2009
DOI: 10.1021/es8036669
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Ferrous and Ferric Ion Generation During Iron Electrocoagulation

Abstract: Our research on arsenate removal by iron electrocoagulation (EC) produced highly variable results, which appeared to be due to Fe2+ generation without subsequent oxidation to Fe3+. Because the environmental technology literature is contradictory with regard to the generation of ferric or ferrous ions during EC, the objective of this research was to establish the iron species generated during EC with iron anodes. Experimental results demonstrated that Fe2+, not Fe3+, was produced at the iron anode. Theoretical … Show more

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Cited by 270 publications
(142 citation statements)
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“…This trend is also observed in the changes in turbidity, total phosphorus level, and colour. These results quite agree with the explanation by Lakshmanan et al [13] that the coagulation of ferrous ion reaches the maximum efficiency at pH range from 8.8 to 11.5; at the pH values, ferrous ions mainly exist in the form of Fe(OH) 2 and show effectiveness in treatment (Figure 3). The pH value also quite matches with the earlier research by Sanghi et al [12] on textile wastewater treatment at pH 9.5.…”
Section: Effects Of Phsupporting
confidence: 92%
“…This trend is also observed in the changes in turbidity, total phosphorus level, and colour. These results quite agree with the explanation by Lakshmanan et al [13] that the coagulation of ferrous ion reaches the maximum efficiency at pH range from 8.8 to 11.5; at the pH values, ferrous ions mainly exist in the form of Fe(OH) 2 and show effectiveness in treatment (Figure 3). The pH value also quite matches with the earlier research by Sanghi et al [12] on textile wastewater treatment at pH 9.5.…”
Section: Effects Of Phsupporting
confidence: 92%
“…HFO generated in SBGW without arsenic), was highly sensitive to ps-HFO age. Freshly prepared ps-HFO brought into contact with arsenic immediately after generation reduced 600 µg/L arsenic (half [35] and [15] [36] indicating minimal direct As [III] adsorption.…”
Section: Arsenic Removal With Pre-synthesized Hfomentioning
confidence: 99%
“…Previous EC research has largely focused on charge loading or current density (due to its affect on charge loading) as the main variable controlling arsenic removal. [10,13,15,22,23] The effect of dosage rate on either removal or time is rarely mentioned. This omission is despite the effect of dosage rate on 5 the average contact time between arsenic and HFO in solution, in addition to possible effects on the rate of As[III] oxidation, making it critical to understand EC performance and mechanisms.…”
Section: Introductionmentioning
confidence: 99%
“…It is interesting to note that another technology, electrocoagulation [31][32][33], using Fe 0 could exhibit similar efficiency for a large spectrum of contaminants. Iron electrocoagulation can be considered an electrochemically driven accelerated corrosion process.…”
Section: Mechanisms Of Contaminant Removal In Fe 0 /H 2 O Systemsmentioning
confidence: 99%