A novel sorbent based on Ti-Ca-Mg phosphates: synthesis, characterization, and sorption properties

Маслова, М. В.; Mudruk, Natalia; Ivanets, A.I.; Шашкова, И. Л.; Китикова, Н. В.

doi:10.1007/s11356-019-06949-3

Cited by 28 publications

(8 citation statements)

References 82 publications

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“…Nevertheless, the zeolite obtained from the Bayer process solutions can compete with other synthetic zeolites in terms of Sr sorption capacity. It is important to emphasize that the capacity of Z4A far exceeds capacity of many novel materials intended for Sr removal: biogenic apatite (47 mg/g 17 ), TiCaMg phosphate (172 mg/g 50 ), zero valent iron nanoparticles–zeolite (nZVI–Z) and nano-Fe/Cu–zeolite (nFe/Cu–Z) (84.12 mg/g and 88.74 mg/g 23 ), MnO 2 -alginate beads (102 mg/g 21 ), and barium-sulfate-impregnated reduced graphene oxide aerogel (232.89 mg/g 51 ).…”

Section: Resultsmentioning

confidence: 99%

Efficient separation of strontium radionuclides from high-salinity wastewater by zeolite 4A synthesized from Bayer process liquids

Smičiklas

Coha

Jović

et al. 2021

Sci Rep

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The efficient, selective, and economical sorbents for the removal of Sr radionuclides are largely needed for the decontamination of effluents with high salinity. In this study, the removal of Sr was investigated using the zeolite produced from the Bayer process liquids. Based on the XRD, SEM/EDS analysis, the product was pure and highly crystalline zeolite 4A (Z4A). Removal of Sr was fast (5 min for 100% removal at 8.80 mg/L), with high maximum sorption capacity (252.5 mg/L), and independent on the initial pH in the range 3.5–9.0. Specific sorption of Sr by protonated groups on the Z4A surface was operating in addition to ion-exchange with Na ions. The selectivity of Z4A decreased in the order Sr > Ca > K > Mg > Na. 84% of Sr was separated from seawater within 5 min, at the Z4A dose of 5 g/L, while efficiency increased to 99% using the dose of 20 g/L. Desorption of radioisotope 89Sr from seawater/Z4A solid residue was very low in deionized water (0.1–0.2%) and groundwater (0.7%) during 60 days of leaching. Z4A is a cost-effective, selective, and high-capacity medium for Sr removal, which provides high stability of retained radionuclides.

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Section: Resultsmentioning

confidence: 99%

Efficient separation of strontium radionuclides from high-salinity wastewater by zeolite 4A synthesized from Bayer process liquids

Smičiklas

Coha

Jović

et al. 2021

Sci Rep

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“…Thus, for a series of sorbents based on PD-2, the reverse dependence of the change in sorption capacity towards Cs + ions is observed in comparison with samples obtained from PD-1. Thus, the obtained data on the increase in sorption capacity with an increase in the content of titanium are due to the formation of a phase of titanium hydrophosphate, which is characterized by a high ion exchange capacity and selectivity towards Cs + ions [26,29,30].…”

Section: Adsorption Behavior Towards Stable Cs(i) Sr(ii) and Co(ii) Ionsmentioning

confidence: 93%

“…The sorption proceeds according to the precipitation mechanism of low soluble phosphates of cobalt and strontium, surface complexation, and the ion-exchange mechanism. It should be noted that the sorption capacity of a composite sorbent is due to the chemical composition of the final solid phase [26]. It is obvious that established differences in sorption mechanism of Cs + , Sr 2+ and Co 2+ ions determine the importance of conducting research on sorption for stable ions and radionuclides for evaluating the effectiveness of various sorbents for real LRW treatment.…”

Section: Introductionmentioning

confidence: 99%

Sorption of stable and radioactive Cs(I), Sr(II), Co(II) ions on Ti–Ca–Mg phosphates

Иванец

Milyutin

Шашкова

et al. 2020

J Radioanal Nucl Chem

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In this paper, we studied the features of stable and radioactive Cs(I), Sr(II) and Co(II) ions sorption on Ti-Ca-Mg phosphates. The significant differences in the sorption of macro quantities of stable Cs + , Sr 2+ and Co 2+ ions and trace concentrations of 137 Cs, 90 Sr and 60 Co radionuclides were found. It has to be taken into account for evaluation the effectiveness of sorbents for the treatment of real liquid radioactive waste. Comparative studies with industrial sorbents have shown that the synthesized in this study mixed Ti-Ca-Mg phosphates are promising materials for one-stage treatment of liquid radioactive waste with complex chemical and radionuclide composition.

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“…Then, the mixture was filtered through a "white tape" paper filter and the specific activity of 137 Cs in the filtrate was determined by the direct radiometric method using the SKS-50M spectrometric complex (Green Star Technologies, Moscow, Russia). Based on analysis results, the distribution coefficient values of the corresponding radionuclide were calculated using equation [24,48]…”

Section: Sorption Of Trace Amounts Of 137 Csmentioning

confidence: 99%

New Sorbents Based on Polyacrylonitrile Fiber and Transition Metal Ferrocyanides for 137Cs Recovery from Various Composition Solutions

Shibetskaia,

Razina,

Bezhin

et al. 2024

Applied Sciences

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For the first time, new sorbents based on polyacrylonitrile (PAN) fiber and transition metal ferrocyanides were obtained. The main difference between the obtained sorbents and the existing ones is the stage of preliminary preparation of the initial support by converting it into the forms PAN-Fe(OH)3 or PAN-MnO2, due to which additional ion exchange groups (carboxyl, carbonyl, etc.) are formed, which increases the amount of ferrocyanide fixed to the support. The best components and conditions for the synthesis of new sorbents were determined (concentration (0.1–0.2 mol/L), as well as pH (1 for sorbents based on PAN-Fe(OH)3, and 1–5—PAN-MnO2) of potassium ferrocyanide solution, concentration of transition metal salts (0.02 mol/L), temperature conditions). The influence of the studied solution composition (pH, concentration of Na+, K+, NH4+ ions) on the cesium distribution coefficients during its recovery by the obtained sorbents was assessed. The possibility of cesium recovery from solutions with pH 1–9 containing macro quantities of cations was demonstrated. The sorbents derived were characterized by modern structural methods such as infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy with EDS analysis. A study of the trace amount sorption of 137Cs was carried out in comparison with commercially available highly efficient sorbents (FNS-10 and Termoksid-35), and it was shown that the resulting sorbents are not inferior to industrial ferrocyanide sorbents and can be used for 137Cs selective sorption from technological solutions and natural waters.

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A novel sorbent based on Ti-Ca-Mg phosphates: synthesis, characterization, and sorption properties

Cited by 28 publications

References 82 publications

Efficient separation of strontium radionuclides from high-salinity wastewater by zeolite 4A synthesized from Bayer process liquids

Efficient separation of strontium radionuclides from high-salinity wastewater by zeolite 4A synthesized from Bayer process liquids

Sorption of stable and radioactive Cs(I), Sr(II), Co(II) ions on Ti–Ca–Mg phosphates

New Sorbents Based on Polyacrylonitrile Fiber and Transition Metal Ferrocyanides for 137Cs Recovery from Various Composition Solutions

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