Naked Eye and Selective Detection of Copper(II) in Mixed Aqueous Media Using a Cellulose-based Support

Abstract

A new colorimetric sensor based-azo dye for Cu²⁺ detection was synthesized and characterized by FTIR and NMR spectroscopies. The results showed that the azo dye had a high selective and sensitive recognition toward Cu²⁺. The solution containing the sensor changed color from pink to pale yellow with a hypsochromic shift in the presence of Cu²⁺. The sensor selectivity and sensitivity toward Cu²⁺ ions were investigated by colorimetry and UV-Vis spectroscopy. For practical applications, a cellulosic textile test strip for high-selectivity detection of Cu²⁺ ions in aqueous solution was developed using the synthesized azo dye as chromogenic chemosensor molecule, while using a solid cellulose textile as a substrate. As a result, a spectacular color change of the test strip was observed depending on the amount of copper ions in contact with the strip, which allows an estimation of Cu²⁺ concentration by naked eye.

Keywords

Copper(II) ions detection / Azo dye / Chromogenic chemosensor / Cellulose-based probe

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