A kind of photocatalyst and preparation method thereof for hypoxic tumor nitric oxide treatment
A photocatalyst and nitric oxide technology, applied in the field of biomedicine, can solve the problems of few reports on biomedical applications, and achieve the effects of inducing tumor cell apoptosis, easy availability of raw materials, and simple method.
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[0019] A method for preparing a photocatalyst for hypoxic tumor nitric oxide treatment comprises the following steps:
[0020] (1) Preparation of carbon quantum dot solution: Dissolve citric acid and urea with a mass ratio of 4:1 in double-distilled water, place them in a polytetrafluoroethylene reactor, and react at a high temperature of 160-200°C for 16-20h, then Cool to room temperature, centrifuge the product at a speed of ≥10000rpm to remove the precipitate, put the supernatant into a dialysis bag for dialysis for 3-7 days, and then rotate and evaporate at 40-60 ℃ and a vacuum of 25-50 mbar , to obtain a concentration of 2 mg L -1 carbon quantum dot solution;
[0021] (2) Preparation of graphite phase carbon nitride doped with carbon quantum dots: Dissolve urea in the carbon quantum dot solution prepared in step (1), then put it into a crucible and heat to 500-600°C, react for 2-4h, After cooling, grind the product into powder and place it in a 5mol / L nitric acid soluti...
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[0027] Taking polyarginine-modified carbon quantum dot doped graphitic carbon nitride as an example, the specific preparation steps are as follows:
[0028] (1) Dissolve 2 g of citric acid and 0.5 g of urea in 25 mL of double-distilled water, place in a polytetrafluoroethylene reactor, heat up to 170 °C, and keep it warm for 18 h, then cool to room temperature, and The product was centrifuged at 10,000 rpm for 10 min, and the obtained supernatant was dialyzed in a dialysis bag with a molecular weight cut-off of 10 kDa for 7 days, and then the obtained dialysate was rotary evaporated at 40 °C and a vacuum of 25 mbar to prepare Obtain carbon quantum dot solution, its concentration is 2 mg L -1 ;
[0029] (2) Dissolve 10 g of urea in 5 mL of the above-prepared carbon quantum dot solution, then put it into a crucible and heat it at 5 °C min -1 The heating rate was increased to 550 °C, and the temperature was maintained for 3 h. Then cooled to room temperature, the product was p...
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