CN107037097B - Multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrode and preparation method thereof - Google Patents
Multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrode and preparation method thereof Download PDFInfo
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Abstract
The present invention provides a kind of multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrodes, including glass-carbon electrode, the surface of the glass-carbon electrode has been sequentially depositing poly- L-Histidine and multi-walled carbon nanotube, the multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrode electro catalytic activity is strong, impedance is small, conducts electricity very well, and has a good application prospect.The present invention also provides the multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrode preparation methods, and this method mild condition is easy to control, are suitble to large-scale production.
Description
Technical field
The present invention relates to a kind of modified glassy carbon electrodes, and in particular, to a kind of multi-walled carbon nanotube/poly- L-Histidine is compound
Material modified glassy carbon electrode and preparation method thereof.
Background technique
Currently, chemically modified electrode emerges one after another in the report of electrochemistry, especially for glass-carbon electrode research especially
It is common.But since the poor electron transmission between reactant of the electrocatalysis characteristic of glass-carbon electrode is less, people are usual
It selects to modify composite material in glassy carbon electrode surface to improve the chemical property of glass-carbon electrode.
Multi-walled carbon nanotube is a kind of novel carbon material, since it has brilliant electric conductivity and good bio-compatible
Property, it is widely used in the preparation of modified electrode.But since multi-walled carbon nanotube has biggish surface tension, make multi wall
The enhancing of carbon nanotube hydrophobicity, is easier to reunite, is unfavorable for it in the modification of electrode surface, is also unfavorable for its advantage after modification
Performance.
Summary of the invention
In view of this, the present invention provide a kind of multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrode and
Preparation method, to solve the above problems.
Specifically, the present invention adopts the following technical scheme that:
A kind of multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrode, including glass-carbon electrode, the glass carbon
The surface of electrode has been sequentially depositing poly- L-Histidine and multi-walled carbon nanotube.
Based on above-mentioned, the multi-walled carbon nanotube/poly- L-Histidine modified electrode effective area is (4~5) × 10- 2cm2。
A kind of preparation method of the multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrode comprising
Following steps:
It prepares poly- L-Histidine modified electrode and poly- L-Histidine is deposited in glassy carbon electrode surface using cyclic voltammetry, be made
Poly- L-Histidine modified electrode；
The surface that multi-walled carbon nanotube suspension is coated on the poly- L-Histidine modified electrode by finished product is prepared, then
It is dry, the multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrode finished product is made.
Based on above-mentioned, the glass-carbon electrode is primary by polishing, polishing, cleaning pretreated bare glassy carbon electrode.
Based on above-mentioned, the glass-carbon electrode is placed in L-Histidine solution, is -1.0~2.0V, scanning in potential range
Under conditions of rate is 0.03~0.09V/s, using 10~20 circle of cyclic voltammetry polymerization, make in the L-Histidine solution
L-Histidine polymerize to form the poly- L-Histidine, and is deposited on the surface of the glass-carbon electrode, and the poly- L-Histidine is made
Modified electrode.
Based on above-mentioned, the L-Histidine solution is that the L-Histidine-PBS that concentration is 0.0020~0.0030mol/L is molten
Liquid, the pH value of the L-Histidine solution are 6.5~7.5.
The preparation step of the L-Histidine solution includes: the L-Histidine for weighing 0.0020~0.0030mol, then plus
Enter the H of 0.5mol/L2SO4Dissolution, the PBS buffer solution for adding pH=6.5~7.5 are settled to 100mL, obtain the L- group
Propylhomoserin solution；Wherein, the PBS buffer solution is the phosphoric acid containing disodium hydrogen phosphate, potassium dihydrogen phosphate, sodium chloride and potassium chloride
Salt buffer solution.
Based on above-mentioned, the concentration of the multi-walled carbon nanotube suspension is 0.2~0.4mg/L.
Based on above-mentioned, the step of multi-walled carbon nanotube suspension includes: to mix multi-walled carbon nanotube and distilled water,
Ultrasonic disperse is uniform, and the multi-walled carbon nanotube suspension is made.
Specifically, the preparation step that concentration is the multi-walled carbon nanotube suspension of 0.2~0.4mg/L includes: to weigh
The multi-walled carbon nanotube of 0.2~0.4mg is added in 3mL secondary distilled water, forms uniform black suspension in 2~4h of ultrasound
Liquid obtains multi-walled carbon nanotube stoste；Then the multi-walled carbon nanotube stoste and suitable secondary distilled water is taken to mix, ultrasound
The multi-walled carbon nanotube suspension that concentration is 0.2~0.4mg/L is made in 1~2h.
