RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 4
·2889-2911
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IF 1.674
Qi Caixia,Liu Huijun,Deng Shanxia,Yang AoHui,Li Zhendong
The inclusion complex (sulfated-β-CD@NAA) of sulfated β-cyclodextrin and α-naphthylacetic acid was synthesized for adsorption of low concentrations of thorium from aqueous solutions. The structure and property of sulfated-β-CD@NAA were characterized by Fourier transform infrared spectroscopy, thermogravimetric, X-ray diffraction, proton nuclear magnetic resonance, specific surface area measurement and scanning electron microscopy. The characterization analysis confirmed the formation of new solid phase. The results indicated that α-naphthylacetic acid embedded into the cavity of sulfated β-cyclodextrin partly from the secondary face and the thermal stability of inclusion complex was significantly increased. The experiments were designed by Box–Behnken design combined with response surface methodology. The adsorption parameters of pH value, contact time, initial concentration were used as the independent variables and their effects were investigated on the Th(IV) adsorption capacity. Second-order polynomial regression models were derived and analysis of variance was utilized to judge the adequacy of the chosen models. The maximum Th(IV) adsorption capacity (12.75 mg g −1 ) was achieved under the following conditions: pH value 2.5, contact time 35 min, initial concentration 30 mg L −1 . Prediction of models was in good agreement with experimental results. The experimental adsorption kinetic data followed a pseudo-second-order equation with the correlation of 0.9996, indicating the chemical adsorption. The obtained equilibrium isotherm data were fitted well with Langmuir model in the concentration range considered. The thermodynamic parameters ( ∆H 0 < 0, ∆S 0 < 0, ∆G 0 < 0) indicated that the adsorption process was exothermic and spontaneous. Regeneration of Th(IV)-loaded sulfated-β-CD@NAA with 0.1 M HNO 3 solution, and the regenerated sulfated-β-CD@NAA can be reused for adsorption of Th(IV).
研究领域:
环境科学
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化学工程
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xiaofan Ding,Long Chen,Yaolin Zhao,Jing Zhao,Songtao Xiao
The capture and separation of uranium and thorium from acidic nuclear waste streams are imperative for safeguarding the environment and human well-being. Metal-organic frameworks (MOFs), an emerging class of porous materials, offer considerable potential for U(VI)/Th(IV) adsorption owing to their customizable pore size and processability. Nonetheless, the development of MOFs with robust adsorption capabilities for U(VI)/Th(IV) in acidic conditions poses a significant challenge. In this study, we introduce a feasible MOF design approach: the integration of high-valent metal centers with oxygen-rich organic ligands. Employing this strategy, we have successfully engineered a novel MOF adsorbent, SU-102(Hf), comprising hafnium-based metal clusters and ellagic acid as the organic linker. In a 0.3 M nitric acid environment, SU-102(Hf) demonstrates outstanding chemical stability and exhibits a high adsorption capacity for both uranium (27.38 mg g −1 ) and thorium ions (32.03 mg g −1 ), which represent a record of simultaneous adsorption capacity of uranium and thorium binary components by MOFs in a highly acidic environment (0.3 M HNO 3 ). Simultaneously, SU-102(Hf) also displays rapid adsorption kinetics, excellent selectivity, and recyclability for U(VI)/Th(IV) separation at pH = 3. Experimental investigations and theoretical calculations further unravel the adsorption mechanisms and key differences for Th(IV) and U(VI) ions.
