Copper and Copper Oxides

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Copper, as a red-brown metal, is in high demand with a usage of more than 20 million tons per year. Copper and copper oxide(s) are both standard materials for the production of electrical cables and coins. They are also used as active ingredients in biocides (e.g. used in organic farming, in anti-fouling coating processes and for wood impregnation). In consumer products such as pillowcases and socks, copper oxide is used for its anti-microbial properties. Besides copper is also an essential trace element needed for the proper functioning of many enzymes in biological systems and the adult need is between 1 and 1.5 mg copper per day.

staple of copper pipes as application example for copper

Copper pipes © axe olga / fotolia.com

How can I come in contact with this material?

The risk of dermal uptake and skin sensitivity to copper (e.g. when handling of coins) is considered extremely low. However, copper oxide fumes can be breathed in and fume inhalation during the smelting of copper oxide powder can lead to metal fume fever, a disease with flu-like symptoms. Copper oxide can be found as a safe source of copper in over-the-counter vitamin supplements, but oral uptake of too high amounts of such supplements should be avoided.

Is there any risk from this material to humans and the environment?

Adverse effects in humans such as nausea and vomiting after the swallowing of copper oxide powder or lung damage after the breathing-in of copper oxide fumes have been reported. In most cases these effects are the result of exposure to very high doses of this metal and also to a higher bioavailability of copper with copper ions being released from copper oxide. However, copper is an essential trace element for the normal function of many tissues, including the nervous system, immune system, heart, skin as well as for the formation of capillaries. Copper is extremely well tolerated and processed by humans. This is not the case for all animals however and some wildlife species show greater sensitivity to copper toxicity.

Conclusion

Humans can have regular contact with copper and copper oxide through its many applications. It is important to keep in mind that copper oxide is a skin irritant and that its oral use (as an essential micro-element) should be limited. In addition, the handling of copper and copper oxide powder (also, as a nano-pesticide) should be done with great care.

Properties and Applications

electricity cable © mirkograul / Fotolia.com

Copper (chem. symbol Cu) is one of the world's most important industrial metals. More than 20 million tons of Copper are consumed annually. This high demand, which is driven in particular by the industrial growth in Asia (62% of world copper consumption is in Asia), results from its excellent features.

This versatile metal is mainly used as an excellent heat and electricity conductor. Although for example silver and gold conduct similar well, but are much more expensive. Aluminum conducts electricity better than copper does, however, it is problematic to handle and in contrast to copper is not so inert. This meant that copper is the undisputed standard material for electrical wires. It occurs in almost all power cables, transformers, switches, processors and similar products.

Also Renewables cannot perform without the excellent conductivity of copper. With increasing electrification of our transportation (car, train, plane) also applications for copper are increasing. Recent high-speed trains such as the German ICE 3, for example, require 2 to 4 tons of copper - more than twice the amount of a normal electric powered train.

In construction, copper is also a popular raw material: Almost 60 percent of all German homes have water pipes made of copper. In addition, it is used as roofing material and is popular due to its resistance to extreme weather conditions. Copper forms in the presence of air a green patina on the surface, each one of us knows those roofs in particular of older buildings.

Besides its application as copper coinage, the biocidal agent is currently most widely used. As such substance is used in antifouling paints for ships. This results in the prevention of the growth of micro-organisms (fungi, algae etc.), whereby ships can theoretically save up to 40 percent fuel. For the preventive wood preservatives, industry takes advantage of this biocidal effect as well.

At the same time, copper is also an essential trace element. Adult humans require daily about 1-1,5 milligrams of the material. We take it on by copper-containing foods, such as chocolate, liver, cereals, vegetables and nuts.

Nano Copper

Application of wood protection © Osterland / Fotolia.com

Application of wood protection © Osterland / Fotolia.com

Copper Nanoparticles are mainly used as a biocide and for electrical applications. In the information and communication technology small, precise switching and conducting paths are increasingly needed. This is supported, for example, by solutions or pastes made ​​of copper nanoparticles, which can be selectively applied through novel printing process.