Compared with prior art, the present invention has substantive distinguishing features outstanding and marked improvement, and specifically, the present invention mentions
The multi-walled carbon nanotube of confession/poly- L-Histidine composite material modified glassy carbon electrode includes glass-carbon electrode, the table of the glass-carbon electrode
Face has been sequentially depositing poly- L-Histidine and multi-walled carbon nanotube, can effectively increase the active group of electrode surface, improves electrode
Electrocatalysis characteristic；And the impedance of the multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrode is smaller, leads
Electrical property is good, can effectively facilitate the electron transport rate of electrode surface；Meanwhile multi-walled carbon nanotube and poly- L-Histidine deposit
Electric response area can also be increased in glassy carbon electrode surface, promote the electron transmission between reactive material, accelerate electron exchange, increased
Forceful electric power chemical reactivity increases absorption response substance, enhances corresponding response signal；Therefore, the multi-walled carbon nanotube/poly-
L-Histidine composite material modified glassy carbon electrode can be used for measuring hydroquinone and carbendazim, have broad application prospects.
The present invention also provides a kind of multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrode preparation methods, should
Method mainly passes through electro-deposition and cladding process prepares the multi-walled carbon nanotube/poly- L-Histidine composite material modification glass carbon electricity
Pole, preparation condition is mild, and it is easy to control, it is suitable for large-scale production.
Detailed description of the invention
Fig. 1 is the cyclic voltammetry curve figure of Different electrodes detection.
Fig. 2 is the AC impedance figure of Different electrodes.
Fig. 3 is the timing coulomb behavior figure on Different electrodes.
Fig. 4 is Different electrodes quantity of electric charge Q and t1/2Linear dependence figure.
Specific embodiment
Below by specific embodiment, technical scheme of the present invention will be described in further detail.
Embodiment 1
A kind of multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrode, including glass-carbon electrode, the glass carbon
The surface of electrode has been sequentially depositing poly- L-Histidine and multi-walled carbon nanotube.
A kind of preparation method of the multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrode comprising
Following steps:
Pretreatment first polishes glass-carbon electrode on sand paper, then is polished with 0.3 μm of aluminum oxide powder, until institute
Mirror surface is presented in the surface for stating glass-carbon electrode；Then it is cleaned by ultrasonic 2~3min in secondary distilled water, takes out, use secondary distilled water
It rinses, is dried with filter paper, obtain bare glassy carbon electrode；The bare glassy carbon electrode is put into containing 1.0 × 10-3The K of mol/L3Fe
(CN)6With the KNO of 0.1mol/L3Mixed aqueous solution in, under three-electrode system, sweep speed be 0.1V/s, potential range
To survey its cyclic voltammogram under the conditions of -1.2~0.8V；Then observe its volt-ampere curve, if the difference of two peak spike potentials 90mV with
It is interior, illustrate that the surface of the bare glassy carbon electrode has been handled well；The bare glassy carbon electrode is finally taken out, is rushed with secondary distilled water
It washes, filter paper is dried, spare；
Prepare poly- L-Histidine modified electrode by the bare glassy carbon electrode be placed in concentration be 0.0020mol/L, pH be 6.5~
In 7.5 L-Histidine-PBS solution, 10 circle of cyclic voltammetric polymerization makes L-Histidine polymerize to form poly- L-Histidine, and deposit
On the surface of the bare glassy carbon electrode, poly- L-Histidine modified electrode is made；Wherein, potential range is -1.0~2.0V, scanning
Rate is 0.05V/s；
It prepares finished product and the multi-walled carbon nanotube suspension that concentration is 0.3mg/L is coated on the poly- L-Histidine modification
The surface of electrode, is then dried, and the multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrode finished product is made.
Embodiment 2
A kind of multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrode, including glass-carbon electrode, the glass carbon
The surface of electrode has been sequentially depositing poly- L-Histidine and multi-walled carbon nanotube.
