Effect of the acid activation on a layered titanosilicate AM-4: The fine-tuning of structural and physicochemical properties

Timofeeva, Maria N.; Kalashnikova, Galina O.; Шефер, К. И.; Mel’gunova, Elena A.; Panchenko, Valentina N.; Николаев, А И; Gil, A.

doi:10.1016/j.clay.2020.105445

Cited by 9 publications

(8 citation statements)

References 43 publications

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“…In the case of titanosilicates used in this work, the key-role is presumably played by extraframework sodium cations, which displacement may significantly affect the change in the surface charge of the samples. The SL3 material in this case is a good example of the formation of an intermediate between the product and the initial AM-4 phase leading to the change in the nature of the active centers of the material (decrease in the acidic strength of the active centers as a result of protonation) [19]. Since SL3 did not prove to be a good sorbent for Pb in our studies, we can assume that titanosilicate samples containing Na + are required to decrease the stability of lead chloride complexes.…”

Section: Discussionmentioning

confidence: 97%

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A Synthetic Analog of the Mineral Ivanyukite: Sorption Behavior to Lead Cations

et al. 2022

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The production of electrolytic nickel includes the stage of leaching of captured firing nickel matte dust. The solutions formed during this process contain considerable amounts of Pb, which is difficult to extraction due to its low concentration upon the high-salt background. The sorption of lead from model solutions with various compositions by synthetic and natural titanosilicate sorbents (synthetic ivanyukite-Na-T (SIV), ivanyukite-Na-T, and AM-4) have been investigated. The maximal sorption capacity of Pb is up to 400 mg/g and was demonstrated by synthetic ivanyukite In solutions with the high content of Cl− (20 g/L), extraction was observed only with a high amount of Na (150 g/L). Molecular mechanisms and kinetics of lead incorporation into ivanyukite were studied by the combination of single-crystal and powder X-ray diffraction, microprobe analysis, and Raman spectroscopy. Incorporation of lead into natural ivanyukite-Na-T with the R3m symmetry by the substitution 2Na+ + 2O2− ↔ Pb2+ + □ + 2OH− leds to its transformation into the cubic P−43m Pb-exchanged form with the empirical formulae Pb1.26[Ti4O2.52(OH)1.48(SiO4)3]·3.32(H2O).

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Section: Discussionmentioning

confidence: 97%

“…AM-4-is a synthetic analog of the mineral lintisite that is used in this work for comparison of its sorption properties with those of SIV was obtained according to the methodology described in detail in [3,18,19].…”

Section: Materials and Their Abbreviationsmentioning

confidence: 99%

A Synthetic Analog of the Mineral Ivanyukite: Sorption Behavior to Lead Cations

et al. 2022

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“…Ion exchangers are of special interest, especially meso- and microporous zircono-, niobo- and titanosilicates, which in many respects are similar to zeolites, but are more stable in aggressive media [ 3 ]. Such materials are already widely used in industry for applications including extracting radionuclides from liquid radioactive waste (LRW) [ 4 , 5 , 6 , 7 , 8 ], gas separation [ 9 , 10 , 11 ], water treatment [ 12 ], as catalysts [ 13 , 14 , 15 ], nanofiber filters, mineral−organic nanocomposites for drug delivery, bio-sensors, optical filters, materials for electronics, mechanics and other purposes [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

“…The acidic form of AM-4 can be used as a renewable sorbent for the Ag and I uptakes, with at least five cycles of transformation without loss of sorption properties [ 49 ]. Acid modification of AM-4 with HNO 3 is used for the reaction of catalysis cyclocondansation between 1,2-phenylenediamine and acetone [ 13 ] and transesterification of glycerol with dimethylcarbonate [ 50 ]. The XRD powder pattern of the acid-modified form significantly differs from the initial AM-4 [ 13 ]; the crystal structure of this phase is unknown.…”

