SEPARATION AND PURIFICATION TECHNOLOGY
·
2014
·
IF 3.065
Huang Huang,Songdong Ding,Dongping Su,Ning Liu,Jieru Wang,Mengling Tan,Jianen Fei
N , N , N ′, N ′, N ″, N ″-hexaoctylnitrilotriacetamide (NTAamide(C8)) and N,N,N ′ ,N ′ ,N ″ ,N ″-hexabutylnitrilotriacetamide (NTAamide(C4)) were synthesized for selective solvent extraction of Th(IV) from U(VI) and lanthanides(III) (Lns(III)) and for coordination between Th(IV) and NTAamide, respectively. NTAamide(C8) exhibits excellent extraction power and selectivity toward Th(IV) over U(VI) and Lns(III) in a wide range of acidity from 0.1 to 10.0 M HNO 3 . Very high SF Th/M in the range between 2.5 × 10 2 and 10 × 10 3 was observed. Slope analysis shows that Th(IV), U(VI) and Lns(III) were all extracted as mono-solvated species at 3.0 M HNO 3 . The thermodynamic parameters describing the extraction of Th(IV) indicate that the process is endothermic and spontaneous at 298 K. The single-crystal X-ray diffraction observations also establish that 1:1 complex is formed between NTAamide and thorium nitrate, which are in good accordance with the solvent extraction results, and NTAamide is coordinated with Th(IV) in a tetradentate coordination mode.
研究领域:
化学
·
材料科学
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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2017
·Vol. 314
·期 3
·1607-1618
·
IF 1.282
Liu Huijun,Qi Caixia,Feng Zhiyuan,Lei Lanlin,Deng Shanxia
The adsorption of thorium(IV) was studied using a novel supramolecular polyrotaxane based on β-cyclodextrin derivatives. The effects of pH, contact time, Th(IV) initial concentration and adsorbents dosage on the adsorption of thorium(IV) by polyrotaxane were optimized using Box–Behnken design of response surface methodology. Analysis of variance and correlation coefficients showed that the predicted model was consistent with the experimental data well. The adsorption best fitted to the Langmuir model indicated that the adsorption process happened on homogeneous surface. The thermodynamic parameters (∆ G
0 < 0, ∆ H
0 > 0, ∆ S
0 > 0) demonstrated that the adsorption of Th(IV) ions onto polyrotaxane was spontaneous and endothermic.
研究领域:
环境科学
·
化学工程
·
材料科学
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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 326
·期 1
·185-192
·
IF 1.137
Hu Ke,Liu Zhirong,Xiu Taoyuan,Zhou Limin,Wang Yun
The Cu 3 (BTC) 2 (BTC = 1,3,5-benzenetricarboxylic acid) was synthesized by water/solvent heat method. The Cu 3 (BTC) 2 was characterized by SEM/EDS, Zeta potential and XRD. Batch static adsorption experiments investigated the various factors affecting the adsorption of Th(IV) in aqueous solution such as pH, solid–liquid ratio, contact time, initial concentration and temperature, and the adsorption mechanism is also discussed. The adsorption process was in line with the pseudo-second-order kinetic model and the Langmuir isotherm model. At the same time, compared with other adsorbents. The results showed that Cu 3 (BTC) 2 had good adsorption for Th(IV) with a maximum adsorption of 757.58 mg g −1 .
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Songsong Li,Jinglu Han,Yanling Li,Wuping Liao
Enlarging the steric hindrance to the molecular structures of extractants is a common way to improve their selectivity. To improve the separation factor of thorium(IV) and cerium(IV), cyclic groups having large steric hindrance such as phenyl, cyclohexyl, and benzyl were introduced into the α -aminophosphonate extractant molecules. Bis(2-ethylhexyl) ((phenylamino)methyl) phosphonate (PAMP), bis(2-ethylhexyl) ((cyclohexylamino)methyl) phosphonate (CAMP), and bis(2-ethylhexyl) ((benzylamine)methyl) phosphate (BAMP) were synthesized and applied in the separation and recovery of thorium(IV) and cerium(IV) from sulfuric acid solution. The separation ability between cerium(IV) and thorium(IV) descends in the order of CAMP > BAMP ≈ Cextrant230 > DEHAMP >> PAMP, which is consistent with the decreasing order of steric hindrance. Nearly non-extraction of both cerium(IV) and thorium(IV) and the lowest separation ability for PAMP will be due to the conjugation of the lone pair of the amino N atom and benzene ring in PAMP. Furthermore, the extraction of REs(Ⅲ) by CAMP is lower than that of thorium(IV). Thermodynamic parameters ( ΔG 0 , ΔH 0 , ΔS 0 ) and extraction equilibrium constants were determined. An extraction process was developed to separate and retrieve thorium(IV) and cerium(IV) from a bastnaesite leaching solution. The final product purity of CeO 2 and ThO 2 is 99% and 98.4%, respectively, and the yields are 90.2% and 97.6%, respectively.
