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|Title:||Nanoporous anodic alumina rugate filters for sensing of ionic mercury: toward environmental point-of-analysis systems|
|Citation:||ACS Applied Materials and Interfaces, 2014; 6(15):12971-12978|
|Publisher:||American Chemical Society|
|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|
|Appears in Collections:||Chemical Engineering publications|
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