The suitability of ZnO film-coated glassy carbon electrode for the sensitive detection of 4-nitrophenol in aqueous medium

Abstract

The performance of a ZnO nanoparticle-based electrochemical sensor, fabricated by different treatments of ZnO on glassy carbon electrode, was evaluated for the determination of 4-nitrophenol (4-NP) in aqueous medium.

The effect of sunlight induced surface defects on the photocatalytic activity of nanosized CeO2 for the degradation of phenol and its derivatives

“…The drop coating method was used for the modification of GCE [39,40]. The homogenized suspension of 1 mg of the photocatalyst in 1 ml of deionzed water was casted at the tip of the GCE by dropping 20 µL, dried to film by hot air drying.…”

Electrochemical Detection of 4-Nitrophenol by Using Graphene Based Nanocomposite Modified Glassy Carbon Electrodes: A Mini Review

“…Metallic nanoparticles are mainly silver nanoparticles [66] but bimetallic Au-CuNPs nanoparticles have also been applied for the electrocatalytic conversion of 4-NPh [67]. ZnONPs, CuONPs, Cu 2 ONPs, Alpha-MnO 2 NPs and Fe 3 O 4 NPs have been utilized as modified electroactive materials in the detection of 4-NPh [68][69][70][71][72]. Chitosan nanocomposites, polyaniline nanocomposite, poly (p-aminobenzene sulfonic acid) nanocomposites and poly(methylene blue) nanocomposites have also been applied for the electrocatalytic reduction 4-NPh [73][74][75][76].…”

Sunlight mediated removal of chlorophenols over tungsten supported ZnO: Electrochemical and photocatalytic studies

“…34 The photocatalytic removal of chlorophenols has been studied 35 by a number of researchers using mostly TiO 2 as a photocatalyst 36 and proposed the reaction mechanism based on their experimental 37 conditions. Almost all the researchers proposed that the degrada- 38 tion process precedes though the interaction of hydroxyl radicals 39 with the chlorophenols substrates [18,[25][26][27][28][29][30][31][32]. ZnO, with the 40 bandgap of 3.2 eV, is an important competitor of TiO 2 and 41 sometimes preferred due to its higher photon absorption cross for the characterization of new materials.…”

“…Electrochemical tools 48 such as cyclic voltammetry (CV), chronopotentiometry (CP) and 49 electrochemical impedance spectroscopy (EIS) furnish the valu- 50 able information about working potential window, photocurrent 51 density, charge-discharge performance and charge transfer resis- 52 tance. Furthermore, the analysis of the EIS Nyquist plots can 53 associate the charge transfer resistance with the separation 54 efficiency of the electron-hole pair [38][39][40]. 55 In the current study, to assess the probable behavior of the 56 synthesized W 6+ impregnated photocatalysts before being sub- important to mention here that as compared to nitrophenol 107 isomers (100 mg/100 ml) [41], a lower quantity of the catalyst was 108 appeared as the optimized amount for the degradation/minerali- ZnO surface coverage by W 6+ species.…”