A method for the detection of trivalent gold ions
A gold ion and fluorescence measurement technology, applied in the field of chemical detection, can solve the problems of cumbersome probe synthesis process, peripheral nervous system damage, potential toxicity of human body, etc., and achieve the effect of strong selectivity, simple synthesis method and low cost
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Embodiment 1
[0023] The preparation of embodiment 1 graphene quantum dot
[0024] Add 2g of citric acid and 0.2g of L-cysteine into a 25mL reactor, then add 5mL of deionized water and mix well, heat to 200°C for 8 hours, cool to room temperature, and dilute to 100mL with deionized water. Obtain the graphene quantum dot solution of 14.7mg / mL, express as L-GQDs-8, carry out each measurement (table 1) with quinine sulfate as contrast, calculate and obtain L-cysteine functionalization according to formula (1) The fluorescent quantum yield of the fluorescent graphene quantum dots is 26.5% (Table 1).
[0025] Q = Q r × I I r × A r A × n 2 n r 2 - - ...
Embodiment 2
[0030] The synthesis of embodiment 2 graphene quantum dots
[0031] 1. Add 2g of citric acid and 0.2g of L-cysteine into a 25mL reactor, then add 5mL of deionized water and mix well, heat to 200°C for 4 hours, cool to room temperature, and dilute with deionized water to 100mL to obtain a graphene quantum dot solution, expressed as L-GQDs-4.
[0032] 2. Add 2g of citric acid and 0.2g of L-cysteine into a 25mL reactor, then add 5mL of deionized water and mix evenly, heat to 200°C for 6 hours, cool to room temperature, and dilute with deionized water to 100mL to obtain a graphene quantum dot solution, expressed as L-GQDs-6.
[0033] 3. Add 2g of citric acid and 0.2g of L-cysteine into a 25mL reactor, then add 5mL of deionized water and mix evenly, heat to 200°C for 8 hours, cool to room temperature, and dilute with deionized water to 100mL to obtain a graphene quantum dot solution, expressed as L-GQDs-8.
[0034] 4. Add 2g of citric acid and 0.2g of L-cysteine into a 2...
Embodiment 3
[0038] Embodiment 3 graphene quantum dots react with gold ions
[0039] Mix 100μL 14.7mg / mL graphene quantum dot solution L-GQDs-8 and 500μL 0.2M citric acid-0.1M disodium hydrogen phosphate buffer solution (pH=5.0), add trivalent gold ion standard solution and dilute to 10mL for fluorescence measurement, as the concentration of trivalent gold ions increases, the fluorescence intensity at 440nm gradually decreases. Fluorescence emission diagram see Figure 5 .
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