研究领域:
化学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Ning Pan,Long Li,Jie Ding,Ruibing Wang,Yongdong Jin,Chuanqin Xia
A novel approach for facile covalent functionalization of graphene oxide (GO) was proposed in the present study in order to effectively avoid necessary anhydrous conditions and the usage of harsh reagents during the chemical functionalization of GO. Herein, a GO derivative that was functionalized with a primary amine derivative bearing a positively charged quaternary ammonium group, GO-S, was synthesized through a Schiff base condensation reaction between the amine groups of the primary amine derivative and the aldehyde groups of GO. The introduction of the quaternary ammonium groups can prevent GO from stacking and improve the dispersibility of GO after modification. The formation of imine bonds ( N CH ) between the primary amine and GO has been confirmed by Fourier transform infrared and X-ray photoelectron spectroscopy. The GO-S demonstrated good dispersion stability in aqueous medium and also exhibited better adsorption performance than GO for Th(IV) and U(VI), with a maximum thorium adsorption capacity of 2.22 mmol/g and a maximum uranium adsorption capacity of 0.83 mmol/g, suggesting a great potential for the application of graphene oxide-based materials for facilitating the removal of Th(IV) and U(VI) from nuclear waste solutions.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·Vol. 333
·期 6
·2735-2744
·
IF 1.5
Liu Zengcheng,Xu Yufen
In this paper, a two-step precipitation polymerization method was used to prepare a magnetic poly(cyclotriphosphazene-co-3,3′-sulfonyl dianilide) (MPSD) as an adsorbent for the removal of the radioactive element thorium(IV) in aqueous solution. The magnetic material was characterized and analyzed by FTIR, XRD, SEM, BET and VSM. The experimental results showed that the adsorption capacity of MPSD was 286.7 mg/g when pH was 4.0. And the adsorption process fitted the Langmuir model ( R 2 = 0.9991) and the pseudo-secondary kinetic model ( R 2 = 0.9997). At the same time, the thermodynamic data indicated that the removal of thorium(IV) by MPSD microspheres was a spontaneous endothermic process.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2019
·
IF 2.547
Shilin Jiang,Kui Liu,Yalan Liu,Taiqi Yin,Zhifang Chai,Weiqun Shi
The electrochemical behavior of Th(IV) on a bismuth electrode in LiCl–KCl eutectic was investigated by various electrochemical techniques , aiming at in-depth elucidation of basic electrochemical and thermodynamic properties of Th in molten salt . The results of cyclic voltammetry and coulometric titration indicated that the reduction of Th(IV) on a liquid Bi electrode occurred at −0.92 V (vs. Ag/AgCl) and was a one-step process with four electrons transferred. In addition, thermodynamic properties of Th in liquid Bi medium were evaluated by coulometric titration method in the temperature range from 723 to 798 K. The redox peaks of Bi 2 Th intermetallic compound were detected at −1.13 and −1.05 V, and the corresponding Gibbs free energy of formation was measured by open circuit chronopotentiometry (OCP). Finally, galvanostatic electrolysis (GE) was conducted on a liquid Bi electrode to extract Th from molten salt at 773 K. X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive spectrometry (SEM-EDS) were applied to characterize the composition and morphology of the products, and revealed the formation of Bi 2 Th intermetallic compound.
研究领域:
电化学
·
材料科学
·
核能工程
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Lijun Guo,Liangqiong Peng,Jiheng Li,Wenhua Zhang,Bi Shi
Thorium (Th) and uranium (U) separation remains a huge challenge due to their high similarity in chemical behavior. In this study, lignin-derived magnetic biochar (AL-Fe/BC), which can provide functional sites for adsorbing Th(IV) and U(VI), was synthesized for the selective extraction of Th(IV) from the binary U(VI)-Th(IV) matrix. Characterizations results confirm the successful zero-valent iron loading, and the AL-Fe/BC exhibited a developed polyporous structure, high surface area, stable crystallinity, high defects degree, and advantageous magnetic feature of expedient recovery from water without energy consumption. The optimist AL-Fe/BC-800 showed an outstanding adsorption capacity with a maximal Th(IV) uptake of 2000 mg/g, and a small absorption of 3 mg/g of U(VI) (Th(IV) = 180 mg/L, U(VI) = 20 mg/L, AL-Fe/BC-800 = 0.05 g/L). Moreover, the separation factor of Th(IV) from the Th(IV)-U(VI) matrix reached 90,000 even concomitant with high a concentration of co-existing ions. The active adsorption sites on AL-Fe/BC-800, such as COOH, C-OH, C=O, pyridinic N, graphitic N, and pyrrolic N, exhibited a stronger binding affinity with Th(IV) than U(VI), achieving selective Th(IV) adsorption via a chemisorption process on the basis of competitive adsorption. In summary, AL-Fe/BC-800 is a potential adsorbent in industrial application for the superefficient separation of Th(IV) and U(VI) with high-performance magnetic recovery, promoting the sustainable development of nuclear industry, especially considering the necessary development of Th(IV) fuel.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
