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Corrosion02:49

Corrosion

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The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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Microbial Leaching

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Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...
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Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
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Copper-hydroxyl interactions drive water-promoted copper surface oxidation and mobility.

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Water (H2O) accelerates copper oxidation by creating a disordered interface that facilitates oxygen incorporation. Pure oxygen (O2) oxidation results in a more ordered interface, hindering further oxidation.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Catalysis

Background:

  • Metal oxidation by oxygen (O2) and water (H2O) is crucial for catalysis and corrosion.
  • Differentiating O2 and H2O roles is difficult due to shared intermediates like hydroxyl (OH).

Purpose of the Study:

  • To investigate the promotional role of H2O in copper (Cu) surface oxidation.
  • To elucidate the mechanisms behind water-assisted metal oxidation.

Main Methods:

  • In-situ transmission electron microscopy (TEM).
  • ReaxFF reactive force field molecular dynamics (MD) simulations.

Main Results:

  • Water dissociation yields hydroxyl (OH) that adsorbs preferentially at disordered Cu/CuOx interfaces.
  • Strong Cu-OH interactions induce dynamic disorder and electronic changes, promoting oxygen incorporation and Cu mobility.
  • Pure O2 oxidation leads to ordered interfaces, suppressing further oxidation.

Conclusions:

  • Hydroxyl-mediated interfacial dynamics are key drivers of water-assisted metal oxidation.
  • Findings offer guidance for controlling oxidation in materials for catalysis and corrosion resistance.