Adsorption characteristics and radiation stability of a silica-based DtBuCH18C6 adsorbent for Sr(II) separation in HNO3 medium

Zi, Chen; Wu, Yan; Wei, Yuezhou

doi:10.1007/s10967-013-2750-1

Cited by 17 publications

(8 citation statements)

References 23 publications

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“…For this purpose, materials having high removal capacity and chemical stability and are easily transformable to the solid monolith directly or by mixing with the least amount of external binders are considered promising materials. Various materials like bioadsorbents, 14,[23][24][25] composites, [26][27][28][29] magnetic materials 30 and inorganic materials 27,31,32 have been used for the removal of Sr(II) from contaminated water. Each of these materials has its own merits and demerits, for instance, bio-sorbents show limited removal efficiency for metal ions at low or trace level concentrations.…”

Section: Introductionmentioning

confidence: 99%

Development of titanium doped hydroxyapatite for efficient removal of radioactive strontium from contaminated water

et al. 2023

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Section: Introductionmentioning

confidence: 99%

Development of titanium doped hydroxyapatite for efficient removal of radioactive strontium from contaminated water

et al. 2023

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“…The water bath is set to 298 K. The speed of the rotary evaporation apparatus is slowly increased to the maximum, and the vacuum pump is opened after rotating the flask for 4 h. The water bath temperature is slowly increased to 315 K to dry the organic solvent; and (3) the large flask containing the drying solvent is placed in a vacuum drying oven, and the drying temperature is set to 315 K. After drying for 24 h, the synthesized adsorbent is bottled and set aside. The above-mentioned steps are based on two previous reports [ 118 , 119 ].…”

Section: Porous Silica-based Nanoparticles Modified By Organic Matmentioning

confidence: 99%

Functionalized Porous Silica-Based Nano/Micro Particles for Environmental Remediation of Hazard Ions

Wang

Jiao

et al. 2019

Nanomaterials

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The adsorption and separation of hazard metal ions, radioactive nuclides, or minor actinides from wastewater and high-level radioactive waste liquids using functional silica-based nano/micro-particles modified with various inorganic materials or organic groups, has attracted significant attention since the discovery of ordered mesoporous silica-based substrates. Focusing on inorganic and organic modified materials, the synthesis methods and sorption performances for specific ions in aqueous solutions are summarized in this review. Three modification methods for silica-based particles, the direct synthesis method, wetness impregnation method, and layer-by-layer (LBL) deposition, are usually adopted to load inorganic material onto silica-based particles, while the wetness impregnation method is currently used for the preparation of functional silica-based particles modified with organic groups. Generally, the specific synthesis method is employed based on the properties of the loading materials and the silicon-based substrate. Adsorption of specific toxic ions onto modified silica-based particles depends on the properties of the loaded material. The silicon matrix only changes the thermodynamic and mechanical properties of the material, such as the abrasive resistance, dispersibility, and radiation resistance. In this paper, inorganic loads, such as metal phosphates, molybdophosphate, titanate-based materials, and hydrotalcite, in addition to organic loads, such as 1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-Calix{4}arene (Calix {4}) arene-R14 and functional 2,6-bis-(5,6-dialkyl-1,2,4-triazin-3-yl)-pyridines(BTP) are reviewed. More specifically, we emphasize on the synthesis methods of such materials, their structures in relation to their capacities, their selectivities for trapping specific ions from either single or multi-component aqueous solutions, and the possible retention mechanisms. Potential candidates for remediation uses are selected based on their sorption capacities and distribution coefficients for target cations and the pH window for an optimum cation capture.

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“…In contrast, organic-inorganic hybrid adsorbent materials prepared by impregnating organic ligands into stabilized carriers combine the excellent properties of organic ligands with the stability of carriers and produce almost no organic waste [11][12][13]. Chen et al [14] prepared a novel silica-based adsorbent by impregnating 4′,4″(5″)-di-tert-butyldicyclohexano-18-crown-6 (DtBuCH18C6) into the interior of the porous carrier (SiO2-P), which had an adsorption capacity of 0.43 mmol/g of Sr in 2 M HNO3 solution. However, the presence of a large number of oxygen atoms in the structure of the crown ether leads to its high hydrophilicity, which makes it prone to leakage when adsorbing Sr (II) [14].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Two Novel Stable Silica-Based Adsorbents for Selective Separation of Sr from Concentrated Nitric Acid Solution

Liu,

Zhang,

Wang

et al. 2024

Metals

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Crown ethers are famous for the highly selectively grab Sr(II) from concentrated nitric acid solution due to the size match, but they suffer from the high leakage into the liquid phase caused by the presence of a large number of hydrophilic groups. To reduce their leakage, two novel porous silica-based adsorbents, (DtBuCH18C6 + Dodec)/SiAaC-g-ABSA and (DtBuCH18C6 + Dodec)/SiAaC-g-3-ABSA, were prepared by vacuum impregnation with organic contents of about 55.9 wt.% and 56.1 wt.%, respectively. The two adsorbents have good reusability and structural stability, and the total organic carbon leakage rates in 2 M HNO3 solution are lower than 0.56 wt.% and 0.29 wt.%, respectively. Batch adsorption experiments revealed that the two adsorbents possessed good adsorption selectivity towards Sr, with SFSr/M over 40, except that of SFSr/Ba in 2 M HNO3 solution. The adsorption equilibrium of Sr in 2 M HNO3 solution was reached within 1 h, with saturated adsorption capacities of 36.9 mg/g and 37.5 mg/g, respectively. Furthermore, the XPS results indicate that the adsorption mechanism is the coordination of the crown ether ring with Sr. This work not only develops two novel adsorbents for the separation of Sr in nitric acid environments; it also provides a method for effectively reducing the water solubility of crown ethers.

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Adsorption characteristics and radiation stability of a silica-based DtBuCH18C6 adsorbent for Sr(II) separation in HNO3 medium

Cited by 17 publications

References 23 publications

Development of titanium doped hydroxyapatite for efficient removal of radioactive strontium from contaminated water

Development of titanium doped hydroxyapatite for efficient removal of radioactive strontium from contaminated water

Functionalized Porous Silica-Based Nano/Micro Particles for Environmental Remediation of Hazard Ions

Preparation of Two Novel Stable Silica-Based Adsorbents for Selective Separation of Sr from Concentrated Nitric Acid Solution

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