The catalytic activity of vanadium pentoxide film modified electrode on the electrochemical oxidation of hydrogen sulfide in alkaline solutions

Removals of aqueous sulfur dioxide and hydrogen sulfide using CeO2-NiAl-LDHs coating activated carbon and its mix with carbon nano-tubes

“…On the other hand, electrochemical oxidation treatment offers an environmentally attractive method to remove SO 2 and H 2 S [23][24][25][26][27][28][29][30][31][32][33]6,34,11,[35][36][37]. Many researches have related the redox of SO 2 and oxidation of H 2 S (sulfide) [23].…”

“…SO 2 could be oxidized to sulfuric acid [24], and reduced to elemental sulfur [23] or polysulfides [25]. The oxidation product of H 2 S (S 2− ) could be elemental sulfur [27][28][29]11], SO 3 2− [30,33] or a mix of S, S 2 2− and SO 4 2− [32]. The electrode materials involved in carbon [24], Pt [23,25] [6], cobalt pentacyanonitrosylferrate [34], Fe and Ti mix metal oxide [11], 2,6-dichlorophenolindophenol [33], N,N-diphenyl-pphenylenediamine [35], 2-(4-fluorophenyl)indole-modified xerogel [36] and hematoxylin [37].…”

Flow Injection Amperometric Detection of Sulfide Using a Prussian Blue Modified Glassy Carbon Electrode

“…Electrochemical techniques, however, have some advantages, such as easy application, lower cost and providing direct, sensitive and fast detection of lower concentrations of H2S. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] The direct electrochemical oxidation of sulfide is highly irreversible with a great overpotential at bare electrodes. Additionally, the oxidized products of sulfide can be adsorbed on the electrode surface, which may result in fouling and passivation of the electrode surface, leading to poor sensitivity, poor selectivity and unstable analytical signals.…”

“…In order to overcome these problems, modifications of the electrode surface with redox mediators have been extensively used. Amperometric redox mediators based sensors, which used ferricyanide, [7][8][9] ferrocene carboxylate, 10 ferrocenesulfonate, 11,12 N,N-diphenylp-phenylenediamine, 13 cobalt pentacyanonitrosylferrate, 14 vanadium pentoxide, 15 cinder/tetracyano nikelate, 16 hexadecylpyridiniumbis(chloranilato)-antimonyl(V), 17 2,6-dichlorophenolindophenol 18 and 2-(4-fluorophenyl)indolemodified xerogel, 19 have been applied recently.…”

Highly Stable Polymeric Ionic Liquid Modified Electrode to Immobilize Ferricyanide for Electroanalysis of Sulfide

“…Nonetheless, even with its low solubility in water, it is difficult to retain the long-term stability of the RTIL thin film. In this study, we report an easy and reliable method to improve the stability of the RTILmodified electrode by preparing a hydrophobic IL polymer film cross-linked between 1-butyl-3-vinylimidazolium hexafluorophosphate ([C 4 Various chemically modified electrodes based on different modifiers, e.g., preoxidized nickel, vanadium pentoxide, palladium, copper, silver, mercury, and cobalt pentacyanonitrosylferrate film deposited electrodes, were reported for the sulfide assays [7][8][9][10][11][12][13][14][15][16][17]. Although a wide range of protocols is available for the detection of sulfide, direct electrochemical detection particularly by an amperometric technique is comparatively sensitive, fast, and simple [18].…”