CN108918613A - Based on gold nanoparticle/graphite alkene/chitosan trace cadmium ion electrochemical sensor, preparation method and its usage - Google Patents
Based on gold nanoparticle/graphite alkene/chitosan trace cadmium ion electrochemical sensor, preparation method and its usage Download PDFInfo
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- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
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- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
- G01N27/38—Cleaning of electrodes
Abstract
The present invention provides a kind of based on gold nanoparticle/graphite alkene/chitosan trace cadmium ion electrochemical sensor preparation method.Gold nanoparticle, cadmium ion, graphene and chitosan are co-deposited to glassy carbon electrode surface using the method for electrochemical deposition by the present invention, modified glassy carbon electrode is crosslinked using sodium tripolyphosphate, cadmium ion trace sensor is then afforded by acetone/water mixed solvent, disodium ethylene diamine tetra-acetic acid solution.The ion blotting sensor of acquisition shows excellent selectivity and sensitivity to cadmium ion, and reusable multiple, stability with higher.Cadmium ion trace electrochemical sensor of the present invention have the advantages that simple preparation condition, easy to operate, low in cost, environmentally protective, high sensitivity and strong antijamming capability, it can be achieved that in water environment cadmium ion efficient real-time detection.
Description
Technical field
The present invention relates to a kind of based on gold nanoparticle/graphite alkene/chitosan trace cadmium ion electrochemical sensor system
Preparation Method belongs to nano-functional material and electrochemical sensor technology field.
Background technique
Cadmium is human body non-essential element, is often existed in nature with compound state, and content is very low, and cadmium content is lower than in atmosphere
0.003μg/m3, 10 μ g/L are no more than in water, are no more than 0.5mg/kg in soil, in the case of normal environment, will not influence human body
Health.But after environment is by cadmium pollution, it can be caused damages by the amplification of food chain to people and biology.Cadmium pollution master
It will be from metallurgy, smelting, electroplating industry and chemical industry (such as battery, plastic additive, insecticide, pigment) " three wastes "
Discharge accumulates in the soil around factory such as the diffusion of cadmium industrial waste gas and natural subsidence, the cadmium concentration in soil can be made to reach
40ppm, then crops are polluted by approach such as irrigation, plantations.In addition, cadmium can enter food by the cultivation of aquatile, it is raw
Object enrichment can make the content of cadmium in marine product be 4500 times of seawater.Into the cadmium of human body, cadmium sulfoprotein is formed in vivo,
Reach whole body by blood, and be selectively accumulated in kidney, in liver, thus influence liver, in kidney organ enzyme system normal function
Can, keep the growth metabolism of bone interrupted, causes skeleton bulking, atrophy, deformation etc..Therefore, cadmium ion in water environment is specified to contain
Amount is of great significance to protection human health.
Relative to traditional ion analysis method, there is electrochemical sensor apparatus to be miniaturized, is easy to operate, be not necessarily to
The advantages such as automation and continuous analysis are convenient in complicated pre-treatment, possess crucially in water quality Analysis of Heavy Metal Ions field
Position and wide application prospect.Electrochemical sensor is the electrochemical properties and its changing rule according to substance in solution, is established
On with the basis of the quantitative relation between the electric signals such as conductance, current potential, electric current and measured matter content, component is determined
Property and quantitative instrument analytical method.Currently, it is needed with the sensitivity of electrochemical sensor detection cadmium ion and accuracy
It further increases.Wherein, it selects suitable decorative material and method of modifying is the key that solve the problems, such as this.
Summary of the invention
The object of the present invention is to provide one kind to be based on gold nanoparticle/graphite alkene/Chitosan Composites efficient detection cadmium
Electrochemical sensor of ion and preparation method thereof, the cadmium that the preparation method is simple, operation is simple, low in cost, prepared
Ion electrochemical sensor can cadmium ion in rapid quantitative detection water environment, under the conditions of existing for the interfering ion, sensor
Excellent selectivity is shown to cadmium ion, has the characteristics that high sensitivity, stability is good and strong antijamming capability, is pacified in food
Entirely, drug administers control and environmental monitoring field has potential application.
