Photoelectrochemical Behaviour of Fe(CN)6(4-)/Fe(CN)6(3-) at Passive Iron Electrodes in Borate Solution.

Arsenic (As) is a naturally occurring element in the environment that poses significant risks to human health. Several treatment technologies have been successfully used in the treatment of As-contaminated waters. However, limited literature has explored advanced electrocoagulation (EC) processes for As removal. The present study evaluates the As removal performance of electrocoagulation, electrochemical peroxidation (ECP), and photo-assisted electrochemical peroxidation (PECP) technologies at circumneutral pH using electroactive iron electrodes. The influence of As speciation and the role of oxidants in As removal were investigated. We have identified the ECP process to be a promising alternative for the conventional EC with around 4-fold increase in arsenic removal capacity at a competitive cost of 0.0060 $/m3. Results also indicated that the rate of As(III) oxidation at the outset of electrochemical treatment dictates the extent of As removal. Both ECP and PECP processes reached greater than 96% As(III) conversion at 1 C/L and achieved 86% and 96% As removal at 5 C/L, respectively. Finally, the mechanism of As(III) oxidation was evaluated, and results showed that Fe(IV) is the intermediate oxidant generated in advanced EC processes, and the contribution of •OH brought by UV irradiation is insignificant.

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Standardizing electrocoagulation reactor design: Iron electrodes for NOM removal

Chemosphere ◽

10.1016/j.chemosphere.2012.11.075 ◽

2013 ◽

Vol 91 (1) ◽

pp. 55-60 ◽

Cited By ~ 28

Author(s):

Kristian L. Dubrawski ◽

Madjid Mohseni

Keyword(s):

Reactor Design ◽

Iron Electrodes

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An analysis of transient photocurrents measured on passivated iron electrodes

Corrosion Science ◽

10.1016/0010-938x(90)90186-9 ◽

1990 ◽

Vol 31 ◽

pp. 715-720 ◽

Cited By ~ 15

Author(s):

Kazuhisa Azumi ◽

Toshiaki Ohtsuka ◽

Norio Sato

Keyword(s):

Iron Electrodes

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Carbonyl-Iron Electrodes for Rechargeable-Iron Batteries

Electrochemical Energy Technology ◽

10.2478/eetech-2014-0002 ◽

2015 ◽

Vol 1 (1) ◽

Cited By ~ 5

Author(s):

A. Sundar Rajan ◽

M. K. Ravikumar ◽

K. R. Priolkar ◽

S. Sampath ◽

A. K. Shukla

Keyword(s):

Carbonyl Iron ◽

Large Scale ◽

Low Cost ◽

Specific Capacity ◽

Electrical Energy ◽

Slow Increase ◽

Faradaic Efficiency ◽

Nickel Iron ◽

In Situ Xrd ◽

Iron Electrodes

AbstractNickel-iron and iron-air batteries are attractive for large-scale-electrical-energy storage because iron is abundant, low-cost and non-toxic. However, these batteries suffer from poor charge acceptance due to hydrogen evolution during charging. In this study, we have demonstrated iron electrodes prepared from carbonyl iron powder (CIP) that are capable of delivering a specific discharge capacity of about 400 mAh g−1 at a current density of 100 mA g−1 with a faradaic efficiency of about 80%. The specific capacity of the electrodes increases gradually during formation cycles and reaches a maximum in the 180th cycle. The slow increase in the specific capacity is attributed to the low surface area and limited porosity of the pristine CIP. Evolution of charge potential profiles is investigated to understand the extent of charge acceptance during formation cycles. In situ XRD pattern for the electrodes subsequent to 300 charge/discharge cycles confirms the presence of Fe with Fe(OH)2 as dominant phase.

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A COMPARISON BETWEEN ALUMINIUM AND IRON ELECTRODES IN ELECTROCOAGULATION PROCESS FOR GLYPHOSATE REMOVAL

Jurnal Teknologi ◽

10.11113/jt.v77.6982 ◽

2015 ◽

Vol 77 (32) ◽

Cited By ~ 2

Author(s):

Rabiatuladawiyah Danial ◽

Luqman Chuah Abdullah ◽

Mohsen Nourouzi Mobarekeh ◽

Shafreeza Sobri ◽

Nordayana Mohd Adnan

Keyword(s):

Charged Particles ◽

Deionized Water ◽

Water Production ◽

Batch Mode ◽

Initial Concentration ◽

Iron Electrodes ◽

Metal Plates ◽

Aqueous Environments ◽

Electrocoagulation Process ◽

Set Up

This study was intended to compare the performance of electrocoagulation process using aluminium and iron electrodes for glyphosate removal in aqueous solution. The effects of initial glyphosate concentration, electrocoagulation time and distance between electrodes, were discussed in detail. An electrocoagulation tank of 500mL with two metal plates electrodes, same in dimensions and metal types, was set up to perform batch mode laboratory experiment and the glyphosate in white powder was first diluted with deionized water. Production of metal cations showed an ability to neutralize negatively charged particles, which then encouraged to bind together to form aggregates of flocs composed of a combination of glyphosate and metal hydroxide. Compared with iron electrodes, aluminium electrodes were more effective for glyphosate removal, with a removal efficiency of over than 80%. This study revealed that electrocoagulation process using aluminium electrodes is reliable, especially designed for initial concentration 100 mg/L, electrocoagulation time 50 min, and distance between electrodes 6 cm. Finally, it can be concluded that electrocoagulation process using aluminium electrodes is efficient for glyphosate removal from aqueous environments.

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