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Updated: Jan 10, 2026

Preparation of Expanded Chitin Foams and their Use in the Removal of Aqueous Copper
Published on: February 27, 2021
Choline chloride-phenol deep eutectic solvent-functionalized multiwalled carbon nanotubes for
Furkan Uzcan1, Ozlem Kaya2, Mustafa Soylak3
1Erciyes University, Faculty of Sciences, Department of Chemistry, 38039 Kayseri, Türkiye; Technology Research and Application Center (ERU-TAUM), Erciyes University, 38039 Kayseri, Türkiye.
Abstract:
Reliable monitoring of trace copper in food and water requires efficient and sustainable pretreatment strategies. We designed a nanocomposite sorbent in which multi-walled carbon nanotubes (MWCNTs) are conformally coated by a hydrogen-bonding deep eutectic solvent (DES) composed of choline chloride and phenol (1:2). The H-bond-mediated DES layer enriches the MWCNT surface with polar/donor sites. It enhances hydrophilicity and dispersion, thereby facilitating rapid and selective Cu(II) uptake during micro-solid phase extraction before high-resolution continuum source flame atomic absorption spectrometry (HR-CS-FAAS) determination. Under optimized conditions, the method provided high enrichment, low detection limits, and precise recoveries across representative food and water matrices while using minimal solvent volumes and low sorbent mass. By explicitly linking structure (phenol-DES coating on carbon nanotubes) to function (enhanced Cu(II) adsorption and robust μ-SPE performance), this study establishes a simple, scalable, and environmentally conscious platform for the analysis of trace copper.
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