研究领域:
环境化学
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放射化学
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材料科学
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分离科学
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核能工程
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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 3
·607-616
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IF 1.6
Zhou Zhulin,Fu Yongmei,Wang Xiaoqin,Si Xuting,Lu Youcai
Rare earth (RE) elements is usually associated with radioactive thorium (Th) in nature. Here, we develop a new solid-phase extraction system for the separation of Th, and the effects of acidity, equilibrium time and cycle times on the adsorption performance of the resin were investigated. Kinetic studies show the extraction system has excellent chemical stability and cyclic stability. Further study the application of the resin in industry demonstrated that the separation efficiency is still up to 88%. Therefore, this work not only provides a new strategy for solid-phase extraction system, but also opens up a new way for Th separation.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2022
·Vol. 20
·期 2
·1194-1204
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IF 2.328
Song Qi,Fang Guan,Dan Peng,Xuyi Zhang,Wuping Liao
A simple and effective method for preparing ThO 2 ceramics with high density has been proposed. It mainly includes a positive precipitation approach and a conventional sintering process. The SEM images and laser particle size analysis show that the prepared powder exhibits a round-plated shape with a uniform and narrow particle size distribution, which is the key to the densification sintering of ThO 2 ceramics. The XRD analyses confirm that the ThO 2 ceramics sintered at 1590°C were composed of cubic fluorite phase. The effect of sintering temperature on the density of ThO 2 ceramics was also investigated, and a relative density higher than 95% were achieved after sintering at 1590°C for 6 h in an air atmosphere. Moreover, the Vickers hardness was up to 8.49 GPa, the average linear expansion coefficient within 40–800°C was low to 10.97 × 10 −6 /K, and the thermal conductivity and the thermal diffusivity were both higher than most of traditional ceramic materials (16.94–5.86 W/m K and 7.28–1.28 mm 2 /s, respectively, within the temperature range of 25–800°C). The previous great performances are closely related to its high density, which enables it to be a great candidate for nuclear fuels and other potential application fields.
研究领域:
材料科学
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核材料
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陶瓷学
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无机非金属材料
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固态化学
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DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Daqian Liu,Zuohai Liu,Min Huang,Taoyuan Xiu,Yun Wang,Zhirong Liu
A novel type of modified pyrolytic carbon (TOPO@PyC) was successfully prepared through incorporating tri-n-octyl phosphine oxide (TOPO). The adsorption behavior of TOPO@PyC for Th (IV) under strongly acidic conditions was investigated. The TOPO@PyC exhibited rapid Th(IV) adsorption rate with equilibrium time of 40 min. In 0.1–8 mol/l HNO 3 , the Th(IV) adsorption capacity reached between 43 and 50 mg/g. The adsorption kinetics and adsorption process of TOPO@PyC for Th(IV) can be well explained through the pseudo-second-order kinetic and Langmuir isothermal adsorption model. The temperature exhibited only a minor influence on Th(IV) adsorption capacity. The microstructure and adsorption mechanism of TOPO@PyC was characterized and elucidated through various techniques including SEM-EDS, BET, TGA, FT-IR, XPS and DFT calculations. By coordinating with O atom on TOPO, Th(IV) was successfully complexed on TOPO@PyC in a ratio of 1:3. Furthermore, TOPO@PyC manifested good thermal stability and acid resistance. After five times, the Th(IV) adsorption and desorption efficiency of TOPO@PyC still exceeded 95 %. Additionally, TOPO@PyC exhibited stronger selectivity towards Th(IV) from mixed solutions. Remarkably, it recovered over 90 % of thorium and uranium from the leachate of tantalum slag. Consequently, TOPO@PyC holds considerable promise in the treatment of strongly acidic wastewater containing thorium and uranium.
研究领域:
环境科学
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材料科学
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核化学
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吸附技术
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产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·
IF 1.5
He Xuexiang,Liao Linyuan,Tang Jing,Chen Lifeng,Lv Lidan,He Dongqiao,Yin Xiangbiao,Li Wenlong,Ning Shunyan,Wei Yuezhou
A silica-supported copolymer loaded with bis (2-ethylhexyl) phosphate was prepared and first investigated for the separation of trace radium from natural 232 Th. Results showed that the adsorbent was prepared successfully with ultrahigh selectivity and ultrafast adsorption kinetics towards thorium, making the separation easy and convenient. The chemical recovery rate to radium reached 96.7%, and the decontamination factor to thorium exceeded 10 5 . Generally, this work demonstrated the feasibility of using this material and method to directly separate 228 Ra and 224 Ra from 232 Th, rendering it significant in the future preparation and application of 212 Pb.
