CN109609124B - Carbon quantum dot hydrogel and preparation method thereof, and method for detecting copper ions - Google Patents

Carbon quantum dot hydrogel and preparation method thereof, and method for detecting copper ions Download PDF

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CN109609124B
CN109609124B CN201910030766.7A CN201910030766A CN109609124B CN 109609124 B CN109609124 B CN 109609124B CN 201910030766 A CN201910030766 A CN 201910030766A CN 109609124 B CN109609124 B CN 109609124B
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CN109609124A (en
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刘长军
赵天啸
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BOE Technology Group Co Ltd
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Abstract

The disclosure provides a carbon quantum dot hydrogel, a preparation method thereof and a method for detecting copper ions. The carbon quantum dot hydrogel comprises carbon quantum dots and agarose hydrogel. The carbon quantum dots are bonded in the network structure of the agarose hydrogel.

Description

Carbon quantum dot hydrogel and preparation method thereof, and method for detecting copper ions
Technical Field
The disclosure relates to the technical field of nano materials, in particular to a carbon quantum dot hydrogel and a preparation method thereof, and a method for detecting copper ions.
Background
Copper is an important vital element. Copper is second only to zinc and iron in the human body. Copper plays an important role in the biosynthesis and metabolism of human bodies. However, excessive copper ion content in human body tends to induce neurological diseases. Moreover, copper is a heavy metal element and is one of the most common hazardous metal elements in sewage. Copper ions cannot be biodegraded and easily cause killing harm to organic life bodies in water such as algae. But also the food chain can cause enrichment amplification effect on copper ions. Therefore, controlling the copper content in water is important for protecting the environment and promoting human health. At present, the detection method of copper ions mainly comprises high performance liquid chromatography, ion chromatography, atomic spectrometry, mass spectrometry and the like.
Disclosure of Invention
According to an aspect of an embodiment of the present disclosure, there is provided a carbon quantum dot hydrogel including: the carbon quantum dots are bonded in the reticular structure of the agarose hydrogel.
In some embodiments, the carbon quantum dots have a diameter ranging from 1nm to 10 nm.
In some embodiments, the carbon quantum dots are aminated carbon quantum dots.
According to another aspect of the embodiments of the present disclosure, there is provided a method for preparing a carbon quantum dot hydrogel, including: mixing agarose powder with deionized water, uniformly stirring, and heating to form a first solution; adding an amino compound to the first solution and stirring uniformly to form a second solution; heating the second solution to form a third solution; and cooling the third solution to form a carbon quantum dot hydrogel.
In some embodiments, the method of making further comprises: soaking the carbon quantum dot hydrogel in deionized water to dialyze the carbon quantum dot hydrogel, thereby removing residues.
In some embodiments, the agarose, the amino compound, and the deionized water are mixed in a ratio of 1: (0.8-2.5): (30-50).
In some embodiments, the raw material ratio of the agarose, the amino compound and the deionized water is 1:1: 40.
In some embodiments, the amino compound comprises a polyamino compound.
In some embodiments, the polyamino compound comprises ethylene diamine.
In some embodiments, the heating method is microwave heating.
In some embodiments, the first microwave heating is performed to form the first solution, the microwave power ranges from 500 watts to 650 watts, and the heating time ranges from 0.5 minutes to 1 minute.
In some embodiments, the second microwave heating is performed to form the third solution, the microwave power ranging from 700 watts to 750 watts, and the heating time ranging from 1 minute to 4 minutes.
In some embodiments, the step of cooling the third solution to form the carbon quantum dot hydrogel comprises: and injecting the third solution into a mold, and naturally cooling to form the carbon quantum dot hydrogel.
According to another aspect of the embodiments of the present disclosure, there is provided a method for detecting copper ions, including: copper ions were detected using a carbon quantum dot hydrogel as described previously.
In some embodiments, the step of detecting copper ions using the carbon quantum dot hydrogel comprises: soaking the carbon quantum dot hydrogel into a liquid to be detected; taking out the carbon quantum dot hydrogel from the liquid, and detecting the fluorescence intensity of the carbon quantum dot hydrogel; and comparing the detected fluorescence intensity with the fluorescence intensity of the carbon quantum dot hydrogel without being soaked in the liquid, and determining that the liquid contains copper ions if the detected fluorescence intensity is weaker than the fluorescence intensity of the carbon quantum dot hydrogel without being soaked in the liquid.
