Carbon quantum dot-calcium carbonate composite nanoparticle, and preparation method and application thereof
A technology of composite nanoparticles and carbon quantum dots, applied in the field of nanomaterials, can solve the problems of application limitation, easy decomposition, and high use cost, and achieve the effects of simple preparation method, excellent absorption effect, and low production cost.
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Embodiment 1
[0032] A kind of carbon quantum dot-calcium carbonate composite nano particle, its preparation method comprises the following steps:
[0033] 1) Disperse 3 g of citric acid and 1.5 g of polyethyleneimine with a number average molecular weight of 600 g / mol in 30 mL of distilled water, then transfer to a high-pressure reactor, react at 180 ° C for 3 h, cool the reaction solution to room temperature, and then use interception The dialysis bag with a molecular weight of 1000Da was dialyzed for 24 hours, and the dialysis bag was changed every 12 hours, then filtered with a microporous membrane with a pore size of 0.22 μm, and freeze-dried to obtain carbon quantum dots (brown powder);
[0034] 2) Disperse 0.5g of carbon quantum dots in 20mL of calcium chloride solution with a concentration of 0.1mol / L, then add 0.005g of malic acid, 0.005g of citric acid, 0.01g of diammonium hydrogen phosphate, and 0.005g of Hexaalkyltrimethylammonium bromide, 0.01g of polyethylene glycol with a num...
Embodiment 2
[0040] A kind of carbon quantum dot-calcium carbonate composite nano particle, its preparation method comprises the following steps:
[0041] 1) Disperse 2g of citric acid and 1g of polyethyleneimine with a number average molecular weight of 600g / mol in 20mL of distilled water, then transfer to a high-pressure reactor, react at 180°C for 3h, cool the reaction solution to room temperature, and then use the molecular weight cut-off The 1000Da dialysis bag was dialyzed for 24 hours, and the dialysis bag was changed every 12 hours, then filtered with a microporous membrane with a pore size of 0.22 μm, and freeze-dried to obtain carbon quantum dots (brown powder);
[0042] 2) Disperse 0.5g of carbon quantum dots in 20mL of calcium chloride solution with a concentration of 0.1mol / L, then add 0.01g of tartaric acid, 0.01g of diammonium hydrogen phosphate, and 0.005g of cetyltrimethyl bromide Ammonium chloride, 0.01g of polyethylene glycol with a number average molecular weight of 400...
Embodiment 3
[0046] A kind of carbon quantum dot-calcium carbonate composite nano particle, its preparation method comprises the following steps:
[0047] 1) Disperse 1 g of citric acid and 1 g of polyethyleneimine with a number average molecular weight of 600 g / mol in 20 mL of distilled water, then transfer to a high-pressure reactor, react at 180 ° C for 3 h, cool the reaction solution to room temperature, and then use the molecular weight cut-off The 1000Da dialysis bag was dialyzed for 24 hours, and the dialysis bag was changed every 12 hours, then filtered with a microporous membrane with a pore size of 0.22 μm, and freeze-dried to obtain carbon quantum dots (brown powder);
[0048] 2) Disperse 0.5g of carbon quantum dots in 20mL of calcium chloride solution with a concentration of 0.1mol / L, then add 0.02g of benzoic acid, 0.01g of diammonium hydrogen phosphate, and 0.005g of cetyltrimethyl Ammonium bromide, 0.01g of polyethylene glycol with a number average molecular weight of 4000g / ...
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