研究领域:
材料科学
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核化学
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Duo Jiang,Li Liu,Ning Pan,Fuqiang Yang,Shengke Li,Ruibing Wang,Ian W. Wyman,Yongdong Jin,Chuanqin Xia
The separation of Th(IV)/U(VI) is of great importance in the development of thorium-based reactors. Here, we report our studies of Th(IV)/U(VI) separation by graphene oxide (GO). Firstly, variation of media conditions such as the pH, contact time, ionic strength, as well as the presence of different anionic ligands were conducted. The results showed that GO exhibited great selectivity for Th(IV) and the separation factor of Th(IV)/U(VI) reached as high as 36.3 after 2 h of contact at pH 3.8 and minimum ionic strength, and increasing the ionic strength caused the separation factor of Th(IV)/U(VI) to decrease. The presence of sulfate strongly influenced the separation factor of Th(IV)/U(VI) by GO. Secondly, competitive adsorption studies, as well as SEM–EDS, XRD, FT-IR, and XPS characterization were employed to gain further understanding of the mechanism of GO’s selective complexation of Th(IV)/U(VI). FT-IR and XPS characterizations showed that GO adsorbed Th(IV)/U(VI) through coordination of functional groups such as C O and C O on GO. The results of the competitive adsorption studies suggested that GO had a selective affinity for Th(IV) over U(VI). SEM–EDS exhibited a uniform distribution of both Th(IV) and U(VI) on GO. XRD indicated that the interlayer distances of the prepared GO, GO–Th(IV), GO–U(VI), and GO–Th(IV)/U(VI) were 8.24, 8.20, 7.86, and 8.26 Å, respectively. These results suggested that the adsorption of U(VI) caused a decrease of the interlayer distance of GO, which is probably inhibits GO’s ability to adsorb metal ions due to increased inter-planar repulsion and induced steric hindrance that limits adsorption of more metal ions. Therefore, a spatial feature based mechanism of GO was proposed.
研究领域:
核化学
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环境化学
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材料科学
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放射化学
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分离科学
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DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Sitong Chen,Tao Bo,Yu Zhang,Yingcai Wang,Xiaoyan Li,Shuang Zhang,Yuhui Liu
The selective removal of thorium (Th) from rare earth element (REE)-associated mineral leachates is essential for improving REE utilization and mitigating radioactive hazards. However, high concentrations of competing metal ions and the lack of environmentally friendly separation strategies make Th(IV) recovery challenging. Here, we report a biomimetic phosphatization approach using nano zero-valent iron (ZVI bm ) and phosphoric acid to construct phosphate-coordinated surfaces for selective Th immobilization. Density functional theory (DFT) calculations reveal that H 3 PO 4 -induced surface reconstruction strengthens Th(IV) adsorption by 82.7 % (energy change from −8.004 to −14.617 eV). Batch experiments using acidic leachates containing 48.8 mg/L Th(IV) demonstrate over 98.8 % recovery efficiency at a low dosage of 0.3 g/L, reaching 99.7 % within 3.0 h. This study provides a green and effective strategy for actinide separation via surface coordination and mineralization chemistry, offering promise for radioactive waste remediation and resource recovery.
研究领域:
环境科学
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材料科学
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放射化学
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化学工程
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纳米技术
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jing Tang,Linyuan Liao,Xuexiang He,Lidan Lv,Xiangbiao Yin,Wenlong Li,Yuezhou Wei,Shunyan Ning,Lifeng Chen
212 Pb serves as one of the most important nuclides for targeted alpha therapy (TAT), with good potential in the treatment of malignant tumors. However, medical and clinical applications are seriously limited by its extremely short supply, which strongly depends on the acquisition of its parent nuclides such as 228 Ra or 224 Ra. To address this issue, we conducted a systematic investigation on the separation of trace radium from natural thorium using the ion exchange chromatography method, and a novel porous silica-based composite resin functionalized with sulfonic acid groups was prepared, characterized, and employed. Experimental results showed that the silica-supported resin was successfully prepared with the sulfonic acid groups, and possessed small particle size, mesoporous pore structure and large specific surface area. The resin exhibited high selectivity toward thorium compared with barium, and the separation factor reached 123 at low acidity and at low temperature. The resin demonstrated a fast adsorption speed and an excellent separation performance, and the adsorption mechanism was confirmed based on the ion exchange between the sodium carried and the target cations. On the basis, column experiments were further conducted and finally the separation of trace radium from thorium was realized using a small column filled with about 1.0 g resin. The chemical recovery of radium reached 97 %, and the decontamination factor for thorium exceeded 40,000. This work verifies the feasibility of directly extracting 228 Ra and 224 Ra from natural thorium using the sulfonic acid group functionalized materials in the dilute nitric acid solution, and presents an excellent material and systematic experimental data on the separation activities, rendering this study particularly significant.
