Ion-Exchange Investigation of the Nature of Titanium(IV) in Sulfuric Acid and Perchloric Acid

Beukenkamp, John.; Herrington, Kermit D.

doi:10.1021/ja01497a014

Cited by 66 publications

(37 citation statements)

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“…[5] without approximation: From Eqs. [2] and [3], log c a and log c b are given as a function of pH, log c a = −2pH + log c c − log K b K w − log K c K w [9] and log c b = −pH + log c c − log K c K w , [10] where…”

Section: Formation Rate Of Anatase Tio 2 Dependent On Phmentioning

confidence: 99%

“…Ti(IV) ion is known to form complexes with a wide variety of anions and other complexing agents, such as hydroxide (3)(4)(5)(6)(7)(8)(9)(10)(11)(12), fluoride (12)(13)(14)(15)(16), sulfate (3,4,17,18), phosphate (11,19,20), chloride (4,13,21), carbonate (22), hydrogen peroxide (23,24), oxalate (25)(26)(27)(28), citrate (29)(30)(31), lactate (31), tartrate (29,32,33), malate (34,35), ammonia (11,12), amines (36), 8-hydroxyquinoline (9,24,29,37,38), thenoyltrifluoroacetone (9, 10), etc. Relevant textbooks (39), reviews …”

Section: Introductionmentioning

confidence: 99%

“…The constant solubility above pH 4 may suggest the dominance of the neutral complex, Ti(OH) 4 , and it seems evident that the dominant species in HClO 4 solutions in the pH range, at least, from 1 down to 0 is Ti(OH) 2+ 2 (or TiO 2+ ) from the measurements based on cation-exchange methods (3)(4)(5)(6)(7). The pH-dependent solubility of hydrous TiO 2 , nearly proportional to the second power of the acid concentration below pH 2, may support the predominance of Ti(OH) 2+ 2 in this pH range.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of Uniform Anatase TiO2 Nanoparticles by Gel–Sol Method

Sugimoto

Zhou

Muramatsu

2002

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Section: Formation Rate Of Anatase Tio 2 Dependent On Phmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of Uniform Anatase TiO2 Nanoparticles by Gel–Sol Method

Sugimoto

Zhou

Muramatsu

2002

Journal of Colloid and Interface Science

221

160

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“…1). 17,18 Above pH 4, the dominance of the neutral soluble species Ti(OH) 4 is reported. 18 During the hydrothermal step dissolution-reprecipitation mechanisms can be expected to take place with Ostwald ripening processes leading to a decrease in the sample surface area (compare S xer ¼ 270 m 2 g À1 for the un-aged precursor with the average of 220 m 2 g À1 of the present samples, see data in Table 1).…”

mentioning

confidence: 98%

The role of surface electrification on the growth and structural features of titania nanoparticles

Boiadjieva

Cappelletti

Ardizzone

et al. 2004

Phys. Chem. Chem. Phys.

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TiO 2 particles, prepared by following a sol-gel preparative route, were submitted to hydrothermal steps performed at solution pH values corresponding, respectively, to positive, zero and negative oxide surface charges. After the hydrothermal step all the samples were thermally treated at 300 and 600 C, for the same length of time (6 h). The powders, both precursors and calcined samples, were characterized for phase composition-crystallinity, particle morphology and surface electrification features. The role played by the particles electrification during the hydrothermal step in affecting the physico-chemical properties of the powders is discussed.

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“…It is suspected that Fe and Ti species mixed with the uranium precipitate recovered from the filter aid exist as their hydroxides. It has been reported that Ti(IV) is present mainly as TiO 2 + in acidic aqueous chloride solution and present as Ti(OH) 2 2 + or Ti(OH) 3 + in the presence of sulfuric acid at low pH values [27,28]. In addition, it has been reported that Ti(IV) forms fluoro-complexes in the presence of fluorine [29], which are more stable than aluminumfluoro-complexes.…”

mentioning

confidence: 99%

Technique for recovering uranium from sludge-like uranium-bearing wastes using hydrochloric acid

Ohashi

Nomura

Tsunashima

et al. 2013

Journal of Nuclear Science and Technology

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Sludge-like uranium-bearing wastes generated from uranium refining and conversion R&D facilities are stored at the Ningyo-toge Environmental Engineering Center of the Japan Atomic Energy Agency. So far, approximately 1500 t of uranium wastes with radioactivity levels exceeding 10,000 Bq/g have been generated. We have proposed an environmentally benign aqueous process for recovering uranium from wastes using hydrochloric acid (HCl). This makes it possible to dispose of the wastes easily, and to reclaim uranium as a resource. In this process, first, the uranium content in the calcium fluoride (CaF 2 ) sludge along with the entire sludge is dissolved almost completely in aqueous solutions containing HCl and aluminum chloride. The uranium species are then recovered as peroxide from the CaF 2 sludge solution. Their characteristics are similar to those specified for uranium ore concentrate. After recovering the uranium content, the uranium concentration in the solution is reduced to below 0.01 mg/L using an iminodiacetic chelating resin. Also, the uranium concentration of the precipitate generated by the neutralization of the barren solution falls below 1 Bq/g.

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Ion-Exchange Investigation of the Nature of Titanium(IV) in Sulfuric Acid and Perchloric Acid

Cited by 66 publications

References 0 publications

Synthesis of Uniform Anatase TiO2 Nanoparticles by Gel–Sol Method

Synthesis of Uniform Anatase TiO2 Nanoparticles by Gel–Sol Method

The role of surface electrification on the growth and structural features of titania nanoparticles

Technique for recovering uranium from sludge-like uranium-bearing wastes using hydrochloric acid

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