Above-mentioned purpose is achieved through the following technical solutions：
It is a kind of based on gold nanoparticle/graphite alkene/chitosan trace cadmium ion electrochemical sensor preparation method, it is special
Sign is, includes the following steps：
(1) pretreatment of glass-carbon electrode
Glass-carbon electrode is mechanically polished to smooth mirror surface, and with being dried with nitrogen after being cleaned by ultrasonic, then glass-carbon electrode is carried out
Activation；
(2) preparation of nano-Au solution
Three-necked flask is impregnated using chloroazotic acid, successively cleans with deionized water, ultrapure water, and dries；It is by 100mL concentration
0.01 wt.%-0.03wt.% chlorauric acid solution is placed in three-necked flask, magnetic agitation, and it is yellow that heating, which boils 10min to solution,
Brown, then it is 1wt.%-3wt.% sodium citrate solution that 2-8mL concentration, which is added, into the solution of boiling, solution becomes deep at this time
Blue continues to boil 10min, and solution colour gradually becomes shallower as, and then stops heating, obtains the nanogold of claret after room temperature is cooling
Solution；
(3) preparation of cadmium ion trace electrochemical sensor
1-5g chitosan is dissolved in 1-5vt.% dilute acetic acid solution, chitosan solution is configured to, is separately added into step (2)
Obtained nano-Au solution 10-40mL, 0.03-0.15g divalent cadmium ion and 1-5mL graphene dispersing solution, magnetic agitation are mixed
It closes and uniformly obtains 100mL deposition liquid, using three-electrode system, using platinum electrode as auxiliary electrode, the pretreated glass carbon electricity of step (1)
Extremely working electrode, saturation Ag/AgCl are reference electrode, will deposit the blending in liquid at room temperature in -1.2V using potentiostatic method
Object is deposited on glassy carbon electrode surface, sedimentation time 60-240s；
Modified glassy carbon electrode obtained is placed in sodium tripolyphosphate solution and is crosslinked 1-3h, it is mixed with acetone/water after taking-up
Modified electrode after washing, is then placed in disodium ethylene diamine tetra-acetic acid solution and elutes cadmium ion, when elution by bonding solvent washing
Between be 1-3h, then distill water washing it is dry after obtain gold nanoparticle/graphite alkene/chitosan trace sensor.
Further, in step (1), the activation in the step (1) is that glass-carbon electrode glass-carbon electrode is molten in electrolyte
Cyclic voltammetry scan is carried out in liquid obtains cyclic voltammetric peak that will definitely be inverse.
Further, the electrolyte solution is 0.5mol/L H2SO4Or the 5mmol/L K containing 0.2mol/L KCl3
[Fe(CN)6] solution；Cyclic voltammetry scan speed is 100mV/s, scanning range -0.3~+1.5V；It will definitely inverse cyclic voltammetric peak：
Peak current ratio is 1：1, spike potential difference is less than 90mV.
Further, in step (2), the concentration of chlorauric acid solution is 0.02wt.%；The concentration of sodium citrate solution is
2wt.%.
Further, in step (3), the spirit of vinegar concentration is 1-3%；The composition of the deposition liquid：Chitosan 0.5-
2wt.%, nano-Au solution 20-30vt.%, divalent cadmium ion 0.03-0.1g, graphene 0.005-0.01wt.%；Described two
Valence cadmium ion is from caddy, cadmium sulfate, cadmium nitrate or cadmium acetate.
Further, the electrodeposition time is 120~240s；The voltage of potentiostatic method is -1~-1.4V；The trimerization
Phosphoric acid na concn is 0.1mol/L, crosslinking time 1-3h；The disodium ethylene diamine tetra-acetic acid solution concentration is 0.5mol/L, is washed
The de- time is 2~4h.
Gold nanoparticle/graphite alkene/chitosan trace cadmium ion electrochemical sensor of the preparation method preparation.
The gold nanoparticle/graphite alkene/chitosan trace cadmium ion electrochemical sensor, the inspection for cadmium ion
It surveys.
Chitosan is that unique natural alkalinity for finding so far is more as the second largest natural polymers of nature
Sugar, amino and hydroxyl rich in strand, the work that enrichment can be made it have with metal ion-chelant, adsorbs heavy metal
With as electrode modified material with significant advantage.Currently, multiplexed combination modified electrode can more show to be different from single repair
Had collaboration and coupling effect are adornd, better than one pack system modification electricity in sensitivity, selectivity, reproducibility and stability
Pole.Nano material especially c-based nanomaterial and metal nano material, due to exclusive small-size effect, surface effect
It answers, quantum size effect, macro quanta tunnel effect and Dielectric confinement effect, has been widely applied to chemistry and bio-sensing
Device constructs aspect.As gold nanoparticle can be in conjunction with a variety of large biological molecules, and the bioactivity of large biological molecule is not influenced,
It has broad application prospects in bio-sensing field.Graphene is as a kind of novel carbon-based material with two-dimensional structure, tool
There are bigger specific surface area and high electronic conduction ability, is the ideal electrode decorative material in electrochemical sensor field.
