Electrochemical simultaneous determination of nitrophenol isomers at nano-gold modified glassy carbon electrode

Abstract

A novel method for simultaneous determination of nitrophenol isomers at nano-gold modified glassy carbon electrode has been developed. The gold nanoparticles were directly electrodeposited onto the glassy carbon electrode via a constant potential -0.2 V (vs. SCE) for 60 s from 0.1 mol L -1 KNO 3 containing 0.4 g L -1 HAuCl 4 . The resulting electrode (nano-Au/GCE) was characterized with scanning electron microscopy (SEM). The electrochemistry response of nitrophenol isomers at the nano-Au/GCE was studied. The result indicated that o-, m-, and p-nitrophenol are separated entirely at nano-Au/GCE, and a semi-derivative voltammetric technology was adopted to enhance the determination sensitivity. This modified electrode could be applied to direct simultaneous voltammetric determination of nitrophenol isomers in water samples without preseparation with higher sensitivity.

An electrochemical sensor based on polyelectrolyte-functionalized graphene for detection of 4-nitrophenol

“…For better comparison of the present work with some of the earlier reports, different catalysts employed for the catalytic reduction of 4-NP are enumerated in Table 1. It is evident from Table 1 that PDDA-G nanocomposite in this work has a wider linear range and lower detection limit [47][48][49][50][51][52][53][54]. The superior performance of the prepared sensor was due to the adsorption ability of PDDA-G.…”

Semi-differential analysis of irreversible voltammetric peaks

“…Various electrochemical processes, such as redox reactions with reduced and oxidised species present in the same phase [6,14,[21][22][23][24][25][26][27][28][29][30][31][32][33][34][35], adsorption on surfaces of electrodes [36][37][38], electrodeposition [39][40][41][42][43][44][45][46][47][48] or electrodissolution [49][50][51] were analysed by means of semi-differentiation or semi-integration. The most extensive mathematical treatment related to these methods was applied to the electrochemical reactions were both oxidised and reduced form are soluble in the electrolyte phase and their transport proceeds under conditions of semi-infinite linear diffusion [4].…”

Electrochemical Determination of Phenylethanolamine A Based on Nafion/MWCNTs/AuNPs Modified Carbon Electrode

“…[10] Carbon nanotubes are another novel and interesting nanomaterial first discovered in 1991 by Iijima [11] and they are divided into two categories: single-wall carbon nanotubes and multiwalled carbon nanotubes (MWCNTs) depending on the amount of layers. MWCNTs, with unique electronic, chemical properties and large surface, possess strong electrocatalytic activity and can effectively absorb organic compounds that do not exhibit surface-active properties at conventional electrodes.…”