JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Huaixin Hao,Qiang Zheng,Yanli Zhang,Qiange He,Xiaogui Feng,Zhipeng Wang,Jing Chen
The implementation of actinide (An) and lanthanide (Ln) group separation is one of the most critical tasks for the GANEX process to adapt nuclear fuel cycle in the Generation IV nuclear energy system. In this work, we proposed a biphasic cooperative extraction system to fulfill this aim, achieving selective extraction of hexavalent An to the organic phase by a hydrophobic extractant, N,N -di-(2-ethylhexyl)butylamide (D2EHBA), while masking trivalent or tetravalent Ln in the aqueous phase by a hydrophilic ligand, N,N,N’,N’ -tetraethyldiglycolamide (TEDGA). Efficient group separation of actinides from lanthanides was achieved with remarkable single-stage An/Ln separation factors over 10 2 . Moreover, the mechanism of An(VI)/Ln(III/IV) selectivity was analyzed by UV–Vis, FT-IR and MALDI-TOF-MS spectroscopic analyses, indicating more hydrophobic nature of An(VI)-D2EHBA complex than Ln(III/IV)-D2EHBA complex as well as much stronger masking effect of Ln(III/IV) than An(VI) by TEDGA contributing striking An/Ln separation.
研究领域:
核化学
·
放射化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Shuai Zhang,Leilei Yin,Qian Liu,Guangtong Hai,Yaping Du
The ligand effect in alloy catalysts is one of the decisive parameters of the catalytic performance. However, the strong interrelation between the ligand effect and the geometric effect of the active atom and its neighbors as well as the systematic alteration of the microenvironment of the active site makes the active mechanism unclear. Herein, Pt3Tm, Pt3Yb, and Pt3Lu with a cubic crystal system (Pm-3m) were selected. With the difference of Pt−Pt interatomic distance within 0.02 Å, we minimize the geometric effect to realize the disentanglement of the system. Through precise characterization, due to the low electronegativity of Ln (Ln = Tm, Yb, and Lu) and the ligand effect in the alloy, the electronic structure of Pt is continuously optimized, which improves the electrochemical methanol oxidation reaction (MOR) performance. The Ln electronegativity has a linear relationship with the MOR performance, and Pt3Yb/C achieves a high mass activity of up to 11.61 A mgPt−1, which is the highest value reported so far in Pt-based electrocatalysts. The results obtained in this study provide fundamental insights into the mechanism of ligand effects on the enhancement of electrochemical activity in rare-earth nanoalloys.
研究领域:
材料科学
·
催化
·
电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Yingjie Zhao,Zewen Su,Youqiang Huang,Yuan Liu,Shiqing Xu,Gongxun Bai
The dual-functional optical materials that can achieve accurate temperature sensing and effective photothermal conversion have aroused great concern in biomedical and industrial fields. However, the lack of optical functional materials limits the photothermal devices in practical applications. In this work, the pure monoclinic Ho 3+ /Yb 3+ codoped La 2 Ti 2 O 7 microcrystals have been successfully synthesized for optical thermometry and photothermal conversion. Different from the partial overlap of thermal coupling energy levels in Er 3+ , the wide separation of emission bands in Ho 3+ reduce the calculation error of ratio-metric thermometry. The maximum value of sensitivity reaches 1.41% K −1 . And the light-to-heat energy conversion of the sample has been explored by some photothermal experiments. It is confirmed that the sample can be heated to the specified temperature by adjusting the power of the heating light source. Meanwhile, the photothermal imaging can be achieved because of the high photothermal conversion of the material. Besides, the dual-functional prototype probe based on La 2 Ti 2 O 7 :Ho 3+ /Yb 3+ microcrystals has been made to investigate the temperature sensing and photothermal conversion performance. These results illustrated the sample has potential applications in optical thermometry and biological photothermal therapy.