In some embodiments, the degree of decrease in the detected fluorescence intensity is directly related to the concentration of copper ions contained in the liquid.
In some embodiments, the method further comprises: determining the concentration of copper ions contained in the liquid based on the degree of decrease in the intensity of the detected fluorescence.
In some embodiments, for at 10-4The fluorescence intensity of the carbon quantum dot hydrogel is linearly related to the concentration of the copper ions within the order of mol/L.
Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.
The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:
fig. 1 is a schematic diagram illustrating the structure of a carbon quantum dot hydrogel according to some embodiments of the present disclosure;
FIG. 2 is a schematic diagram showing percentages of carbon quantum dots having various diameters, according to some embodiments of the present disclosure;
FIG. 3 is a graph showing photoluminescence spectra of carbon quantum dot hydrogels under different wavelengths of light excitation according to some embodiments of the present disclosure;
fig. 4 is a graph showing photoluminescence spectra of carbon quantum dot hydrogels after being soaked with solutions of different copper ion concentrations according to some embodiments of the present disclosure;
FIG. 5A is a graph showing photoluminescence spectra of carbon quantum dot hydrogels after being soaked with solutions of different copper ion concentrations according to further embodiments of the present disclosure;
figure 5B is a schematic diagram illustrating photoluminescence intensity of a carbon quantum dot hydrogel as a function of copper ion concentration according to some embodiments of the present disclosure;
fig. 6 is a flow chart illustrating a method of making a carbon quantum dot hydrogel according to some embodiments of the present disclosure;
fig. 7 is a flow chart illustrating a method for detecting copper ions according to some embodiments of the present disclosure.
It should be understood that the dimensions of the various parts shown in the figures are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments are to be construed as merely illustrative, and not as limitative, unless specifically stated otherwise.
The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered.
All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
The inventors of the present disclosure found that the copper ion detection method in the related art is complicated in operation and expensive in the instrument used.
In view of this, embodiments of the present disclosure provide a carbon quantum dot hydrogel. When the carbon quantum dot hydrogel is used for detecting copper ions, the operation is more convenient, and the cost is lower.
The structure of the carbon quantum dot hydrogel according to some embodiments of the present disclosure is described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram illustrating the structure of a carbon quantum dot hydrogel according to some embodiments of the present disclosure.
As shown in fig. 1, the carbon quantum dot hydrogel includes carbon quantum dots 11 and agarose hydrogel 12. The carbon quantum dots 11 are bonded in the network structure of the agarose hydrogel 12.
For example, an agarose hydrogel may be a network of agarose and water. The carbon quantum dots are bonded to atoms or groups of atoms at the intersections of the network.
For example, in a network of agarose and water, 0.5 or 1 carbon quantum dots are connected (or contained) on average per unit grid.
In this embodiment, a carbon quantum dot hydrogel according to some embodiments of the present disclosure is provided. The carbon quantum dot hydrogel comprises carbon quantum dots and agarose hydrogel. The carbon quantum dots are embedded in the three-dimensional network structure of the agarose.
The carbon quantum dot hydrogel of the embodiments of the present disclosure may be used to detect copper ions. Because the carbon quantum dot hydrogel is in a gel state, the operation of detecting copper ions by using the carbon quantum dot hydrogel is more convenient. In addition, the cost for detecting copper ions by using the carbon quantum dot hydrogel is low.
In some embodiments, the carbon quantum dots 11 may be aminated carbon quantum dots. For example, the carbon quantum dots may include a carbon core and an organic functional group (not shown in the drawings) on the surface of the carbon core. For example, the organic functional group may include an amino group or the like.
In some embodiments, the carbon quantum dots 11 are granular.
In some embodiments, the carbon quantum dots 11 range in diameter from 1nm to 10 nm. For example, the carbon quantum dots may have a diameter of 1.5nm, 2nm, 2.5nm, 3nm, or the like.
Fig. 2 is a percentage diagram illustrating carbon quantum dots having various diameters according to some embodiments of the present disclosure.
