Sorption of Zirconium from Nitrate and Sulfate Solutions

Локшин, Э. П.; Tareeva, O. A.

doi:10.1134/s0040579519040122

Cited by 4 publications

(7 citation statements)

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“…[38] The exclusive form of zirconium(IV) in solutions above pH > 0 is generally a zirconyl ion (ZrO 2+ ), but the counter ion has remarkable effect on the nature of species containing Zr. Zirconyl nitrate (ZrO(NO 3 )2.5H 2 O), in the solid state, consists of H 2 [ZrO(NO 3 ) 4 ].H 2 O, which dissociates in its aqueous solutions with the formation of ZrO(OH)NO 3 [39] and turns into a non-ionic species. According to this, only 2 mass % of the initial zirconyl nitrate content was adsorbed with sulfonated cationic (Amberlite IR 100) ion exchangers [39].…”

Section: Preparation and Properties Of Zr-loaded Ion-exchangers (2-dv...mentioning

confidence: 99%

“…Zirconyl nitrate (ZrO(NO 3 )2.5H 2 O), in the solid state, consists of H 2 [ZrO(NO 3 ) 4 ].H 2 O, which dissociates in its aqueous solutions with the formation of ZrO(OH)NO 3 [39] and turns into a non-ionic species. According to this, only 2 mass % of the initial zirconyl nitrate content was adsorbed with sulfonated cationic (Amberlite IR 100) ion exchangers [39].…”

Section: Preparation and Properties Of Zr-loaded Ion-exchangers (2-dv...mentioning

confidence: 99%

“…Since the affinity of zirconium to sulfate is higher than to water, this interaction remains stable in aqueous solutions as well. During the electrolysis of aqueous Zr(SO 4 ) 2 solutions, hydrogen evolution was observed on the cathode, and the species in the solution containing Zr was assigned as H 2 [ZrO(SO 4 ) 2 .3H 2 O] [39,40]. This complex contains the zirconium in an anionic species, and it is not supposed to bind onto cation exchangers.…”

Section: Preparation and Properties Of Zr-loaded Ion-exchangers (2-dv...mentioning

confidence: 99%

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Plasma-assisted preparation of nano-(ZrC, ZrO2)@carbon composites from Zr-loaded sulfonated styrene–divinylbenzene copolymers

Martiz

Károly

Trif

et al. 2022

J Therm Anal Calorim

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We have developed a simple method to prepare nano-(ZrC0.93, ZrO2-polymorphs)@carbon composites with graphite/amorphous carbon content and adjustable Zr/C ratio based on using a multistep tube furnace and plasma-assisted heat treatment of zirconium-loaded sulfonated styrene–divinylbenzene (STY-DVB) copolymers. Pre-pyrolysis of zirconium-loaded sulfonated STY-DVB ion exchangers with 2 and 8 mass % DVB at temperatures between 1000 and 1400 °C for 2 h produced nano-ZrO2@C intermediates with particle sizes of ~ 30–60 nm with no ZrC formation. Plasma processing of nano-ZrO2@C resulted in nano-(ZrC0.93, ZrO2)@C composites with 11% (under a He atmosphere) (C/Zr = 73) or 13% (under a H2 atmosphere) (C/Zr = 58) ZrC0.93 content. Three polymorphs of the zirconium dioxide (tetragonal, monoclinic and cubic, between 18 and 27 nm) were found in the products. The amounts of tetragonal and monoclinic ones are comparable to that of ZrC0.93. The average particle size of ZrC0.93 prepared in this way was found to be 21–23 nm. The BET surface area of the nano-(ZrC0.93, ZrO2)@C(graphite) composites prepared in He and H2 was over 250 and 300 m2/g, respectively. We developed a reproducible and easy method to prepare nano-(ZrC, ZrO2)@C products by setting the DVB content, sulfonation degree, Zr loading and the thermal treatment conditions, which have an influence on the ZrC and graphite/amorphous carbon content of nano-ZrO2@C intermediates. The zirconium-loaded sulfonated styrene–divinylbenzene (STY-DVB) copolymers (2 and 8 mass% DVB) or their thermal decomposition was characterized with vibrational spectroscopy, thermal analysis and DSC or powder XRD, BET, XPS and HRTEM methods, respectively.

