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Type: Journal article
Title: Nanoporous anodic alumina rugate filters for sensing of ionic mercury: toward environmental point-of-analysis systems
Author: Kumeria, T.
Rahman, M.
Santos, A.
Ferre-Borrull, J.
Marsal, L.
Losic, D.
Citation: ACS Applied Materials and Interfaces, 2014; 6(15):12971-12978
Publisher: American Chemical Society
Issue Date: 2014
ISSN: 1944-8244
Statement of
Tushar Kumeria, Mohammad Mahbubur Rahman, Abel Santos, Josep Ferr-Borrull, Llus F. Marsal, and Dusan Losic
Abstract: Herein, we present an ultrasensitive, cost-competitive, and portable optical sensing system for detecting ionic mercury in environmental water. This analytical system combines structurally engineered and chemically modified nanoporous anodic alumina rugate filters (NAA-RFs) with reflection spectroscopy (RfS). The sensing performance of the proposed system is assessed through several tests, establishing its sensing performance (i.e., linear working range from 1 to 100 μM of Hg(2+), low limit of detection 1 μM of Hg(2+) ions (i.e., 200 ppb), and sensitivity of 0.072 nm μM(-1)), chemical selectivity (i.e., exposure to different metal ions Co(2+), Mg(2+), Ni(2+), Cu(2+), Pb(2+), Fe(3+), Ca(2+), Cr(6+), and Ag(+)) and metal ions binding mechanism (i.e., fitting to Langmuir and Freundlich isotherm models). Furthermore, the detection of Hg(2+) ions in tap and environmental water (River Torrens) is successfully carried out, demonstrating the suitability of this system for developing environmental point-of-analysis systems.
Keywords: Nanoporous anodic alumina; reflection spectroscopy; optical rugate filters; mercury ions; selective surface chemistry; environmental water
Rights: © 2014 American Chemical Society
DOI: 10.1021/am502882d
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Chemical Engineering publications

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