CN105891298A - Preparation method and application of repeatedly usable graphene ionic liquid electrode - Google Patents
Preparation method and application of repeatedly usable graphene ionic liquid electrode Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a preparation method and application of a repeatedly usable graphene ionic liquid electrode, and relates to a graphene ionic liquid electrode. The preparation method comprises the following steps: 1) mixing graphene with N-octyl pyridine hexafluorine, and grinding so as to obtain a graphene and ionic liquid mixture; 2) filling the graphene and ionic liquid mixture obtained in the step 1) into an injector, and drying; 3) cooling, subsequently polishing one end of a silicone tube by using pan paper till the surface is smooth and flat, thereby obtaining the repeatedly usable graphene ionic liquid electrode. The repeatedly usable graphene ionic liquid electrode can be applied to bisphenol A detection. The preparation method is relatively simple, the performance is relatively excellent, and application of a carbon paste electrode in constructing an electrochemical sensor is effectively promoted. The repeatedly usable graphene ionic liquid electrode is very applicable to analysis and detection on electric active substances on the surface of an electrode which is easy to passivate.
Description
Technical field
The present invention relates to Graphene ionic liquid electrode, especially relate to a kind of reusable Graphene ionic liquid electrode
Preparation method and application.
Background technology
Electrochemical sensor without enzyme has the advantages such as highly sensitive, easy miniaturization, owing to not using bioactive substance, thus is subject to
The impact of the external environment such as temperature, pH value is less, is the study hotspot in current sensory field.Without enzyme sensor based on electrode material
Interaction between material and detection object, therefore selecting of electrode material and effectively assembling on electrode thereof, greatly affect
Detection performance without enzyme sensor.Traditional modified electrode uses coating method or chemical bonding by some high electroactive materials
Modify at electrode surface, make modified electrode show more preferable electrocatalysis characteristic and higher detection sensitivity.But these are modified
Electrode production process is the most relatively complicated, and electrode surface is non-renewable, modified membrane is easy to fall off, has had a strong impact on sensor
Stability.Carbon paste electrode is to utilize carbon dust and binding agent to be uniformly mixed into pastel, is then plunged in electrode tube or is coated in electricity
Extremely rod surface and the class electrode made.Carbon paste electrode is simple for production, in the case of electrode surface occurs passivation or scratch, logical
Cross friction electrode surface just can be continuing with to smooth.But, the binding agent such as paraffin oil bonding filled in traditional carbon paste electrode
Property is weak, and mechanical performance is particularly poor, and non-conductive, and the electrode surface uniformity coefficient of making is the highest and conducts electricity difference, and its application is subject to
Arrive the biggest restriction.Therefore, select electric conductivity high electrode material good, electroactive and optimize the preparation technology of carbon paste electrode,
It it is the key building high-performance electric chemistry sensor based on carbon paste electrode.
Graphene is the thinnest, the hardest a kind of nano material, in 2004 by the Geim of Manchester university of Britain
Et al. find.Graphene by carbon atom with sp2Hybrid orbital composition hexangle type is the flat film of honeycomb lattice, and only one of which carbon is former
The thickness of sublayer.Owing to having superpower electric conductivity, (under room temperature, electron mobility is up to 200000cm2V-1s-1), the machine of superelevation
Specific surface area (the 2630m of tool intensity and super large2g-1) etc. feature (Dmitry V.Kosynkin et al., Nature, 2009,458,
872-877), Graphene and other nano material compound use, can improve the catalysis activity of material, be current optimal two dimension
One of nano material.Ionic liquid is the ionic compound that a class is made up of organic cation and organic (or inorganic) anion,
Molten point is less than 100 DEG C.Due to have higher ionic conductivity, wider electrochemical window, preferable physical and chemical stability,
The features such as preferable bio-compatibility, ionic liquid has obtained Preliminary Applications in carbon paste electrode.