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Section: Preparation and Properties Of Zr-loaded Ion-exchangers (2-dv...mentioning

confidence: 99%

Section: Preparation and Properties Of Zr-loaded Ion-exchangers (2-dv...mentioning

confidence: 99%

Section: Preparation and Properties Of Zr-loaded Ion-exchangers (2-dv...mentioning

confidence: 99%

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Plasma-assisted preparation of nano-(ZrC, ZrO2)@carbon composites from Zr-loaded sulfonated styrene–divinylbenzene copolymers

Martiz

Károly

Trif

et al. 2022

J Therm Anal Calorim

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“…Highly ordered monocrystalline graphite (ideal graphite lattice) has two first-order Raman bands, G (E 2g , degenerated optical mode at the center of the Brillouin zone) and G1 (2D) (harmonic in-plane transverse optical mode close to the zone boundary K point) at around 1580 cm −1 and 2687 cm −1 , respectively [33,34]. The disordered graphitic lattice has a band D1 (D) (A 1g , phonon of the in-plane longitudinal optical branch close to the zone center) and D2 (D') (E 2g , in-plane acoustic branch close to the K point), or graphene layer edges and surfaces, at around 1350 and 1620 cm −1 , respectively [37,[40][41][42].…”

Section: Tem Analysis Of the L-zr-s-1400-8 And L-zr-n-1000-p-h2 Samplesmentioning

confidence: 99%

“…1200 cm −1 contains mixed modes, including a mode of the disordered graphite lattice (A 1g ), and polyenes or ionic impurities induced modes [27,30,40,41]. Moreover, the Raman spectra of carbonaceous materials contain bands belonging to weak combination (D + D") and harmonic overtone (2D') modes as well [42][43][44].…”

Section: Tem Analysis Of the L-zr-s-1400-8 And L-zr-n-1000-p-h2 Samplesmentioning

confidence: 99%

Nano-ZrO2@C, Nano-(ZrC, ZrO2)@C and Nano-ZrC@C Composites Prepared by Plasma-Assisted Carbonization of Zr-Loaded Iminodiacetate-Functionalized Styrene-Divinylbenzene Copolymers

et al. 2022

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We have developed an easy route to prepare (nano-ZrO2,nano-ZrCx)@C composites with varying ZrO2/ZrCx content. The process consists of preparing a zirconium-loaded, iminodiacetate-functionalized styrene-divinylbenzene (STY-DVB) copolymer, and its subsequent carbonization in a tube furnace and/or a thermal plasma reactor. Depending on the zirconium salt used (zirconyl chloride, zirconyl nitrate or zirconium (IV) sulfate) in the Zr loading, the Zr-loaded resins resulted in ZrO2@C pre-pyrolizates with C to Zr molar ratios of 5.8, 6.8 and 6.60. This carbon surplus is sufficient for the partial or even complete reduction of ZrO2 into ZrC0.58 at 1400 °C. The reaction products also contain 5 to 55 mass% residual free carbon. The plasma processing of the ZrO2@C composite formed at 1000 °C in a tube furnace led to ZrC0.94@C composites. The transformation of amorphous carbon content during the plasma treatment strongly depended on the atmosphere (He or H2) in the reactor and the anion type of the Zr salt. In the presence of He, amorphous carbon could be completely transformed into graphite. In the presence of H2, amorphous carbon and graphite were found at roughly the same ratio. No ZrO2 could be detected in the plasma-treated samples, whilst different ZrO2 polymorphs were found in the samples prepared in the tube furnace, depending on the synthesis conditions.

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A novel method for rapid and highly selective removal of arsenic from copper electrolyte using zirconium salts

Gong,

Cao,

Yan

et al. 2024

Chemical Engineering Journal

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Sorption of Zirconium from Nitrate and Sulfate Solutions

Cited by 4 publications

References 0 publications

Plasma-assisted preparation of nano-(ZrC, ZrO2)@carbon composites from Zr-loaded sulfonated styrene–divinylbenzene copolymers

Plasma-assisted preparation of nano-(ZrC, ZrO2)@carbon composites from Zr-loaded sulfonated styrene–divinylbenzene copolymers

Nano-ZrO2@C, Nano-(ZrC, ZrO2)@C and Nano-ZrC@C Composites Prepared by Plasma-Assisted Carbonization of Zr-Loaded Iminodiacetate-Functionalized Styrene-Divinylbenzene Copolymers

A novel method for rapid and highly selective removal of arsenic from copper electrolyte using zirconium salts

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