Evidence for the Formation of Trioctahedral Clay upon Sorption of Co2+ on Quartz

Manceau, Alain; Schlegel, Michel L.; Nagy, Kathryn L.; Charlet, Laurent

doi:10.1006/jcis.1999.6547

Cited by 85 publications

(68 citation statements)

References 76 publications

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“…In addition, the next-nearest Si shell (Si2 shell) at 4.4 -4.5 Å and higher oxygen shells generate the third peak observed on the RSF of Zn-rich phyllosilicate at R + ∆R ~ 3.5 -4.0 Å (Manceau et al, 1998). This peak is obviously absent in (Zn-Al)-hydrotalcite (Manceau et al, 1999) (Fig. 10b).…”

Section: Zn Species Present In Admixturesmentioning

confidence: 95%

The effect of phytostabilization on Zn speciation in a dredged contaminated sediment using scanning electron microscopy, X-ray fluorescence, EXAFS spectroscopy, and principal components analysis

Panfili

Manceau

Sarret

et al. 2005

Geochimica et Cosmochimica Acta

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122

129

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Running Title: Effect of phytostabilzation on Zn speciation in dredged sediment 2 ABSTRACTThe maintenance of waterways generates large amounts of dredged sediments, which are deposited on adjacent land surfaces. These sediments are often rich in metal contaminants and present a risk to the local environment. Understanding how the metals are immobilized at the molecular level is critical for formulating effective metal containment strategies, such as phytoremediation. In the present work, the mineralogical transformations of Zn Seven Zn species were identified at the micrometer-scale : sphalerite, gahnite, franklinite, Zncontaining ferrihydrite and phosphate, (Zn-Al)-hydrotalcite, and Zn-substituted, kerolite-like, trioctahedral phyllosilicate. Bulk fractions of each species were quantified by LSF of the powder EXAFS spectra to linear combinations of the identified Zn species spectra.In the untreated and unvegetated sediment, Zn was distributed as ~50 % (mole ratio of total Zn) sphalerite, ~40 % Zn-ferrihydrite, and ~10-20 % (Zn-Al)-hydrotalcite plus Znphyllosilicate. In unvegetated but amended sediments (AP and TS), ZnS and Zn-ferrihydrite each decreased by 10 to 20 % and were replaced by Zn-phosphate (~30-40 %). In the presence of plants, ZnS was almost completely dissolved and the released Zn bound to phosphate (~40-60 %) and to Zn phyllosilicate plus (Zn,Al)-hydrotalcite (~20-40 %). Neither the plant species 3 nor the co-addition of mineral amendment affected the Zn speciation in the vegetated sediment.The sediment pore waters were supersaturated with respect to Zn-containing trioctahedral phyllosilicate, near-saturation with respect to Zn-phosphate, and strongly undersaturated with respect to (Zn,Al)-hydrotalcite. Therefore, the formation of (Zn,Al)-hydrotalcite in slightly alkaline conditions ought to result from heterogenous precipitation on mineral surface. 4

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Section: Zn Species Present In Admixturesmentioning

confidence: 95%

The effect of phytostabilization on Zn speciation in a dredged contaminated sediment using scanning electron microscopy, X-ray fluorescence, EXAFS spectroscopy, and principal components analysis

Panfili

Manceau

Sarret

et al. 2005

Geochimica et Cosmochimica Acta

Self Cite

122

129

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“…The high levels of lead and copper in the residual fraction may be due to the presence of acid resistant mineral and organic materials. Furthermore, because of the predominantly sandy nature of the soil, the metals may have co-precipitated with various silicate species consequent to their adsorption into the mineral lattice (Manceau et al, 1996;Manceau et al, 1999). Previous workers (Adano et al, 1995;Chlopecka et al, 1996) have also reported the presence of cadmium, lead and copper in the residual fraction.…”

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confidence: 99%

Screening and speciation of heavy metal contaminated soil from an automobile spare-parts market

Asagba

Okieimen

Osokpor

2007

Chemical Speciation & Bioavailability

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The contributions of automobile spare-parts market activities to heavy metals burden and the forms in which some of these metals exist in the soil environment were assessed. Total values of 150.0 mgykg lead, 98.7 mgykg copper, 5.0 mgykg cadmium, 250.3 mgykg manganese, and 14.0 mgykg nickel were obtained on screening the soil in an automobile spare-parts market. Only lead, cadmium and copper were above threshold values and were consequently speciated. Upon speciating, 6.2% lead, 25.7% copper and 52.0% cadmium were potentially bioavailable.

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“…The Phase 1 effort focused on the laboratory synthesis of clays and clay-like materials from gels at room or ambient temperature, with promising results (Manceau et al, 1999;Zhao et al, 2000, Zhao et al, in press). The Phase 2 effort focused on precipitation of the two most promising clay or clay-like materials identified in Phase 1, mesoporous silica and layered double hydroxide, in natural sediments under laboratory conditions.…”

Section: Discussionmentioning

confidence: 99%

“…Finally, a related study with researchers at the University of Grenoble was conducted to investigate the nucleation of clays on quartz surfaces under ambient conditions. The results of the Phase 1 research are described in three technical papers published in the peer-reviewed scientific literature (Manceau et al, 1999;Zhao et al, 2000, Zhao et al, in press) and are not described further in this report.…”

Section: Overview Of the Research Projectmentioning

confidence: 99%

In Situ Clay Formation: Evaluation of a Proposed New Technology for Stable Containment Barriers

Fredrich¹,

DiGiovanni²,

Nagy³

2004

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Containment of chemical wastes in near-surface and repository environments is accomplished by designing engineered barriers to fluid flow. Containment barrier technologies such as clay liners, soil/bentonite slurry walls, soil/plastic walls, artificially grouted sediments and soils, and colloidal gelling materials are intended to stop fluid transport and prevent plume migration. However, despite their effectiveness in the short-term, all of these barriers exhibit geochemical or geomechanical instability over the long-term resulting in degradation of the barrier and its ability to contain waste. No technologically practical or economically affordable technologies or methods exist at present for accomplishing total remediation, contaminant removal, or destruction-degradation in situ. A new type of containment barrier with a potentially broad range of environmental stability and longevity could result in significant cost-savings. This report documents a research program designed to establish the viability of a proposed new type of containment barrier derived from in situ precipitation of clays in the pore space of contaminated soils or sediments. The concept builds upon technologies that exist for colloidal or gel stabilization. Clays have the advantages of being geologically compatible with the near-surface environment and naturally sorptive for a range of contaminants, and further, the precipitation of clays could result in reduced permeability and hydraulic conductivity, and increased mechanical stability through cementation of soil particles. While limited success was achieved under certain controlled laboratory conditions, the results did not warrant continuation to the field stage for multiple reasons, and the research program was thus concluded with Phase 2. .This page intentionally left blank 5 Preface

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Evidence for the Formation of Trioctahedral Clay upon Sorption of Co2+ on Quartz

Cited by 85 publications

References 76 publications

The effect of phytostabilization on Zn speciation in a dredged contaminated sediment using scanning electron microscopy, X-ray fluorescence, EXAFS spectroscopy, and principal components analysis

The effect of phytostabilization on Zn speciation in a dredged contaminated sediment using scanning electron microscopy, X-ray fluorescence, EXAFS spectroscopy, and principal components analysis

Screening and speciation of heavy metal contaminated soil from an automobile spare-parts market

In Situ Clay Formation: Evaluation of a Proposed New Technology for Stable Containment Barriers

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