Rates and nonstoichiometry of vermiculite dissolution at 22°C

Kalinowski, Birgitta E.; Schweda, Peter

doi:10.1016/j.geoderma.2007.08.011

Cited by 34 publications

(30 citation statements)

References 38 publications

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“…As a result, peak at 1.40-1.43 nm may be observed; however, it was shifted to lower values for higher loadings of iron oxide: 1.39 and 1.37 nm for S3 and S4, respectively. Described phenomenon is a result of partial dehydration of the interlayer gallery and formation of so-called HIV-hydroxy-interlayered vermiculites [31,32]. Similar shift was observed also for the sample with the highest nano-hematite content: HS3-1.39 nm.…”

Section: Characterization Of As Received and Spent Catalystssupporting

confidence: 70%

Removal of Phenol from Wastewater Using Fenton-Like Reaction over Iron Oxide–Modified Silicates

Węgrzyn¹

2017

Physico-Chemical Wastewater Treatment and Resource Recovery

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Iron-containing active phase was deposited on natural layered silicate (vermiculite) using several techniques such as ion exchange, precipitation, and forced hydrolysis during hydrothermal digestion. Tuning of the synthesis conditions resulted in preparation of the catalysts with different loading of active phase and physicochemical properties. The composite materials were characterized with respect to their structure (X-ray diffraction), agglomeration state of Fe (diffuse reflectance UV-vis spectroscopy), and chemical composition. Catalytic tests were performed in semi-batch reactor under atmospheric pressure. Aqueous solution of phenol was used as a model industrial effluent, and hydrogen peroxide was added as an oxidant. Spectral techniques were used for identification of intermediate oxidation products. Spent catalysts were also characterized, and structural and chemical changes were determined, e.g., leaching degree of active phase.

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Section: Characterization Of As Received and Spent Catalystssupporting

confidence: 70%

Removal of Phenol from Wastewater Using Fenton-Like Reaction over Iron Oxide–Modified Silicates

Węgrzyn¹

2017

Physico-Chemical Wastewater Treatment and Resource Recovery

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“…Similar changes in pH were observed during vermiculite dissolution with rapid increases in pH initially and slower changes over longer times. This observation suggested that the rate of exchange was diffusion controlled (Kalinowski and Schweda, 2007).…”

Section: Bentonitementioning

confidence: 90%

Atomic-level studies of the depletion in reactive sites during clay mineral dissolution

Sanders

Washton

Mueller

2012

Geochimica et Cosmochimica Acta

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“…Similar patterns have been reported for the dissolution of 2 : 1 phyllosilicates. Kalinowski and Schweda (2007) reported early, rapid release of Mg and K from the interlayer sites of vermiculite by ion exchange and that the rates of these ion exchange reactions were controlled by diffusion. Metz and Ganor (2001) reported early, rapid leaching of Ca, Na, and Mg from the interlayer sites of a smectite sample combined with increased consumption of protons from the solution.…”

Section: Liquid Product Characterizationmentioning

confidence: 99%

Dissolution of Illite in Supercritical CO<sub>2</sub>–Saturated Water: Implications for Clayey Caprock Stability in CO<sub>2</sub> Geological Storage

Sang

Wang

et al. 2018

J. Chem. Eng. Japan / JCEJ

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A series of experimental simulations were conducted to study the e ects of supercritical CO 2 -water on the dissolution of illite under di erent burial depth conditions (1,000, 1,500, and 2,000 m). In addition, the mineral composition, crystalline structure, and uid composition were analyzed. The results indicate that illite dissolution is controlled by solid-liquid diffusion and surface chemical reactions. The elements that undergo metathesis are more easily released than the original xed elements in the crystal lattice, and the interlayer cations are released more easily than octahedral and tetrahedral ions. At deeper burial depths, the percentages of dissolved ions increase. After the reaction, the crystallinity of illite decreases, the proportion of amorphous material increases, and the morphology changes with damage to the lattice. Meanwhile, the dissolution of illite can contribute to the generation of diaspore and siderite.

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Rates and nonstoichiometry of vermiculite dissolution at 22°C

Cited by 34 publications

References 38 publications

Removal of Phenol from Wastewater Using Fenton-Like Reaction over Iron Oxide–Modified Silicates

Removal of Phenol from Wastewater Using Fenton-Like Reaction over Iron Oxide–Modified Silicates

Atomic-level studies of the depletion in reactive sites during clay mineral dissolution

Dissolution of Illite in Supercritical CO<sub>2</sub>–Saturated Water: Implications for Clayey Caprock Stability in CO<sub>2</sub> Geological Storage

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