As shown in fig. 2, in the carbon quantum dot hydrogel of some examples, carbon quantum dots having a diameter of 1.0nm account for 10% of the total number of the carbon quantum dots, carbon quantum dots having a diameter of 1.5nm account for 25% of the total number of the carbon quantum dots, carbon quantum dots having a diameter of 2.0nm account for 30% of the total number of the carbon quantum dots, carbon quantum dots having a diameter of 2.5nm account for 30% of the total number of the carbon quantum dots, and carbon quantum dots having a diameter of 3.0nm account for 5% of the total number of the carbon quantum dots. It can be seen that the diameter size of the carbon ion dots is substantially in the order of nanometers. Also in this embodiment, the diameter size of the carbon ion dots is mostly concentrated in the range of 1.5nm to 2.5 nm.
In some embodiments of the present disclosure, the above-described carbon quantum dot hydrogels have typical polychromatic fluorescence characteristics. For example, under the excitation of ultraviolet light, the carbon quantum dot hydrogel can show blue fluorescence; under the excitation of blue light, the carbon quantum dot hydrogel can show green fluorescence; under the excitation of green light, the carbon quantum dot hydrogel can show red fluorescence.
Fig. 3 is a graph showing photoluminescence spectra of carbon quantum dot hydrogels excited by different wavelengths of light according to some embodiments of the present disclosure.
For example, FIG. 3 shows a fluorescence spectrum line (i.e., photoluminescence spectrum line) 301 under excitation with light having a wavelength of 340nm, a fluorescence spectrum line 302 under excitation with light having a wavelength of 360nm, a fluorescence spectrum line 303 under excitation with light having a wavelength of 380nm, a fluorescence spectrum line 304 under excitation with light having a wavelength of 400nm, a fluorescence spectrum line 305 under excitation with light having a wavelength of 420nm, and a fluorescence spectrum line 306 under excitation with light having a wavelength of 440 nm. As can be seen from fig. 3, the carbon quantum dot hydrogel has photoluminescence characteristics (i.e., fluorescence characteristics). The photoluminescence intensity (i.e., fluorescence intensity) of the carbon quantum dot hydrogel is different under excitation of light of different wavelengths. In addition, the photoluminescence intensity of the carbon quantum dot hydrogel under the excitation of light with the wavelength ranging from 380nm to 400nm is relatively large.
As can be seen from fig. 3, the fluorescence characteristics of the carbon quantum dot hydrogel have a dependence on the excitation wavelength. That is, as the excitation wavelength increases, the emission spectrum is red-shifted.
Fig. 4 is a graph showing photoluminescence spectra of carbon quantum dot hydrogels after being soaked with solutions of different copper ion concentrations according to some embodiments of the present disclosure.
For example, fig. 4 shows fluorescence spectral lines 401, 402, 403, 404, 405, and 406 of a carbon quantum dot hydrogel after soaking in solutions of different copper ion concentrations. For example, from the fluorescence spectrum line 401 to the fluorescence spectrum line 406, the concentration of copper ions corresponding to these spectrum lines is 1X 10-6The order of mol/L is increased to 1 x 10-1In the order of mol/L.
Here, C401<C402<C403<C404<C405<C406，
Wherein, C401Represents the concentration of copper ions, C, corresponding to the fluorescence spectrum line 401402Represents the copper ion concentration, C, corresponding to the fluorescence spectrum line 402403Indicates the concentration of copper ions, C, corresponding to the fluorescence spectrum line 403404Represents the copper ion concentration, C, corresponding to the fluorescence spectrum line 404405Indicates the concentration of copper ions, C, corresponding to the fluorescence spectrum line 405406Indicates the copper ion concentration corresponding to the fluorescence spectrum line 406.
As can be seen from fig. 4, the fluorescence intensity of the carbon quantum dot hydrogel gradually decreased as the copper ion concentration gradually increased. Therefore, the copper ions can weaken the fluorescence intensity of the carbon quantum dot hydrogel (which can be referred to as fluorescence quenching characteristics). Further, the greater the copper ion concentration, the more the fluorescence intensity decreases. By utilizing such characteristics, whether the liquid contains copper ions can be detected by using the carbon quantum dot hydrogel.
