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Локшин, Э. П.; Иваненко, В. И.; Avsaragov, Kh.-M. B.; Mel'nik, N. A.; Vladimirova, V. V.; Калинников, В. Т.

doi:10.1023/a:1015822621857

Cited by 6 publications

(3 citation statements)

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“…• Sorbents based on transition metal ferrocyanides (Anfezh, Niket, Uniket, FSS, FD-M, FIC, Termoxid 35, NKF-C) [22,36]: • Sorbents based on zirconium phosphate (Termoxid 3A) [22,37]:…”

Section: Evaluation Of the Sorption Efficiency Of 137 Cs By Various S...mentioning

confidence: 99%

Estimation of 137Cs Distribution and Recovery Using Various Types of Sorbents in the Black Sea Surface Layer

et al. 2023

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Monitoring 137Cs in seawater is necessary for the timely detection of radioactive contamination. The possibility of sorption and the sorption efficiency of 137Cs from seawater were studied for the first time during several cruises of the R/V (research vessel) Professor Vodyanitsky using various types of sorbents based on transition metal ferrocyanides (Anfezh, Niket, Uniket, FSS, FD-M, FIC, Termoxid 35, NKF-C) and zirconium phosphate (Termoxid 3A). The influence of the seawater flow rate and volume of the sorbent used for the recovery of 137Cs was estimated. The ferrocyanide sorbents Niket, Uniket, Termoxid 35, and FIC showed the best sorption efficiency (60–100%) at a seawater flow rate of 2–4 column volumes per minute. The data obtained during three cruises on the R/V Professor Vodyanitsky were analyzed. A detailed (28 sampling points) spatial distribution of 137Cs in the Black Sea along the southern coast of Crimea was studied using the sorbents that showed the best characteristics. An increase in 137Cs activity in the study area was not found, and the average activity was 9.01 ± 0.87 Bq/m3.

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“…• Sorbents based on transition metal ferrocyanides (Anfezh, Niket, Uniket, FSS, FD-M, FIC, Termoxid 35, NKF-C) [22,36]: • Sorbents based on zirconium phosphate (Termoxid 3A) [22,37]:…”

Section: Evaluation Of the Sorption Efficiency Of 137 Cs By Various S...mentioning

confidence: 99%

Estimation of 137Cs Distribution and Recovery Using Various Types of Sorbents in the Black Sea Surface Layer

et al. 2023

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“…2 2016 The use of inorganic sorbents based on hydrated titanium hydrophosphates with the molar ratio P : Ti(IV) ≤ 1 may be an efficient solution of the problem. Sorbents of the composition TiO 1+x (ОН) 2(1-x-y) (HPO 4 ) y · nH 2 O are capable of efficiently taking up radionuclides from multicomponent highly saline solutions [8,[11][12][13][14][15]. Their modification with transition metal cations enhances the cation-exchange properties and ensures the sorption of 137 Cs, 134 Cs, 90 Sr, 60 Co, and other radionuclides from multicomponent process solutions against the background of high concentrations of nonradioactive elements in more acidic media [16][17][18].…”

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Immobilization of metal cations with titanium phosphate sorbents

2016

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Dehydration and crystallization of titanium phosphate sorbents saturated with metal cations were studied with the aim of developing methods for immobilization and reliable disposal of radionuclides. The heat treatment of spent titanium phosphate sorbent with the molar ratio P : Ti(IV) ≤ 1 results in the formation of stable poorly soluble mineral-like crystalline matrices of framework structure with a low-mobility cationic sublattice. Immobilization of radionuclides directly in the spent titanium phosphate sorbent upon its conversion into the crystalline state in the form of a stable ceramic matrix allows minimization of the volume of waste to be disposed of and enhancement of the reliability of their long-term storage.

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“…As pH of solutions was not determined and adjusted when determining K d , the increase in the solution acidity resulted in the K d reduction. This can be overcome by maintaining the optimal pH value [15,16]. Second, when the size of sorbent particles increases, diffusion limitations arise.…”

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Preparation of Titanium Phosphate Sorbents from Products of Processing Sphene Concentrate and Properties of These Sorbents

et al. 2005

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Procedures for the preparation and granulation of sorbents based on TiO(HPO 4 ) . nH 2 O from the products of processing of sphene concentrate were developed. The sorption and hydrodynamic characteristics of the sorbents were determined. Titanium(IV) phosphates are of a great interest as sorption materials. Depending on synthesis conditions they can have the composition TiO(OH) 2x (HPO 4 ) 1 !x . nH 2 O, TiO(HPO 4 ) . nH 2 O, or Ti(HPO 4 ) 2 . nH 2 O, with TiO(HPO 4 ) . nH 2 O being prepared more easily. Hydrated oxotitanium hydrophosphate can be produced both as a fine amorphous powder and as a granulated product. It was shown in numerous studies that this sorbent efficiently absorbs cations of radionuclides [138] and also of nonferrous metals and iron [9314] from very dilute aqueous solutions. This sorbent can be used for efficient decontamination of liquid radioactive wastes, which are aqueous solutions with a high content (the studies covered concentrations of up to 32 g l !1 ) of salts present in seawater [15317]. Known procedures for preparing granulated sorbents are complicated and expensive [7, 18]. The developed technology of processing sphene concentrate for the synthesis of titanium phosphate sorbent (see scheme) can use titanium sulfate process solutions containing, g l !1 : TiO 2 160 3340, H 2 SO 4 280 3570, CaO 1.6 35.6, F 4.4 37.7, Fe 2 O 3 1.737.4, SiO 2 <0.05, and TR 2 O 3 <0.20 (solution after sulfatization in the scheme); titanium3silica product (TSP) containing, wt %: TiO 2 48, SiO 2 37, CaO 0.56 33.00, Ln 2 O 3 <0.018, Fe 2 O 3 <0.64, Al 2 O 3 <0.25, F <2.2, and NO 3 ! 3.60; and hydrolytic sulfuric acid containing, g l !1 : TiO 2 12313.5, Fe 2 O 3 up to 7.4, and F 4.4 37.7.In this work we studied the conditions of the synthesis of powdery titanium-phosphate sorbents based on TiO(HPO 4 ) . nH 2 O from titanium-containing products obtained in processing of sphene concentrate using simple granulation procedures, and also the sorption and hydrodynamic characteristics of these sorbents.EXPERIMENTAL Titanium(IV) was precipitated from titanium sulfate process solutions by a stoichiometric amount of orthophosphoric acid according to the reaction TiOSO 4 + H 3 PO 4 + nH 2 O = TiO(H 2 PO 4 )(HSO 4 ) . nH 2 O.(1)The further washing with water yields the desired product:TiO(H 2 PO 4 )(HSO 4 ) . nH 2 O = TiO(HPO 4 ) . nH 2 O + H 2 SO 4 .(2)The product (sorbent 1) contains 453 46.7 wt % water, which corresponds to n = 6.60 + 0.25. A comparison with sorbents synthesized from Ti(IV) sulfate solutions in the absence of fluoride ions shows that their presence in the titanium sulfate solution had no effect on the composition and properties of the product, because fluoride ions remained in the highly acidic mother liquor.

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Cited by 6 publications

References 1 publication

Estimation of 137Cs Distribution and Recovery Using Various Types of Sorbents in the Black Sea Surface Layer

Estimation of 137Cs Distribution and Recovery Using Various Types of Sorbents in the Black Sea Surface Layer

Immobilization of metal cations with titanium phosphate sorbents

Preparation of Titanium Phosphate Sorbents from Products of Processing Sphene Concentrate and Properties of These Sorbents

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