New Method Reparation Of Copper Based Carbon Nanomaterials And Their Catalytic Performance Study

With the rapid development of human society and economy,the fossil energy with limited reserves on the earth has been overexploited and used since entering the new century.Because of huge consume of catalysts in industrial production.The development and utilization of new catalysts can alleviate the energy crisis to a certain extent.Copper-based nanomaterial,as the most abundant,green and environmentally friendly metal on the planet,due to its unique properties,has been used in many energy fields,such as organic reaction catalysts,electrocatalysts,and photocatalysts.Therefore,the design and development of copper-based nanocatalysts have great significance.In this paper,a series of copper-based nanocomposites were successfully prepared by combining copper-based nanomaterials with two kinds of new carbon material through different preparation methods,and their morphology and structure were analyzed by various characterization methods.Finally,the performance of copper-based composite nanomaterials in the catalytic degradation of nitrophenol and glucose was investigated.The main contents are as follows:1.Copper nitrate and copper acetate were selected as different copper sources,and graphene oxide?GO?was used as the supporting material.Cu@GO and Cu@GO*were prepared by sintering in the tube furnace.According to the galvanic replacement reaction equation,a series of copper-based nanocomposites Cu-Au@GO,Cu-Au@GO*with different copper-gold molar ratios were successfully prepared by adjusting the amount of chloroauric acid used.In the model experiment of nitrophenol degradation,Cu-Au@GO?2:1?prepared with copper nitrate as the copper precursor has the best catalytic activity(k_nor=108.69 s^-1mg^-1),which performance is about22.84 times than Cu@GO(k_nor=4.69 s^-1mg^-1).The copper-based nanocatalyst can also accomplish rapid degradation of MO,MB and CR with less amount of use.2.The copper-based nanocomposites Cu/GO and Cu-Au/GO were successfully prepared in a polyol solvent system by microwave-assisted heating,the synthesis steps were optimized by XRD,SEM and other characterization methods.In 1M NaOH electrolyte,the prepared copper-based nanocomposite-modified electrode was used for enzyme-free glucose detection.To find the most proportion of Cu and Au in the material.Cyclic voltammetry results show that Cu₂-Au₁/GO has the best electrocatalytic activity under the same experimental conditions.The optimal working potential of this sensor was determined by timing current ampere method.Under the optimized experimental conditions,the Cu₂-Au₁/GO modified electrode has a linear detection range for glucose from 2.50?M to 3.39 mM.According to the fitted curve,the sensitivity value of the sensor was calculated to be 1648?A cm^-2mM^-1 and the estimated LOD of the sensor was 0.85?M.Finally,the copper-based nanocomposite Cu₂-Au₁/GO-modified electrode is used as an enzyme-free glucose sensor.The sensor can still maintain the ability with the presence of common interference substances UA,DA,AA and metal ions K⁺,Ca²⁺,which may poison the nanometal.This kind of glucose detection sensor can maintain good electrocatalytic activity in a short time?6 consecutive tests?and a longer time?30-day interval test?.3.Carbon nanotubes?CNTs?were selected as supporting materials,and a series of copper-based nanocomposites Cu/MWCNTs,Cu-Au/MWCNTs were successfully prepared on the basis of microwave method research.According to XRD,SEM and other characterization results,it was found that adding a certain amount of ascorbic acid to the ethylene glycol synthesis system was the key to achieve the preparation of copper-based nanocomposites without oxides.The cyclic voltammetry test results show that different types of carbon nanotubes?SWCNTs,MWCNTs?and the amount of carbon nanotubes will affect the electrocatalytic activity.According to the results of CV tests,the activity of copper-baesd nanocomposites when MWCNTs as the support material are better than SWCNTs.It should be know that the electrocatalytic activity decreased when use excessive amout of MWCNTs.The electrocatalytic activity of glucose oxidation of prepared Cu based nanomaterials are as follows:Cu-Au/MWCNTs>Au/MWCNTs>Cu-CTAB/MWCNTs>Cu/MWCNTs>Cu/MWCNTs_150mg.The chronoamperometry test shows that Cu-Au/MWCNTs nanocomposite have the best catalytic performance of the sensor at+0.35V.The linear detection and fitting results revealed that the glucose detection range of the Cu-Au/MWCNTs modified electrode is 5?M to 2.325 Mm under the optimized experimental conditions.The calculated sensitivity value of the sensor is 1185?A cm^-2 mM^-11 and the current response time for glucose detection is about 2s.We also investigated the selectivity and stability of the enzyme-free glucose sensor,the results show that the Cu-Au/MWCNTs-modified electrode can maintain a high sensitivity response of glucose even in the presence of common interfering substances UA,DA,AA and metal ions K⁺,Ca²⁺.Cu-Au/MWCNTs modified electrode has less loss of electrocatalytic activity after 10 consecutive CV tests and 1800s continuous work.