IF 4.836
Ning Pan,Long Li,Jie Ding,Shengke Li,Ruibing Wang,Yongdong Jin,Xiangke Wang,Chuanqin Xia
Manganese dioxide decorated graphene oxide (GOM) was prepared via fixation of crystallographic MnO 2 (α, γ) on the surface of graphene oxide (GO) and was explored as an adsorbent material for simultaneous removal of thorium/uranium ions from aqueous solutions. In single component systems (Th(IV) or U(VI)), the α-GOM 2 (the weight ratio of GO/α-MnO 2 of 2) exhibited higher maximum adsorption capacities toward both Th(IV) (497.5 mg/g) and U(VI) (185.2 mg/g) than those of GO. In the binary component system (Th(IV)/U(VI)), the saturated adsorption capacity of Th(IV) (408.8 mg/g)/U(VI) (66.8 mg/g) on α-GOM 2 was also higher than those on GO. Based on the analysis of various data, it was proposed that the adsorption process may involve four types of molecular interactions including coordination, electrostatic interaction, cation-pi interaction, and Lewis acid-base interaction between Th(IV)/U(VI) and α-GOM 2 . Finally, the Th(IV)/U(VI) ions on α-GOM 2 can be separated by a two-stage desorption process with Na 2 CO 3 /EDTA. Those results displayed that the α-GOM 2 may be utilized as an potential adsorbent for removing and separating Th(IV)/U(VI) ions from aqueous solutions.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
PLoS One
·
2018
·Vol. 13
·期 3
·e0193659
·
IF 2.766
Yaoyao Huang,Yang Hu,Lvcun Chen,Tao Yang,Hanfang Huang,Runping Shi,Peng Lu,Chenghua Zhong
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 La 3+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ , Gd 3+ , Yb 3+ , Lu 3+ , UO 2 2+ , Th 4+ , Y 3+ , Co 2+ , Zn 2+ , Ni 2+ , and Sr 2+ 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 Th 4+ over other metal cations, with ginkgo leaves providing the highest adsorptivity (81.2%) among the seven biosorbents. Through optimization studies, the selectivity of Th 4+ biosorption on ginkgo leaf was found to be highly pH–dependent, with optimum Th 4+ removal observed at pH 4. Th 4+ 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 Th 4+ biosorption, with a maximum monolayer adsorption capacity of 103.8 mg g –1 . Thermodynamic calculations indicated that Th 4+ 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.
研究领域:
环境科学
·
放射生物学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2019
·Vol. 322
·期 2
·553-559
·
IF 1.186
Wu Peng,Wang Yun,Li Yang,Hu Xuewen,Xiu Taoyuan,Yuan Dingzhong,Liu Yan,Wu Zhenyu,Liu Zhirong
In order to reduce the potential toxicity to the environment after treatment of radioactive waste water, an eco-friendly graphene oxide nanoribbons/chitosan (GONRs-CTS) composite was prepared and utilized for adsorption of Th(IV) from aqueous solution. The GONRs-CTS adsorbent was characterized by XRD, FTIR and SEM, indicating that GONRs-CTS contains a large amount of oxygen-containing groups and chitosan was successfully attached to the GONRs surface. The Th(IV) adsorption on GONRs-CTS was endothermic and spontaneous, with the maximum single layer adsorption capacity was 140.6 mg g −1 at pH = 3.0, in the contact time of 12 h. The adsorption process was consistent with pseudo-second-order kinetics and the Langmuir isotherm model.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
MICROCHIMICA ACTA
·
2011
·Vol. 173
·期 3
·423-431
·
IF 2.578
Cheng Zhiqiang,Wang Hongqing,Wang Yuyuan,He Fangfang,Zhang Haisheng,Yang Shiqing
A new surface ion-imprinted composite polymer containing 3-methyl-1-phenyl −4-(cis-acylbutenoic acid)-2-pyrazolin-5-one as the functional reagent is presented that is capable of extracting and preconcentrating traces of Th(IV) ion prior to its photometric determination. Parameters affecting the recovery of Th(IV) such as acidity, shaking time, initial concentration of Th(IV), elution condition, sample flow rate, and influence of potentially interfering ions were investigated. The maximum uptake capacity of this material and that of the non-imprinted polymer at pH 4.5 are 56.8 and 26.3 mg g −1 , respectively. Recovery exceeds 95% and is complete within 5 min. A Langmuir isotherm fits the experimental data. The relative selectivity factor for Th(IV)/U(VI), Th(IV)/La(III), and Th(IV)/Ce(III) are 50.8, 78.3, and 82.6, respectively. The relative standard deviation is <2.5%, the detection limit is 0.54 μg L −1 (3σ). The imprinted polymer was coupled to spectrophotometry to separate and determine trace levels of Th(IV) in a soil standard material with satisfactory results.
A new surface imprinted composite polymer containing MPABAP as the functional reagent was synthesized, and a relative standard deviation (R.S.D.) less than 2.5% and a detection limit of 0.54 μg L −1 (3σ) of the present method under the optimized conditions were obtained.
研究领域:
分析化学
·
环境科学
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产品关联
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高影响因子
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