Journal
TALANTA
Volume 147, Issue -, Pages 547-555Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2015.10.030
Keywords
Paranitrophenol; Electroreduction; Organosmectite; Film modified electrode; Voltammetric detection
Categories
Funding
- Academy of Science for the Developing World [12-117 RG/CHE/AF/AC-G, 07-052-LDC/CHE/AF/AC]
Ask authors/readers for more resources
This work describes the development of a low-cost and reliable adsorptive stripping voltammetric method for the detection of PNP in water. Organoclays were prepared by intercalation in various loading amounts of cetyltrimethylammonium ions (CFA) in the interlayer space of a smectite-type clay mineral. Their structural characterization was achieved using several techniques including X-ray diffraction (XRD), N-2 adsorption-desorption (BET method) and Fourier Transform Infrared spectroscopy (FTIR) that confirmed the intercalation process and the presence of the surfactant ions within the clay mineral layers. Using [Fe(CN)(6)](3-) and [Ru(NH3)(6)](3+) as redox probes, the surface charge and the permeability of the starting clay mineral and its modified counterparts were assessed by multisweep cyclic voltammetry, when these materials were coated on the surface of a glassy carbon electrode (GCE). In comparison with the bare GCE, the organoclay modified electrodes exhibited more sensitive response towards the reduction of paranitrophenol (PNP). Under optimized conditions, a calibration curve was obtained in the concentration range from 0.2 to 5.2 gmol L-1; leading to a detection limit of 3.75 x 10(-8) mol L-1 (S/N=3). After the study of some interfering species on the electrochemical response of PNP, the developed sensor was successfully applied to the electroanalytical quantification of the same pollutant in spring water. (C) 2015 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available