研究领域:
材料科学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jiyuan Guo,Yihang Li,Bingbing Bao,Zishan Zhang,Rong Zhang,Hui Dan,Yi Ding
Developing new matrices capable of simultaneous immobilization of lanthanides and actinides are challenging. Herein, this paper reported the ZrSiO 4 -based borosilicate glass-ceramics with excellent immobilization capabilities of lanthanides and actinides. The phase evolution and microstructure transformation affected by the (Nd, Ce)-co-doping content were investigated systematically. The results indicated that the solubility limits of Nd and Ce in the obtained glass-ceramics decreased with increasing temperature, which were up to 18, 16 and 10 at% at 1400 °C, 1450 °C and 1500 °C, respectively. The formation rate of ZrSiO 4 increased with the increase of the (Nd, Ce)-co-doping content and temperature, which reached the highest value of 96.43 wt% with Nd and Ce content of 10 at% at 1500 °C. The densification of the obtained glass-ceramics also increased with the increase of the content of Nd and Ce. In addition, it was found that the immobilization mechanism of the resulting glass-ceramics was the synergistic immobilization effect of the ceramic crystal and glass network. This work indicated that the ZrSiO 4 -based borosilicate glass-ceramics might be promising matrices for immobilizing high-level radioactive wastes containing lanthanides and actinides.
研究领域:
材料科学
·
核废料管理
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Lu Jiang,Wei Zhang,Congguang Luo,Daojian Cheng,Jiqin Zhu
Zeolite imidazolate frameworks (ZIFs) have been applied to gas adsorption, but there remain no reports detailing the adsorption–desorption process for lanthanum metal ion (LMI). This work first testifies that ZIF-8 has a better adsorption property than ZIF-90 for remediation of LMI from water. Adsorption results demonstrate that ZIF-8 removes 100.0% of the metals ions, whose concentrations are below 20 mg L–1, and the saturated adsorption capacity is 385 mg g–1. Characterization by P-XRD, ICP, and FT-IR indicates that the main structure of ZIF-8 remained unchanged to a large extent during the adsorption process. Density functional theory (DFT) calculations illustrated that the adsorption process is spontaneous, and the adsorption site is in the center of two imidazole rings. La-ZIF-8 was subjected to two polar desorbents, acetonitrile and methyl alcohol, possessing a desorption ratio of 94.4% and 61.0%, respectively. Recycling the adsorption/desorption process using acetonitrile resulted in significant crystal structure collapse after three recycles reducing the adsorption capacity to 150 mg g–1. However, acetonitrile still maintains a desorption ratio of over 90.0%. Our work shows that ZIF-8 can be used as an efficient adsorbent in the removal of aquatic LMI, especially at trace concentration levels.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2024
·
IF 4.1
Jinyu Wu,Shaolong Han,Sichen Li,Rui Zhu,Shuaibo Shi,Shishen Zhang,Kun Zhang
Till now, there is still a lack of the convenient and efficient approach to implement identification and quantitation of fullerenes in various domains. This work provides the first example for detecting fullerenes by an adequate fluorescent probe, in parallel with the new methodology for detecting fullerenes by the fluorescent chemosensing approach. Using a multi-emission lanthanide-disalicylaldehyde coordination hybrid H 2 Q j2 /Tb 0.91 Eu 0.09 , the rapid, selective and discriminative detection of analogous C 60 and C 70 can be easily achieved after the spectral and statistical analyses of fluorescent sensing signals on four emission bands (416, 543, 447 and 615 nm), excited by two irradiation lights (370 and 394 nm). Titration experiments further verify the very high linearity for both C 60 and C 70 and allow their detection at concentrations as low as 1.72 μM (C 60 ) and 0.09 μM (C 70 ). Moreover, this fluorescent probe also shows its reliable abilities to identify proportional C 60 /C 70 mixtures and monitor C 60 and C 70 contents in actual soil sample. It is believed that our proposed lanthanide-base fluorescent matrix not only verify the feasibility and potential of fluorescent chemosensing methodology for the fullerene detection but also provide a valuable tool for potential applications.