Fig. 5A is a graph showing photoluminescence spectra of carbon quantum dot hydrogels after being soaked in solutions of different copper ion concentrations according to further embodiments of the present disclosure.
For example, FIG. 5A shows the copper ion concentration at 10-4 Fluorescence spectrum lines 501, 502, 503, 504, 505 and 506 of the carbon quantum dot hydrogel after soaking in the solution in the order of magnitude of mol/L. For example, from the fluorescence spectrum line 501 to the fluorescence spectrum line 506, the concentrations of copper ions corresponding to these spectrum lines are sequentially 1X 10-4The mol/L is increased to 5X 10-4mol/L。
Here, the first and second liquid crystal display panels are,
C501<C502<C503<C504<C505<C506，
wherein, C501Represents the copper ion concentration, C, corresponding to the fluorescence spectrum line 501502Represents the copper ion concentration, C, corresponding to the fluorescence spectrum line 502503Indicates the concentration of copper ions, C, corresponding to the fluorescence spectrum line 503504Represents the copper ion concentration, C, corresponding to the fluorescence spectrum line 504505Represents the copper ion concentration, C, corresponding to the fluorescence spectrum line 505506Indicates the copper ion concentration corresponding to the fluorescence spectrum line 506.
As can be seen from FIG. 5A, for the point 10-4The photoluminescence intensity of the carbon quantum dot hydrogel is basically and uniformly reduced along with the gradual increase of the concentration of the copper ions within the range of the order of mol/L.
Figure 5B is a schematic diagram illustrating photoluminescence intensity of a carbon quantum dot hydrogel as a function of copper ion concentration according to some embodiments of the present disclosure.
In FIG. 5B, the abscissa is 10-4The copper ion concentration of mol/L magnitude, the ordinate is I/I0. Where I is the photoluminescence intensity of the carbon quantum dot hydrogel after being soaked in a solution containing copper ions, and I is0The photoluminescence intensity of the carbon quantum dot hydrogel in the solution which is not soaked by the copper ion-containing solution. As can be seen from FIG. 5B, for the signal at 10-4The photoluminescence intensity of the carbon quantum dot hydrogel is basically linearly related to the concentration of the copper ions within the range of the order of mol/L. Thus, for the position 10- 4Copper ions in the order of mol/LThe concentration of the copper ions can be detected by using the fluorescence intensity of the carbon quantum dot hydrogel.
Fig. 6 is a flow chart illustrating a method of making a carbon quantum dot hydrogel according to some embodiments of the present disclosure. As shown in fig. 6, the preparation method may include steps S602 to S608.
In step S602, agarose powder is mixed with deionized water, stirred uniformly, and heated to form a first solution. The agarose can be used as a hydrogel matrix material and a carbon source for forming carbon quantum dots.
The heating method may be electric heating, electromagnetic heating, water bath heating, oil bath heating, or the like, and for example, electromagnetic induction heating may be used to achieve sufficiently uniform heating.
In some embodiments, a first microwave heating is employed to form the first solution. In the first microwave heating, the microwave power may range from 500 watts to 650 watts, and the heating time may range from 0.5 minutes to 1 minute.
For example, the mixture of agarose powder and deionized water may be heated at 500W microwave power for 1 minute, which results in a uniform, transparent first solution.
In step S604, an amino compound is added to the first solution and stirred to form a second solution. For example, the carbon quantum dots may include a carbon core and an organic functional group on the surface of the carbon core. By adding the amino compound to the first solution, an organic functional group can be formed on the surface of the carbon core, and nitrogen element can be introduced. In addition, the amino compound can also play a role in passivating the surface of the carbon core and enhancing the fluorescence property.
In some embodiments, the amino compound may comprise a polyamino compound. For example, the polyamino compound may include ethylenediamine, and the like. For example, ethylenediamine may be added dropwise to the first solution and stirred uniformly to form a transparent second solution.
In step S606, the second solution is heated to form a third solution.
The heating method may be electric heating, electromagnetic heating, water bath heating, oil bath heating, or the like, and for example, electromagnetic induction heating may be used to achieve sufficiently uniform heating.