研究领域:
核化学
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放射化学
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医学物理
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癌症治疗
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产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 28
·17431-17436
·
IF 3.361
Ting Yu,Zheng-hua Qian,Lin Li,Xiao-ling Wu,Hui He,Yan-bo Qiao,Guo-an Ye
Three new thorium-based MOFs based on 1,2,4,5-tetrakis(4-carboxyphenyl)benzene (H4TCPB) were obtained under a similar reaction system (metal salt, ligand, solvent, and acid are the same). Th(IV) forms the central unit of the MOFs in mononuclear and binuclear clusters, respectively. All the MOFs show blue ligand-based luminescence under an ultraviolet environment. This is the first time that multiple thorium-based MOFs with luminescence have been found with the same ligand.
研究领域:
材料科学
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化学
✓ 已验证
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Guang Wu,Shipeng He,Liwen Wang,Dating Tian
Thorium (Th) has a wide range of applications in industries such as medicine and the nuclear industry, so it is critical to develop effective detection technologies to avoid the hazards they pose to the environment and human health. In this study, we used 4, 4′, 4″-(1, 3, 5-triazine-2,4,6-triyl)tribenzoic acid (H 3 TATB) as the starting material to form a hydrogen-bonded organic framework (TATB-HOF) at room temperature by hydrogen-bonding self-assembly. We then functionalized it with Eu 3+ using a post-synthesis modification approach to produce a red-fluorescent HOF(Eu@TATB-HOF). The luminescence mechanism of Eu@TATB-HOF was caused by the ligand-to-metal charge transfer-assisted energy transfer (LMCT-ET) between TATB-HOF and Eu 3+ . Eu@TATB-HOF was stable in an aqueous solution and enabled highly sensitive detection of Th 4+ . When Th 4+ concentrations ranged from 2.0 to 37.0 mmol/L, the fluorescence intensity of Eu@TATB-HOF showed a good linear relationship with the concentration of Th 4+ ions, with a detection limit of 1.5 mmol/L. Furthermore, several methods were used to demonstrate that the fluorescence quenching of Eu@TATB-HOF by Th 4+ was mostly mediated by the inner filter effect (IFE). Finally, this probe was successfully used to detect Th 4+ ions in real samples.
研究领域:
材料科学
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分析化学
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无机化学
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环境科学
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核工程
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Yun-Han Mao,Qun-Yan Wu,Yu-Qian Zhong,Jian-Hui Lan,Hong-Bin Qi,Wei Jin,Zhi-Wei Huang,Kong-Qiu Hu,Wei-Qun Shi,Lei Mei
To mitigate ecological and public health threats of radionuclides, functional metal–organic frameworks (MOFs) can serve as ideal platforms for separation of radionuclides, but bioderived MOFs with low-cost, environmentally friendly organic blocks are still desiring. In this work, a new kind of bioderived ellagic acid (EA)-based thorium-organic framework materials is proposed for the first time. It is demonstrated that Th-EA with π–π stacking interactions for supporting the robust framework possesses excellent structural stability in aqueous solutions at pH 2–11 and achieves a maximum adsorption capacity of 229.1 mg·g −1 at pH 5 for uranyl ion through an ion-exchange process. Notably, such a bioderived material can serve a photocatalyst to produce a large amount of hydrogen peroxide (H 2 O 2 ) (≈170.2 µmol·g −1 ·h −1 ) from water and oxygen under visible light irradiation, which is able to greatly improve the uranyl removal rate to 96.2% by transforming adsorbed uranyl into the insoluble studtite phase. Furthermore, Th-EA can also serve as both excellent adsorbents and photocatalysts to achieve high-efficiency and selective removal of uranium from radio-contaminated tailing groundwater. This work demonstrates the feasibility of bioderived MOF materials for enhanced nuclide separation and will inspire the development of more low-cost, environment-friendly functional materials.
研究领域:
环境科学
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材料化学
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放射化学
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光催化
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核废料管理
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DOI
高影响因子
危险品化学品经营许可证（带存储）