A fluorescent carbon dot, its preparation method and its application in detecting copper ions
A technology of fluorescent carbon dots and copper ions, which can be used in fluorescence/phosphorescence, chemical instruments and methods, nanocarbons, etc., and can solve problems such as complex processing
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Embodiment 1
[0044] The preparation of embodiment 1 fluorescent carbon dots (CDs)
[0045] The present embodiment provides a kind of preparation method of fluorescent carbon dot (CDs), specifically comprises the following steps:
[0046] Dissolve 0.2276g of humic acid and 0.1209g of urea in 25mL of water, and the molar ratio of humic acid to urea is 1:2. The mixture was uniformly stirred by ultrasonic wave for 10 min to obtain a brown turbid solution, which was transferred to a 30 mL autoclave and treated at 180 °C for 8 h. Immediately pour it into a 50mL centrifuge tube and centrifuge at a speed of 6500rpm for 5min. The supernatant was extracted, and then filtered with a 0.22 μm filter membrane to remove larger particles; the obtained solution was purified with a MWCO 1000Da dialysis bag at room temperature for 24 hours, and then dried to obtain fluorescent carbon dots.
[0047] The fluorescent carbon dots were made into an aqueous solution of fluorescent carbon dots and stored at 4°C f...
Embodiment 2
[0048] Embodiment 2: the method for laboratory simulation detection of copper ions in environmental water
[0049] The fluorescent carbon dots (CDs) solution that above-mentioned embodiment 1 prepares is added to containing different Cu 2+ Concentration of sodium chloride solution (sodium chloride content is 200mg / L, pH=6), carry out fluorescence quenching reaction, according to the fluorescence intensity change of detection and Cu 2+ The linear relationship between the concentrations, the establishment of a standard curve;
[0050] Add the fluorescent carbon dot solution to the water body to be tested containing sodium chloride to perform a fluorescence quenching reaction to obtain the change in fluorescence intensity;
[0051] Through the standard curve to calculate the Cu in the environmental water body to be tested 2+ concentration.
[0052] In this example, different carbon dot concentrations, reaction times and pH values of the reaction system were studied to obtain...
Embodiment 3
[0071] Example 3 Fluorescent carbon dots detect Cu in actual water samples 2+ Research
[0072] In order to further verify the reliability and feasibility of the method in practical applications, and to verify the applicability of the sensor, four water samples were collected in this embodiment to test Cu 2+ . These samples were taken from four water samples in Beijing, China, and the blank and spiked samples were analyzed with chemical sensors. The experimental conditions of the measured water samples were pH=6, the concentration of CDs in the water samples was 4 mg / L, and the concentration of NaCl was 200 mg / L. The spiked concentration was set at 0-1 μM, and the experimental results of the blank and spiked water samples are shown in Table 2.
[0073] Table 2:
[0074]
[0075]
[0076] As can be seen from Table 2: CDs as chemical sensors for Cu 2+ With high sensitivity, this method has certain competitiveness and can be used as a method for detecting Cu 2+ Tool o...
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Abstract
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