3D-printed lab-in-a-syringe voltammetric cell based on a working electrode modified with a highly efficient Ca-MOF sorbent for the determination of Hg(II)

Christos Kokkinos, Anastasios Economou, Anastasia Pournara, Manolis Manos, Ioannis Spanopoulos, Mercouri Kanatzidis, Thomais Tziotzi, Valeri Petkov, Antigoni Margariti, Panagiotis Oikonomopoulos, Giannis S. Papaefstathiou

Research output: Contribution to journalArticle

Abstract

This work combines, for the first time, 3D-printing technology and a highly efficient metal organic framework (Ca-MOF) as an electrode modifier to produce a novel fully integrated lab-in-a-syringe device for the sensitive determination of Hg(II) by anodic stripping voltammetry. The specific Ca-MOF ([Ca(H4L)(DMA)2]·2DMA where H6L is the N,N’-bis(2,4-dicarboxyphenyl)-oxalamide and DMA is the N,N-dimethylacetamide) shows an exceptional Hg(II) sorption capability over a wide pH range and its mechanism is elucidated via spectroscopic and X-ray diffraction studies. The voltammetric lab-in-a-syringe device is fabricated through a single-step process using a dual extruder 3D printer and is composed of a vessel integrating two thermoplastic conductive electrodes (serving as the counter and pseudo-reference electrodes) and of a small detachable 3D-printed syringe loaded with a graphite paste/Ca-MOF mixture (which serves as the working electrode). After optimization of the fabrication and operational variables, a limit of detection of 0.6 μg L−1 Hg(II) was achieved, which is comparable or lower than that of existing sensors (plastic 3D-printed, gold and MOF-based electrodes). The adoption of 3D printing technology in combination with the highly efficient Ca-MOF enables the fabrication of a simple, low-cost and sensitive electrochemical sensor for Hg(II), which is suitable for on-site applications.

Original languageEnglish
Article number128508
JournalSensors and Actuators, B: Chemical
Volume321
DOIs
Publication statusPublished - Oct 15 2020

Keywords

  • 3D-printed electrode
  • Electrochemical sensing
  • Mercury
  • Metal-organic frameworks
  • Sorption

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

Fingerprint Dive into the research topics of '3D-printed lab-in-a-syringe voltammetric cell based on a working electrode modified with a highly efficient Ca-MOF sorbent for the determination of Hg(II)'. Together they form a unique fingerprint.

  • Cite this

    Kokkinos, C., Economou, A., Pournara, A., Manos, M., Spanopoulos, I., Kanatzidis, M., Tziotzi, T., Petkov, V., Margariti, A., Oikonomopoulos, P., & Papaefstathiou, G. S. (2020). 3D-printed lab-in-a-syringe voltammetric cell based on a working electrode modified with a highly efficient Ca-MOF sorbent for the determination of Hg(II). Sensors and Actuators, B: Chemical, 321, [128508]. https://doi.org/10.1016/j.snb.2020.128508