Preparation And Catalytic Performance Of Copper-based Nano Core-shell Particles/modified Graphene Composite

With the development of the times,people are paying more and more attention to health issues.As a disease that is extremely harmful to human health,diabetes is a disease that is extremely harmful to human health.The monitoring of blood sugar during the treatment process is very important.Therefore,the development of high sensitivity and specific blood sugar sensors are of great significance;As water is the most important non-renewable resource on the earth,it is necessary to protect water resources.In the process of purifying polluted water resources,the removal of nitrogen-containing organic matter is a difficult problem facing people;Copper is a kind of transition metal with high content on the earth.Its simple substance has good properties and is easy to be oxidized;Graphene has attracted wide attention due to its excellent properties.Modifying it can further improve its performance.This thesis is based on copper-based precious metal composite materials,combined with a series of characteristics of modified graphene,such as high specific surface area and high conductivity,designed a series of modified graphene-supported nano-metal alloy composite materials,with various characterizations the method is used to analyze the composition of the composite material and perform performance tests in the aspects of glucose sensing and catalytic degradation of p-nitrophenol.The main work is as follows:1.Using ethylenediamine as nitrogen source to synthesize nitrogen-doped modified graphene by hydrothermal method,on the modified graphene with copper nitrate as precursor,synthesize Cu/N-GO material and copper nanoparticles by microwave method.The diameter is about 50 nm and the load is uniform on the N-GO.The amount of chloroauric acid used is calculated according to the composite materials with different copper-gold ratios to be prepared,and the substitution reaction is carried out in a nitrogen atmosphere to obtain the Cu@Au/N-GO.The composite material has passed the cyclic voltammetry test.When the ratio of copper to gold is 2:1,the performance reaches the best.The electrochemical glucose sensing performance test is performed on it.Under the best working voltage of 0.45 V,the sensitivity reaches 1386.4 u A·m M^-1·cm^-2,the detection limit(S/N=3)is 4.52×10^-7mol/L,and it has good anti-interference and stability.2.Dope polyvinylaniline(PEI)with graphene.The long-chain structure of polyvinylaniline can be used as the loading site of metal nanoparticles.With copper nitrate as the precursor,it is operated by hydrothermal and microwave methods.The Cu/PEI-GO material with uniform particle size is synthesized on the surface of PEI-GO.And then the amount of potassium chloropalladite used is calculated according to the composite material with different copper and palladium ratios to be prepared,and the replacement reaction is carried out in a nitrogen atmosphere to obtain the prepared Cu@Pd/PEI-GO composite material.The composite material is subjected to the experiment of catalyzing p-nitrophenol.When the ratio of copper and palladium is 2:1,the catalytic efficiency is the highest,and its k_app=3.213×10^-3,and it has a very good performance in cyclicality.Not only that,the composite material prepared in this experiment also has a certain degradation catalysis for other nitrogen-containing organics.3.Using ethylenediamine as nitrogen source to synthesize nitrogen-doped modified graphene by hydrothermal method,mixing carbon nanotubes and N-GO together,using copper nitrate as precursor,and preparing Cu/N-GO-MWCNT under microwave conditions,the copper nanoparticles have a particle size of about 50 nm and the load is uniform.Then,calculate the amount of potassium chloropalladite to be prepared according to the composite materials with different ratios of copper to palladium,and prepare Cu@Pd/N-GO-MWCNT under a nitrogen atmosphere.And the composite material is subjected to the experiment of catalyzing p-nitrophenol.The results show that when the ratio of Cu and Pd is 2:1,the performance is the best:k_app=5.50×10^-3,and it has very good performance in recycling,it also shows excellent performance in degrading other nitrogen-containing organics.