Effect of operating conditions on iron corrosion rates in zero-valent iron systems for arsenic removal

Triszcz, Juan M.; Porta, Atilio Andrés; Einschlag, Fernando S. García

doi:10.1016/j.cej.2009.01.029

Cited by 118 publications

(72 citation statements)

References 34 publications

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“…As mentioned above and as previously reported by several researchers [29][30][31], the reduction rate was strongly affected by the acidity of the reaction system, i.e., pH values should also be considered in the kinetic equation of the reduction. Indeed, several other factors such as mixing rate and specific surface area of the 1% Mg/Cu bimetallic particles, can also have important effects on the reduction rate.…”

Section: Surface Characteristics Of Mg/cu Particlesmentioning

confidence: 78%

Experimental investigation of the chemical reduction of nitrate ion in aqueous solution by Mg/Cu bimetallic particles

Ramavandi

Mortazavi

Moussavi

et al. 2011

Reac Kinet Mech Cat

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Bimetallic particles have recently been used as a new means of contaminant reduction from water. Comparing with Fe 0 and Mg 0 alone, synthesized magnesium/copper (Mg/Cu) bimetallic particles have been determined to be potential and efficient agents for nitrate reduction from aqueous solutions. This study suggests that the reductive denitrification of nitrate by Mg/Cu bimetallic particles was dependent on a number of parameters including reductant dose, solution temperature, initial nitrate concentration and contact time. The 1% Mg/Cu (Cu loading of 1 wt.%) bimetallic particles removed the majority of the various nitrate concentrations tested (50, 100, 150, 200 and 300 mg/L) within a short period. The time required for the removal of 90.6% of the NO 3 -from a 100-mg/L solution was about 20 min using 2 g/L bimetallic Mg/Cu at an initial solution pH of 6. The activation energy (E a ) for the nitrate reduction by 1% Mg/Cu over the temperature range of 5-60°C was 12.77 kJ/mol. The experimental results of the kinetic analysis from batch studies indicated that a higher initial nitrate concentration yielded a greater reaction rate constant and the denitrification rate increased with increasing 1% Mg/Cu dosage. The effects of mixing rate on the denitrification rate suggested that the reaction rate increases linearly at mixing rate \100 rpm and remained almost constant at rates over that.

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Section: Surface Characteristics Of Mg/cu Particlesmentioning

confidence: 78%

Experimental investigation of the chemical reduction of nitrate ion in aqueous solution by Mg/Cu bimetallic particles

Ramavandi

Mortazavi

Moussavi

et al. 2011

Reac Kinet Mech Cat

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“…The Fe 2+ present in the aqueous solution can be oxidized by oxygen into Fe 3+ , which will result in producing corrosion products of different iron (hydr)oxides such as Fe 3 O 4 , Fe 2 O 3 , FeOOH, Fe(OH) 2 , and Fe(OH) 3 , depending on the solution conditions (Triszcz et al 2009;Giasuddin et al 2007;Kanel et al 2005;Huang and Zhang 2005). According to Fig.…”

Section: Effect Of Initial Phmentioning

confidence: 98%

Impact of selected solution factors on arsenate and arsenite removal by nanoiron particles

Tanboonchuy

Hsu

Grisdanurak

et al. 2011

Environ Sci Pollut Res

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“…SW was chosen as a suitable Fe 0 material because of its wide commercial availability at relatively low cost and its high surface area with little resistance to fluid flow [102,118,149]. Due to the high levels of variability of both steel wool (SW) samples and contaminated water sources, only a systematic sequence of experiments can determine whether a SW specimen is suitable for water defluoridation.…”

Section: Steel Wool-based Fe 0 Filters For Water Treatment At the Houmentioning

confidence: 99%

Technologies for Decentralized Fluoride Removal: Testing Metallic Iron-based Filters

Ndé-Tchoupé

Crane

Mwakabona

et al. 2015

Water

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Since the realization in the 1930s that elevated fluoride concentrations in drinking water can have detrimental effects on human health, new methods have been progressively developed in order to reduce fluoride to acceptable levels. In the developing world the necessity for filtration media that are both low-cost and sourced from locally available materials has resulted in the widespread use of bone char. Since the early 1990s metallic iron (Fe 0 ) has received widespread use as both an adsorbent and a reducing agent for the removal of a wide range of contaminant species from water. The ion-selectivity of Fe 0 is dictated by the positively charged surface of iron (hydr)oxides at circumneutral pH. This suggests that Fe 0 could potentially be applied as suitable filter media for the negatively charged fluoride ion. This communication seeks to demonstrate from a theoretical basis and using empirical data from the literature the suitability of Fe 0 filters for fluoride removal. The work concludes that Fe 0 -bearing materials, such as steel wool, hold good promise as low-cost, readily available and highly effective decentralized fluoride treatment materials.

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Effect of operating conditions on iron corrosion rates in zero-valent iron systems for arsenic removal

Cited by 118 publications

References 34 publications

Experimental investigation of the chemical reduction of nitrate ion in aqueous solution by Mg/Cu bimetallic particles

Experimental investigation of the chemical reduction of nitrate ion in aqueous solution by Mg/Cu bimetallic particles

Impact of selected solution factors on arsenate and arsenite removal by nanoiron particles

Technologies for Decentralized Fluoride Removal: Testing Metallic Iron-based Filters

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