Preparation method of carbon quantum dot containing calcium alginate gel for detecting copper ions
A technology of calcium alginate and carbon quantum dots, applied in chemical instruments and methods, luminescent materials, material excitation analysis, etc., can solve the problems of complex and cumbersome processing steps, low detection sensitivity, poor selectivity, etc., and achieve excellent forming ability and enhanced Fluorescent properties and excellent formability
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Embodiment 1
[0024] A preparation method for calcium alginate gel containing carbon quantum dots for detecting copper ions, comprising the following steps:
[0025] (1) Weigh 2g of graphene and put it into a conical flask for ultrasonic treatment for 8min, then add it to 100ml of HNO with a concentration of 3mol / L 3 Reflux acid cooking in the solution for 12 hours to fully dissolve the carbon-containing substances; after natural cooling, centrifuge for 45 minutes with a centrifuge with a rotating speed of 8000r / min, and take the clear liquid to obtain fluorescent carbon quantum dots;
[0026] (2) Take 10 ml of the above-mentioned fluorescent carbon quantum dots and neutralize them with NaOH solution until the pH value is 7, dilute the neutralized fluorescent carbon quantum dots with distilled water to 100ml, add 0.3g of sodium borohydride for reduction, and stir for 12 hours. It fully reacts to obtain reduced carbon quantum dots with enhanced fluorescence;
[0027] (3) Take 32ml of the ab...
Embodiment 2
[0030] A preparation method for calcium alginate gel containing carbon quantum dots for detecting copper ions, comprising the following steps:
[0031] (1) Weigh 2g of activated carbon and put it into a conical flask for ultrasonic treatment for 9 minutes, then add 100ml of HNO with a concentration of 4mol / L 3 Reflux acid cooking in the solution for 9 hours to fully dissolve the carbon-containing substances; after natural cooling, centrifuge with a centrifuge with a speed of 10000r / min for 35min, and take the clear liquid to obtain fluorescent carbon quantum dots;
[0032] (2) Take 10 ml of the above-mentioned fluorescent carbon quantum dots and neutralize them with NaOH solution until the pH value is 7.5, dilute the neutralized fluorescent carbon quantum dots with distilled water to 100ml, add 0.35g of sodium borohydride for reduction, and stir for 8.5 h Make it react fully to obtain reduced carbon quantum dots with enhanced fluorescence;
[0033] (3) Take 50ml of the above-...
Embodiment 3
[0036] A preparation method for calcium alginate gel containing carbon quantum dots for detecting copper ions, comprising the following steps:
[0037] (1) Weigh 2g of carbon black and put it into a conical flask for ultrasonic treatment for 10min, then add it to 100ml of HNO with a concentration of 2mol / L 3 Carry out reflux acid boiling in the solution for 10 hours to fully dissolve the carbon-containing substances; after natural cooling, use a centrifuge with a speed of 9000r / min to centrifuge for 40 minutes, and take the clear liquid to obtain fluorescent carbon quantum dots;
[0038] (2) Take 10 ml of the above-mentioned fluorescent carbon quantum dots and neutralize them with NaOH solution until the pH value is 6.5, dilute the neutralized fluorescent carbon quantum dots to 100ml, add 0.32g of sodium borohydride for reduction, and stir for 10 hours to fully reaction to obtain reduced carbon quantum dots with enhanced fluorescence;
[0039] (3) Take 12.5ml of the above-men...
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