p-nitrophenol electro-oxidation on a BTMA+-bentonite-modified electrode
Abu Rabi-Stanković, A. (University of Belgrade. Technology and Metallurgy, Department of Catalysis and Chemical Engineering)
Milutinović-Nikolić, A. (University of Belgrade. Technology and Metallurgy, Department of Catalysis and Chemical Engineering)
Jović-Jovičić, N. (University of Belgrade. Technology and Metallurgy, Department of Catalysis and Chemical Engineering)
Banković, P. (University of Belgrade. Technology and Metallurgy, Department of Catalysis and Chemical Engineering)
Žunić, M. (University of Belgrade. Technology and Metallurgy, Department of Catalysis and Chemical Engineering)
Mojović, Z. (University of Belgrade. Technology and Metallurgy, Department of Catalysis and Chemical Engineering)
Jovanović, D. (University of Belgrade. Technology and Metallurgy, Department of Catalysis and Chemical Engineering)

Data:	2012
Resum:	Phenol and its derivatives are regarded as 'priority pollutants' and p-nitrophenol (p-NP), in particular, is of great interest due to its toxicity and frequent presence in waste waters and fresh waters. Straightforward, inexpensive methods to identify p-NP in water, however, is lacking. In the present study, an electrochemical technique using clay-modified electrodes to measure p-NP was investigated as a potentially promising method to fill that gap. A glassy carbon electrode (GCE) was modified with a thin layer of Na-enriched bentonite and a series of benzyltrimethylammonium (BTMA)-bentonites (BTMA-B) in order to confirm these materials as p-NP electrosensitive. A series of organobentonites was synthesized using different BTMA/bentonite ratios. The materials obtained were characterized using X-ray diffraction, Fourier-transform infrared spectroscopy, and a low-temperature nitrogen adsorptiondesorption method. A monolayer arrangement of BTMA within the interlamellar region of beidellite-rich smectite was confirmed. Deterioration of the textural properties was observed with increase of BTMA loading. The electro-oxidation of p-NP in an acidic medium on BTMA-B-modified GCE was investigated. The cyclic voltammetry method with a three-electrode cell was used. The reference electrode was Ag/AgCl in 3 M KCl and a Pt foil was the counter electrode. For each electrochemical measurement, a different BTMA loading in BTMA-B was used as the material for GCE coating and applied as the working electrode. The electrochemical activity of BTMA-B-based electrodes increased with BTMA loading. The results confirmed that the organophylic character of the BTMA-B-modified surface was the main influence on the electrochemical activity of the BTMA-B-based GCE; the influence of textural properties was almost negligible. The increased electrode activity toward p-NP was achieved by the adsorption of p-NP on the electrode surface, the process that commonly precedes the electro-oxidation. The present study showed that synthesized materials could potentially be used in an electrochemical test for the presence of p-NP in water solutions.
Drets:	Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	BTMA+-bentonite ; Cyclovoltammetry ; Electrochemical Properties ; Modified Electrode ; Para-nitrophenol ; Priority Pollutant
Publicat a:	Clays and Clay Minerals, Vol. 60, Núm. 3 (2012) , p. 291-299, ISSN 1552-8367

DOI: 10.1346/CCMN.2012.0600306

9 p, 1.5 MB  Accés restringit a la UAB

El registre apareix a les col·leccions:
Articles > Articles de recerca
Articles > Articles publicats