Bisphenol-A is a kind of environment incretion interferent, and in addition to general toxicity, it also has estrogen effect, can imitate or disturb
Endogenous estrogen, plays estrogenic activity.Bisphenol-A is widely used in food stage packaging material and plastic, these
Employ the packaging material for food of bisphenol-A during using, cleaning, to have bisphenol-A migrate out, cause the dirt of content
Dye, the agricultural product thus caused and food-safety problem receive the extensive concern of people.Bisphenol-A is a kind of electroactive material,
Its content information can be monitored by electrochemical oxidation current intensity.Pan etc. (Daodong Pan et al., Analytica chimica acta,
2015,853:297-302) Graphene and golden nanometer particle are passed through the graphene composite material of series reaction complex functionality,
Modified after being combined with tryrosinase on glass-carbon electrode, it is achieved that the detection to bisphenol-A.In this approach, Graphene
The preparation method of composite is complex, and operating process is loaded down with trivial details, severe reaction conditions；Additionally, due to bisphenol-A is at electrode table
Face has carried out irreversible catalytic oxidation process, defines passivating film at electrode surface so that modified electrode just needs after using once
Again to modify, to bring inconvenience to the subsequent treatment of electrode, detection efficiency is low.Zhou Ling etc. (all tinkling of pieces of jade. bisphenol-A inspection in food
The research [D] of survey novel electrochemical sensor. Zhejiang University, 2014) by graphite powder and OPFP ionic liquid are mixed stone roller
Broken and fill in glass tubing and be compacted, put into 80 DEG C of baking ovens heat and take out after 3min, obtain ionic liquid/graphite electrode, should
Electrode preparation is simple, but Electrochemical results shows, it is the most weak to the electro-catalysis ability of bisphenol-A, its oxidation peak electricity
Position is the highest, about at about 0.78V.Therefore, it is still necessary to the selection of electrode material and the assembling process of electrode are optimized further,
To improve its detection performance to bisphenol-A.
Summary of the invention
It is an object of the invention to provide quick, easy, be applied to the one reusable Graphene ion of bisphenol-A detection
The preparation method of fluid electrode.
Another object of the present invention is to provide described reusable Graphene ionic liquid electrode answering in bisphenol-A detection
With.
The preparation method of described reusable Graphene ionic liquid electrode, comprises the following steps:
1) grind after Graphene and N-octylpyridinium hexafluoro (OPFP) being mixed, obtain Graphene and ionic liquid mixture；
In step 1) in, the mass ratio of described Graphene and N-octylpyridinium hexafluoro can be 1: (1.2～2.4)；Described grinding
Time can be 20min；
2) by step 1) Graphene that obtains and ionic liquid mixture dry in loading syringe；
In step 2) in, described syringe can be cased with silica gel tube；The temperature of described drying can be 75～85 DEG C, preferably 80 DEG C,
The time dried can be 5～11min, preferably 6min；The concrete operations of described drying can be: pushes down silica gel tube with pan paper
One end, and the sample melted in syringe is expressed in silica gel tube, mix by flat extrusion Graphene and ionic liquid with pan paper
Compound, then takes off silica gel tube, inserts copper wire at the silica gel tube other end, and the length of described copper wire can be 4～6cm, preferably 5cm.
3) cooling after, one end pan paper of silica gel tube is polishing to smooth surface smooth, obtain reusable Graphene from
Sub-fluid electrode.
Described reusable Graphene ionic liquid electrode can be in the application during bisphenol-A detects.
Test bisphenol-A electrochemical oxidation behavior on Graphene ionic liquid electrode, and on this basis, optimal inspection condition；
The reusable performance of evaluating graphite alkene ionic liquid electrode and the interelectrode repeatability of different batches.
The present invention use ionic liquid N-octylpyridinium hexafluorophosphate (OPFP) as binding agent, first at carbon paste electrode
Preparation introduces Graphene, by optimizing the preparation condition of carbon paste electrode, obtains the Graphene ionic liquid with high electrochemical activity
Body electrode.
The present invention uses Graphene to be sensing material, and ionic liquid is binding agent, by optimize preparation technology, obtain Graphene from
Sub-fluid electrode, with bisphenol-A for detection object, tests the sensing capabilities of electrode.Test result indicate that, Graphene from
Sub-fluid electrode can promote the electrochemical oxidation of bisphenol-A well, can be used for building bisphenol-A electrochemical sensing sensitive, quick
Device；Graphene ionic liquid electrode has a preferable reusable performance, and same electrode uses the relative standard of 20 times continuously
Deviation is less than 2.1%；Electrode repeatability is high, and the interelectrode relative standard deviation of different batches is less than 4.6%.
The carbon paste electrode that Graphene ionic liquid electrode obtained by the present invention is more traditional, preparation method is the simplest, and performance is more
Superior, effectively facilitate carbon paste electrode application in building electrochemical sensor.
