The Fabrication Of Nanoporous Copper And Alloy And The Research Of Catalytic Application

Nanoporous metals have double attribute of structural and functional materials, and theynot only have nanoscale pores and high specific surface area, but also have some specialphysical, chemical and mechanical characteristics, such as good electromagnetic properties,high chemical stability and yield strength. With the deepening of the research of preparation ofnanoporous metals thorough dealloying, many novel phenomenons and characteristics werefound step by step, which caused attentions of academia and business community. At thepresent stage, wide industrial applications of nanoporous noble metals are strictly limited bytheir high cost. In comparison with the noble materials, nanoporous copper (NPC) is one of theattractive inexpensive nanoporous materials with rosy prospects for wide application. So far,material systems were used to prepare nanoporous copper have been involved in binary andternary single-phase solid solution, multiphase alloy and amorphous alloy, however, theregulation of pore structure, looking for new material systems and the actual applications arestill hotspots on this subject. So according to the above three aspects, this paper carried out thefollowing research work:(1) Research for the regulation technique of the microstructure of nanoporous copperBy controlling different cooling speeds which were obtained by different roller speed (500,1000,1500,2000r/min), nanoporous copper were successfully synthesized by dealloying ofCu15Al85alloy in5wt.%HCl corrosion. Combining characterization results, it is concluded thatwith the increase of cooling rate, the specific surface area of nanoporous copper increasesgradually and the size of pores decreases gradually。Add89Al-3La-8Ce master alloy into Cu15Al85alloy, study the change of microstructureand explain the causes of change reasonably.(2) Ternary new material systems for preparation of nanoporous copper and alloyNanoporous copper was prepared by Al-Cu-Mn ternary alloy, and the influence of alloycomposition and corrosion time on the corrosion process and porous structure was studied. Thecorrosion of Cu30Al25Mn45alloy is more severe than Cu30Al35Mn35and Cu30Al30Mn40alloy, andNPC obtained by Cu30Al25Mn45alloy is prone to reunite phenomenon finally. WhileCu30Al40Mn30alloy needs longer corrosion time and higher corrosion temperature to form nanoporous copper. In addition, by studying the microstructure of different corrosion time forCu30Al30Mn40, the evolution of pores and ligaments in the early stage and coarsening in the latercan be obtained。Nanoporous copper alloy was prepared by Al-Cu-Ni ternary alloy, and differences incomposition have a great influence on its microstructure after corrosion. With the increase ofnickel content, small holes reduce and chip areas without corrosion increase gradually in theporous structure for Al75Cu23Ni2, Al75Cu19Ni6and Al75Cu15Ni10alloy.(3) Application of nanoporous copper obtained by dealloyingCu/Cu2O nanoporous composite was synthesized via the combination of dealloying ofmelt-spun Al-Cu precursor alloy in acid solution with subsequent surface oxidation in air. Itwas used as catalyst for ultrasonic degradation of methyl orange. And the effect of pH value ofmethyl orange solution, additive amounts of catalyst, initial concentrations of methyl orangeand inorganic ions on the degradation process has been investigated. The degradationmechanism of the as-prepared catalyst has also been discussed.