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Selective Recovery of Pure Copper Nanopowder From Indium-Tin-Oxide Etching Wastewater by Various Wet Chemical Reduction Process: Understanding Their Chemistry and Comparisons of Sustainable Valorization Processes

Selective Recovery of Pure Copper Nanopowder From Indium-Tin-Oxide Etching Wastewater by Various Wet Chemical Reduction Process: Understanding Their Chemistry and Comparisons of Sustainable Valorization Processes

Basudev Swain, Chinmayee Mishra, Hyun Seon Hong, Sung-Soo Cho

Environ Res. 2016 May;147:249-58.

PMID: 26918838

Abstract:

Sustainable valorization processes for selective recovery of pure copper nanopowder from Indium-Tin-Oxide (ITO) etching wastewater by various wet chemical reduction processes, their chemistry has been investigated and compared. After the indium recovery by solvent extraction from ITO etching wastewater, the same is also an environmental challenge, needs to be treated before disposal. After the indium recovery, ITO etching wastewater contains 6.11kg/m(3) of copper and 1.35kg/m(3) of aluminum, pH of the solution is very low converging to 0 and contain a significant amount of chlorine in the media. In this study, pure copper nanopowder was recovered using various reducing reagents by wet chemical reduction and characterized. Different reducing agents like a metallic, an inorganic acid and an organic acid were used to understand reduction behavior of copper in the presence of aluminum in a strong chloride medium of the ITO etching wastewater. The effect of a polymer surfactant Polyvinylpyrrolidone (PVP), which was included to prevent aggregation, to provide dispersion stability and control the size of copper nanopowder was investigated and compared. The developed copper nanopowder recovery techniques are techno-economical feasible processes for commercial production of copper nanopowder in the range of 100-500nm size from the reported facilities through a one-pot synthesis. By all the process reported pure copper nanopowder can be recovered with>99% efficiency. After the copper recovery, copper concentration in the wastewater reduced to acceptable limit recommended by WHO for wastewater disposal. The process is not only beneficial for recycling of copper, but also helps to address environment challenged posed by ITO etching wastewater. From a complex wastewater, synthesis of pure copper nanopowder using various wet chemical reduction route and their comparison is the novelty of this recovery process.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP50926119-A	Indium tin oxide, dispersion		50926-11-9	Price

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