Colorimetric Detection of Chromium(VI) Ions in Water Using Unfolded-Fullerene Carbon Nanoparticles

Water pollution caused by hexavalent chromium (Cr(VI)) ions represents a serious hazard for human health due to the high systemic toxicity and carcinogenic nature of this metal species. The optical sensing of Cr(VI) through specifically engineered nanomaterials has recently emerged as a versatile st...

Full description

Saved in:
Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2021-09, Vol.21 (19), p.6353
Main Authors: Babazadeh, Saeedeh, Bisauriya, Ramanand, Carbone, Marilena, Roselli, Ludovica, Cecchetti, Daniele, Bauer, Elvira Maria, Sennato, Simona, Prosposito, Paolo, Pizzoferrato, Roberto
Format: Article
Language:English
Subjects:
Absorbance
Absorption spectra
Carbon
Carbon dots
carbon nanomaterials
Carcinogens
Chemicals
Colorimetry
Deionization
Fullerenes
Heavy metals
Hexavalent chromium
Ion concentration
Laboratories
Nanomaterials
Nanoparticles
Optical properties
optical sensing
Quantum dots
Selectivity
Water pollution
Water quality
Water sampling
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Water pollution caused by hexavalent chromium (Cr(VI)) ions represents a serious hazard for human health due to the high systemic toxicity and carcinogenic nature of this metal species. The optical sensing of Cr(VI) through specifically engineered nanomaterials has recently emerged as a versatile strategy for the application to easy-to-use and cheap monitoring devices. In this study, a one-pot oxidative method was developed for the cage opening of C60 fullerene and the synthesis of stable suspensions of N-doped carbon dots in water–THF solutions (N-CDs-W-THF). The N-CDs-W-THF selectively showed variations of optical absorbance in the presence of Cr(VI) ions in water through the arising of a distinct absorption band peaking at 550 nm, i.e., in the transparency region of pristine material. Absorbance increased linearly, with the ion concentration in the range 1–100 µM, thus enabling visual and ratiometric determination with a limit of detection (LOD) of 300 nM. Selectivity and possible interference effects were tested over the 11 other most common heavy metal ions. The sensing process occurred without the need for any other reactant or treatment at neutral pH and within 1 min after the addition of chromium ions, both in deionized and in real water samples.
ISSN:1424-8220
1424-8220
DOI:10.3390/s21196353