copper

The physical and mechanical properties of epoxy composites filled with copper-plated polyamide granules were investigated. Physico-mechanical properties were evaluated based on the results of tensile and impact toughness studies. It is shown that the obtained composites have high strength properties, which are preserved at the level of the unfilled matrix. It was established that the presence of polyamide granules of a copper shell on the surface has little effect on the change in the physical and mechanical properties of epoxy composites.

Bioelectrochemical systems provide a promising tool for the copper recovery from the heap leaching solutions which usually contain low copper and high iron concentrations. In this study, the role of copper and ferrous ion concentrations, and external resistance in the removal of synthetic sulfuric acid solutions by a lab-scale Microbial Fuel Cell (MFC) was investigated and good results were obtained in the removal of copper.

The possibility of obtaining metallized granules of high-tonnage polymers using classical metallization technology was studied. It is shown that this technology is not effective during the metallization of polyethylene and polypropylene. Certain positive points during metallization were achieved only in the case of polyvinyl chloride granules.

The geometric dimensions of the copper shell formed by chemical deposition on a spherical polyethylene granule were calculated. It is shown that the main factor determining the thickness of the formed copper layer is the initial size of the polyethylene granule. The processes of destruction of the copper shell formed on the polyethylene granule during thermal expansion of the polymer are considered. The values of the limit temperatures in which the copper shell still retains its integrity depending on its thickness are calculated.

The results of experimental studies of copper plating of polyvinyl chloride granules in a chemical precipitation solution are presented. The influence of the surface area of polyvinyl chloride granules on the kinetic regularities of copper reduction and the copper content on metallized granules has been studied. It is established that the surface area of polyvinyl chloride granules has a significant effect on the rate of reduction of copper ions and does not affect the amount of reduced copper.

In the present study, the interactive effects of the process variables containing copper concentration, temperature, and time on the efficiency of copper cementation by metallic aluminum particles were examined by using response surface methodology (RSM). It was observed that the efficiency of cementation increased with an increase in the initial concentration of copper, temperature and time. The multiple regression analysis to the experimental data was applied to see the interactive effects of process variables. The second-order polynomial equation was obtained.

CuMnx/activated carbon (AC, x = 0.1, 0.2, 0.5 and 1) nanoparticles were prepared by deposition-precipitation method. The catalytic performance of CuMnx/AC catalysts were studied for the oxidation of benzyl alcohol to benzaldehyde. The molar ratio of Mn plays an important role in the catalytic performances. The optimum amount of Mn is 0.1 with the highest benzyl alcohol conversion of 63 %.

This study focuses on identifying some of the heavy and toxic elements concentration in several sources of water in Diyala Governorate in Iraq, such as the Diyala River and the Khіrisan River. The samples of tap water and bottled drinking water were taken three water wells from and two companies. The elements under study were: lead, cadmium, copper and chromium. Flame atomic absorption spectroscopy has been used to determine the concentrations.

The results of experimental studies of the peculiarities of metallization of granular polyethylene are presented. The influence of concentration factors on the metallization process of zinc-activated polyethylene granules of brand Liten PL-10 was investigated. It is established that by changing the concentration of copper sulfate and sodium hydroxide, as well as the degree of loading of polymeric raw materials, it is possible to effectively regulate the amount of recovered copper on granules of polyethylene, and therefore the thickness of the metal layer formed on them.