Choline chloride–phenol deep eutectic solvent-functionalized multiwalled carbon nanotubes for separation–Preconcentration of copper from food and water samples

UZCAN F., Kaya O., SOYLAK M.

Food Chemistry, cilt.498, 2026 (SCI-Expanded, Scopus) identifier identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 498
  • Basım Tarihi: 2026
  • Doi Numarası: 10.1016/j.foodchem.2025.147285
  • Dergi Adı: Food Chemistry
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, BIOSIS, Chemical Abstracts Core, Chimica, Compendex, EMBASE, MEDLINE
  • Anahtar Kelimeler: Copper, Deep eutectic solvent coating, Choline chloride-phenol, Hydrogen-bond network, micro-solid phase extraction, MWCNT composite
  • Erciyes Üniversitesi Adresli: Evet

Özet

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.