The present invention utilizes the characteristics such as the superpower electric conductivity of Graphene, the mechanical strength of superelevation and extra specific surface area, with ionic liquid
Higher electric conductivity, wider electrochemical window, relatively low fusing point, preferable caking property combine, by grinding-fusing-dress
Fill out-solidify, prepare Graphene ionic liquid electrode.This electrode is owing to employing grapheme material, and electro-chemical activity is high, it is not necessary to
Electrode is carried out moditied processing and is just used directly for the detection of some electroactive materials such as bisphenol-A；Additionally, electrode surface is prone to
Update and process, when sustaining damage or passivation occurs, only electrode need to be carried out simple grinding process, so that it may continue to repeat to make
With.Therefore, prepared Graphene ionic liquid electrode be highly suitable for the analysis of the electroactive material on easy passivated electrodes surface with
Detection.
As can be seen here, the present invention has an advantage highlighted below:
(1) preparation method is simple, quickly, it is not necessary to complicated operating condition or instrument and equipment；
(2) take full advantage of the higher electric conductivity of ionic liquid, wider electrochemical window, relatively low fusing point, preferably bond
The excellent specific properties such as property, make graphene uniform, are dispersed stably in electrode, improve the electric conductivity of electrode；
(3) the superpower electric conductivity of Graphene, superelevation mechanical strength and the characteristic of extra specific surface area have been maximally utilised, greatly
Improve the electric conductivity of electrode, make electrode show good electro-chemical activity in the electrochemical oxidation to bisphenol-A；
(4) electrode surface is easily updated and processes, and has preferable reusable performance, and same electrode uses 20 continuously
Secondary relative standard deviation is less than 2.1%；
(5) the Graphene ionic liquid electrode stability that the present invention obtains is high, favorable reproducibility, graphite prepared by continuous 15 batches
Alkene ionic liquid electrode, its relative standard deviation is less than 4.6%.
Accompanying drawing explanation
Fig. 1 is the Graphene ionic liquid electrode figure prepared.
Fig. 2 is the electrochemical impedance figure of Graphene ionic liquid electrode and glass-carbon electrode.
Fig. 3 is the cyclic voltammetric response curve in Graphene ionic liquid electrode phosphate buffer before and after adding bisphenol-A
Figure.
Fig. 4 is the impact on electrode detection bisphenol-A performance of the Graphene mass ratio with OPFP.
Fig. 5 is the different pH impacts on Graphene ionic liquid electrode detection bisphenol-A.
Fig. 6 is the accumulating potential impact on bisphenol-A oxidation peak current.
Fig. 7 is the enrichment time impact on bisphenol-A oxidation peak current.
Fig. 8 is the Graphene ionic liquid electrode response diagram to variable concentrations bisphenol-A under differential pulse voltammetry.
Fig. 9 is the linear relationship chart of differential pulse voltammetry oxidation peak current and bisphenol A concentration.
Figure 10 is the testing result figure of 20 0.25mM bisphenol-As of same electrode METHOD FOR CONTINUOUS DETERMINATION.
Figure 11 is the Graphene ionic liquid electrode prepared of the continuous 15 batches testing result to 0.25mM bisphenol-A.
Detailed description of the invention
Preparing Graphene ionic liquid electrode according to step described in present invention, wherein, Graphene drastically increases electrode
Electric conductivity, ionic liquid act as the effect of binding agent and stabilizer；Step 2) in grind and must fill after the mixing of two kinds of powder
Divide and uniformly, this is the basis that ensure that and prepare high-performance electrode；Graphene quality accounting in the electrodes is from 0.30～0.425
Time, peak point current accordingly increases, and shows that Graphene quality increase makes that the electron transfer of electrode is accelerated, electro-chemical activity uprises.
When Graphene quality accounting is 0.45, cyclic voltammetric oxidation peak current value starts to reduce.Simultaneously, it has been found that work as Graphene
Accounting raises further, and Graphene and ionic liquid mixture almost solidify, and is difficult to be expressed in silica gel tube, it is difficult to form graphite
Alkene ionic liquid electrode.Therefore step 5) in action that the sample in syringe is expressed in silica gel tube must quickly, accurately,
Otherwise the mixture of Graphene ionic liquid will quickly solidify, thus is difficult to be then transferred in silica gel tube.
