Synthesis of ethylamine-bridged β-cyclodextrins and adsorption properties of thorium

Hu, Chen; Liu, Huijun; Peng, Long; Sun, Yunkai; Long, Wei

doi:10.1007/s10967-015-4306-z

Cited by 14 publications

(8 citation statements)

References 25 publications

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“…Many techniques have been used for Th separation, including precipitation [ 24 – 26 ], solvent extraction [ 27 , 28 ], and adsorption [ 9 , 21 , 29 – 35 ]. Among these processes, adsorption is arguably the simplest, most adaptable, useful, and well–established technique for Th separation [ 36 ].…”

Section: Introductionmentioning

confidence: 99%

Selective biosorption of thorium (IV) from aqueous solutions by ginkgo leaf

Huang

Chen

et al. 2018

PLoS ONE

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Low–cost biosorbents (ginkgo leaf, osmanthus leaf, banyan leaf, magnolia leaf, holly leaf, walnut shell, and grapefruit peel) were evaluated in the simultaneous removal of La3+, Ce3+, Pr3+, Nd3+, Sm3+, Eu3+, Gd3+, Yb3+, Lu3+, UO22+, Th4+, Y3+, Co2+, Zn2+, Ni2+, and Sr2+ from aqueous solutions. In single metal systems, all adsorbents exhibited good to excellent adsorption capacities toward lanthanides and actinides. In a simulated multicomponent mixed solution study, higher selectivity and efficiency were observed for Th4+ over other metal cations, with ginkgo leaves providing the highest adsorptivity (81.2%) among the seven biosorbents. Through optimization studies, the selectivity of Th4+ biosorption on ginkgo leaf was found to be highly pH–dependent, with optimum Th4+ removal observed at pH 4. Th4+ adsorption was found to proceed rapidly with an equilibrium time of 120 min and conform to pseudo–second–order kinetics. The Langmuir isotherm model best described Th4+ biosorption, with a maximum monolayer adsorption capacity of 103.8 mg g–1. Thermodynamic calculations indicated that Th4+ biosorption was spontaneous and endothermic. Furthermore, the physical and chemical properties of the adsorbent were determined by scanning electron microscopy, Brunauer–Emmett–Teller, X-ray powder diffraction, and Fourier transform infrared analysis. The biosorption of Th from a real sample (monazite mineral) was studied and an efficiency of 90.4% was achieved from nitric acid at pH 4 using ginkgo leaves.

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Section: Introductionmentioning

confidence: 99%

Selective biosorption of thorium (IV) from aqueous solutions by ginkgo leaf

Huang

Chen

et al. 2018

PLoS ONE

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“…Besides, the separation factors (β) of Th(IV)/La(III), Th(IV)/Eu(III), and Th(IV)/Lu(III) could be 10.7, 16.4, and 10.3, respectively. The q e and β values were higher than those of most of the other adsorbents such as functionalized mesoporous silica (19.2 mg/g), fiber-reinforced polymer (24.43 mg/g), impregnating resin XAD-7 (1.7 mg/g), ethylamine-bridged cyclodextrin (10 mg/g), and aluminum ores (0.98 mg/g)…”

Section: Separation Of Th(iv) Ion From a Rare-earth Solutionmentioning

confidence: 85%

Postsynthesis Modification of a Metallosalen-Containing Metal–Organic Framework for Selective Th(IV)/Ln(III) Separation

et al. 2017

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An uncoordinated salen-containing metal-organic framework (MOF) obtained through postsynthesis removal of Mn(III) ions from a metallosalen-containing MOF material has been used for selective separation of Th(IV) ion from Ln(III) ions in methanol solutions for the first time. This material exhibited an adsorption capacity of 46.345 mg of Th/g. The separation factors (β) of Th(IV)/La(III), Th(IV)/Eu(III), and Th(IV)/Lu(III) were 10.7, 16.4, and 10.3, respectively.

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“…[11][12][13][14] Solvent extraction processes were the most interesting technique for separation and recovery of thorium. 15 Various extractants such as amines, [16][17][18] isoxazolones, crown ethers, 19 organophosphorus reagents 20 and ionic liquids 21,22 have been employed for the extraction of thorium and rare earth metals. Extracting a trace amount of thorium spectrophotometry has been introduced as a powerful technique due to its acceptable precision and accuracy, in addition to its lower cost compared to the other techniques.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Analysis of Thorium in Standard Samples and Monazite Sands using Nornicotine Alkaloid

2020

TJNPR

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A rapid, sensitive, and selective method was developed for the quantitative determination of thorium concentration which is an important natural-mineral based on the complex formed with natural phytochemical nornicotine alkaloid at pH 4-6, the coloured complex was extracted in chloroform with a linear relationship in a concentration range from 6-50 µgmL-1 with molar absorptivity 1.8 x 10 4 (1 mol-1 cm-1), Sandell's sensitivity (µgcm-2) 2.3 × 10ˉ2, correlation coefficient 0.9998, limit of detection 0.57 µg ml-1 and limit of quantification 1.88 µg ml-1 at 430 nm. The effects of pH, nornicotine concentration, temperature and time were also studied. The method shows high selectivity for thorium and holds its accuracy and precision well. Therefore, the method is useful when applied to the determination of thorium in synthetic solution and in the monazite sample.

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Synthesis of ethylamine-bridged β-cyclodextrins and adsorption properties of thorium

Cited by 14 publications

References 25 publications

Selective biosorption of thorium (IV) from aqueous solutions by ginkgo leaf

Selective biosorption of thorium (IV) from aqueous solutions by ginkgo leaf

Postsynthesis Modification of a Metallosalen-Containing Metal–Organic Framework for Selective Th(IV)/Ln(III) Separation

Quantitative Analysis of Thorium in Standard Samples and Monazite Sands using Nornicotine Alkaloid

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