescent carbon quantum dots Phe-CDs, the specific steps are as follows:
[0031] (1) Dissolve citric acid and phenylalanine in water to obtain mixed solution A; the concentration of citric acid in mixed solution A is 5 mmol / L, and the concentration of phenylalanine is 8 mmol / L;
[0032] (2) Put the mixed solution A in step (1) at a temperature of 180°C for a hydrothermal reaction for 30 hours until it shows blue fluorescence under an ultraviolet light to obtain a Phe-CDs solution;
[0033] (3) Dialyze the Phe-CDs solution in step (3) through the dialysis membrane for 6 hours, and then dry to obtain light yellow fluorescent carbon quantum dot Phe-CDs powder; the molecular cut-off of the dialysis membrane is 1000Da; the speed of centrifugation is 6000rpm , the centrifugation time is 10min;
[0034] The fluorescence excitation emission spectrum of the fluorescent carbon quantum dot Phe-CDs of this embodiment is shown in figure 1 , where the ab...
Embodiment 2
[0045] A preparation method of fluorescent carbon quantum dots Phe-CDs, the specific steps are as follows:
[0046](1) Dissolve citric acid and phenylalanine in water to obtain mixed solution A; the concentration of citric acid in mixed solution A is 5 mmol / L, and the concentration of phenylalanine is 10 mmol / L;
[0047] (2) Put the mixed solution A in step (1) under the condition of 180 ℃ for hydrothermal reaction for 30 h until it shows blue fluorescence under ultraviolet light to obtain the Phe-CDs solution;
[0048] (3) Dialyze the Phe-CDs solution in step (3) through the dialysis membrane for 6 h, and then dry to obtain light yellow fluorescent carbon quantum dot Phe-CDs powder; the molecular cut-off of the dialysis membrane is 1000 Da; the speed of centrifugal treatment 6000 rpm, centrifugation time is 10 min;
[0049] Selectivity test of carbon quantum dots to metal ions:
[0050] Take the light yellow fluorescent carbon quantum dot Phe-CDs powder of this embodiment, ...
Embodiment 3
[0056] A preparation method of fluorescent carbon quantum dots Phe-CDs, the specific steps are as follows:
[0057] (1) Dissolve citric acid and phenylalanine in water to obtain mixed solution A; the concentration of citric acid in mixed solution A is 5 mmol / L, and the concentration of phenylalanine is 12 mmol / L;
[0058] (2) Put the mixed solution A in step (1) under the condition of 180 °C for hydrothermal reaction for 30 h until it shows blue fluorescence under ultraviolet light to obtain the Phe-CDs solution;
[0059] (3) Dialyze the Phe-CDs solution in step (3) through the dialysis membrane for 6 h, and then dry to obtain light yellow fluorescent carbon quantum dot Phe-CDs powder; the molecular cut-off of the dialysis membrane is 1000 kDa; the rate of centrifugal treatment 6000 rpm, centrifugation time is 10min;
[0060] Selectivity test of carbon quantum dots to metal ions:
[0061] Take the light yellow fluorescent carbon quantum dot Phe-CDs powder of this embodiment,...
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