Therefore, the advantages of present invention combination chitosan, gold nanoparticle and graphene, Measurement of Biopolymer Chitosan knot is utilized
Compound/carbon nano material, graphene and gold nano grain electroplating deposition collectively constitute compound ulcer matrix in glassy carbon electrode surface,
The ion blotting hole with three-dimensional structure is constructed in modification film surface with EDTA solution with after sodium tripolyphosphate crosslinking,
The ion blotting sensor that there is specific recognition to cadmium ion is made.Gold nanoparticle/graphite is prepared by one-step method electro-deposition
Alkene/chitosan trace cadmium ion electrochemical sensor.Gold nanoparticle/graphite alkene of the invention/chitosan trace cadmium ion electricity
The preparation method of chemical sensor is simple, operation is simple, low in cost.
The gold nanoparticle/graphite alkene/chitosan trace cadmium ion electrochemical sensor, can be used for water environment and food
The detection of middle cadmium ion has the characteristics that preparation is simple, high sensitivity, stability are good and strong antijamming capability.Water ring can be achieved
The rapid quantitative detection of cadmium ion in border, administering control and environmental monitoring field in food safety, drug has potential application
Value.It is 1.0 × 10 that it, which detects the range of linearity,-8mol/L-9.0×10-7Mol/L and 3.0 × 10-5mol/L-4.0×10-4mol/
L, Monitoring lower-cut are 1.62 × 10-10mol/L.Under the conditions of existing for the interfering ion, sensor shows cadmium ion excellent
Selectivity, reuse 100 times after, detection performance is still able to maintain original 80%, to tap water, river water and plain chocolate etc.
The rate of recovery of sample detection is respectively 98.5%-102.12%, 98.62%-102.64% and 99-109.2%.
Detailed description of the invention
(a) is the transmission electron microscope picture of gold nanoparticle prepared by 1 step of embodiment (2) in Fig. 1, (b) is prepared
Gold nanoparticle/graphite alkene/chitosan trace cadmium ion electrochemical sensor surface scan electromicroscopic photograph.
Fig. 2 is the linear relationship chart of the sensor DPV response peak current strength and Cd (II) concentration.
(a), (b) (c) are respectively specificity, repeatability and stability test knot of the sensor to cadmium ion in Fig. 3
Fruit.
Specific embodiment
Present invention will be further explained with reference to the attached drawings and specific examples, but protection scope of the present invention is simultaneously
It is without being limited thereto.
Using Measurement of Biopolymer Chitosan combination carbon nanomaterial, graphene and gold nano grain electroplating deposition in glass carbon electricity
Pole surface collectively constitutes compound ulcer matrix, has with EDTA solution in modification film surface building with after sodium tripolyphosphate crosslinking
There is the ion blotting hole of three-dimensional structure, the ion blotting sensor that there is specific recognition to cadmium ion is made.
Embodiment 1
(1) by diameter 3mm glass-carbon electrode Al2O3Powder is mechanically polished to smooth mirror surface, then super with secondary distilled water
Sound cleaning, each 3min, in triplicate.Clean electrode uses dehydrated alcohol, secondary distilled water ultrasonic cleaning 5min again, uses nitrogen
Drying.By the glass-carbon electrode handled well in 0.5mol/L H2SO4Cyclic voltammetry scan, scanning speed 100 are carried out in solution
MV/s, scanning range -0.3-+1.5V, obtain cyclic voltammetric peak that will definitely be inverse, and peak current ratio is 1：1, spike potential difference is less than 90
MV, the i.e. cleaning of completion electrode, activation process.
(2) three-necked flask is impregnated using chloroazotic acid, is rinsed well flask with a large amount of deionized waters, then elute 3 with ultrapure water
It is secondary, it is inverted drying.100mL 0.02wt.% chlorauric acid solution is placed in 250mL three-necked flask, magnetic agitation, heating is boiled
10min is yellowish-brown, then the addition 5mL 2wt.% sodium citrate solution into the solution of boiling to solution, and solution becomes at this time
Navy blue continues to boil 10min, and solution colour gradually becomes shallower as, and then stops heating, obtains the nanometer of claret after room temperature is cooling
Gold solution, gold nano grain obtained is in spherical, diameter 10-20nm, as shown in figure 1 shown in (a).