Section: Introductionmentioning

confidence: 99%

The AM-4 Family of Layered Titanosilicates: Single-Crystal-to-Single-Crystal Transformation, Synthesis and Ionic Conductivity

Kalashnikova,

Krivovichev,

Yakovenchuk

et al. 2023

Materials

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Flexible crystal(水晶) structures, which exhibit(展览) single-crystal(水晶)-to-single-crystal(水晶) (SCSC) transformations(转型), are attracting attention(注意) in many applied aspects: magnetic(磁) switches, catalysis, ferroelectrics and sorption. Acid treatment(治疗) for titanosilicate material(材料) AM-4 and natural(自然) compounds with the same structures led to SCSC transformation(转型) by loss(损失) Na+, Li+ and Zn2+ cations with large structural(结构) changes (20% of the unit(单位)-cell(细胞) volume(体积)). The conservation(保育) of crystallinity through complex(复杂) transformation(转型) is possible due(由于) to the formation(形成) of a strong hydrogen bonding(债券) system(系统). The mechanism(机制) of transformation(转型) has been characterized using single-crystal(水晶) X-ray(射线) diffraction analysis(分析), powder(粉) diffraction, Rietvield refinement, Raman spectroscopy and electron microscopy. The low migration(迁移) energy(能源) of cations in the considered materials(材料) is confirmed using bond(债券)-valence and density(密度) functional(功能) theory(理论) calculations, and the ion conductivity of the AM-4 family’s materials(材料) has been experimentally verified.

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“…Natisite also exhibits the ability to store sodium ions, but the diffusion kinetics of sodium ions limits its application as a sodium-ion battery anode [ 16 ]. Natisite could be used as a transition intermediate in synthesizing the layered titanosilicate AM-4 [ 17 ], and it is also the thermal treatment product of sitinakite [ 13 ]. In the extractive metallurgy of titanium, natisite with the morphology of the square sheet was formed as the byproduct of the alkaline roasting and hydrothermal conversion of titanium-containing raw minerals [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Vibrational Spectral Analysis of Natisite (Na2TiSiO5) and its Structure Evolution in Water and Sulfuric Acid Solutions

et al. 2021

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Natisite (Na2TiSiO5) is a layered sodium titanosilicate containing TiO5 square pyramids. The structure evolution of natisite in water and acid solutions is the basis for its potential applications. With Na2SiO3 as the silicon source, natisite with the shape of the square sheet was selectively prepared from the hydrothermal method with 14.3 mol/L NaOH solution at 240 °C. Natisite has 20 Raman active modes and 22 infrared active modes from the first-principles calculations within density functional theory, and the calculated Raman and infrared spectra agree well with the experimental ones. The characteristic Raman peak at 844 cm−1 is caused by the symmetric stretching of the apical Ti–O bond in the TiO5 unit, assigning to A1g and B2g modes. Natisite remains relatively stable in water with a sodium leaching percentage of lower than 6%. When washing with sulfuric acid solutions, the interlayer spacing of natisite is reduced due to the extensive removal of sodium ions, and an intermediate composed of SiO4 and newly formed TiO6 units may be formed. Moreover, after washing with water and acid solutions, 95.5%, 63.4%, and 35.2% of Na, Si, and Ti in natisite can be leached in total, respectively, resulting in the structural disintegration of natisite.

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Effect of the acid activation on a layered titanosilicate AM-4: The fine-tuning of structural and physicochemical properties

Cited by 9 publications

References 43 publications

A Synthetic Analog of the Mineral Ivanyukite: Sorption Behavior to Lead Cations

A Synthetic Analog of the Mineral Ivanyukite: Sorption Behavior to Lead Cations

The AM-4 Family of Layered Titanosilicates: Single-Crystal-to-Single-Crystal Transformation, Synthesis and Ionic Conductivity

Vibrational Spectral Analysis of Natisite (Na2TiSiO5) and its Structure Evolution in Water and Sulfuric Acid Solutions

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