Electrochemical Reduction and Detection of Nitrobenzene Based on Porphyrin Composite-modified Glassy Carbon Electrode

Abstract

An electrocatalytic platform and electrochemical sensor for nitrobenzene using tetra(4-methoxyphenyl) porphyrin-functionalized N-doped ordered mesoporous carbon (TMPP/N-OMC) as sensitive material is reported. Glassy carbon electrodes modified with TMPP/N-OMC were characterized by scanning electron microscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. The electrode shows high electrocatalytic activity towards the reduction of nitrobenzene in sodium chloride solution (pH 7.00). Electrocatalytic reduction currents of nitrobenzene were found to be linearly related to concentration over the range 0.528 to 132.00 μM with a correlation coefficient of 0.9971 using a differential pulse voltammogram method. The detection limits were determined as 0.2162 μM at a signal-to-noise ratio of 3. The results show TMPP/N-OMC-modified glassy carbon electrodes open new opportunities for fast, simple, and sensitive field analysis of nitrobenzene.

Electrogenerated Thin Films of Microporous Polymer Networks with Remarkably Increased Electrochemical Response to Nitroaromatic Analytes

“…The observed effect may be driven by intermolecular interactions between the high surface of the electron-rich carbazole-based microporous polymer networks and the electron-poor nitroaromatic analytes resulting in a thin adsorbate layer. For mesoporous phorphyrin-based materials the occurrence of π–π interactions with NACs has been postulated. , Our results are also consistent with such an assumption due to the correlation between the surface area of the MPN films and the electrochemical response. The best results are obtained for coatings based on the tetracarbazolyl-substituted monomers that show the highest specific surface areas.…”

“…For mesoporous phorphyrin-based materials the occurrence of π−π interactions with NACs has been postulated. 38,39 Our results are also consistent with such an assumption due to the correlation between the surface area of the MPN films and the electrochemical response. The best results are obtained for coatings based on the tetracarbazolylsubstituted monomers that show the highest specific surface areas.…”

Electrocatalytic reduction of trace nitrobenzene using a graphene-oxide@polymerized-manganese-porphyrin composite

“…It has been found from a large number of literatures that the optimum range of pH response for nitroaromatic compounds is between 6 and 8. [31][32][33][34][35][36][37][38] In order to investigate the effect of pH value on the sensitivity of GMPP@AMP/GCE for the detection of trace nitrobenzene, cyclic voltammetry (CV) was performed for the buffer of sodium hydrogen phosphate/sodium dihydrogen phosphate (PBS) in the range of pH 6-8 ( Fig. 5).…”

Phase transformation-controlled synthesis of CuO nanostructures and their application as an improved material in a carbon-based modified electrode

“…The resistance of a modied electrode may be changed due to the modier on the electrode surface. [43][44][45] Electrochemical impedance spectroscopy (EIS) is an efficient and facile tool for studying the interface properties of the capability of electron transfer. 46 As reported and well known, the charge-transfer resistance (R ct ) of a certain electrode is equal to the semicircle diameter of EIS and can be used to describe the electrical conductivity properties of the electrode interface.…”