Preparation method of stable, high-brightness and bright-colored purple CQD
A high-brightness and stable technology, applied in the field of preparation of purple CQDs, can solve the problems of non-compliance with green environmental protection, poor product stability, complex preparation conditions, etc., and achieve the effects of easy storage, not easy to return to moisture, and simple preparation conditions.
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Embodiment 1
[0037] A stable, high-brightness and bright-coloured purple CQD preparation method, the specific steps are as follows:
[0038] (1) After mixing CA, OPD, MPD and water to obtain the reaction solution, use sodium hydroxide to adjust the pH value of the reaction solution to 5; wherein, the molar ratio of OPD, CA and MPD is 1.5:1:1.5, and OPD and water The ratio of 324mg: 20mL;
[0039] (2) the reaction solution that the pH that step (1) obtains is 5 is joined in the polytetrafluoroethylene reactor, then the polytetrafluoroethylene reactor is put into the electric blast drying box, under normal pressure (100KPa), React at a temperature of 100°C for 8 hours, then cool the reaction liquid after the reaction to 23°C, filter it with a 0.22 μm filter membrane, and finally freeze the filtrate obtained by liquid nitrogen and freeze it in a freeze dryer. After vacuum drying for 2 d, purple CQD powders were obtained, that is, stable, high-brightness and colorful purple CQDs.
[0040] Th...
Embodiment 2
[0044] A stable, high-brightness and bright-coloured purple CQD preparation method, the specific steps are as follows:
[0045] (1) After mixing CA, OPD, MPD and water to obtain the reaction solution, use sodium hydroxide to adjust the pH value of the reaction solution to 6; wherein, the mol ratio of OPD, CA and MPD is 1.5:1.2:0.3, and OPD and water The ratio is 324mg:24mL;
[0046] (2) the reaction solution that the pH that step (1) obtains is 6 is joined in the polytetrafluoroethylene reactor, then the polytetrafluoroethylene reactor is put into the electric blast drying box, under normal pressure (100KPa), React at a temperature of 110°C for 7 hours, then cool the reaction liquid after the reaction to 24°C, filter it with a 0.22 μm filter membrane, and finally freeze the filtrate obtained by liquid nitrogen and freeze it in a freeze dryer After vacuum drying for 3 d, purple CQD powders were obtained, that is, stable, high-brightness and colorful purple CQDs.
[0047] The ...
Embodiment 3
[0049] A stable, high-brightness and bright-coloured purple CQD preparation method, the specific steps are as follows:
[0050] (1) After mixing CA, OPD, MPD and water to obtain the reaction solution, use sodium hydroxide to adjust the pH value of the reaction solution to 7; wherein, the mol ratio of OPD, CA and MPD is 1.5:1.5:0.5, and OPD and water The ratio of 324mg: 26mL;
[0051] (2) the reaction solution that the pH obtained in step (1) is 7 is added in the polytetrafluoroethylene reactor, then the polytetrafluoroethylene reactor is put into an electric blast drying box, under normal pressure (100KPa), React at a temperature of 120°C for 6 hours, then cool the reaction liquid after the reaction to 25°C, filter it with a 0.22 μm filter membrane, and finally freeze the filtrate obtained by liquid nitrogen and freeze it in a freeze dryer. After vacuum drying for 4 d, purple CQD powders were obtained, that is, stable, high-brightness and bright-colored purple CQDs.
[0052]...
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