Effect of Diluents on the Extraction of Sr<sup>2+</sup>from HNO<sub>3</sub>Solutions with Dicyclohexano‐18‐crown‐6

Gupta, Karan Kumar; Achuthan, P. V.; Ramanujam, A.; Mathur, J. N.

doi:10.1081/sei-120017547

Cited by 26 publications

(12 citation statements)

References 26 publications

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“…On the contrary, the protonation of iPCalixC5X with HNO 3 was dominant under high HNO 3 concentrations. If the composition of the associated species of iPCalixC5 with HNO 3 is assumed to be 1:1 type of the complex, − [HiPCalixC5]NO 3 , the association equation was then proposed as follows: The formation of the associated species [HiPCalixC5]NO 3 may be the main reason why the adsorption of Rb(I) decreased. As a result, the cavity of the host calix[4]arene-crown-5 would be partially blocked by the HNO 3 molecule.…”

Section: Resultsmentioning

confidence: 99%

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Selective Adsorption of Rubidium onto a New 1,3-Alternate Calix[4]crown-5 Mesoporous Adsorbent with a Polar Carrier Containing Polyalkyl Ester

Lyu

Zhang

2019

J. Chem. Eng. Data

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A new mesoporous adsorbent iPCalixC5X containing 1,3-alternate calix[4]crown-5 derivative iPCalixC5 was prepared by vacuum suction. It was immobilized into the pores and channels of XAD-7, a polar carrier containing polyalkyl ester, by introduction and self-assembly. The uptake of Rb, Cs, K, and a total of 20 coexisting metals onto iPCalixC5X was investigated in the range of 0.4–6.0 M HNO3. The separation factor (SF) of Rb with Cs was 186.5 in 1.0 M HNO3 and 95.83 in 3.0 M HNO3. The Rb adsorption capacity was 0.5239 mM/g under the conditions of 298 K, 3.0 M HNO3, and a contact time of 120 min. The removal efficiency was greater than 99.6% for Rb and less than 0.22% for Cs. The Rb adsorption data fitted well with the Langmuir model, reflecting the monolayer adsorption mechanism. The thermodynamic parameters ΔH°, ΔG°, ΔS°, and some fundamental chemical engineering data of Rb adsorption were obtained. Efficient Rb removal from Cs-containing effluents by iPCalixC5X is promising.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Selective Adsorption of Rubidium onto a New 1,3-Alternate Calix[4]crown-5 Mesoporous Adsorbent with a Polar Carrier Containing Polyalkyl Ester

Lyu

Zhang

2019

J. Chem. Eng. Data

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“…Thus, the competitive reactions are formed between the molecular recognition with Sr 2+ and the intermolecular association with HNO 3 , and the results show that the competition leads to an increase in K d values, meaning DT was not protonated extensively at high acidities. The DT and Sr 2+ complex forms Sr(NO 3 ) 2 •DT, 38 which is described in following stoichiometric equation:…”

Section: Methodsmentioning

confidence: 99%

Cesium and Strontium Uptake Utilizing a New Ternary Solid-State Supramolecular Adsorbent under a Framework of Group Partitioning

Zhang

2017

J. Chem. Eng. Data

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To simultaneously remove Sr and Cs from a simulated highly active liquid waste, a new ternary solid-state supramolecular adsorbent BnPC6DTXAD-7 (BnPDTX7), based on organic chelating agents 25,27-bis(1-n-propoxy)-calix[4]26,28-crown-6 (BnPC6), 4,4′(5′)-di-tert-butyldicyclohexano-18-crown-6 (DT), and polymeric carrier XAD-7 was prepared for the first time. Scanning electronic microscopy and Brunauer–Emmett–Teller analysis demonstrated that BnPDTX7 is a macroporous adsorbent. The adsorption of 20 metals onto BnPDTX7 were studied. Under the optimal adsorption conditions of 3.0 M HNO3, 298 K, and contact time of 60 min, the adsorption capacity toward Cs and Sr were 0.1396 mM/g and 0.1289 mM/g, respectively. The experimental data fit well with the Langmuir model, indicative of the monolayer adsorption mechanism. The thermodynamic parameters, ΔH°, ΔG°, and ΔS° of Cs and Sr adsorption and other valuable chemical engineering data were obtained. BnPDTX7 proves to be a promising adsorbent for the simultaneous removal of Sr and Cs because of its high selectivity, fast kinetics, and high stability.

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“…In this case, crown ether compounds and calix-crown compounds for Cs and Sr extraction are promising [11][12][13][14][15]. The normal crown compounds are generally water-miscible; dibenzo-18crown6 and di-t-butyl-dibenzo-18crown6 are available for Cs extraction because of their lipophilicity and dicyclohexyl-18crown6 and di-t-butyl-dicyclohexyl-18crown6 (DtBuDCH18C6) are also useful for Sr extraction [14,15]. In previous studies, chlorinated solvents, namely 1,2-dichloroethane and chloroform, were used generally for the Cs extraction.…”

Section: Introductionmentioning

confidence: 99%

Solvent Extraction of Cesium Using DtBuDB18C6 into Various Organic Solvents

Sasaki

Morita

Kitatsuji

et al. 2021

SERDJ

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High concentration of Cs is present in high-level radioactive waste. It is well-known that Cs is an alkali element and difficult to extract completely into an organic phase. Crown ether compounds are widely available for Cs extractants; DtBuDB18C6 (di-t-butyl-dibenzo-18crown6), was used in this study. Organic solvents used for the industrial applications, such as n-dodecane and 1-octanol, have low solubility concerning the compound; other solvents were employed and tested. In this study, ketone-, ether-, and estertype solvents showed high solubility for DtBuDB18C6 and DtBuDB18C6, when dissolved in ketones and alcohols, exhibited relatively high Cs distribution ratios (D(Cs)), closely to 10.

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Effect of Diluents on the Extraction of Sr²⁺from HNO₃Solutions with Dicyclohexano‐18‐crown‐6

Cited by 26 publications

References 26 publications

Selective Adsorption of Rubidium onto a New 1,3-Alternate Calix[4]crown-5 Mesoporous Adsorbent with a Polar Carrier Containing Polyalkyl Ester

Selective Adsorption of Rubidium onto a New 1,3-Alternate Calix[4]crown-5 Mesoporous Adsorbent with a Polar Carrier Containing Polyalkyl Ester

Cesium and Strontium Uptake Utilizing a New Ternary Solid-State Supramolecular Adsorbent under a Framework of Group Partitioning

Solvent Extraction of Cesium Using DtBuDB18C6 into Various Organic Solvents

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Effect of Diluents on the Extraction of Sr2+from HNO3Solutions with Dicyclohexano‐18‐crown‐6

Cited by 26 publications

References 26 publications

Selective Adsorption of Rubidium onto a New 1,3-Alternate Calix[4]crown-5 Mesoporous Adsorbent with a Polar Carrier Containing Polyalkyl Ester

Selective Adsorption of Rubidium onto a New 1,3-Alternate Calix[4]crown-5 Mesoporous Adsorbent with a Polar Carrier Containing Polyalkyl Ester

Cesium and Strontium Uptake Utilizing a New Ternary Solid-State Supramolecular Adsorbent under a Framework of Group Partitioning

Solvent Extraction of Cesium Using DtBuDB18C6 into Various Organic Solvents

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Product

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Effect of Diluents on the Extraction of Sr²⁺from HNO₃Solutions with Dicyclohexano‐18‐crown‐6