2011
DOI: 10.1002/cjce.20454
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Oxidation of sulfide ion in synthetic geothermal brines at carbon‐based anodes

Abstract: Geothermal brines associated with natural gas extraction present an environmental problem because of the need to avoid the escape of toxic and odorous hydrogen sulfide. In this work, carbon-based anodes (including graphite, granulated activated carbon (GAC), and industrial coke) were used in the electrochemical oxidation of sulfide ion in synthetic geothermal brines in both batch and flow cells, with a view to remediating this troublesome contaminant. Experiments were carried out in alkaline solution (to preve… Show more

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Cited by 15 publications
(11 citation statements)
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“…Similar results were also obtained by other authors. 4,7,8,11,14,19,20,27,28 However, at low current density, 10 mA cm -2 , and low S 2-concentration, 10 mg L -1 , the presence of elemental sulfur was not observed. 22 In this study, besides the formation of sulfur on the anode's surface, it was also observed the development of a yellow color in the solution.…”
Section: 27mentioning
confidence: 99%
“…Similar results were also obtained by other authors. 4,7,8,11,14,19,20,27,28 However, at low current density, 10 mA cm -2 , and low S 2-concentration, 10 mg L -1 , the presence of elemental sulfur was not observed. 22 In this study, besides the formation of sulfur on the anode's surface, it was also observed the development of a yellow color in the solution.…”
Section: 27mentioning
confidence: 99%
“…Moreover, a study on the factors affecting the electrochemical reactivity of the FeS x particulates has yet to be undertaken. Several electrode materials, such as graphite rods, plates and granules, 6,15,21,22 and electrodes containing precious metals such as platinum, 17,23,24 nickel, 9,25 and titanium, 14,16,26,27 have been studied for electrochemical sulfide oxidation at laboratory scale. Similarly, work on the electrochemical detection and characterization of FeS nanoparticles on mercury and gold electrodes has recently been published.…”
Section: ■ Introductionmentioning
confidence: 99%
“…Compared to other methods for the removal of wastewater sulfide, electrochemical techniques offer advantages in terms of selectivity, energy efficiency, and chemical consumption. Sulfide is an electro-active compound and can be removed by electrochemical oxidation on a variety of anode materials. Depending on the anode materials and imposed potentials, aqueous sulfide can be electrochemically oxidized to elemental sulfur (S 0 ), polysulfides (S n 2– ), sulfate (SO 4 2– ), sulfite (SO 3 2– ), and thiosulfate (S 2 O 3 2– ) . Elemental sulfur has been the only final oxidation product in a number of studies with carbon/graphite anode materials. ,,, The electrochemical oxidation of pyrite (FeS 2 ) electrodes in aqueous acidic solutions has also been demonstrated. , Liu and co-workers reported very slow oxidation and reduction rates for pyrite between −0.36 and +0.84 V vs SHE with current densities of less than 0.048 mA/cm 2 .…”
Section: Introductionmentioning
confidence: 99%
“…Hydrogen sulfide is largely produced in the so-called hydrogen desulfurization (HDS) process for purification of oil [1,2], but also present in significant concentration in industrial off-gas of, e.g., steel manufacturing. Hydrogen sulfide is highly toxic and odorous [3,4]. Efficient and safe isolation using absorption, followed by desorption and conversion in the (super) Claus process, is therefore crucial [5].…”
Section: Introductionmentioning
confidence: 99%
“…It is much more appealing to utilize the chemically bound hydrogen in H 2 S to electrochemically form H 2 . This requires anodic electrochemical oxidation of the sulfide ion, which has been investigated for purification of geothermal brines that accompany oil and gas extraction [4]. Bunce et al [6] reported that the oxidation of sulfide ion at a boron-doped diamond (BDD) anode forms sulfate, with near quantitative chemical yield and current efficiency, in both the absence and presence of chloride ion.…”
Section: Introductionmentioning
confidence: 99%