Graphite-phase carbon nitride quantum dot compound as well as synthesis method and biological application thereof
A graphite phase carbon nitride and synthesis method technology, applied in the field of analytical chemistry, can solve the problems of narrow excitation wavelength range, complex synthesis, wide emission range, etc., achieve mass production, simple synthesis process, and reduce costs
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Embodiment 1
[0042] Embodiment 1: manganese dioxide-sulfur oxygen co-doped graphite phase carbon nitride quantum dot composite (MnO 2 -S,O-CNQDs) synthesis
Embodiment 1-1
[0044] Preparation of S,O-CNQDs solution: Accurately weigh 0.3722 g disodium edetate and 0.9134 g thiourea, put them in a mortar and grind them evenly, then transfer the powders to a crucible, and put them in an oven at 200 °C for reaction 2 h. After the reaction was completed, the crucible was cooled naturally, and the brown gel-like product was washed three times with absolute ethanol, and the washed product was dissolved in 10 mL of ultrapure water to obtain a brown-red solution. The above solution was centrifuged to obtain the supernatant, and then filtered with a 0.22 μm microporous membrane, and the filtrate was placed in a dialysis bag (molecular weight cut-off 500 Da) and dialyzed with ultrapure water for 8 h to obtain a purified S,O-CNQDs solution .
[0045] Manganese dioxide-sulfur-oxygen co-doped graphite phase carbon nitride quantum dot composite (MnO 2 -S,O-CNQDs) synthesis: Add 500 μL of S,O-CNQDs solution (3 mg / mL) dropwise into a centrifuge tube containing 1....
Embodiment 1-2
[0047] The preparation of the S,O-CNQDs solution was the same as in Example 1-1.
[0048] Manganese dioxide-sulfur-oxygen co-doped graphite phase carbon nitride quantum dot composite (MnO 2 -S,O-CNQDs) synthesis: 500 μL of S,O-CNQDs solution (0.1 mg / mL) was added dropwise into a centrifuge tube containing 1.5 mL of MES (0.1M, pH 6.0) buffer solution, and then 1 mL of Potassium permanganate solution (0.1mM) was added dropwise to the above centrifuge tube, and the volume was adjusted to 5 mL with ultrapure water, and ultrasonicated for 5 min until a brown colloidal solution was formed. The above solution was centrifuged for 10 min and washed three times with ultrapure water to obtain pure MnO 2 -S,O-CNQDs complex, MnO was obtained after freeze-drying 2 -S,O-CNQDs composite solid powder.
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