Carbonated ferric green rust as a new material for efficient phosphate removal

Barthélémy, K.; Naille, Sébastien; Despas, Christelle; Ruby, Christian; Mallet, Martine

doi:10.1016/j.jcis.2012.06.038

Cited by 69 publications

(43 citation statements)

References 42 publications

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“…4). In the 'P' and 'P + Zn' adsorption systems, the adsorption capacity of phosphate continuously decreased as solution pH increased, which was well known for the adsorption of anions on (oxyhydr)oxides (Antelo et al, 2010;Barthelemy et al, 2012). Given that the PZC of Fh was about 7.9, increasing pH may either decrease the surface positive charge (at pH < 7.9) or make it more negative (at pH > 7.9), and thus weaken the electrostatic interactions between phosphate and Fh.…”

Section: Effects Of Ph On the Adsorption Of Phosphate And Zn(ii)mentioning

confidence: 82%

Co-adsorption of phosphate and zinc(II) on the surface of ferrihydrite

et al. 2016

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h i g h l i g h t s• Phosphate and Zn(II) exhibited a synergistic adsorption on Ferrihydrite.• The effects of pH on the adsorption of the two contaminants were investigated.• XPS and ATR-FTIR demonstrated ternary complexes were formed on Ferrihydrite.• A phosphate-bridged ternary complexes model was proposed. a r t i c l e i n f o b s t r a c tFerrihydrite (Fh) is of great importance in affecting the migration and transformation of heavy-metal cations and oxyanions. To advance the understanding of co-adsorption reactions on Fh surface, the coadsorption of phosphate and Zn(II) from aqueous solution to a synthesized Fh was determined. The batch experiments demonstrated a synergistic adsorption of phosphate and Zn(II) on Fh. In the pH range of 3.5-6, the adsorption of the two contaminants showed strong pH dependence in the single solute adsorption systems, but the dependence alleviated in the simultaneous adsorption system. X-ray photoelectron spectroscopy (XPS) revealed that the chemical shifts of Zn 2p 1/2 and Zn 2p 3/2 binding energies were more significant than that of P 2p in the single and simultaneous adsorption systems. On the other side, in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) observed increased formation of outer-and inner-sphere complexes of phosphate in the simultaneous system. Thus, the synergistic adsorption of the two contaminants could be attributed to the formation of ternary complexes as well as electrostatic interactions, while surface precipitation could not be completely ruled out. On the basis of the results from both the batch adsorption experiments and structural characterization, these two contaminants were likely to form phosphate-bridged ternary complexes (≡Fe-P-Zn) in the simultaneous adsorption system.

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Section: Effects Of Ph On the Adsorption Of Phosphate And Zn(ii)mentioning

confidence: 82%

Co-adsorption of phosphate and zinc(II) on the surface of ferrihydrite

et al. 2016

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“…This layer of water molecules is clamped between two catalytic surfaces that, while highly viscous, could permit the persorption of larger anions such as the di-anion carbonate to replace the chloride or hydroxide ions in a compartment that still would be less than a nanometre wide. At relatively low pH, orthophosphate might be accommodated together with phosphate-charged reactants between these flexible nanometric membranes [100,[158][159][160]. These tiny channels have the potential to provide primitive enzymatic functions.…”

Section: A Pyrophosphatase Engine: Chemiosmosis For Freementioning

confidence: 99%

“…As previously mentioned, green rust of the kind to be precipitated at the interface between the alkaline hydrothermal solution and acidulous phosphate and iron-bearing ocean water is likely to comprise [Fe 8 ) with the obligate intercalation of anions to maintain charge balance [160][161][162][163][164][165]. Such a nanocryst may have acted as the pseudo enzyme driving phosphate condensation in lieu of the membrane helices [100,165,167 -169].…”

Section: A Pyrophosphatase Engine: Chemiosmosis For Freementioning

confidence: 99%

The inevitable journey to being

Russell

Nitschke²,

Branscomb

2013

Phil. Trans. R. Soc. B

121

159

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Life is evolutionarily the most complex of the emergent symmetry-breaking, macroscopically organized dynamic structures in the Universe. Members of this cascading series of disequilibria-converting systems, or engines in Cottrell's terminology, become ever more complicated—more chemical and less physical—as each engine extracts, exploits and generates ever lower grades of energy and resources in the service of entropy generation. Each one of these engines emerges spontaneously from order created by a particular mother engine or engines, as the disequilibrated potential daughter is driven beyond a critical point. Exothermic serpentinization of ocean crust is life's mother engine. It drives alkaline hydrothermal convection and thereby the spontaneous production of precipitated submarine hydrothermal mounds. Here, the two chemical disequilibria directly causative in the emergence of life spontaneously arose across the mineral precipitate membranes separating the acidulous, nitrate-bearing CO 2 -rich, Hadean sea from the alkaline and CH 4 /H 2 -rich serpentinization-generated effluents. Essential redox gradients—involving hydrothermal CH 4 and H 2 as electron donors, CO 2 and nitrate, nitrite, and ferric iron from the ambient ocean as acceptors—were imposed which functioned as the original ‘carbon-fixing engine’. At the same time, a post-critical-point (milli)voltage pH potential (proton concentration gradient) drove the condensation of orthophosphate to produce a high energy currency: ‘the pyrophosphatase engine’.

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“…8. The peak at 11.4 • is assigned to the (0 0 3) plane of green rust [42] that comes from the products of both dissolved Fe(II) and Fe (hydr)oxides such as lepidocrocite, goethite and ferrihydrite, and it can be further transformed into lepidocrocite by air oxidation [43,44]. High pH is more suitable for the formation of green rust which makes it more significant in XRD patterns at pH 8.0 than those at pH 6.0 and 7.0 [19].…”

Section: Characterization Of Fe (Hydr)oxides Formed At Ph 80mentioning

confidence: 99%