Antifouling coatings for ship hulls are also considered as application for copper nanoparticles. But currently no product can be identified, which made the statement ​​to use such particles as a biocide.

Unlike in the field of biocides for wood preservation: The wood is significantly improved by the use of copper nanoparticles in biocides, prolongs the life of wooden structures and thus significantly reduces the cost for the consumer. Aqueous formulations of copper nano - and microparticles in the order of 1 nm to 25 microns have been used for several years in the commercial wood preservation. The consumption of copper nanoparticles for this industry experts estimate that several thousand tons per year. Therby such wood preservatives have the potential to be one of the largest nano applications in Europe for hard woods such as Norway spruce (Picea abies) and silver fir (Abies alba).

Metallic nanocopper is self-igniting. The mixture of nanocopper with air (dust) is also ignitable without the influence of an ignition source. In contrast, nanoscale powder of copper oxide is not self- inflammable. Copper oxide dust just as little, so there is no possibility of a dust explosion in copper oxide ..

Occurrence and Production

In 2011, more than 16 million tons of copper from ore mines are mined. Already 5.3 million tons in Chile, currently the largest copper producer in the world. Copper is also good to recycle, so that even a large part of the global demand will be covered by so-called secondary copper.

Copper nanoparticles can be prepared by wet chemical methods or by flame synthesis. In the wet chemical variant copper salts, e.g. copper sulfate are reduced in the presence of a stabilizer (polymers, amine compounds, etc.) to nanoparticles. This one contains colloidal solutions of nanoparticles that can be processed directly. In flame synthesis under strongly reduced conditions cupreous compounds are burned, and so copper nanoparticles are obtained. There is the possibility of burning different metal-containing compounds, whereby hybrid metal particles (alloys) can be obtained.

 

Further information

Production

Der Bingham-Kupfer-Tagebau in Luftaufnahme. Bildquelle: Allen-stock.adobe.com

Bingham open pit copper mine in aerial view @ Allen-stock.adobe.com

Copper is mainly mined in open pits, with smaller shares being extracted underground. The main producing countries are Chile, Peru and China. The copper content in the mined ores is generally very low, so the effort required for enrichment is high and resource-intensive.

As copper is used both in electrical cables and as a cathode material in batteries (e.g. vehicle batteries), demand is expected to rise steadily due to the expansion of renewable energies (e.g. off-shore wind farms) and electromobility.

Resource consumption during reprocessing

Since the ores only have a very low copper content of between 0.6 - 0.7%, the resource consumption until copper is available in pure form is enormous. Since the majority of copper ores are mined in open pits, land consumption is high. In addition, a lot of overburden is produced, which is also stored in stockpiles and consumes land. To extract the copper from the ore, a lot of water is needed, which is also mixed with chemicals. Some of the water can be recovered and reused; the remaining water is stored in settling ponds. Smelting the copper ores at high temperatures also consumes high amount of energy.

Safety

Copper is an essential element for some living organisms. Nevertheless, too high concentrations can have a harmful effect. For example, inhalation of dust containing copper can cause lung irritation in humans. As with other dusts, the small, respirable particles are particularly critical here. This is particularly relevant for open-pit mining, which often takes place in very dry areas, favoring high dust levels. In addition to copper, the dusts often contain other heavy metals that are toxic to humans and the environment. Copper is very toxic to aquatic organisms from both short-term and long-term exposure.

Wastewater from copper mining also usually contains other toxic heavy metals (e.g., lead) and semimetals (e.g., arsenic) that pollute the environment.

Emissions

High amounts of CO2 are released during the mining and further processing of copper. The CO2 emissions occur during mining (fuel for machinery), during further processing of the ore and smelting, and for transport. Smelting also produces sulfur dioxide, the emissions of which are largely captured by filters and processed into sulfuric acid.

Mining produces overburden, which is mostly deposited in tailings piles in the vicinity of the extraction sites. It is estimated that approximately 570 t of various residues are produced per ton of copper. Washing the ore also produces water contaminated with process chemicals and heavy metals. In some mining regions, the water is discharged into rivers and causes fish kills.