A kind of preparation method of the multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrode comprising
Following steps:
Pretreatment first polishes glass-carbon electrode on sand paper, then is polished with 0.3 μm of aluminum oxide powder, until institute
Mirror surface is presented in the surface for stating glass-carbon electrode；Then it is cleaned by ultrasonic 2~3min in secondary distilled water, takes out, use secondary distilled water
It rinses, is dried with filter paper, obtain bare glassy carbon electrode；The bare glassy carbon electrode is put into containing 1.0 × 10-3The K of mol/L3Fe
(CN)6With the KNO of 0.1mol/L3Mixed aqueous solution in, under three-electrode system, sweep speed be 0.1V/s, potential range
To survey its cyclic voltammogram under the conditions of -1.2~0.8V；Then observe its volt-ampere curve, if the difference of two peak spike potentials 90mV with
It is interior, illustrate that the surface of the bare glassy carbon electrode has been handled well；The bare glassy carbon electrode is finally taken out, is rushed with secondary distilled water
It washes, filter paper is dried, spare；
Preparing poly- L-Histidine modified electrode and the bare glassy carbon electrode is placed in concentration is 0.0030mol/L, pH 6.5
In~7.5 L-Histidine-PBS solution, 20 circle of cyclic voltammetric polymerization makes L-Histidine polymerize to form poly- L-Histidine, and sink
Poly- L-Histidine modified electrode is made on the surface of the bare glassy carbon electrode in product；Wherein, potential range is -1.0~2.0V, is swept
Retouching rate is 0.05V/s；
It prepares finished product and the multi-walled carbon nanotube suspension that concentration is 0.4mg/L is coated on the poly- L-Histidine modification
The surface of electrode, is then dried, and the multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrode finished product is made.
Embodiment 3
A kind of multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrode, including glass-carbon electrode, the glass carbon
The surface of electrode has been sequentially depositing poly- L-Histidine and multi-walled carbon nanotube.
A kind of preparation method of the multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrode comprising
Following steps:
Pretreatment first polishes glass-carbon electrode on sand paper, then is polished with 0.3 μm of aluminum oxide powder, until institute
Mirror surface is presented in the surface for stating glass-carbon electrode；Then it is cleaned by ultrasonic 2~3min in secondary distilled water, takes out, use secondary distilled water
It rinses, is dried with filter paper, obtain bare glassy carbon electrode；The bare glassy carbon electrode is put into containing 1.0 × 10-3The K of mol/L3Fe
(CN)6With the KNO of 0.1mol/L3Mixed aqueous solution in, under three-electrode system, sweep speed be 0.1V/s, potential range
To survey its cyclic voltammogram under the conditions of -1.2~0.8V；Then observe its volt-ampere curve, if the difference of two peak spike potentials 90mV with
It is interior, illustrate that the surface of the bare glassy carbon electrode has been handled well；The bare glassy carbon electrode is finally taken out, is rushed with secondary distilled water
It washes, filter paper is dried, spare；
Preparing poly- L-Histidine modified electrode and the bare glassy carbon electrode is placed in concentration is 0.0025mol/L, pH 6.5
In~7.5 L-Histidine-PBS solution, poly- L-Histidine modified electrode is made in 15 circle of cyclic voltammetric polymerization；Wherein, current potential model
It encloses for -1.0~2.0V, sweep speed 0.05V/s；
It prepares finished product and the multi-walled carbon nanotube suspension that concentration is 0.2mg/L is coated on the poly- L-Histidine modification
The surface of electrode, is then dried, and the multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrode finished product is made.
Electrochemical property test
1. cyclic voltammetry curve
With 1 × 10-3The K of mol/L3Fe(CN)6With the KNO of 0.1mol/L3Mixed liquor as background liquid, in CHI660D electricity
Bare glassy carbon electrode, poly- L-Histidine modified electrode, multi-walled carbon nanotube are repaired respectively using cyclic voltammetry on chem workstation
Multi-walled carbon nanotube/poly- L-Histidine composite nanometer material modified electrode that decorations electrode and embodiment 3 provide is scanned, and is obtained
The cyclic voltammetry curve of Different electrodes detection is as shown in Figure 1.Curve a~d is followed successively by the bare glassy carbon electrode, described poly- in Fig. 1
L-Histidine modified electrode, the Multiwalled Carbon Nanotubes Modified Electrode and the multi-walled carbon nanotube/poly- L-Histidine is compound are received
The cyclic voltammetry curve of rice material modified electrode.