In some embodiments, a second microwave heating is employed to form a third solution. In the second microwave heating, the microwave power may range from 700 watts to 750 watts, and the heating time may range from 1 minute to 4 minutes. For example, the second solution is heated at 700 watts of microwave power for 1.5 minutes (or 2 minutes, 3 minutes, 4 minutes) to form a brown or reddish brown and transparent third solution.
In step S608, the third solution is cooled to form the carbon quantum dot hydrogel.
For example, the step S608 may include: and injecting the third solution into a mold (such as a polymethyl methacrylate mold) and naturally cooling to form the carbon quantum dot hydrogel. The carbon quantum dot hydrogel is a transparent gel.
Wherein, the natural cooling can be heat exchange with the environment by means of heat conduction, natural convection, radiation and the like so as to reduce the temperature.
In some embodiments, the natural cooling may be cooling at room temperature (18 ℃ -25 ℃) in an open air environment.
To this end, methods of making carbon quantum dot hydrogels according to some embodiments of the present disclosure are provided. In the preparation method, agarose is selected as a carbon source, an amino compound is a nitrogen source (can be used as a surface passivator), deionized water is used as a medium, and the carbon quantum dot hydrogel is formed by a microwave-assisted hydrothermal method. In the preparation method, agarose undergoes a series of physicochemical reactions such as dehydration, crosslinking and carbonization under the condition of microwave heating, thereby forming carbon quantum dots with rich amino groups on the surface. In the microwave reaction process, the carbon quantum dots participate in the cross-linking reaction of the agarose in situ, so the carbon quantum dots can be bonded in the reticular structure of the agarose. The preparation method can realize the in-situ formation of the carbon quantum dot hydrogel. The preparation method has the advantages of short time, quick reaction, easy implementation and low cost.
In some embodiments, the agarose, the amino compound, and the deionized water are mixed in a ratio of 1: (0.8-2.5): (30-50).
For example, the specific ingredients may be: 0.5g of agarose, 0.5mL of ethylenediamine and 20mL of deionized water. Of course, the scope of the embodiments of the present disclosure is not limited to the raw material ratios described herein. For example, water may be 18mL, 30mL, etc., and ethylenediamine may be 1.0mL, 1.5mL, etc.
In some embodiments, the ratio of agarose, amino compound, and deionized water is 1:1: 40.
In some embodiments, the preparation method may further comprise: the carbon quantum dot hydrogel was soaked in deionized water to dialyze the carbon quantum dot hydrogel, thereby removing the residue. For example, unreacted amino compound (e.g., ethylenediamine) and/or non-immobilized carbon quantum dots, and the like, may be removed.
In an embodiment of the present disclosure, a method for detecting copper ions may also be provided. The method can comprise the following steps: copper ions were detected using a carbon quantum dot hydrogel as described previously. The carbon quantum dot hydrogels of the embodiments of the present disclosure exhibit sensitivity to copper ions. For example, the carbon quantum dot hydrogel can be used to monitor the copper ion concentration in an aqueous environment in conjunction with fluorescence spectrometer analysis.
Fig. 7 is a flow chart illustrating a method for detecting copper ions according to some embodiments of the present disclosure. Here, copper ions were detected using a carbon quantum dot hydrogel. As shown in fig. 7, the method may include steps S702 to S708.
In step S702, the carbon quantum dot hydrogel is soaked in the liquid to be detected.
In step S704, the carbon quantum dot hydrogel is taken out of the liquid, and the fluorescence intensity of the carbon quantum dot hydrogel is detected.
In step S706, the detected fluorescence intensity is compared with the fluorescence intensity of the carbon quantum dot hydrogel without being soaked in the liquid.
In step S708, if the detected fluorescence intensity is weaker than that of the carbon quantum dot hydrogel in the case where the liquid is not soaked, it is determined that the liquid contains copper ions.
To this end, methods for detecting copper ions according to some embodiments of the present disclosure are provided. Here, copper ions were detected using a carbon quantum dot hydrogel. And if the fluorescence intensity detected by the carbon quantum dot hydrogel after being soaked in the liquid to be detected is less than the fluorescence intensity of the carbon quantum dot hydrogel under the condition that the carbon quantum dot hydrogel is not soaked in the liquid, determining that the liquid contains copper ions. This enables detection of copper ions. The detection method is rapid, simple, easy to implement and low in cost. By detecting the copper ions, the method has good application value for protecting the environment or maintaining the human health and the like.
