| In this thesis,the use of functional nanomaterials modified carbon electrode to functionalize the electrodes with electrochemical catalysis and solid-phase microextraction,and used to the electrochemical catalytic conversion of carbon dioxide,adsorption and extraction for electrochemical detection of environmental pollutants.The prepared multi-walled carbon nanotubes/ferric hydroxide nanoparticles as the main modified materials doping with lanthanum modified the carbon fibre composed electrodefor photo-electrocatalysis of greenhouse gases CO2.The multi-walled carbon nanotubes/ferric hydroxide nanoparticles modified glassy carbon electrodes for electroanalytical determination of phenolic pollutants triclosan and bisphenol.At the same time,the PM7 semi-empirical molecular orbital method in MOPAC2012 quantum chemical calculation software is used to further verify the experimental results,and good results are obtained.1.Cyclic voltammetry to investigate the photoelectrocatalytic process of CO2conversion on the ferric hydroxide nanocatalyst modified carbon fiber cluster electrode.The results show that the reduction current increasessignificantly after carbon fiber cluster electrode modified by multi-walled carbon nanotubes.the electrocatalytic activity is furtherenhanced with the modification of the ferric hydroxide nanoparticles,and the lanthanum doping has a better effect on the photocatalytic reduction of CO2.Theoretical calculation results show thatthe designed Fe-O-Cl clusters instead of ferric hydroxide nanoparticles is stable,and the stability after doping lanthanum is stronger.Ferric hydroxide nanoparticles have electron transfer properties for CO2,the lanthanumdopingdecreases the band width of the system,and benefits for the photocatalytic conversion reaction of carbon dioxide.the theoretical and experimental results are consistent.In addition,large changes in the bond length of carbon-oxygen,molecular structure and infrared spectrum of the CO2,the precursor structure of carbonic acid was found,which realizes the initial activation of CO2.2.Themulti-walled carbon nanotubes supported ferric hydroxide nanoparticles modified glassy carbon electrode was prepared and characterized by particle size,infrared spectrum and XRD.The modified electrode was used to study the electrochemical behavior of triclosan by cyclic voltammetry,and shows a solid-phase microextraction behavior.The linear relationship between the oxidation peak current and the logarithm of triclosan concentration in the concentration range of3.333×10-43.333×10-66 mol/L and the detection limit is 3.333×10-66 mol/L,this method has been applied to the detection of triclosan in hand sanitizer.Theoretical calculation results show that the models of triclosan and the composite catalysts are stable with the?G<0,it is proved that the reaction is feasible and the number of translatable electrons is consistent with the results of cyclic voltammetry.3.The modified electrode was further used in the study of electrochemical behavior of phenolic pollutant BPA.on multi-walled carbon nanotubes supported ferric hydroxide nanoparticles modified glassy carbon electrode,BPA shows a solid-phase microextraction behavior,too.Cyclic voltammetry results show that the linear relationship between the oxidation peak current and the logarithm of BPA concentration in the range of 1.667×10-43.333×10-66 mol/Land the detection limit is1.167×10-6mol/L.Theoretical calculation results show thatthe models of BPA and the composite catalyst are stable,the number of translatable electrons are consistent with the experimental results. |
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