Preserved in Portico This version is not peer-reviewed
Detection of Heavy Metals in Water Using Graphene Quantum Dots: An Experimental and Theoretical Study
: Received: 8 July 2021 / Approved: 9 July 2021 / Online: 9 July 2021 (13:22:41 CEST)
A peer-reviewed article of this Preprint also exists.
Journal reference: Molecules 2021, 26, 5519
In this work, we investigate by ab initio calculations and optical experiments the sensitiv- ity of graphene quantum dots in their use as devices to measure the presence, and concentration, of heavy metals in water. We demonstrate that the quenching or enhancement in the optical response (absorption, emission) depends on the metallic ion considered. In particular, two test cases of opposite behaviour are considered: Cd 2+ , where we observe an increase in the optical response for increasing concentration, and Pb 2 whose emission spectra are quenched along the concentration rise. We envisage that quantum dots of graphene may be routinely used as cheap detectors to measure the degree of poisoning ions in water
Graphene oxide; Quantum Dots; TD-DFT; Absorption; Quenching effect; Concentration; Optical Response
MATERIALS SCIENCE, Biomaterials
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
We encourage comments and feedback from a broad range of readers. See criteria for comments and our diversity statement.