Sorption of U(VI) and Ra from aqueous solutions with analcime-containing rock

Рачкова, Н. Г.; Шуктомова, И. И.

doi:10.1134/s1066362210010170

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…Анальцим (ANA), как наиболее узкопористый цеолит (D пор = 2,6 Å) по сравнению с другими цеолитами, неспособен при нормальных условиях к сорбции крупных катионов цезия (r = 1.7 Å) [9], но достаточно эффективно осуществляет обмен многозарядных ионов, например, U и Th [10,11]. Анальцим достаточно легко синтезируется в гидротермальных условиях исходя из чистых химических реактивов [12], природных и техногенных алюмосиликатных материалов -цеолитов [13], глин [14] и алюмосиликатных стекол [15][16][17], включая полые алюмосиликатные микросферы из летучих зол (ценосферы) [18].…”

Section: Introductionunclassified

Preparation and Properties of Zr-Bearing Sorption Materials Based on Coal Fly Ash Microspheres

Черных

Fomenko

Vereshchagina

et al. 2019

Journal of Siberian Federal University. Chemistry

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The influence of hydrothermal conditions on synthesis of analcime and a composite material ZrO2- analcime as well as zirconomolybdate coverings with ion exchange properties was studied using narrow fractions of aluminosilicate microspheres with a high content of a glass phase (91-95 wt. %). The possibility to synthesize ZrO2-analcime composites of narrow particle size distributions with maximum of about 40 μm and 6 μm under hydrothermal treatment at 150 °С was demonstrated starting from microspheres with Si/Al=2.7 and applying different regimes of a reaction mixture agitation. A microsphere material of a “core-shell” type such as ZrMo2O7(OH)2(H2O)2@(SiO2-Al2O3)glass with the nanostructured covering was prepared. Sorption properties of the materials regarding Nd3+, Sr2+ and Cs+ were studied under equilibrium conditions by means of determination of sorption isotherms and their fitting by the Langmuir model. Sorption parameters were determined including distribution coefficients which reach the values of 104−105 mL/g

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Section: Introductionunclassified

Preparation and Properties of Zr-Bearing Sorption Materials Based on Coal Fly Ash Microspheres

Черных

Fomenko

Vereshchagina

et al. 2019

Journal of Siberian Federal University. Chemistry

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“…Nonetheless, the mineral phase that dominates the converted material in this study, under optimal conditions, is that of analcime ( Figure 3b ). It is a zeolite that has been reported to have a notable heavy metal adsorption capacity 41 42 and can thus be used for the removal of toxic contaminants from wastewaters, as shown herein.…”

Section: Discussionmentioning

confidence: 92%

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

Georgakopoulos

Chiang

Manović

2017

JoVE

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The aim of this work is to present a zero-waste process for storing CO2 in a stable and benign mineral form while producing zeolitic minerals with sufficient heavy metal adsorption capacity. To this end, blast furnace slag, a residue from iron-making, is utilized as the starting material. Calcium is selectively extracted from the slag by leaching with acetic acid (2 M CH3COOH) as the extraction agent. The filtered leachate is subsequently physico-chemically purified and then carbonated to form precipitated calcium carbonate (PCC) of high purity (<2 wt% non-calcium impurities, according to ICP-MS analysis). Sodium hydroxide is added to neutralize the regenerated acetate. The morphological properties of the resulting calcitic PCC are tuned for its potential application as a filler in papermaking. In parallel, the residual solids from the extraction stage are subjected to hydrothermal conversion in a caustic solution (2 M NaOH) that leads to the predominant formation of a particular zeolitic mineral phase (detected by XRD), namely analcime (NaAlSi2O6∙H2O). Based on its ability to adsorb Ni2+, as reported from batch adsorption experiments and ICP-OES analysis, this product can potentially be used in wastewater treatment or for environmental remediation applications.

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“…At the same time, there hardly is any evidence about purposeful synthesis of sorbents with prescribed pore sizes that would match the size of molecules or ions of uranium compounds being sorbed. However, the number of studies in this area has noticeably increased recently (2007-2010) [18][19][20][21][22].…”

mentioning

confidence: 98%

Sorption of uranium compounds by zirconium-silica nanosorbents

et al. 2012

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Bitemplate (solubilization) synthesis was used to obtain new mesoporous zirconium-silica nanosorbents that can be successfully used to recover uranium compounds from sulfate and carbonate solutions.Studies concerned with sorption methods for recovery of uranium compounds from aqueous solutions, seawater, and wastewater pay primary attention to synthesis of new, or modifi cation of already known, sorbents in order to raise their sorption capacity for uranium, improve their selectivity, and elucidate the sorption mechanism in relation to the pH of the medium and forms in which the sorbate is present in solution.The following sorbents have been used: natural minerals (quartz, muscovite, labradonite [1], pozzolan [2]); zeolites [3], including organozeolites [4] produced by treatment of clinoptilolite-containing tuffs with polyhexamethylene guanidine; sorbents based on wood and lignin [5] with high content of phosphorus; polymers: polymeric chelate sorbents [6]; biopolymer chitosan [7]; Al, Si, Ti oxides, sulfi des, and phosphates, including hydrogels based on the SiO 2 -TiO 2 formulation (in hydrogen form) [8]; crystalline TiO 2 modifi ed with amorphous aqueous SiO 2 [9], titanium phosphates and phosphosilicates [10]; ion-exchange resins: phosphoric acid resins and sulfocation-exchange resins [11]; anionexchange resins: macroporous [12], low-basic [13], high-basic [14], and resins of gel and porous structure [15]; activated carbons: oxidized [16] and modifi ed with arsenazo reagents [17].The wide assortment of sorbents enables their choice for recovery of uranium compounds from aqueous media of various compositions. At the same time, there hardly is any evidence about purposeful synthesis of sorbents with prescribed pore sizes that would match the size of molecules or ions of uranium compounds being sorbed. However, the number of studies in this area has noticeably increased recently (2007)(2008)(2009)(2010) [18][19][20][21][22].The goal of our study was to fi nd whether recovery of uranium(VI) compounds from aqueous solutions by sorption with zirconium-silica nanosorbents is possible and can be effi cient. EXPERIMENTALZirconium-silica nanosorbents were synthesized by bitemplate (solubilization) method from inexpensive reagent: sodium silicate, zirconyl chloride, and industrial fraction of a surfactant [23,24]. Freshly synthesized starting samples were subjected to hydrothermal (980°C) and thermal (600°C) treatments. The specifi c surface of the samples (Table 1) was determined from the argon sorption by the BET method [25] (sample nos. 1-10) and from isotherms of low-temperature sorption-desorption of nitrogen (Fig. 1, sample nos. 1 and 9), measured with Quantachrome NovaWin2 instrument. The pore size distribution was found from the desorption isotherms by using the BJH model.As objects of study served sulfate and carbonate solutions of uranium(VI), which contained 2 × 10 -4 mol (50 mg) of the metal per liter. The concentration of

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Sorption of U(VI) and Ra from aqueous solutions with analcime-containing rock

Cited by 6 publications

References 4 publications

Preparation and Properties of Zr-Bearing Sorption Materials Based on Coal Fly Ash Microspheres

Preparation and Properties of Zr-Bearing Sorption Materials Based on Coal Fly Ash Microspheres

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

Sorption of uranium compounds by zirconium-silica nanosorbents

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