As shown in Figure 1, reduction peak current ip=1.338 × 10 of the bare glassy carbon electrode-5, the poly- L-Histidine modification
Reduction peak current ip=1.516 × 10 of electrode-5, the reduction peak current ip=1.764 of the Multiwalled Carbon Nanotubes Modified Electrode
×10-5, the multi-walled carbon nanotube/poly- L-Histidine composite nanometer material modified electrode reduction peak current ip=1.791 ×
10-5, therefore, the multi-walled carbon nanotube/poly- L-Histidine composite nanometer material modified electrode peak current maximum and peak type base
This is symmetrical, it is seen that and this multi-walled carbon nanotube/poly- L-Histidine composite nanometer material modified electrode has good electro catalytic activity,
Electrochemical analysis sensitivity can be significantly improved.
2. AC impedance figure
With 1 × 10-3The Fe (CN) of mol/L6 3-、1×10-3The Fe (CN) of mol/L6 4-, 0.1mol/L KCl mixed liquor
For background liquid, the bare glassy carbon electrode, the poly- L-Histidine modified electrode, the multi-walled carbon nanotube are modified to respectively electric
Multi-walled carbon nanotube/poly- L-Histidine composite nanometer material modified electrode that pole and embodiment 3 provide carries out ac impedance measurement,
The AC impedance figure of different modifying electrode is as shown in Figure 2.Curve a~d is followed successively by the bare glassy carbon electrode, the poly- L- in Fig. 2
Histidine modified electrode, the Multiwalled Carbon Nanotubes Modified Electrode and the multi-walled carbon nanotube/poly- L-Histidine composite Nano
The AC impedance figure of material modified electrode.
As shown in Figure 2, the impedance curve beginning of the bare glassy carbon electrode can show bowed state, this shows the naked glass
Carbon electrode has biggish impedance at work；Compared with the bare glassy carbon electrode, on the poly- L-Histidine modified electrode
Impedance slightly reduce；Impedance on the Glassy Carbon Electrode Modified with Multi-wall Carbon Nanotubes also substantially reduces；The multi-wall carbon nano-tube
The straight state of impedance curve figure on pipe/poly- L-Histidine composite material modified glassy carbon electrode, therefore the multi wall carbon is received
Want small in all pole of other electrodes of mitron/impedance ratio of poly- L-Histidine composite material modified glassy carbon electrode.
3. timing coulomb behavior figure
Containing 1 × 10-4In the iron hydrogenation potassium solution of mol/L, the naked glass carbon electricity is tested respectively using cyclic voltammetry
Multi-walled carbon nanotube/poly- L-Histidine composite nanometer material modified electrode timing coulomb behavior figure that pole and embodiment 3 provide
As shown in Figure 3.Curve a, b are respectively that the bare glassy carbon electrode and the multi-walled carbon nanotube/poly- L-Histidine is compound are received in Fig. 3
The chronocoulogram of rice material modified electrode.From the figure 3, it may be seen that the multi-walled carbon nanotube/poly- L-Histidine composite nano materials
The timing coulomb of modified electrode is significantly less than and the bare glassy carbon electrode timing coulomb.
According to Anson formula:
Q=2nFAcD1/2t1/2π1/2+Qdc+Qds
Wherein A is the effective area of working electrode, and t is the working time, and F is Faraday constant, and c is concentration of substrate, and Qdc is
Electric double layer charge can be eliminated, and Qds is faraday's charge, other symbols have common meaning.
4. the quantity of electric charge Q and t1/2Linearly related figure
Electricity in the bare glassy carbon electrode and the multi-walled carbon nanotube/poly- L-Histidine composite nanometer material modified electrode
Lotus amount Q and t1/2Linearly related figure it is as shown in Figure 4.Curve a, b are respectively the bare glassy carbon electrode and the multi wall carbon in Fig. 4
Nanotube/poly- L-Histidine composite nanometer material modified electrode quantity of electric charge Q and t1/2Linear diagram.The naked glass carbon electricity
The quantity of electric charge Q and t of pole1/2Linearity curve be Q (μ C)=0.305t1/2+0.076；The multi-walled carbon nanotube/poly- L-Histidine
The Q and t of the quantity of electric charge of composite nanometer material modified electrode1/2Linearity curve be Q (μ C)=3.952t1/2-0.373.Therefore, institute
The electrode effective area for stating bare glassy carbon electrode is A=3.235 × 10-3cm2, the multi-walled carbon nanotube/poly- L-Histidine is compound
The effective area of nanometer material modified electrode is A=4.192 × 10-2cm2, compared with the bare glassy carbon electrode, the multi wall carbon
Nanotube/poly- L-Histidine composite nanometer material modified electrode effective area is much larger than the bare glassy carbon electrode.