(3) chitosan is dissolved in 1vt.% dilute acetic acid solution, prepares the poly- 97mL chitosan solution of shelling, is separately added into
The obtained nano-Au solution of 25mL step (2), 0.05g divalent cadmium ion and 2mL 0.4wt.% graphene dispersing solution, magnetic force
It is uniformly mixed to obtain 100mL deposition liquid, using three-electrode system, using platinum electrode as auxiliary electrode, the glass of step (1) preparation
Carbon electrode is working electrode, saturation Ag/AgCl be reference electrode, using potentiostatic method -1.2V at room temperature will be in electrolyte
Blend is deposited on glassy carbon electrode surface, sedimentation time 180s.Modified glassy carbon electrode obtained is placed in the three of 0.1mol/L
It is crosslinked in polyphosphate sodium solution, is washed after taking-up with acetone/water mixed solvent.Then the modified electrode after washing is placed in
2h is eluted in 0.5mol/L disodium ethylene diamine tetra-acetic acid solution, removes removing template cadmium ion, is obtained after then distilling water washing drying
Gold nanoparticle/graphite alkene/chitosan trace sensor.
Testing result of the sensor in actual sample is listed in table 1, the results showed that the sensor has excellent reality
Border sample detection ability.
Testing result of 1 sensor of table in actual sample
(b) illustrates the scanning electron microscope (SEM) photograph of glassy carbon electrode surface electro-deposition composite material in Fig. 1, observes from Fig. 1 (b)
Glassy carbon electrode surface electro-deposition composite material surface has three-dimensional porous structure.
Fig. 2 is the result shows that the peak current of cadmium ion increases with its concentration and increased, 1.0 × 10-8mol/L-9.0×10- 7Mol/L and 3.0 × 10-5mol/L-4.0×10-4Peak current is with the logarithm of its concentration in good in mol/L concentration range
Linear relationship, linear equation ip=0.04775+0.288c (R2=0.999) and ip=4.65+0.22c (mol/L) (R2=
0.9956), concentration of the c for cadmium ion, i in the equationpThe reduction peak current value obtained for differential pulse voltammetry.Detection limit is logical
Formula DOL=3 δ/K calculating is crossed, wherein δ is the standard deviation of blank sample, and the slope of K calibration curve, being computed can must detect down
It is limited to 1.62 × 10-10mol/L。
Embodiment 2
(1) by diameter 3mm glass-carbon electrode Al2O3Powder is mechanically polished to smooth mirror surface, then super with secondary distilled water
Sound cleaning, each 3min, in triplicate.Clean electrode uses dehydrated alcohol, secondary distilled water ultrasonic cleaning 5min again, uses nitrogen
Drying.By the glass-carbon electrode handled well in 5mmol/L K3[Fe(CN)6] cyclic voltammetry scan is carried out in solution, scanning speed is
100mV/s, scanning range -0.3-+1.5V, obtain cyclic voltammetric peak that will definitely be inverse, and peak current ratio is 1：1, spike potential difference is less than
90mV, the i.e. cleaning of completion electrode, activation process.
(2) three-necked flask is impregnated using chloroazotic acid, is rinsed well flask with a large amount of deionized waters, then elute 3 with ultrapure water
It is secondary, it is inverted drying.0.02wt.%100mL chlorauric acid solution is placed in 250mL three-necked flask, magnetic agitation, heating is boiled
10min is yellowish-brown, then the addition 5mL 2wt.% sodium citrate solution into the solution of boiling to solution, and solution becomes at this time
Navy blue continues to boil 10min, and solution colour gradually becomes shallower as, and then stops heating, obtains the nanometer of claret after room temperature is cooling
Gold solution.
