Preparation Of Nanosized Metallic Copper And Cuprous Oxide As Well As Their Performances Of Electrical Conduction And Photocatalysis

In this article,the preparation and application of different copper based nano materials were studied.(1)Copper nanowires with different sizes were prepared by wet chemical reduction method,and the conductivity of copper nanowires was studied;(2)Attapulgite@copper(ATP@Cu)nanocomposites material was prepared by dipping and redox method,and the electrical conductivity of the composites was studied;(3)Cu₂O octahedral nanoparticles,Cu₂O@Cu nanocomposites,metal Cu nanoparticles of different sizes were prepared by wet chemical reduction method.The photocatalytic performance of Cu₂O octahedral nanoparticles and Cu₂O@Cu nanocomposites and the electrical conductivity of metallic Cu nanoparticles were studied.The experiments carried out in this article are specifically introduced as follows:Using copper sulfate pentahydrate as the copper source,aliphatic amines(methylamine,ethylenediamine,1,2-propanediamine)as the inducer,and hydrazine hydrate as the reducing agent,copper nanowires with different particle sizes were prepared by the wet chemical reduction method under different reaction time conditions,and the electrical conductivity of copper nanowires with different particle sizes was studied.Through high-resolution transmission electron microscopy(HRTEM),it is found that copper nanowires are synthesized by coalescing copper nanoparticles with a particle size of 1-6 nm.The longer the reaction time is,the better it is to coalesce copper nanoparticles to form copper nanowires during the reduction process.The experimental results show that the use of diamine is more conducive to promoting the formation of copper nanowires,and the activity of aliphatic amines to coalesce copper nanoparticles in copper nanowires is:ethylenediamine>1,2-propanediamine>methylamine.Compared with methylamine,when used ethylenediamine and 1,2-propanediamine as inducers,greatly increase the degree of coalescence of copper nanoparticles in copper nanowires.When copper nanowires are used as an additive for water-based mixed paint,the conductivity is higher than when copper nanoparticles is used as an additive for water-based mixed paint.One-dimensional copper nanowires significantly improve the electrical conductivity of the water-based alkyd paint film.Using copper nitrate trihydrate as the copper source,ATP@Cu nanocomposites were prepared by impregnation and redox methods,and the electrical conductivity of ATP@Cu nanocomposites prepared with different copper contents was studied.XRD showed that with the increase of copper content,the crystallite size of Cu nanoparticles gradually increased,and its crystallinity was improved.High-resolution transmission electron microscopy(HRTEM)analysis shows that Cu nanoparticles coated on the surface of ATP grow along the(111)crystal plane.X-ray energy spectrum analysis(EDS)showed that the Cu nanoparticles are uniform Ly distributed on the surface of ATP.The prepared ATP@Cu nanocomposite is used as the additive of the water-based alkyd blend paint.Experiments show that as the content of ATP@Cu nanocomposite increases,the square resistance of the water-based blend paint decreases;As the Cu content increases,the square resistance of the water-based blended paint decreases.Using copper sulfate pentahydrate as the copper source,polyvinylpyrrolidone(PVP)as the modifier,and hydrazine hydrate as the reducing agent,Cu₂O octahedral nanoparticles,Cu₂O@Cu nanocomposites,Cu₂O@Cu nanocomposites and metal copper nanoparticles were prepared by a wet chemical reduction method at different reaction temperatures.At the same time,the photocatalytic activity of Cu₂O octahedral nanoparticles and Cu₂O@Cu nanocomposites and the electrical conductivity of the metal copper nanoparticles were studied.Compared with Cu₂O octahedral nanoparticles synthesized at 25°C and Cu₂O@Cu nanocomposites synthesized at 30°C,Cu₂O octahedral nanoparticles synthesized at 30?showed higher photocatalytic activity in the degradation of green algae.When 2 mg of Cu₂O octahedral nanoparticles synthesized at 30?were added to 250 m L of green algae(2mg·L^-1)aqueous solution with p H=6,exposed to visible light for 3 h,the conversion rate of green algae reached 87%.During the research process,it was found that when the metal copper nanoparticles prepared at 40?were used as the surface coating of the fluorocarbon metal paint film,the square resistance of the fluorocarbon metal paint film decreased significantly as the content of the nanometallic copper increased.