Preparation of silica-based titanate adsorbents and application for strontium removal from radioactive contaminated wastewater

Chen, Z.; Wu, Yan; Wei, Yuezhou; Mimura, Hidenori

doi:10.1007/s10967-015-4470-1

Cited by 25 publications

(6 citation statements)

References 26 publications

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“…The breakthrough curves were fitted to the Thomas model 52 (correlation coefficient R 2 >0.99) with a maximum adsorption capacity of 216.06 mg/g under neutral condition and 50.50 mg/g (Supplementary Table 28 ) under acidic condition (1 mol/L HNO 3 ). Usually, a value of C t / C 0 equal to 0.05 is used as a penetration point in industrial applications, taking into account the volume of wastewater treated 53 . For neutral and 1 mol/L HNO 3 solutions with high concentrations of Cs + (190.13 and 84.25 mg/L, respectively), the treatment volumes to reach the breakthrough points are approximately 1300 and 650 bed volumes, respectively (Fig.…”

Section: Resultsmentioning

confidence: 99%

Highly selective cesium(I) capture under acidic conditions by a layered sulfide

Tang

Jin

et al. 2022

Nat Commun

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Radiocesium remediation is desirable for ecological protection, human health and sustainable development of nuclear energy. Effective capture of Cs+ from acidic solutions is still challenging, mainly due to the low stability of the adsorbing materials and the competitive adsorption of protons. Herein, the rapid and highly selective capture of Cs+ from strongly acidic solutions is achieved by a robust K+-directed layered metal sulfide KInSnS4 (InSnS-1) that exhibits excellent acid and radiation resistance. InSnS-1 possesses high adsorption capacity for Cs+ and can serve as the stationary phase in ion exchange columns to effectively remove Cs+ from neutral and acidic solutions. The adsorption of Cs+ and H3O+ is monitored by single-crystal structure analysis, and thus the underlying mechanism of selective Cs+ capture from acidic solutions is elucidated at the molecular level.

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Section: Resultsmentioning

confidence: 99%

Highly selective cesium(I) capture under acidic conditions by a layered sulfide

Tang

Jin

et al. 2022

Nat Commun

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“…To evaluate the potential use of the composite bead material in practical engineering applications, we measured the breakthrough curves of Sr 2+ and Cs + in an ion exchange column. Usually, a C t / C 0 value equal to 0.05 is used as a penetration point in industrial applications, taking into account the volume of wastewater treated . As shown in Figure c, the breakthrough point of the dynamic adsorption of Sr 2+ was reached after 381 min with a treatment volume of 404.79 bed volumes.…”

Section: Resultsmentioning

confidence: 99%

Calcium-Intercalated Zirconium Phosphate by Granulation: A Strategy for Enhancing Adsorption Selectivity of Strontium and Cesium from Liquid Radioactive Waste

et al. 2023

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The capture of the radionuclides strontium and cesium is of great importance to the environment, human health, and the sustainable development of nuclear energy, and zirconium phosphate with excellent ion exchange capacity has potential application in this field. In this work, we organically granulated zirconium phosphate to induce the formation of composite bead materials (CA@ZrP) with a calcium-containing phase with selectivity for Sr 2+ and Cs + higher than that of pure ZrP in low-pH environments and competing ionic environments. The adsorption performance of the material was systematically investigated. It was concluded that the adsorption performance of CA@ZrP improved with an increase in temperature, and under the dynamic adsorption experimental conditions, the treatment capacity of CA@ZrP for Sr 2+ and Cs + reached 404.79 and 302.2 bed volumes, respectively. The systematic study and characterization showed that the generation of the calcium-containing phase [Ca 0.55 ZrH 0.9 (PO 4 ) 2 ] promoted the exchange of Ca 2+ with Sr 2+ and Cs + , thus improving the selectivity of the composite beads. The highly selective composite bead material can be prepared in batches and easily recycled, providing a new idea for practical engineering applications.

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“…In addition, the large numbers of co-existing Ca 2+ and Na + ions have a great impact on the adsorption of Sr 2+ . The adsorbent can effectively remove Sr 2+ from accident wastewater, but it is not suitable to directly treat radioactive wastewater systems, such as seawater [ 48 ]. The presence of abundant sodium and potassium in seawater decreases the distribution coefficient values, which leads to competition between the various inorganic cations: a higher concentration of ions corresponds to a smaller distribution coefficient [ 106 ].…”

Section: Porous Silica-based Nanoparticles Modified By Inorganic Mmentioning

confidence: 99%

“…The presence of abundant sodium and potassium in seawater decreases the distribution coefficient values, which leads to competition between the various inorganic cations: a higher concentration of ions corresponds to a smaller distribution coefficient [ 106 ]. According to a previous report [ 48 ], the adsorption treatment of Sr 2+ by the K 2 Ti 6 O 13 /SiO 2 adsorbent in simulated Fukushima nuclear accident contaminated wastewater was also carried out. The adsorption capacity at the penetration point of 5% was calculated by changing the flow rate and column diameter of the fluid.…”

Section: Porous Silica-based Nanoparticles Modified By Inorganic Mmentioning

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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Preparation of silica-based titanate adsorbents and application for strontium removal from radioactive contaminated wastewater

Cited by 25 publications

References 26 publications

Highly selective cesium(I) capture under acidic conditions by a layered sulfide

Highly selective cesium(I) capture under acidic conditions by a layered sulfide

Calcium-Intercalated Zirconium Phosphate by Granulation: A Strategy for Enhancing Adsorption Selectivity of Strontium and Cesium from Liquid Radioactive Waste

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

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