Furthermore, in the previous analysis, the carbon quantum dot hydrogel was detected at a concentration of 10-6mol/L of copper ions, so the detection method has the advantage of high sensitivity.
In some embodiments, the degree of decrease in the detected fluorescence intensity is directly related to the concentration of copper ions contained in the liquid. That is, the more the fluorescence intensity detected by the carbon quantum dot hydrogel after being soaked in the liquid to be detected is reduced than that in the case of not being soaked in the liquid, the greater the concentration of copper ions contained in the liquid is indicated.
In some embodiments, the method for detecting copper ions may further include: the concentration of copper ions contained in the liquid is determined based on the degree of decrease in the intensity of the detected fluorescence.
For example, for the position at 10-4The fluorescence intensity of the carbon quantum dot hydrogel is linearly related to the concentration of the copper ions within the order of mol/L.
For example, at least (0, 5X 10)-4]The copper ion concentration of mol/L is in a range with good linear relation.
Thus, for the position 10-4The concentration of the copper ions in the order of mol/L can be detected by utilizing the degree of the reduction of the fluorescence intensity of the carbon quantum dot hydrogel.
Thus, various embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims (11)

1. A method for detecting copper ions, comprising: detecting copper ions by using a carbon quantum dot hydrogel prepared by the preparation method described below;
wherein the preparation method comprises the following steps: mixing agarose powder with deionized water, uniformly stirring, and heating to form a first solution;
adding an amino compound into the first solution, and uniformly stirring to form a second solution, wherein the raw material ratio of the agarose, the amino compound and the deionized water is 1: (0.8-2.5): (30-50), the amino compound is ethylenediamine;
heating the second solution to form a third solution; and
cooling the third solution to form a carbon quantum dot hydrogel;
wherein the heating is microwave heating; performing a first microwave heating to form a first solution, wherein the microwave power ranges from 500 watts to 650 watts, and the heating time ranges from 0.5 minutes to 1 minute; a second microwave heating is performed to form a third solution, the microwave power ranging from 700 watts to 750 watts, and the heating time ranging from 1 minute to 4 minutes.
2. The method of claim 1, wherein the step of detecting copper ions using the carbon quantum dot hydrogel comprises:
soaking the carbon quantum dot hydrogel into a liquid to be detected;
taking out the carbon quantum dot hydrogel from the liquid, and detecting the fluorescence intensity of the carbon quantum dot hydrogel; and
comparing the detected fluorescence intensity with the fluorescence intensity of the carbon quantum dot hydrogel without being soaked in the liquid, and determining that the liquid contains copper ions if the detected fluorescence intensity is weaker than the fluorescence intensity of the carbon quantum dot hydrogel without being soaked in the liquid.
3. The method of claim 2, wherein,
the degree of decrease in the detected fluorescence intensity is positively correlated with the concentration of copper ions contained in the liquid.
4. The method of claim 3, further comprising:
determining the concentration of copper ions contained in the liquid based on the degree of decrease in the intensity of the detected fluorescence.
5. The method of claim 3, wherein,
for in 10-4The fluorescence intensity of the carbon quantum dot hydrogel is linearly related to the concentration of the copper ions within the order of mol/L.
6. The method of claim 1, wherein the method of making further comprises:
soaking the carbon quantum dot hydrogel in deionized water to dialyze the carbon quantum dot hydrogel, thereby removing residues.
7. The method of claim 1, wherein,
the mass ratio of the raw materials of the agarose, the amino compound and the deionized water is 1:1: 40.
8. The method of claim 1, wherein the step of cooling the third solution to form a carbon quantum dot hydrogel comprises:
and injecting the third solution into a mold, and naturally cooling to form the carbon quantum dot hydrogel.
9. The method of claim 1, wherein the carbon quantum dot hydrogel comprises:
the carbon quantum dots are bonded in the reticular structure of the agarose hydrogel.
10. The method of claim 9, wherein the carbon quantum dots have a diameter ranging from 1nm to 10 nm.
11. The method of claim 9, wherein the carbon quantum dots are aminated carbon quantum dots.
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