Nitrogen and boron doped graphite phase carbon nitride quantum dot as well as preparation method and application thereof
A technology of graphite phase carbon nitride and quantum dots, which can be used in chemical instruments and methods, nitrogen compounds, nitrogen and non-metallic compounds, etc., and can solve the problem of low detection sensitivity
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[0028] The invention provides a nitrogen boron doped g-C 3 N 4 A method for preparing quantum dots, comprising the following steps:
[0029] Mix nitrogen-containing organic matter and boron source for thermal decomposition to obtain B-g-C 3 N 4 solid powder;
[0030] Put the B-g-C 3 N 4 The solid powder is mixed with water and dispersed to obtain B-g-C 3 N 4 Dispersions;
[0031] Put the B-g-C 3 N 4 The dispersion liquid is mixed with ammonia water and subjected to a hydrothermal reaction to obtain the nitrogen-boron doped g-C 3 N 4 quantum dots.
[0032] The present invention mixes nitrogen-containing organic matter and boron source, conducts thermal decomposition, and obtains B-g-C 3 N 4 solid powder. In the present invention, the nitrogen-containing organic matter is preferably melamine or urea, more preferably melamine; the boron source is preferably boric acid and / or ammonium borate, more preferably boric acid; the ammonium borate is preferably ammonium met...
Embodiment 1
[0074] (1) Weigh 3g of melamine and 0.05g of boric acid solid powder, after fully grinding, add 50mL of deionized water and stir for 1h to mix completely, put the mixed solution in an oven and dry at 60°C for 12h, and then fully grind Put it into an alumina crucible and place it in a well-type furnace with a programmed temperature rise rate of 4°C / min, keep it at 550°C for 4 hours, then cool it down to room temperature naturally, and grind it into powdery B-g-C3 N 4 Ready to use, the particle size is 10-20 μm.
[0075] (2) Weigh 100mg of powdered B-g-C 3 N 4 , added to a beaker filled with 100mL deionized water, continuous ultrasonic 13h; B-g-C 3 N 4 The suspension was centrifuged at 8000rpm / min for 15min; the supernatant was taken out and sonicated for 0.5h, then centrifuged at 10000rpm / min for 15min; the supernatant was taken out and sonicated for 0.5h and centrifuged at 12000rpm / min for 15min to obtain a stable and uniform B-g-C 3 N 4 Quantum dot dispersion; the B-g-C ...
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