An ordered mesoporous carbon modified electrochemical sensor for solid-phase microextraction and determination of triclosan in environmental samples

Abstract

Highlights We developed a simple electrochemical sensor with an ordered mesoporous carbon modified screen-printed carbon electrode to detect triclosan. CMK-3 was used for solid-phase microextraction, since it has an excellent extraction selectivity towards triclosan in water samples. The proposed sensor presented high sensitivity, low detection limit, excellent stability and reproducibility. This electrochemical platform offered a useful tool for on-site triclosan determination in environmental samples. An ordered mesoporous carbon modified electrochemical sensor for solid-phase microextraction and determination of triclosan in environmental samples

A Sensitive Electrochemical Sensor Based on Graphene Oxide Nanosheets Decorated by Fe3O4@Au Nanostructure Stabilized on Polypyrrole for Efficient Triclosan Sensing

“…The effect of potential scan rate on the electrochemical behaviour of the Fe 3 O 4 @Au‐PPy/GO GCE sensor was studied by linear sweep voltammograms at various scan rates (1 to 100 mV s −1 ) in 0.1 mol L −1 phosphate buffer solution (pH 9.0), in the presence of 15.0×10 −6 mol L −1 triclosan (Figure ). The results showed good linearity of the plots of peak current versus the square root of the scan rate (ΔI vs. v 1/2 ), meaning that the oxidation of triclosan was confirmed by the diffusion process .…”

Surface modified mesoporous nanocast carbon as a catalyst for aqueous sulfide oxidation and adsorption of the produced polysulfides

“…NC synthesis was carried out by a nanocasting process using different synthesis conditions reported elsewhere. 2,10 The NC obtained is a negative replica of the inorganic matrix. The synthesis of NC involves five main steps: (i) inorganic template synthesis, where the ordered mesoporous silica-based material SBA-15 was chosen; (ii) templated impregnation with sucrose as carbon source; (iii) polymerization; (iv) carbonization of the organic material and (v) template removal, where an acid treatment was used in this case.…”

“…The use of mesoporous silicas, e.g., SBA-15, as a template for the production of a mesoporous carbon named CMK-3 has been reported in several works. [8][9][10] These hierarchical carbon nanorods CMK-3 with a hexagonal network have been used in different applications such as adsorption, 11 catalysis, 12 gas separation process, 13 gas storage, 14 gas capture, 15 and electrodes in lithium batteries. 16 In this work, the mesoporous surface of a hierarchical carbon was modified by oxidation with HNO 3 to produce unique catalytic materials for the oxidation of sulfides in an aqueous medium.…”

Recent Trends on Electrochemical Sensors Based on Ordered Mesoporous Carbon

“…Based on the above characteristics of widely open, and thus accessible, mesoporous structures with very large surface areas, it is not so surprising that electrodes modified with OMC were characterized by important capacitive currents ( Figure 4 A) originating from electroactive areas much larger than flat electrodes of the same geometric surface, being therefore attractive for applications in supercapacitors [ 42 ], for instance. However, when applied to the electrochemical transformation of a reversible redox probe in solution (i.e., [Fe(CN) 6 ] 3−/4− system [ 43 ]), the benefit of large electroactive surface area is not overwhelming (compare curves b and c in Figure 4 B) because the overall electrochemical processes are diffusion-controlled and the slightly increased currents are simply due to the roughness of the OMC modified electrode surface. Much more improvement can be observed when considering irreversible redox species for which the electrochemical response becomes dominated by the rate of electron transfer; in that case, the presence of OMC is likely to accelerate the kinetics of charge transfer reactions, leading to both higher peak currents and lower overpotentials in comparison to the bare glassy carbon electrode (see Figure 4 C for the example of xanthine) [ 44 ].…”