Above-mentioned electrochemical property test shows multi-walled carbon nanotube provided by the invention/poly- L-Histidine composite Nano material
Material modified electrode has the advantages that electricity reaction effective area is big, resistance is small, conducts electricity very well, electro catalytic activity is strong, application prospect
It is wide.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, it should be understood by those ordinary skilled in the art that: still
It can modify to a specific embodiment of the invention or some technical features can be equivalently replaced；Without departing from this hair
The spirit of bright technical solution should all cover within the scope of the technical scheme claimed by the invention.
Claims (6)
1. a kind of multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrode, including glass-carbon electrode, feature exist
In the surface of the glass-carbon electrode has been sequentially depositing poly- L-Histidine and multi-walled carbon nanotube；
Wherein, the multi-walled carbon nanotube/poly- L-Histidine composite material modified glassy carbon electrode preparation method, including it is following
Step:
Poly- L-Histidine modified electrode is prepared, poly- L-Histidine is deposited in glassy carbon electrode surface using cyclic voltammetry, is made poly-
L-Histidine modified electrode；
Finished product is prepared, multi-walled carbon nanotube and distilled water are mixed, ultrasonic disperse is uniform, multi-walled carbon nanotube suspension is made,
Multi-walled carbon nanotube suspension is coated on to the surface of the poly- L-Histidine modified electrode, then dries, the multi wall is made
Carbon nano-tube/poly L-Histidine composite material modified glassy carbon electrode finished product.
2. multi-walled carbon nanotube according to claim 1/poly- L-Histidine composite material modified glassy carbon electrode, feature exist
In the multi-walled carbon nanotube/poly- L-Histidine modified electrode effective area is (4~5) × 10-2 cm2。
3. multi-walled carbon nanotube according to claim 2/poly- L-Histidine composite material modified glassy carbon electrode, feature exist
In the glass-carbon electrode is successively by the bare glassy carbon electrode of polishing, polishing, cleaning treatment.
4. multi-walled carbon nanotube according to claim 3/poly- L-Histidine composite material modified glassy carbon electrode, feature exist
In described the step of preparing poly- L-Histidine modified electrode includes: that the glass-carbon electrode is placed in L-Histidine solution, in electricity
Position range is -1.0~2.0 V, under conditions of sweep speed is 0.03~0.09 V/s, using cyclic voltammetry polymerization 10~20
Circle, makes the L-Histidine in the L-Histidine solution polymerize to form the poly- L-Histidine, and be deposited on the glass-carbon electrode
Surface, the poly- L-Histidine modified electrode is made.
5. multi-walled carbon nanotube according to claim 4/poly- L-Histidine composite material modified glassy carbon electrode, feature exist
In, the L-Histidine solution be L-Histidine-PBS solution that concentration is 0.0020~0.0030 mol/L, and the L- group
The pH value of propylhomoserin solution is 6.5~7.5.
6. multi-walled carbon nanotube according to claim 5/poly- L-Histidine composite material modified glassy carbon electrode, feature exist
In the concentration of the multi-walled carbon nanotube suspension is 0.2~0.4 mg/L.
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| CN1825105A (en) * | 2006-03-21 | 2006-08-30 | 扬州大学 | Method for preparing carbon nano-tube/poly L-cysteine composite modified glassy carbon electrode |
| CN103645228A (en) * | 2013-11-21 | 2014-03-19 | 首都师范大学 | Electrochemical sensor for detecting bisphenol A, preparation method and application thereof |
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| CN1825105A (en) * | 2006-03-21 | 2006-08-30 | 扬州大学 | Method for preparing carbon nano-tube/poly L-cysteine composite modified glassy carbon electrode |
| CN103645228A (en) * | 2013-11-21 | 2014-03-19 | 首都师范大学 | Electrochemical sensor for detecting bisphenol A, preparation method and application thereof |
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| 聚L-白氨酸－碳纳米管修饰电极同时检测对苯二酚和邻苯二酚;郭宇恒 等.;《分析测试学报》;20140325;第33卷(第3期);319 |
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