Preparation Of Mesoporous Carbon Materials Derived From Biomass And Its Application In Electrochemical Sensor

Mesoporous carbon materials combine the advantages of carbon materials and porous materials,such as good chemical stability,low preparation cost,good electrical conductivity,and a large number of pore structures.These advantages make mesoporous carbon materials attract more and more attention from researchers and are widely used in many research fields.However,there are still some problems in general mesoporous carbon materials,such as harsh preparation conditions and complex preparation process.It hinders the large-scale application of mesoporous carbon materials in more fields.Therefore,it is particularly important to prepare a mesoporous carbon material with simple preparation process,low cost and environmental friendliness.Biomass is an ideal material for carbon precursors of new mesoporous carbon materials with a wide range of sources,cheap and easy to get,and friendly to the environment.The preparation of biomass derived mesoporous carbon materials with biomass as the carbon source is conducive to the potential of practical application of mesoporous carbon materials in different fields.Electrochemical sensor is one of the research hotspots in the field of electroanalytical chemistry.Biomass derived mesoporous carbon materials have the potential to be used in electrochemical sensors because of their characteristics.Therefore,in this paper,the biological mesoporous carbon material was used as the surface modification material of the working electrode to construct the electrochemical sensor,and the electrochemical performance of the biomass-derived mesoporous carbon material was investigated by taking potassium ferricyanide(K3Fe(CN)6),hydrogen peroxide(H2O2)and ascorbic acid(AA)as the target materials.The work is as follows:1.Enoki mushroom Derived Mesoporous Carbon(EDMC)was prepared from common edible fungus Flammulina velutipes as Carbon precursor.By scanning electron microscope(SEM),transmission electron microscope(TEM),X-ray diffraction spectrum(XRD),nitrogen adsorption stripping line,X-ray photoelectron spectroscopy(XPS),and other technical means for the preparation of EDMC were characterized,and the results showed that EDMC is a kind of mesoporous materials,the specific surface area of 268.07 m2 g-1,aperture distribution in 2 and 4 nm,with larger specific surface area.The value of its ID/IG is 2.49,Higher than the ID/IG value of the currently reported carbon materials,indicating that the new biomaterial EDMC prepared in this work contains more defect sites.In EDMC,the relative surface atomic percentages of C,0 and N elements are 80.69%,15.58%and 3.73%,respectively,which are rich in oxygen and nitrogen.2.The prepared EDMC was modified to the surface of glassy carbon electrode(GCE),and the glassy carbon electrode(EDMC/GCE)modified by EDMC was prepared for the construction of an electrochemical sensor based on the standard three-electrode system.Taking hydrogen peroxide(H202),ascorbic acid(AA)as the target,the electrochemical test methods such as cyclic voltammetry(CV),linear scanning voltammetry(LSV)and time-current Curve(I-t Curve)were used to study the electrochemical performance of the sensor.The experimental result shows that the construction of electrochemical sensors for hydrogen peroxide(H2O2)to detect the linear range of 15-300 μ M(R=0.998),with hydrogen peroxide(H2O2)to detect the minimum detection limit of 7.5 μ M,ascorbic acid(AA),uric acid(UA)and dopamine(DA),glucose and citric acid(CA),and other distractions is not affected after the reduction current,explain its quantitative detection of hydrogen peroxide(H202)selective.For ascorbic acid(AA)in the detection of linear range for 5-1525 microns,is divided into two sections,respectively,5-75 μM(R=0.998),and 75-1525 μ M(R=0.992),the detection limit for ascorbic acid(AA)is 3 μ M,adding several kinds of potential distractions such as anti-interference experiment uric acid(UA)and dopamine(DA),glucose and citric acid(CA),its oxidation current is not affected,means the sensor has the ability to ascorbic acid(AA)quantitative detection of selective.