Kinetic evidences of the existence of positively charged species at the quartz-aqueous solution interface

Pokrovsky, Oleg S.; Голубев, С. В.; Mielczarski, J.

doi:10.1016/j.jcis.2005.09.001

Cited by 42 publications

(46 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In all the BET-measurements, care was taken to have sufficient total surface for significant measurements. Pokrovsky et al (2006) have shown that it is actually possible to measure very low surface areas of nearly 1-mm grain size quartz samples.…”

Section: Solid Characterisationmentioning

confidence: 99%

Uranyl Retention on Quartz—New Experimental Data and Blind Prediction Using an Existing Surface Complexation Model

Huber

Lützenkirchen

2009

Aquat Geochem

View full text Add to dashboard Cite

The adsorption behaviour of uranyl onto seven different samples of quartz was studied in batch experiments. Sea-sand (0.1-0.3 mm), Fil-Pro 12/20 (1-2 mm) and five Min-U-Sil samples with smaller particle sizes (5, 10, 15, 30 and 40 lm) were used. The uptake curves show ''pH adsorption edges'' in the range of pH 4-5. A good agreement of the new data with literature data was found when plotting surface-normalised distribution coefficients versus pH. Differences in the adsorption behaviour for pre-treated and untreated sea-sand samples were detectable resulting in a shift of the pH edge to higher pH values after treatment. A literature surface complexation model was applied for blind predictions of the experimental results. The simulations described the experimental observations quite well for the Min-U-Sil samples. For the two coarser quartz samples, the calculated over-predictions were explained by the larger-than-expected measured specific surface area and measurable amounts of associated minerals, for Fil-Pro 12/20 and seasand, respectively. Dissolution of the samples was studied as a function of pH. After 5 days, the measured Si concentrations were all higher than equilibrium quartz solubilities, but lower than those of amorphous silica. With increasing pH, dissolved silica increased. This strongly suggests that formation of dissolved uranyl-silicato complexes have to be considered based on measured silica concentrations.

show abstract

Section: Solid Characterisationmentioning

confidence: 99%

Uranyl Retention on Quartz—New Experimental Data and Blind Prediction Using an Existing Surface Complexation Model

Huber

Lützenkirchen

2009

Aquat Geochem

View full text Add to dashboard Cite

show abstract

“…Assuming the order of the protonation reaction equals to 1 like it is the case for quartz and vitreous silica (Duval et al, 2002;Pokrovsky et al, 2006), Eq. (13) can be used to fit our rate data in the full pH range.…”

Section: Dissolution Kinetics and Behavior Of Phytoliths In Natural Smentioning

confidence: 99%

Surface properties, solubility and dissolution kinetics of bamboo phytoliths

Fraysse

Pokrovsky

Schott

et al. 2006

Geochimica et Cosmochimica Acta

209

152

View full text Add to dashboard Cite

“…[2] for a literature review). Recently, indirect evidence of existence of positive surface charge of SiO 2 at low pH based on kinetics of dissolution was presented [9].…”

Section: Experimental Findingsmentioning

confidence: 99%

pH-dependent surface charging and points of zero charge

Kosmulski

2006

Journal of Colloid and Interface Science

304

134

View full text Add to dashboard Cite

The recently published points of zero charge (PZC) of various materials are compiled to update previous compilations [M. Kosmulski, Chemical Properties of Material Surfaces, Dekker, New York, 2001; M. Kosmulski, J. Colloid Interface Sci. 253 (2002) 77; M. Kosmulski, J. Colloid Interface Sci. 275 (2004) 214]. The recent results corroborate the previously found PZC with a few exceptions. The PZC of alumina obtained from the second-harmonic generation response is substantially lower than the PZC obtained by means of standard methods, while for titania the difference is less significant. PZC of Tl2O3 at pH 7.9 was reported for the first time. A surprisingly insignificant temperature effect on the IEP of rutile was found. Recent model studies aimed at explanation of the effect of the nature of 1-1 electrolytes on the course of charging curves and of discrepancies in the PZC of different materials having the same chemical formula are summarized.

show abstract

Kinetic evidences of the existence of positively charged species at the quartz-aqueous solution interface

Cited by 42 publications

References 31 publications

Uranyl Retention on Quartz—New Experimental Data and Blind Prediction Using an Existing Surface Complexation Model

Uranyl Retention on Quartz—New Experimental Data and Blind Prediction Using an Existing Surface Complexation Model

Surface properties, solubility and dissolution kinetics of bamboo phytoliths

pH-dependent surface charging and points of zero charge

Contact Info

Product

Resources

About