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Recovery of Indium from Etching Wastewater Using Supercritical Carbon Dioxide Extraction by Hui-Ming Liu; Chia-Chan Wu; Yun-Hua Lin; Chien-Kai Chiang is a Environmental Science article available to read on EtoBox.

What is Recovery of Indium from Etching Wastewater Using Supercritical Carbon Dioxide Extraction about?

This study presents supercritical carbon dioxide (scCO 2 ) extraction as an inherently safer and cleaner method for the recovery of indium (In) from the real etching wastewater obtained from indium tin oxide (ITO) etching process. Efficient chelation-supercritical fluids extraction (SFE) from etching wastewater was obtained at 80 • C, a pressure of 20.7 MPa, and with 15 min static extractions followed by 15 min dynamic extraction. The extractions were performed using unmodified scCO 2 in the presence of the fluorinated ␤-diketone chelating agent, 2,2-dimethyl-6,6,7,7,8,8,8-heptafluoro-3,5-octanedione (HFOD). Percentages of indium recovery from etching wastewater were between 90.8% and 100.3% (n = 6) with relative standard deviations of <10%. The accuracy of the procedure was confirmed by determining indium levels in a single element standard solution. The developed method was applied to the analysis of real etching wastewater samples as well as to a commercially available ITO etching reagent (ITO-06SD) with satisfactory results.

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Author

Hui-Ming Liu; Chia-Chan Wu; Yun-Hua Lin; Chien-Kai Chiang

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0304-3894)

Published

2009

Language

EN

Field

Environmental Science (Physical Sciences)