Social Aspects

Copper mining often offers good income opportunities even in remote areas, and leads to the creation of further jobs in other industries. Conflicts occur mainly in countries with weak governance and concern fair pay, working conditions, and occupational health and safety. In some regions, conflicts arise with the local population regarding land and water use or even resettlement.

Entrepreneurial concentration in copper mining is considered to be low. This is advantageous because it means that not only a few companies profit. The value added in mining and processing the ore is good, so that the respective countries benefit, even if no further processing of the copper takes place in the country.

The weighted country risk (reference in German) for the mining countries, into which the indicators of the World Bank are incorporated (Worldwide Governance Indicators), shows a medium risk. This means that there is room for improvement in some producing countries in areas such as political stability, voice and anti-corruption.

For responsible metal production, due diligence in supply chains is becoming increasingly important in the EU. The law requires the documentation or certification of social standards and occupational health and safety, but initially only for companies with more than 3,000 employees. There are numerous initiatives (e.g. for certifications) to improve social and environmental conditions and thus sustainability in copper mining.

Disposal and recycling

Copper can be recycled almost infinitely without any loss of quality. A distinction is made between unmixed scrap, which can simply be melted down and reprocessed, and old scrap, which also contains other materials and from which copper has to be extracted again in complex processes. The share of secondary copper from recycling processes is about 17% worldwide and 41% in Germany. In general, however, it is estimated that 30-80% less energy is required for recycled copper than for virgin copper, depending on the type of processing.
For batteries, there are legal requirements for recycling rates. The European Battery Regulation specifies a recycling rate of 90% for copper in 2027.

How to make the material more sustainable?

In the main applications (e.g. power cables, printed circuit boards) substitution is difficult; in some cases copper can be replaced by aluminum in electrical applications. The recycling rate or recycling processes can be improved, especially for old scrap. However, copper is readily available and many new mining sites can still be developed, which reduces the motivation for recycling.

Further information:

 

 

Studies on copper and copper oxide particles show a toxic reaction due to the release of copper ions. High doses can cause various disorders in liver, kidney or neuronal functions due to the released copper ions.

Studies on Living Organisms – in vivo

Acute oral toxicity of copper particles has shown a significant correlation with its size distribution where micro-sized copper particles were classified as non-toxic (LD50 < 5000mg/kg). On the contrary, nano-sized copper particles had a LD50 of about 400mg/kg in mice and were classified as moderately toxic based on the Hodge and Sterner scale. After oral gavage of nano- and micro-particles with a concentration of 70mg/kg body weight in mice and an equivalent of soluble CuCl2 (147,6mg/kg) only the nano-copper generated an accumulation of excessive alkalescent substance and copper ions that even culminated in a metabolic alkalosis and overload of copper ions similarly to the results obtained with copper chloride ..

Another in vivo study conducted with rats analysing urine, serum, and extracts from liver and kidney tissues by metabolomic approach after up to 200mg Cu NP/kg body weight treatment for 5 days showed the induction of severe hepatotoxicity (toxin-induced liver disease) and nephrotoxicity (poisonous effect on the kidneys) similar to copper overload . The nephrotoxicity was mainly caused by an oxidative stress and at high doses (up to 600mg/kg body weight) cell death (apoptosis) via both extrinsic and intrinsic pathway was observed .

Treatment of mice via inhalation (4 hr/day 5d/week for 2 weeks with 3,5mg/m3) or instillation (24 hr post-exposure 3, 35, and 100µg/mouse) resulted in both cases in an induction of inflammatory responses and the recruitment of neutrophils into the lung. The simultaneous administration of Cu NP and bacteria impaired the pulmonary clearance against Klebsiella pneumonia .

After intranasal instillation of Cu-NP in mice not only the tissue and cells in direct contact are affected but also systemic effects have been observed. After middle dose of 40mg/kg body weight treatment significant changes in various neurotransmitter levels were measured in different brain regions, indicating a systemic effect in tissues were no particle or ion accumulation could be observed .

