Modeling of the Humidity Effects on the Oxygen Absorption by Iron‐Based Scavengers

Polyakov, V. E.; Miltz, Joseph

doi:10.1111/j.1750-3841.2009.01464.x

Cited by 19 publications

(19 citation statements)

References 45 publications

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“…In a fourth example, Biswas and Bose 121 successfully tested Fe 0 as source of H 2 for autotrophic denitrification. In a fifth example, Fe 0 ‐ and Fe II ‐bearing materials are used as cost‐effective oxygen scavengers to protect oxygen‐sensitive foods from oxidation 122–124. The idea is to eliminate or reduce the levels of oxygen inside packs.…”

Section: Further Applications Of Fe0 In Environmental Remediationmentioning

confidence: 99%

Metallic Iron for Water Treatment: A Critical Review

Noubactep¹

2013

CLEAN Soil Air Water

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Water treatment with metallic iron (Fe0) is still based on the premise that Fe0 is a reducing agent. An alternative concept stipulates that contaminants are removed by adsorption, co‐precipitation, and size‐exclusion in a reactive filtration process. This article underlines the universal validity of the alternative concept. It is shown that admixing non‐expansive material to Fe0 as a pre‐requisite for sustainable Fe0‐based filtration systems. Fe0‐based filters are demonstrated an affordable, appropriate, and efficient decentralized water treatment technology.

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Section: Further Applications Of Fe0 In Environmental Remediationmentioning

confidence: 99%

Metallic Iron for Water Treatment: A Critical Review

Noubactep¹

2013

CLEAN Soil Air Water

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“…where S(a w , T) is the actual degree of saturation of the MC with the electrolyte and a w is the relative humidity. In an earlier publication (Polyakov and Miltz 2010), we have shown that the equilibrium amount of the physisorbed water (EAPW) on the iron deposits obeys the Dubinin-Astakhov equation that can be presented in the following form:…”

Section: Thermal Effects Accompanying the Oxygen Scavenging Processmentioning

confidence: 99%

“…where E= 10.5 kJ/mol is the energy of water adsorption on the FeOOH iron deposits and β= 0.5 is the affinity coefficient (Polyakov and Miltz 2010). For Eq.…”

Section: Thermal Effects Accompanying the Oxygen Scavenging Processmentioning

confidence: 99%

“…The relationship between the integral enthalpy of adsorption,

H_{A}

, and the differential enthalpy of adsorption,

h_{da}

, (associated with an isosteric heat of adsorption) is given by the following integral:

H_{A} = \int_{0}^{S (a_{w}, T)} h_{da} italicdS

where

S ({italica}_{italicw}, T)

is the actual degree of saturation of the MC with the electrolyte and

a_{w}

is the relative humidity. In an earlier publication (Polyakov and Miltz ), we have shown that the equilibrium amount of the physisorbed water (EAPW) on the iron deposits obeys the Dubinin–Astakhov equation that can be presented in the following form:

S (a_{w}, T) = exp (\frac{R T prefixln a_{w}}{β E})

where E = 10.5 kJ/mol is the energy of water adsorption on the FeOOH iron deposits and β= 0.5 is the affinity coefficient (Polyakov and Miltz ). For Eq.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of the Temperature Effect on Oxygen Absorption by Iron‐Based Oxygen Scavengers

Polyakov

Miltz

2015

Journal of Food Science

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A new engineering-oriented model for prediction of the effect of temperature on the kinetics of oxygen absorption by iron-based oxygen scavengers (IOSs) was developed. The model is based on the physicochemical mechanism of the O2 scavenging process by the active component of the IOS (iron powder). The conclusions of this study are: (1) the iron deposits formed on the iron particles are composed of 2 different layers: an inner layer of Fe3 O4 and an outer layer of FeOOH that vanishes with the depletion of oxygen. (2) The model considers the chemical processes in the heterogeneous closed system "Fe-H2 O-NaCl-O2 " and describes the kinetics of oxygen absorption by the powder, depending on the characteristics of the system. (3) The nonlinear ordinary differential equation (ODE) of the O2 absorption kinetics was derived and a simple approximate solution to this ODE was obtained theoretically that is similar to the empirical exponential formula published in the relevant literature. (4) The temperature dependence of the oxygen absorption rate is more complicated than that described by the Arrhenius equation.

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“…Relative humidity, the O 2 concentration and the gas composition inside the package are major factors that influence O 2 absorption kinetics, with an increase in rate of O 2 absorption causing a decrease in porosity and increase in surface area of iron powder corrosive products. Heat from the exothermic reaction of O 2 absorption results in a decrease in the amount of water adsorbed on the corrosion products (Polyakov and Miltz, 2010). An experimental sachet using iron powder and synthetic zeolite in a microperforated film had improved O 2 absorption over commercial sachets at 23°C, but not at 37°C (Braga et al ., 2010).…”

Section: Advances In Active Componentsmentioning

confidence: 99%