The present invention is further illustrated for following example:
Embodiment 1
Get out mortar, silica gel tube (d=2mm), syringe (capacity 2.5mL), copper wire, adhesive tape, pocket knife, ruler
Deng.Weighing Graphene and the solid mixture of OPFP that total amount is 0.40g, wherein Graphene and OPFP mass ratio are 0.3:
0.7, grind 20min after both mix homogeneously.The head of syringe needle tube is cut away a part, only retains about 0.5cm length.
Cut 2.2cm silica gel tube, wrap up in adhesive tape and twine to the most flexible and adhesive tape more than silica gel tube about 0.5cm length, then will
It docks with the head of syringe needle tube, packages.To weigh and in ground blend sample loading syringe, and by institute
Material (with the syringe of silica gel tube, pan paper, copper wire) is had together to put into baking oven, constant temperature 5min at 80 DEG C.At baking oven
In, block the top of silica gel tube with pan paper, and promptly the sample in syringe is expressed in silica gel tube, then by silica gel
Pipe is taken off, and the end being connected with needle tubing inserts copper wire.After room temperature cooling, silica gel tube is not inserted into the top pan paper of copper wire and beats
It is milled to smooth surface smooth, i.e. obtains Graphene ionic liquid electrode.
Embodiment 2
Get out mortar, silica gel tube (d=2mm), syringe (capacity 2.5mL), copper wire, adhesive tape, pocket knife, ruler
Deng.Weighing Graphene and the solid mixture of OPFP that total amount is 0.40g, wherein Graphene and OPFP mass ratio are 0.325:
0.675, grind 20min after both mix homogeneously.The head of syringe needle tube is cut away a part, only retains about 0.5cm long
Degree.Cut 2.2cm silica gel tube, wrap up in adhesive tape and twine to the most flexible and adhesive tape more than silica gel tube about 0.5cm length,
Then it is docked with the head of syringe needle tube, package.To weigh and in ground blend sample loading syringe,
And all material (with the syringe of silica gel tube, pan paper, copper wire) is together put into baking oven, constant temperature 5min at 80 DEG C.
In an oven, block the top of silica gel tube with pan paper, and promptly the sample in syringe is expressed in silica gel tube, then
Being taken off by silica gel tube, the end being connected with needle tubing inserts copper wire.After room temperature cooling, silica gel tube is not inserted into the top of copper wire and claims
It is smooth that amount paper is polishing to smooth surface, i.e. obtains Graphene ionic liquid electrode.
Embodiment 3
Get out mortar, silica gel tube (d=2mm), syringe (capacity 2.5mL), copper wire, adhesive tape, pocket knife, ruler
Deng.Weighing Graphene and the solid mixture of OPFP that total amount is 0.40g, wherein Graphene and OPFP mass ratio are 0.07:
0.65, grind 20min after both mix homogeneously.The head of syringe needle tube is cut away a part, only retains about 0.5cm long
Degree.Cut 2.2cm silica gel tube, wrap up in adhesive tape and twine to the most flexible and adhesive tape more than silica gel tube about 0.5cm length,
Then it is docked with the head of syringe needle tube, package.To weigh and in ground blend sample loading syringe,
And all material (with the syringe of silica gel tube, pan paper, copper wire) is together put into baking oven, constant temperature 5min at 80 DEG C.
In an oven, block the top of silica gel tube with pan paper, and promptly the sample in syringe is expressed in silica gel tube, then
Being taken off by silica gel tube, the end being connected with needle tubing inserts copper wire.After room temperature cooling, silica gel tube is not inserted into the top of copper wire and claims
It is smooth that amount paper is polishing to smooth surface, i.e. obtains Graphene ionic liquid electrode.
Embodiment 4
Get out mortar, silica gel tube (d=2mm), syringe (capacity 2.5mL), copper wire, adhesive tape, pocket knife, ruler
Deng.Weighing Graphene and the solid mixture of OPFP that total amount is 0.40g, wherein Graphene and OPFP mass ratio are 0.375:
0.625, grind 20min after both mix homogeneously.The head of syringe needle tube is cut away a part, only retains about 0.5cm long
Degree.Cut 2.2cm silica gel tube, wrap up in adhesive tape and twine to the most flexible and adhesive tape more than silica gel tube about 0.5cm length,
Then it is docked with the head of syringe needle tube, package.To weigh and in ground blend sample loading syringe,
And all material (with the syringe of silica gel tube, pan paper, copper wire) is together put into baking oven, constant temperature 5min at 80 DEG C.