In general the described effects may be summarised in the following way: The particles determine the biodistribution and the release of copper ions, whereas the toxicity is comparable to cupper ions or other soluble nanomaterials.

 

Studies Outside of Organisms - in vitro

Studies of Cu and CuO particles have shown that these particles as others too tend to agglomerate quickly in cell culture medium. These agglomerates were taken up by different cell types in vesicular structures mostly and were not described to be free in the intracellular fluid (cytosol).

Cu and CuO nanoparticles as long as they are not coated are soluble in aqueous suspensions and release copper ions. Among the dose dependent cytotoxic effects, observed between 1-80µg/ml a gene expression study could demonstrate after treatment of A549 human lung carcinoma cells with 25µg/ml CuO nanoparticles (300nm agglomerates of 50 nm primary particle size) an up-regulation of metabolic processes and stress response genes as well as the down regulation of specific cellular processes and cell cycle regulating genes. In parallel the supernatant of CuO nanoparticles incubated cell culture medium was used for treatment experiments too and most of the effects observed with CuO nanoparticles could be seen as well, indicating that the CuO-NP toxicity is mainly due to the Cu ion release  .

In comparison with other nano-sized metal oxides such as TiO2, ZnO, Fe3O4, Fe2O3 or carbon-based materials e.g. carbon nanotubes, the non-coated nano-sized copper or copper oxide particles induced always the most severe cytotoxic effects at similar concentrations [3,4].

Several studies compared micro-sized with nano-sized CuO and showed independent of the cellular systems used e.g. A549, Hela or Chinese hamster oocytes, or CaCo-2 cells that the nano-sized material induces more severe effects in these cells due to their higher release of Cu ions.

Currently, there are no data regarding the environmental exposure to copper and copper oxide nanoparticles. In general, copper and copper compounds are naturally present in soils and waters.

Using computer models, a study has calculated that environmental concentrations of 0,06mg/l of copper nanoparticles could occur in Taiwanese rivers .

After inhalation or instillation of non-coated copper and copper oxide nanoparticles, no transfer into the bloodstream has been described to date. After oral administration, an increased level of copper ions was detected in the liver and kidney.

Uptake via the Lung – Inhalation

The determination of translocation across the air blood barrier is difficult for soluble particles since the dissolution of the particles may occur faster than the time point of analysis. However, as shown in the study of Zhang and coworkers, an increased level of copper ions was measured in liver, lung and olfactory bulb after inhalation of 40 mg/kg mice indicating that at least the released copper ions were able to cross biological barriers .

 

Uptake via the Gastro-Intestinal Tract

However, a confirmation of the presence of nanoparticles (NP) in the tissue is missing due to the solubility of copper (oxide) NPs. Copper (Cu) and copper oxide (CuO) particles induced hepatotoxic and nephrotoxic effects after application of high doses but the biological responses may be due to their Cu ion release .

There are numerous studies on the effect of copper (Cu) and copper oxide (CuO) nanoparticles on environmental organisms. Most take into account the effect of soluble copper ions and/or compare the effects of nanoscale Cu and CuOs with effects of coarser Cu and CuO particles. Some studies report a higher toxicity of nanoparticles compared to dissolved ionic copper but in many studies no differences in the effects could be found. Copper is one of the substances known to be ecotoxic, and copper compounds have been used for decades in paints for ship hulls to prevent the growth of algae, mussels and snails.

Copper and copper oxide nanoparticles were tested for their effects on different organisms living in different habitats. CuO nanoparticles are toxic to bacteria . However, copper ions dissolving from the particles are responsible for the effects; they interact with the "protective cover" of the bacteria and induce oxidative stress. In the presence of substances "scavenging" copper ions (chelators), no toxic effects were observed. Surprisingly, however, the toxic effects differed depending on the origin of ion: ions originating from particles act differently than ions from copper salts. Coarser particles released only very few ions and were not toxic.

