Comparative studies of ferric green rust and ferrihydrite coated sand: Role of synthesis routes

Khare, Varsha; Mullet, Martine; Hanna, Khalil; Blumers, M.; Abdelmoula, Mustapha; Klingelhöfer, G.; Ruby, Christian

doi:10.1016/j.solidstatesciences.2008.01.033

Cited by 11 publications

(13 citation statements)

References 33 publications

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“…In the present analysis, the MIMOS(II) source for the emission of characteristic g-rays was 57 Co which decays to the first excited state of 57 Fe. Details of procedure for MIMOS analysis are detailed in previous work [17].…”

Section: Solid Characterizationmentioning

confidence: 99%

Fenton-like oxidation of Rhodamine B in the presence of two types of iron (II, III) oxide

Xue

Hanna

Deng

2009

Journal of Hazardous Materials

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187

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Section: Solid Characterizationmentioning

confidence: 99%

Fenton-like oxidation of Rhodamine B in the presence of two types of iron (II, III) oxide

Xue

Hanna

Deng

2009

Journal of Hazardous Materials

Self Cite

187

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“…Ultrapure quartz sand (99.8% SiO 2 , Zhensheng Mining Ltd., Shijiazhuang city, China) with sizes ranging from 500 to 600 μm was cleaned thoroughly. To prepare IEA-modified granular media (Fe-sand, Mn-sand, and BC-sand), clean sand was coated with amorphous 2-line ferrihydrite (Fh) and manganese dioxide (MnO 2 ) via wet contact methods 54 or mixed with BC particles (0.2−2 mm) (see Text S1 for detailed protocols).…”

Section: Methodsmentioning

confidence: 99%

Energy Taxis toward Redox-Active Surfaces Decreases the Transport of Electroactive Bacteria in Saturated Porous Media

Liu

Jin

2021

Environ. Sci. Technol.

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The fate and transport of bacteria in porous media are essential for bioremediation and water quality control. However, the influence of biological activities like extracellular electron transfer (EET) and swimming motility toward granular media on cell transport remains unknown. Here, electroactive bacteria with higher Fe(III) reduction abilities were found to demonstrate greater retention in ferrihydrite-coated sand. Increasing the concentrations of the electron donor (1–10 mM lactate), shuttle (0–50 μM anthraquinone-2,6-disulfonate), and acceptor (ferrihydrite, MnO2, or biochar) under flow conditions significantly reduced Shewanella oneidensis MR-1’s mobility through redox-active porous media. The deficiency of EET ability or flagellar motion and inhibition of intracellular proton motive force, all of which are essential for energy taxis, enhanced MR-1’s transport. It was proposed that EET could facilitate MR-1 to sense, tactically move toward, and attach on redox-active media surface, eventually improving its retention. Positive linear correlations were established among parameters describing MR-1’s energy taxis ability (relative taxis index), cell transport behavior (dispersion coefficient and relative change of effluent percentage), and redox activity of media surface (reduction potential or electron-accepting rate), providing novel insights into the critical impacts of bacterial microscale motility on macroscale cell transport through porous media.

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“…The filter material (Fh-Pz) preparation was adapted from that previously reported for Fh-coated sand [21,22]. Three synthesized routes were investigated in order to optimize the amount of Fh coated onto Pz.…”

Section: Filter Materials Preparation and Characterizationmentioning

confidence: 99%

“…The highest iron surface concentrations, i.e. 0.07 wt.% [29] and 0.34 wt.% [21], are obtained for coatings produced through the "reactive" method. For comparison, the iron surface concentration for Fh-coated sand is only 0.09 wt.% with the "dry contact" method [21].…”

Section: Optimization Of the Quantity Of Ferrihydrite Deposited Onto mentioning

confidence: 99%

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Synthesis process and hydrodynamic behavior of a new filtration material for passive wastewater dephosphatation

et al. 2015

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International audienceThe preparation optimization of a filter material intended to be used as a phosphate sorbent in flow-through conditions is investigated. The mixing of ferrihydrite (Fh) and pozzolana (Pz) using a “dry contact method” is found to be the most efficient and leads to the formation of a micrometric thick Fh coating deposited into the honeycombed structure of Pz. The maximal Fh content of ~ 8.5 wt.% is significantly higher than the quantity deposited on other classical substrates such as sand. The phosphate sorption kinetics and isotherms, under dynamic conditions in batch experiments, are best described by pseudo-second-order and Freundlich models respectively. Moreover, under static conditions, sorption kinetics reveals intra-aggregate diffusion process. Phosphate ion retention in packed columns, and especially the breakthrough point, can be adequately predicted when coupling the classical convection dispersion equation and the surface complexation model. Breakthrough curves of phosphate ions are strongly dependent on flow rate; which is important for future industrial applications. Finally, and unexpectedly, a high value of phosphate adsorption capacity (80 mg PO4 g− 1) is observed when phosphate-containing wastewater is used as feed solution. This is mostly explained by soluble calcium ions, which favors the phosphate fixation onto the filter material surfac

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Comparative studies of ferric green rust and ferrihydrite coated sand: Role of synthesis routes

Cited by 11 publications

References 33 publications

Fenton-like oxidation of Rhodamine B in the presence of two types of iron (II, III) oxide

Fenton-like oxidation of Rhodamine B in the presence of two types of iron (II, III) oxide

Energy Taxis toward Redox-Active Surfaces Decreases the Transport of Electroactive Bacteria in Saturated Porous Media

Synthesis process and hydrodynamic behavior of a new filtration material for passive wastewater dephosphatation

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