In an oven, block the top of silica gel tube with pan paper, and promptly the sample in syringe is expressed in silica gel tube, then
Being taken off by silica gel tube, the end being connected with needle tubing inserts copper wire.After room temperature cooling, silica gel tube is not inserted into the top of copper wire and claims
It is smooth that amount paper is polishing to smooth surface, i.e. obtains Graphene ionic liquid electrode.
Embodiment 5
Get out mortar, silica gel tube (d=2mm), syringe (capacity 2.5mL), copper wire, adhesive tape, pocket knife, ruler
Deng.Weighing Graphene and the solid mixture of OPFP that total amount is 0.40g, wherein Graphene and OPFP mass ratio are 0.4:0.6,
20min is ground after both mix homogeneously.The head of syringe needle tube is cut away a part, only retains about 0.5cm length.Cut
Take 2.2cm silica gel tube, wrap up in adhesive tape and twine to the most flexible and adhesive tape more than silica gel tube about 0.5cm length, then by it
Dock with the head of syringe needle tube, package.To weigh and in ground blend sample loading syringe, and will be all
Baking oven together put into by material (with the syringe of silica gel tube, pan paper, copper wire), constant temperature 5min at 80 DEG C.In an oven,
Block the top of silica gel tube with pan paper, and promptly the sample in syringe is expressed in silica gel tube, then silica gel tube is taken
Getting off, the end being connected with needle tubing inserts copper wire.After room temperature cooling, silica gel tube is not inserted into the top pan paper of copper wire and is polishing to
Smooth surface is smooth, i.e. obtains Graphene ionic liquid electrode.
Embodiment 6
Get out mortar, silica gel tube (d=2mm), syringe (capacity 2.5mL), copper wire, adhesive tape, pocket knife, ruler
Deng.Weighing Graphene and the solid mixture of OPFP that total amount is 0.40g, wherein Graphene and OPFP mass ratio are 0.425:
0.575, grind 20min after both mix homogeneously.The head of syringe needle tube is cut away a part, only retains about 0.5cm long
Degree.Cut 2.2cm silica gel tube, wrap up in adhesive tape and twine to the most flexible and adhesive tape more than silica gel tube about 0.5cm length,
Then it is docked with the head of syringe needle tube, package.To weigh and in ground blend sample loading syringe,
And all material (with the syringe of silica gel tube, pan paper, copper wire) is together put into baking oven, constant temperature 5min at 80 DEG C.
In an oven, block the top of silica gel tube with pan paper, and promptly the sample in syringe is expressed in silica gel tube, then
Being taken off by silica gel tube, the end being connected with needle tubing inserts copper wire.After room temperature cooling, silica gel tube is not inserted into the top of copper wire and claims
It is smooth that amount paper is polishing to smooth surface, i.e. obtains Graphene ionic liquid electrode.
Embodiment 7
Get out mortar, silica gel tube (d=2mm), syringe (capacity 2.5mL), copper wire, adhesive tape, pocket knife, ruler
Deng.Weighing Graphene and the solid mixture of OPFP that total amount is 0.40g, wherein Graphene and OPFP mass ratio are 0.45:
0.55, grind 20min after both mix homogeneously.The head of syringe needle tube is cut away a part, only retains about 0.5cm long
Degree.Cut 2.2cm silica gel tube, wrap up in adhesive tape and twine to the most flexible and adhesive tape more than silica gel tube about 0.5cm length,
Then it is docked with the head of syringe needle tube, package.To weigh and in ground blend sample loading syringe,
And all material (with the syringe of silica gel tube, pan paper, copper wire) is together put into baking oven, constant temperature 5min at 80 DEG C.
In an oven, block the top of silica gel tube with pan paper, and promptly the sample in syringe is expressed in silica gel tube, then
Being taken off by silica gel tube, the end being connected with needle tubing inserts copper wire.After room temperature cooling, silica gel tube is not inserted into the top of copper wire and claims
It is smooth that amount paper is polishing to smooth surface, i.e. obtains Graphene ionic liquid electrode.
