Graphite phase carbon nitride quantum dot and preparation method thereof
A graphitic carbon nitride, quantum dot technology, applied in chemical instruments and methods, nitrogen and non-metallic compounds, nanotechnology for materials and surface science, etc. Large-scale production, uneven quantum size, etc., to achieve the effects of high yield, short production cycle, and simple preparation method
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Embodiment 1
[0032] ①Dissolve urea and sodium chloride in 100mL of deionized water at a molar ratio of 40:1, stir well and mix evenly to make a colorless and transparent solution with a urea concentration of 6mol / L;
[0033] ②Place the prepared colorless transparent solution in a liquid nitrogen environment for 10 minutes, so that the solution is rapidly frozen into a whole, and a uniform white block solid is obtained;
[0034]③Quickly transfer the obtained massive solid to a vacuum freeze dryer at -80°C, set the vacuum degree to 8Pa, and freeze-dry for 48 hours to dry the solid to constant weight;
[0035] ④ Place the obtained solid in a crucible with a cover, and put it in an atmosphere furnace with a nitrogen flow rate of 7mL / min, raise the temperature to 500°C at 5°C / min, and keep it for 4h, then cool down with the furnace to obtain a light yellow color sample;
[0036] ⑤ The prepared light yellow sample is uniformly dispersed in deionized water, centrifuged at a speed of 800rpm for 3...
Embodiment 2
[0039] ① Dissolve urea and sodium chloride in 50 mL of deionized water at a molar ratio of 5:1, stir well and mix evenly to make a colorless and transparent solution with a urea concentration of 3 mol / L;
[0040] ②Place the prepared colorless transparent solution in a liquid nitrogen environment for 5 minutes, so that the solution is rapidly frozen into a whole, and a uniform white block solid is obtained;
[0041] ③Quickly transfer the obtained massive solid to a vacuum freeze dryer at -70°C, set the vacuum degree to 10Pa, and freeze-dry for 36 hours to dry the solid to constant weight;
[0042] ④Put the obtained solid in a crucible with a cover, and put it in an atmosphere furnace with a nitrogen flow rate of 3mL / min, raise the temperature to 600°C at 15°C / min, and keep it for 2h, then cool down with the furnace to get a light yellow color sample;
[0043] ⑤ The prepared light yellow sample is evenly dispersed in deionized water, centrifuged at a speed of 1500rpm for 10nm, ...
Embodiment 3
[0045] ①Dissolve urea and sodium chloride in 100mL deionized water at a molar ratio of 10:1, stir well and mix well to make a colorless and transparent solution with a urea concentration of 4mol / L;
[0046] ②Place the prepared colorless transparent solution in a liquid nitrogen environment for 10 minutes, so that the solution is rapidly frozen into a whole, and a uniform white block solid is obtained;
[0047] ③Quickly transfer the obtained massive solid to a vacuum freeze dryer at -80°C, set the vacuum degree to 8Pa, and freeze-dry for 48 hours to dry the solid to constant weight;
[0048] ④ Place the obtained solid in a crucible with a cover, and place it in an atmosphere furnace with a nitrogen flow rate of 5mL / min, raise the temperature to 550°C at 10°C / min, and keep it warm for 3h, then cool down with the furnace to obtain a light yellow color sample;
[0049] ⑤ The prepared light yellow sample is evenly dispersed in deionized water, centrifuged at a speed of 1000rpm for...
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