(3) chitosan is dissolved in 1vt.% dilute acetic acid solution, is configured to 97mL chitosan solution, be separately added into 30mL step
Suddenly (2) obtained nano-Au solution, 0.06g divalent cadmium ion and 2mL0.4wt.% graphene dispersing solution, magnetic agitation mixing
100mL deposition liquid is uniformly obtained, using three-electrode system, using platinum electrode as auxiliary electrode, the glass-carbon electrode of step (1) preparation is
Working electrode, saturation Ag/AgCl are reference electrode, and the blend in electrolyte is sunk at room temperature in -1.2V using potentiostatic method
Product is in glassy carbon electrode surface, sedimentation time 200s.Modified glassy carbon electrode obtained is placed in the sodium tripolyphosphate of 0.1mol/L
It is crosslinked in solution, is washed after taking-up with acetone/water mixed solvent.Then the modified electrode after washing is placed in 0.5mol/L second two
1h is eluted in amine tetraacethyl disodium solution, removes removing template cadmium ion, obtains gold nanoparticle/stone after then distilling water washing drying
Black alkene/chitosan trace sensor.
(a) shows in the case where Zn (II), Co (II), Cu (II), Ni (II) and mol/Ln (II) coexist in Fig. 3, should
Sensor shows excellent selectivity to Cd (II).(b) is acted in 0.1mol/L disodium ethylene diamine tetra-acetic acid solution in Fig. 3
Under, after being combined 100 times by elution-, 100 μm of ol/LCr (VI) are detected, sensor still has 80% initial electrochemistry
Performance.Fig. 3 (c) saves sensor 30 days under the conditions of 4 DEG C, 0.1mol/L hac buffer, and DPV test result shows
It still maintains 91% initial communication intensity, with good stability.
Embodiment 3
(1) by diameter 3mm glass-carbon electrode Al2O3Powder is mechanically polished to smooth mirror surface, then super with secondary distilled water
Sound cleaning, each 3min, in triplicate.Clean electrode uses dehydrated alcohol, secondary distilled water ultrasonic cleaning 5min again, uses nitrogen
Drying.By the glass-carbon electrode handled well in 0.5mol/L H2SO4Cyclic voltammetry scan, scanning speed 100 are carried out in solution
MV/s, scanning range -0.3-+1.5V, obtain cyclic voltammetric peak that will definitely be inverse, and peak current ratio is 1：1, spike potential difference is less than 90
M, the i.e. cleaning of completion electrode, activation process.
(2) three-necked flask is impregnated using chloroazotic acid, is rinsed well flask with a large amount of deionized waters, then elute 3 with ultrapure water
It is secondary, it is inverted drying.0.03wt.%100mL chlorauric acid solution is placed in 250mL three-necked flask, magnetic agitation, heating is boiled
10min is yellowish-brown, then the addition 5mL 2.5wt.% sodium citrate solution into the solution of boiling to solution, and solution becomes at this time
For navy blue, continue to boil 10min, solution colour gradually becomes shallower as, and then stops heating, obtains receiving for claret after room temperature is cooling
Rice gold solution.
(3) chitosan is dissolved in 1vt.% dilute acetic acid solution, is configured to 97mL chitosan solution, be separately added into 35mL step
Suddenly (2) obtained nano-Au solution, 0.06g divalent cadmium ion and 2mL 0.4wt.% graphene dispersing solution, magnetic agitation are mixed
It closes and uniformly obtains 100mL deposition liquid, using three-electrode system, using platinum electrode as auxiliary electrode, the glass-carbon electrode of step (1) preparation
For working electrode, saturation Ag/AgCl is reference electrode, using potentiostatic method in -1.2V at room temperature by the blend in electrolyte
It is deposited on glassy carbon electrode surface, sedimentation time 180s.Modified glassy carbon electrode obtained is placed in the tripolyphosphate of 0.1mol/L
It is crosslinked in sodium solution, is washed after taking-up with acetone/water mixed solvent.Then the modified electrode after washing is placed in 0.5mol/L
2h is eluted in disodium ethylene diamine tetra-acetic acid solution, removes removing template cadmium ion, obtains Jenner's grain of rice after then distilling water washing drying
Son/graphene/chitosan trace sensor.
The embodiment is a preferred embodiment of the present invention, but present invention is not limited to the embodiments described above, not
In the case where substantive content of the invention, any conspicuous improvement that those skilled in the art can make, replacement
Or modification all belongs to the scope of protection of the present invention.
