Optimization of copper cementation process by iron using central composite design experiments

Djoudi, Warda; Aissani‐Benissad, Farida; Bourouına-Bacha, Saliha

doi:10.1016/j.cej.2007.01.033

Cited by 68 publications

(51 citation statements)

References 11 publications

(17 reference statements)

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“…Other recent studies reported that the presence of the abundant supply of H + ions at highly acidic solution, and the corrosion of Fe affects the deposition of metal on the iron surface. For some subtrates, such as iron (Fe), cementation rate decreases at high solution acidity due to the adsorption of H 2 formed at the metal surface (Equation 3), or the continuous coating of the iron surface with layers of secondary corrosion products (Equation 4) which causes the decrease in the available reduction sites for metal ions present in the solution phase (Djoudi et al, 2007;Komnitsas et al, 2007). This could be the reason why low Pb recovery was obtained at pH less than 1.…”

Section: Removal and Recovery Of Metalsmentioning

confidence: 99%

Recovery of heavy metals from MSW molten fly ash by carrier-in-pulp method: Fe powder as carrier

Alorro

Mitani

Hiroyoshi

et al. 2008

Minerals Engineering

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Municipal solid waste (MSW) molten fly ash is classified as a hazardous waste because it contains considerable amount of heavy metals, which pose environmental concern due to their leaching potential in landfill environments. This study proposes Carrier-in-Pulp (CIP) method as a new hydrometallurgical route to extract and recover Pb, Zn, Cu, and Cd from molten fly ash before landfilling. In this method, a carrier material, which recovers the extracted metals, is added simultaneously with fly ash to a leaching solution and is harvested from the pulp by physical separation method, such as magnetic separation or sieving.To demonstrate the effect of the CIP method, shaking flask experiments were conducted under various conditions using NaCl solution, iron powder as carrier, and molten fly ash. More than 99 wt% Pb, Zn, and Cd, and 97 wt% Cu were extracted from the ash.

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Section: Removal and Recovery Of Metalsmentioning

confidence: 99%

Recovery of heavy metals from MSW molten fly ash by carrier-in-pulp method: Fe powder as carrier

Alorro

Mitani

Hiroyoshi

et al. 2008

Minerals Engineering

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“…Cu 2+ ) by another more electropositive metal (e.g. Fe) whilst the metallic iron is dissolved away (Djoudi et al 2007;Noubactep 2009a, b):…”

Section: Laboratory-synthesized Zvi or Zvi-based Materialsmentioning

confidence: 99%

Hexavalent Chromium Reduction with Zero-Valent Iron (ZVI) in Aquatic Systems

Gheju

2011

Water Air Soil Pollut

315

186

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Hexavalent chromium is a heavy metal used in a variety of industrial applications which is highly toxic to humans, animals, plants and microorganisms. Moreover, it is a well-established human carcinogen by the inhalation route of exposure and a possible human carcinogen by the oral route of exposure. Therefore, it should be removed from contaminated waters. Its reduction to trivalent chromium can be beneficial because a more mobile and more toxic chromium species is converted to a less mobile and less toxic form. During the last two decades, there has been important interest in using zero-valent iron (ZVI) as a Cr(VI)-reducing agent. A considerable volume of research has been carried out in order to investigate the mechanism and kinetics of Cr(VI) reduction with ZVI, as well as the influence of various parameters controlling the reduction efficiency. Therefore, the purpose of this review was to provide updated information regarding the developments and innovative approaches in the use of ZVI for the treatment of Cr(VI)-polluted waters.

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“…CCD are 2k factorial treatment designs with 2k additional treatment combinations called axial points and n 0 replications at the center of design. The property of rotatability developed for CCD requires the variance of estimated values to be constant at points equally distant from the center of design [18]. Thus, our study evaluated the effect of initial concentrations of nitrogen and iron sources on starch accumulation in C. vulgaris using a central composite design (CCD) for two factors.…”

Section: Introductionmentioning

confidence: 99%

Nutrient limitation as a strategy for increasing starch accumulation in microalgae

et al. 2011

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a b s t r a c tIncreasing microalgal starch content by nutrient limitation has been regarded as an affordable approach for the production of third generation bioethanol. This work evaluated starch accumulation in Chlorella vulgaris P12 under different initial concentrations of nitrogen (0-2.2 g urea L À1 ) and iron (0-0.08 g FeNa-EDTA L À1 ) sources, using a central composite design (CCD) for two factors. The obtained model: Starch content (%) = 8.220 À 16.133X 1 + 13.850X 2 1 , relating starch accumulation in microalgae with the coded level for initial urea concentration in the growth medium (X 1 ) presented a good concordance between the predicted and experimental values (R 2 = 0.94). Since accumulation of starch occurred at nitrogen depletion conditions under which the cell growth was much slower than that observed during nitrogen supplemented cultivations, a two-stage cultivation process for high starch accumulation (>40%) and cell growth of C. vulgaris was proposed: a first cultivation stage using nitrogen-and iron-supplemented medium (initial urea and FeNa-EDTA concentrations of 1.1 and 0.08 g L À1 , respectively), followed by a second cultivation stage in a nitrogen-and iron-free medium. The high starch content obtained suggests C. vulgaris P12 as a very promising feedstock for bioethanol production.

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Optimization of copper cementation process by iron using central composite design experiments

Cited by 68 publications

References 11 publications

Recovery of heavy metals from MSW molten fly ash by carrier-in-pulp method: Fe powder as carrier

Recovery of heavy metals from MSW molten fly ash by carrier-in-pulp method: Fe powder as carrier

Hexavalent Chromium Reduction with Zero-Valent Iron (ZVI) in Aquatic Systems

Nutrient limitation as a strategy for increasing starch accumulation in microalgae

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