Ti-Catalyst Biomimetic Sensor for the Detection of Nitroaromatic Pollutants

Abstract : An electrode modified by a Ti complex in Nafion was used in the electrochemical detection of nitroaromatic compounds (NACs). The catalyst reduced nitroaromatic groups by a six-electron process with a high apparent rate constant, k1, which was estimated to be at least 19 000 mol–1 L s–1 by simulation of the first step of the cathodic reduction of 4-nitrophenylacetic acid, which was used as model molecule. The modified electrode was prepared and optimized in terms of Nafion and catalyst concentrations. In the chosen analytical medium, the Ti-catalyst-containing electrode showed good stability in the presence of nitro species. A standard deviation around 15% was calculated on the analysis performed with 28 different modified electrodes, which could be expected for a drop-coating process. We show that the modified electrode detects several nitroaromatic compounds such as nitrophenols, mononitroaniline, and dinitrotoluene with detection limits ranging from 1 × 10–4 to 9 × 10–4 g L–1 (0.2 × 10–6 to 5.1 × 10–6 mol L–1). As an interesting feature, the sensor exhibits good selectivity toward NAC detection because titanocene does not catalyze the reduction of nitroaliphatic compounds.
Complete list of metadatas

Cited literature [20 references]  Display  Hide  Download

https://hal-univ-rennes1.archives-ouvertes.fr/hal-02015559
Contributor : Laurent Jonchère <>
Submitted on : Thursday, February 14, 2019 - 11:19:45 AM
Last modification on : Wednesday, June 26, 2019 - 10:29:52 AM
Long-term archiving on : Wednesday, May 15, 2019 - 7:42:21 PM

File

Lemaire et al_2019_Ti Catalyst...
Files produced by the author(s)

Identifiers

Citation

Alizée Lemaire, Philippe Hapiot, Florence Geneste. Ti-Catalyst Biomimetic Sensor for the Detection of Nitroaromatic Pollutants. Analytical Chemistry, American Chemical Society, 2019, 91 (4), pp.2797-2804. ⟨10.1021/acs.analchem.8b04671⟩. ⟨hal-02015559⟩

Share

Metrics

Record views

74

Files downloads

4