The Graphene ionic liquid electrode prepared sees Fig. 1；
The electrochemical impedance figure of Graphene ionic liquid electrode and glass-carbon electrode sees Fig. 2, in Fig. 2, and [Fe (CN)6]3-/4-: 5mM；
KCl:0.1M；
Cyclic voltammetric response curve in Graphene ionic liquid electrode phosphate buffer before and after adding bisphenol-A sees figure
3, in figure 3, sweep speed: 50mV s-1；Phosphate buffer: 0.1M, pH 7.0；Bisphenol A concentration: 0.1mM；
Graphene sees Fig. 4 with the mass ratio of OPFP to the impact of electrode detection bisphenol-A performance, in the diagram, and sweep speed:
50mV·s-1；Phosphate buffer: 0.1M, pH 7.0；Bisphenol A concentration: 0.1mM；
Different pH (6.0,6.5,7.0,7.5,8.0,8.5,9.0,9.5,10.0) are to bisphenol-A oxidation peak current and oxidation peak electricity
The impact of position sees Fig. 5, in Figure 5, and sweep speed: 50mV s-1；Bisphenol A concentration: 0.1mM；
Accumulating potential and enrichment time see Fig. 6 and 7, in figs. 6 and 7, scanning speed to the impact of bisphenol-A oxidation peak current
Rate: 50mV s-1；Phosphate buffer: 0.1M, pH 7.0；Bisphenol A concentration: 0.1mM；
Under differential pulse voltammetry, Graphene ionic liquid electrode sees Fig. 8, concentration ladder to the response diagram of variable concentrations bisphenol-A
Degree is from 10 μMs to 500 μMs；Differential pulse voltammetry oxidation peak current sees Fig. 9 with the linear relationship chart of bisphenol A concentration, amplitude:
0.05V, pulse width: 0.05s, pulse period: 0.2s, enrichment time 200s, accumulating potential 0.15V；Phosphate-buffered
Liquid: 0.1M, pH 7.0；Graphene is 4.25:5.75 with the mass ratio of OPFP；
The testing result figure of 20 0.25mM bisphenol-As of same electrode METHOD FOR CONTINUOUS DETERMINATION sees Figure 10, all uses after testing every time
Pan paper draws 8-shaped polishing 300 circle；
Graphene ionic liquid electrode prepared by continuous 15 batches sees Figure 11 to the testing result of 0.25mM bisphenol-A.
Claims (10)
1. the preparation method of a reusable Graphene ionic liquid electrode, it is characterised in that comprise the following steps:
1) grind after Graphene and N-octylpyridinium hexafluoro being mixed, obtain Graphene and ionic liquid mixture；
2) by step 1) Graphene that obtains and ionic liquid mixture dry in loading syringe；
3) cooling after, one end pan paper of silica gel tube is polishing to smooth surface smooth, obtain reusable Graphene from
Sub-fluid electrode.
The preparation method of a kind of reusable Graphene ionic liquid electrode the most as claimed in claim 1, it is characterised in that
Step 1) in, the mass ratio of described Graphene and N-octylpyridinium hexafluoro is 1: (1.2～2.4).
The preparation method of a kind of reusable Graphene ionic liquid electrode the most as claimed in claim 1, it is characterised in that
Step 1) in, the time of described grinding is 20min.
The preparation method of a kind of reusable Graphene ionic liquid electrode the most as claimed in claim 1, it is characterised in that
Step 2) in, described syringe is cased with silica gel tube.
The preparation method of a kind of reusable Graphene ionic liquid electrode the most as claimed in claim 1, it is characterised in that
Step 2) in, the temperature of described drying is 75～85 DEG C, and the time of drying is 5～11min.
The preparation method of a kind of reusable Graphene ionic liquid electrode the most as claimed in claim 5, it is characterised in that institute
The temperature stating drying is 80 DEG C, and the time of drying is 6min.
The preparation method of a kind of reusable Graphene ionic liquid electrode the most as claimed in claim 1, it is characterised in that
Step 2) in, the concrete operations of described drying are: push down one end of silica gel tube with pan paper, and will melt in syringe
Sample is expressed in silica gel tube, with pan paper by flat extrusion Graphene and ionic liquid mixture, then takes off silica gel tube, at silicon
The sebific duct other end inserts copper wire.
The preparation method of a kind of reusable Graphene ionic liquid electrode the most as claimed in claim 7, it is characterised in that institute
State a length of 4～6cm, preferably 5cm of copper wire.
9. the reusable Graphene ionic liquid electrode prepared such as either method in claim 1～8 detects at bisphenol-A
Middle application.
Apply the most as claimed in claim 9, it is characterised in that described application includes bisphenol-A electrochemical sensor.
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| CN109926080A (en) * | 2018-12-04 | 2019-06-25 | 山东科技大学 | A kind of visible light-responded production hydrogen photochemical catalyst GO/SiC/WO3Preparation method and application |
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