Claims (8)
1. a kind of based on gold nanoparticle/graphite alkene/chitosan trace cadmium ion electrochemical sensor preparation method, feature
It is, includes the following steps：
(1) pretreatment of glass-carbon electrode
Glass-carbon electrode is mechanically polished to smooth mirror surface, and with being dried with nitrogen after being cleaned by ultrasonic, then glass-carbon electrode is activated；
(2) preparation of nano-Au solution
Three-necked flask is impregnated using chloroazotic acid, successively cleans with deionized water, ultrapure water, and dries；It is by 100mL concentration
0.01wt.%-0.03wt.% chlorauric acid solution is placed in three-necked flask, magnetic agitation, and it is yellow that heating, which boils 10min to solution,
Brown, then it is 1wt.%-3wt.% sodium citrate solution that 2-8mL concentration, which is added, into the solution of boiling, solution becomes deep at this time
Blue continues to boil 10min, and solution colour gradually becomes shallower as, and then stops heating, obtains the nanogold of claret after room temperature is cooling
Solution；
(3) preparation of cadmium ion trace electrochemical sensor
1-5g chitosan is dissolved in 1-5vt.% dilute acetic acid solution, chitosan solution is configured to, is separately added into obtained by step (2)
Nano-Au solution 10-40mL, 0.03-0.15g divalent cadmium ion and 1-5mL graphene dispersing solution arrived, magnetic agitation mixing are equal
Even to obtain 100mL deposition liquid, using three-electrode system, using platinum electrode as auxiliary electrode, step (1) pretreated glass-carbon electrode is
Working electrode, saturation Ag/AgCl are reference electrode, and the blend deposited in liquid is sunk at room temperature in -1.2V using potentiostatic method
Product is in glassy carbon electrode surface, sedimentation time 60-240s；
Modified glassy carbon electrode obtained is placed in sodium tripolyphosphate solution and is crosslinked 1-3h, it is molten with acetone/water mixing after taking-up
Modified electrode after washing, is then placed in disodium ethylene diamine tetra-acetic acid solution and elutes cadmium ion, elution time is by agent washing
1-3h obtains gold nanoparticle/graphite alkene/chitosan trace sensor after then distilling water washing drying.
2. preparation method according to claim 1, which is characterized in that in step (1), the activation in the step (1) is
Glass-carbon electrode glass-carbon electrode is carried out to cyclic voltammetry scan in electrolyte solution and obtains cyclic voltammetric peak that will definitely be inverse.
3. preparation method according to claim 2, which is characterized in that the electrolyte solution is 0.5mol/L H2SO4Or
5mmol/L K containing 0.2mol/L KCl3[Fe(CN)6] solution；Cyclic voltammetry scan speed is 100mV/s, scanning range-
0.3~+1.5V；It will definitely inverse cyclic voltammetric peak：Peak current ratio is 1：1, spike potential difference is less than 90mV.
4. preparation method according to claim 1, which is characterized in that in step (2), the concentration of chlorauric acid solution is
0.02wt.%；The concentration of sodium citrate solution is 2wt.%.
5. preparation method according to claim 1, which is characterized in that in step (3), the spirit of vinegar concentration is 1-3%；
The composition of the deposition liquid：Chitosan 0.5-2wt.%, nano-Au solution 20-30vt.%, divalent cadmium ion 0.03-0.1g, stone
Black alkene 0.005-0.01wt.%；The divalent cadmium ion is from caddy, cadmium sulfate, cadmium nitrate or cadmium acetate.
6. preparation method according to claim 5, which is characterized in that the electrodeposition time is 120~240s；Constant potential
The voltage of method is -1~-1.4V；The tripolyphosphate na concn is 0.1mol/L, crosslinking time 1-3h；The ethylenediamine tetraacetic
Acetic acid disodium solution concentration is 0.5mol/L, and elution time is 2~4h.
7. gold nanoparticle/graphite alkene/chitosan trace cadmium ion electrochemistry of preparation method preparation described in claim 1 passes
Sensor.
8. gold nanoparticle/graphite alkene as claimed in claim 7/chitosan trace cadmium ion electrochemical sensor, for cadmium from
The detection of son.
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| CN110274947A (en) * | 2019-06-09 | 2019-09-24 | 重庆工商大学融智学院 | One kind being based on distributed heterogeneous space-data integration |
| CN114594149A (en) * | 2022-03-04 | 2022-06-07 | 南京子麒舜生物科技有限公司 | Preparation process of metal detector for enzyme-free detection of dopamine |
| CN115290734A (en) * | 2022-08-03 | 2022-11-04 | 云南大学 | Electrochemical detection method for trace As (III) heavy metal |
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