The protozoan Tetrahymena responded to various copper compounds with a change in the composition of its fat components . At comparable toxicity nano-CuO released less ions compared to copper salts or coarse copper particles, hence an additional effect by the nano-form is assumed.

 

The effect of Cu nanoparticles on soil-dwelling worms was tested by mixing the particles into the soil. Depending on the worm species, contradictory results have been achieved. Cu nanoparticles had an inhibitory effect on the propagation of worms but administered in the same amounts as copper salt it was more toxic than the particles in one study and less toxic or of equal toxicity in another study. The effect of Cu nanoparticles and copper salts led to very different gene activation response patterns, leading to the assumption that the copper nanoparticles cause a specific effect, which is not comparable to copper ions .

 

Studies on zebrafish draw the same conclusion additionally showing a damage to the gills. Cu2O nanoparticles were less toxic for zebrafish than copper salts. Carp showed a growth delay after exposure to nano-CuO, a particle uptake into various organs was also detected .

 

CuO nanoparticles disrupt the development of Xenopus embryos. The main intake route was the ingestion of particles. Consequently, damage to the gastrointestinal tract was observed, which was due to both the particulate form and the ions. An electron microscopic study showed an uptake of CuO particles (nano and micro) in the intestines of water fleas but for both particle types no uptake from the gut into the body was observed. Water fleas showed a higher sensitivity to nanoparticles compared with coarser particles or salts .

 

A soil-dwelling water snail ingested more copper from nano copper oxide compared to coarser copper oxide and copper salts. Accordingly nano copper oxide had the greatest effects on growth, feed intake and reproduction of animals ..

 

Copper oxide particles had a toxic effect on green algae. In order to prevent the leaching of copper ions, CuO particles were coated with a polymer. These particles, however, showed a higher toxicity. The coating probably increases the particle uptake into the cells. Similar results were obtained on blue-green algae that took up more particles in the presence of organic materials. For various aquatic organisms (algae, crustaceans, rotifers) CuO particles were less toxic than copper salts, from the particles used in this study no leaching of ions was observed .

 

Different plant species (radish, ryegrass and duckweed) were inhibited in their growth in a consistent manner. In addition, DNA damage was observed in radish and ryegrasses. Although the absorption of copper in plants was higher when copper was present than ions, more damage in the genome occurred after exposure to nanoparticles. The duckweed took up more copper when it was present in particulate form. Corn plants showed nanoCuO induced growth retardation but not with Cu particles or coarse salt. A particle uptake by the roots and the distribution in the plant has been demonstrated [15]. Significant differences in the sensitivity of individual plant species were observed .

 

In summary, it can be stated that the known toxic effects of certain doses of copper occur likewise for the nano-form of copper. From the available studies no general statement can be made as to whether the effect is due solely to the ions or particulate form. The observed effects are due in part to the effect of the dissolving copper ions, and copper may be internalised in principle by many organisms. Between the two types of nanoparticles of CuO and Cu, there are no striking differences in the effects on organisms and there is no difference in the solubility.

Currently, there is no clear evidence that copper or copper oxide particles can pass biological barriers. They can be taken up by different cell types.

Behaviour at Tissue Barriers

Several ingestional or inhalation studies measured increased level of copper in different organs beyond the barrier tissue. However the analytical method applied is not always able to discriminate between nanoparticulate and ionic form. This is a general problem for (readily) soluble nanoparticles .

 

Behaviour of Uptake in somatic cells

Inside a cell the nanoparticles were accumulated in vesicular- or lysosomal-like structures.Uncoated particles will dissolve over the time in these organelles and induce either hot spots of high concentrations of Cu ions or may create hot spots of reactive oxygen species (ROS) formation .

Overall, there are very little data on the environmental behaviour. In a comparative study of several nanomaterials, nanoscale copper showed a relatively good mobility in artificial soil.

High salt concentrations resulted in a reduction of the mobility, whereas in the presence of humic acids, a slight increase was observed. Only few ions dissolute from the copper oxide nanoparticles used .

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Further Materials


Gold
Zirconium Dioxide
Graphene
Quantum Dots
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