Electrochemical production of colloidal sulphur by reduction of sulphur dioxide using a parallel plate reactor with convergent flow

Fornes, Juan Pablo; Bisang, Jose Maria

doi:10.1016/j.electacta.2015.05.120

Cited by 10 publications

(14 citation statements)

References 26 publications

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“…A filter-press-type cell is an interesting configuration in which plate-like anode and cathode chambers are parallel to each other, separated by gaskets and, in many cases, a charged, porous barrier. These cells are typically connected to a pump so that a pollutant-containing solution can be flushed into and out of the active chamber for a single pass or for multiple passes. , …”

Section: Techniques For Electrochemical Remediation: From Benchtop To...mentioning

confidence: 99%

Electroreductive Remediation of Halogenated Environmental Pollutants

et al. 2016

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Electrochemical reduction of halogenated organic compounds is gaining increasing attention as a strategy for the remediation of environmental pollutants. We begin this review by discussing key components (cells, electrodes, solvents, and electrolytes) in the design of a procedure for degrading a targeted pollutant, and we describe and contrast some experimental techniques used to explore and characterize the electrochemical behavior of that pollutant. Then, we describe how to probe various mechanistic features of the pertinent electrochemistry (including stepwise versus concerted carbon-halogen bond cleavage, identification of reaction intermediates, and elucidation of mechanisms). Knowing this information is vital to the successful development of a remediation procedure. Next, we outline techniques, instrumentation, and cell designs involved in scaling up a benchtop experiment to an industrial-scale system. Finally, the last and major part of this review is directed toward surveying electrochemical studies of various categories of halogenated pollutants (chlorofluorocarbons; disinfection byproducts; pesticides, fungicides, and bactericides; and flame retardants) and looking forward to future developments.

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Section: Techniques For Electrochemical Remediation: From Benchtop To...mentioning

confidence: 99%

Electroreductive Remediation of Halogenated Environmental Pollutants

et al. 2016

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“…It can be noted that the space time yield is similar to the value reported for the single-phase flow, but the specific energy consumption is 30% higher. This behaviour can be explained considering that the presence of the gas phase, being insulating, increases the ohmic drop in the interelectrode gap, enlarging the cell potential difference applied to the reactor, 31 and according to eqn (5), increases the specific energy consumption. Thus, from Table 1, the feasibility of a decaying swirling flow electrochemical reactor was confirmed for the generation of colloidal sulphur from two-phase systems at low gas volume flow rates.…”

Section: Studies With a Decaying Swirling Flow Reactor Under A Two-phase Flowmentioning

confidence: 99%

“…4 This product is high priced compared to other sulphur powders and can be obtained by various procedures. 5 From the electrochemical point of view, it can be generated through SO 2 cathodic reduction 6 or by sulphide anodic oxidation. 7 Electrochemical manufacturing appears as an attractive strategy because it allows sulphur compounds in effluents to be used as lowgrade raw materials, producing a recycling process.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, electrochemistry presents as its main difficulty that the sulphur generated masks the electrodes, leading to their passivation over time. 5,6 For the colloidal sulphur cathodic fabrication, the problem can be solved by incorporating ultrasonic assistance 8 or by changing the hydrodynamic conditions inducing an impingement flow that enables the removal of solid particles from the electrode surface. 9,10 On the other hand, various strategies were proposed to avoid passivation of the anode for sulphide oxidation, and have been summarised in our previous communication.…”

Section: Introductionmentioning

confidence: 99%

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Colloidal sulphur production by electrochemical oxidation of sulphide in a swirling flow reactor

et al. 2022

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“…Electrochemical processes for the removal of H 2 S are divided into two groups: direct electrochemical reactions of sulfur compounds at the electrode [1][2][3][4][5] and indirect processes that utilize electrochemically regenerated redox mediators as the oxidizing agent [6]. Ogutveren [7] and Kelsall [8] reviewed the literature available up to 2013 and suggested possible routes for future research.…”

mentioning

confidence: 99%

Feasibility of the Redox Sulfur Recovery Process using Heteropoly Molybdophosphate

Fuentes-Quezada¹,

Cuentas-Gallegos²,

Rivera³

et al. 2016

J. New Mat. Electrochem. Sys.

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The feasibility of the removal of sulfide species using acid solutions of 12-molybdophosphoric acid was studied. The key factor in this purification process is the formation of a hydrogen-bonded structure between the hydrogen sulfide species and the bridging oxygen atom of the MoO6 octahedrons of the molybdophosphate complexes. The number of bridging oxygen atoms depends of the pH. Consequently, the efficiency of the process is also largely dependent on the pH. Most of the literature focuses on the redox potentials for the purification process. The slope of the redox pair S/H2S and the molybdophosphate complexes is -59 pH/mV. The differences between the redox potentials do not fluctuate with the pH, which indicates that the oxidation of H2S by molybdophosphate complexes is spontaneous in all pH intervals but does not explain why the efficiency decreases at high pH. In summary, the Keggin-type structure contributes to the efficient removal of sulfide because this structure contains the maximum number of bridging oxygen atoms. The solubility of H2S gas is lower in acidic media. This drawback severely restricts the performance of the purification process.

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Electrochemical production of colloidal sulphur by reduction of sulphur dioxide using a parallel plate reactor with convergent flow

Cited by 10 publications

References 26 publications

Electroreductive Remediation of Halogenated Environmental Pollutants

Electroreductive Remediation of Halogenated Environmental Pollutants

Colloidal sulphur production by electrochemical oxidation of sulphide in a swirling flow reactor

Feasibility of the Redox Sulfur Recovery Process using Heteropoly Molybdophosphate

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