Silicate complexes of aluminum(III) in aqueous systems

Swaddle, Thomas W.

doi:10.1016/s0010-8545(01)00362-9

Cited by 176 publications

(156 citation statements)

References 90 publications

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“…Furthermore, no consideration was given to the potential formation of anionic clays containing interstitial carbonate anions, e.g., scarbroite (Al 5 (OH) 13 CO 3 .5H 2 O) (Brindley, 1980) (Hedlund et al, 1987), which could greatly enhance aluminum solubility and enhance aluminum transport, but were not incorporated, because of the substantial differences between the experimental conditions under which these complexes were characterized and those required for the model. Aluminum silicate species have also been identified Salvi et al, 1998;Swaddle, 2001), but were not included, as they are relatively weak, and unlikely to affect the principal findings of the paper.…”

Section: Model Limitationsmentioning

confidence: 99%

Numerical modeling of injection and mineral trapping of CO2 with H2S and SO2 in a sandstone formation

et al. 2007

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Abstract. Carbon dioxide (CO 2 ) injection into deep geologic formations could decrease the atmospheric accumulation of this gas from anthropogenic sources. Furthermore, by co-injecting H 2 S or SO 2 , the products respectively of coal gasification or combustion, with captured CO 2 , problems associated with surface disposal would be mitigated. We developed models that simulate the co-injection of H 2 S or SO 2 with CO 2 into an arkose formation at a depth of about 2 km and 75°C. The hydrogeology and mineralogy of the injected formation are typical of those encountered in Gulf Coast aquifers of the United States. Six numerical simulations of a simplified 1-D radial region surrounding the injection well were performed. The injection of CO 2 alone or co-injection with SO 2 or H 2 S results in a concentrically zoned distribution of secondary minerals surrounding a leached and acidified region adjacent to the injection well. Co-injection of SO 2 with CO 2 results in a larger and more strongly acidified zone, and alteration differs substantially from that caused by the co-injection of H 2 S or injection of CO 2 alone. Precipitation of carbonates occurs within a higher pH (pH > 5) peripheral zone. Significant quantities of CO 2 are sequestered by ankerite, dawsonite, and lesser siderite. The CO 2 mineral-trapping capacity of the formation can attain 40-50 kg/m 3 medium for the selected arkose. In contrast, secondary sulfates precipitate at lower pH (pH < 5) within the acidified zone.Most of the injected SO 2 is transformed and immobilized through alunite precipitation with lesser amounts of anhydrite and minor quantities of pyrite. The dissolved CO 2 increases with time (enhanced solubility trapping). The mineral alteration induced by injection of CO 2 with either SO 2 or H 2 S leads to corresponding changes in porosity. 2Significant increases in porosity occur in the acidified zones where mineral dissolution dominates. With co-injection of SO 2 , the porosity increases from an initial 0.3 to 0.43 after 100 years. However, within the CO 2 mineral-trapping zone, the porosity decreases to about 0.28 for both cases, because of the addition of CO 2 mass as secondary carbonates to the rock matrix. Precipitation of sulfates at the acidification front causes porosity to decrease to 0.23. The limited information currently available on the mineralogy of naturally occurring high-pressure CO 2 reservoirs is generally consistent with our simulations.

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Section: Model Limitationsmentioning

confidence: 99%

Numerical modeling of injection and mineral trapping of CO2 with H2S and SO2 in a sandstone formation

et al. 2007

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“…Aluminum toxicity has become a highly visible topic evolving from studies of acidic soils and aquatic environments. On the alkaline side, there was very little evidence for the existence of Al 3+ species other than the tetrahedral Al(OH) 4 -over the entire accessible pH ranges (Swaddle 2001). As the pH of studied soils ranged between 7.69 to 8.13, the phytotoxiciy symptoms of corn plants did not occur in plants grown in DWTR-treated soils (Table 3).…”

Section: Aluminum Concentration and Uptakementioning

confidence: 94%

Drinking water treatment residuals as an amendment to alkaline soils: Effects on bioaccumulation of heavy metals and aluminum in corn plants

Mahdy¹,

Elkhatib²,

Fathi³

2008

PLANT SOIL ENVIRON

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An alum-based drinking water treatment residue (DWTR) is the by-product from the production of potable water. Land application of DWTR has received a considerable attention for its potential as a low-cost disposal alternative. A greenhouse experiment was conducted to quantify the effects of DWTR on bioaccumulation of some heavy metals in plant tissue and to determine the effects of the DWTR on soil aluminum and aluminum phytotoxicity for the corn plants in alkaline soils. The results indicated that land application of DWTR significantly decreased extractable heavy metals in all studied soils. Combined analyses of all soils and rates of DWTR application showed significant relationship between DTPA-extractable heavy metals and heavy metals uptake of corn plants. Addition of DWTR with different rates (10, 20, 30 and 40 g/kg) to different soil types did not cause aluminum phytotoxicity symptoms for corn plants grown in all studied alkaline agricultural soils because the application rates of DWTR did not increase extractable Al in amended soils > 8 mg Al/kg and the Al phytotoxicity may occur below pH 5.5. Extractable Al is associated with pH of the studied soils, combined analyses of all soils and rates of DWTR application showed a significant relationship between extractable Al and pH. Based on the results of current study, the DWTR is considered an ameliorating material for heavy metals removal from soils; however, additional studies are necessary to confirm these results under field conditions.

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“…In the aqueous solution, hydrolysed silicates may be protonated and the nature may vary from monomers to oligomers [59]. The prevalence of oligomeric silicates result in gels which constitute the building blocks for the geopolymer structure.…”

Section: Reaction Kineticsmentioning

confidence: 99%

Effect of synthesis parameters on the performance of alkali-activated non-conformant EN 450 pulverised fuel ash

Adu-Amankwah

Khatib

Searle

et al. 2016

Construction and Building Materials

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The fly ash reported in this paper is coarser than conventional pulverised fuel ash (PFA), with loss on ignition (LOI) exceeding 10.8%. Consequently, it is precluded from being used as a supplementary cementitious material (SCM) according to EN 450 and disposed in landfills. Alkali-activation of such PFAs is considered here. Three concentrations of sodium hydroxide (NaOH) were separately blended with water glass at different ratios to modify the silica modulus. Heat of reaction, setting time, compressive strength and drying shrinkage were investigated as a function of activator composition. Specimens were either cured at room temperature or hydrothermally treated at 75°C for five hours. The results show that by optimizing the activator composition, a binder with a 28 day compressive strength of 25MPa can be synthesised from such PFAs even at room temperature. Among the activator parameters, the alkali content was observed to be most influential.

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Silicate complexes of aluminum(III) in aqueous systems

Cited by 176 publications

References 90 publications

Numerical modeling of injection and mineral trapping of CO2 with H2S and SO2 in a sandstone formation

Numerical modeling of injection and mineral trapping of CO2 with H2S and SO2 in a sandstone formation

Drinking water treatment residuals as an amendment to alkaline soils: Effects on bioaccumulation of heavy metals and aluminum in corn plants

Effect of synthesis parameters on the performance of alkali-activated non-conformant EN 450 pulverised fuel ash

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