Title:
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)
Languages of Item:
English
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)]center dot 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 Xray 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 mu g 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.
Authors:
Christos Kokkinos
Anastasios Economou
Anastasia Pournara
Manolis Manos
Ioannis Spanopoulos
Mercouri Kanatzidis
Thomais Tziotzi
Valeri Petkov
Antigoni Margariti
Panagiotis Oikonomopoulos
Giannis S. Papaefstathiou
Journal:
Sensors and Actuators B: Chemical
Keywords:
Metal-organic frameworks, 3D-printed electrode, Electrochemical sensing, Sorption, Mercury
Main subject category:
Science
Official URL (Publisher):
DOI:
10.1016/j.snb.2020.128508