研究领域:
化学
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELASTOMERS AND PLASTICS
·
2017
·
IF 0.787
Quan Zhou,Lu Yan,Xuejun Lai,Hongqiang Li,Xingrong Zeng
A new kind of polypropylene/ethylene–propylene–diene monomer (PP/EPDM) thermoplastic elastomer (TPE) with good mechanical properties and flame retardancy was prepared via in situ peroxide-induced dynamic vulcanization using lanthanum trimethacrylate (LaTMA) as a reinforcing agent. The morphology, structure, and mechanical properties and reinforcement mechanism of PP/EPDM/LaTMA TPE were investigated by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, rubber process analyzer, cross-link density test, and so on. The flame retardancy was investigated by limiting oxygen index (LOI) test. The results showed that when the amount of lanthanum oxide was 4.96 phr and methyl methacrylate was 7.85 phr, the compatibility between EPDM and PP was greatly improved. Besides, the tensile strength, tear strength, elongation at break, and hardness (shore A) of PP/EPDM/LaTMA TPE were increased from 6.2 MPa, 41.7 kN m−1, 148%, and 81 up to 11.1 MPa, 77.3 kN m−1, 365%, and 89, respectively. And the LOI of PP/EPDM/LaTMA TPE was increased to 19.0%. The SEM images, the higher G′, and the ionic cross-link suggested that a strong filler–filler network was formed by the polymerization and the grafted of LaTMA in the PP and EPDM phase which enhanced the compatibility between PP and EPDM. The DSC and FTIR results further proved that during the processing.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Zhe Zhang,Jianan Zhang,Shuai Chen,Yanan Liu,Yufei He,Dianqing Li
Hydrogen spillover phenomenon can significantly impact the activity in hydrogenation reaction, but the spillover is limited in a very short range on non-reducible Al 2 O 3 , a most widely used industrial support. Herein, Al 2 O 3 doped with different lanthanides (ln) was prepared by co-precipitation, which was then used to produce Pd/ln-Al 2 O 3 catalysts. These catalysts display much higher hydrogenation activity towards alkylated anthraquinone than undoped Pd/Al 2 O 3 catalyst and those modified by non-lanthanide elements. After the introduction of lanthanides, the reaction order of H 2 decreases from 1 to 0. Further characterization and DFT calculation show that H 2 storage ability is increased for ln-doped catalysts due to the low activation energy of H transfer and low adsorption energy of H on O(-ln) sites. In addition, a reasonable relationship between reducibility of ln 3+ in catalysts and the catalytic performance is found.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2014
·
IF 3.766
Xiaocun Qi,Zhiliang Wang,Songmei Ma,Lianjia Wu,Shuguang Yang,Jian Xu
The complexation behavior of PAA and lanthanide (Ln) ions was schematically investigated. As pH increased, the complexation between PAA and Ln ions will greatly strengthen because COO − groups exhibit much stronger interaction with Ln ions than COOH. When the pH values are higher than 2.5, where the ionization of PAA is about 2.0%, the PAA–Ln complex would precipitate out from the solution. The precipitation is a direct indicator for the complexation between PAA and Ln ions. Besides pH values, the complex precipitation is related with the concentration, the molar ratio, and the operation procedure. At the extremely low concentration, there is no polymer–metal complex precipitation but fluorescence spectroscopy reveals that the complexation between PAA and Ln ions still exists when pH value is higher than 2.5. When the molar ratio of PAA and Ln ions exceeds the certain level, it would produce soluble polymer–metal complex, even at the high concentration of Ln ions.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Chemistry
·
2016
·Vol. 60
·期 2
·293-298
·
IF 2.429
Huang Yishun,Wu Xuemeng,Tian Tian,Zhu Zhi,Lin Hui,Yang Chaoyong
Lanthanide elements (Ln) play an important role in industry and agriculture. As a result of the increasing consumption of lanthanides, environmental emission of Ln has become detrimental to the health of flora and fauna. Current methods for trace lanthanides detection mainly rely on sophisticated instruments. In this article, a Ln 3+ dependent DNAzyme was incorporated into a hydrogel to generate Ln 3+ sensitive DNAzyme hydrogel for portable colorimetric detection. The enzyme strand and its substrate strand act as crosslinker and functional unit of the hydrogel with polyacrylamide chains as the scaffold and gold nanoparticles (AuNPs) as the indicator of hydrogel stability. Any ions in the Ln 3+ series can trigger the cleavage of substrate strand by activating the enzyme strand, thereby decreasing the crosslink ratio and leading to collapse of the hydrogel. The release of the encapsulated AuNPs turns the supernatant wine red. Using this colorimetric method, Ln 3+ can be detected with high sensitivity, with a limit of detection (LOD) of 20 nM for Ce 3+ . The hydrogel responds specifically to any Ln 3+ ion and works well with the spiked lake sample without the need of instruments and skilled operators. Our results suggest that the lanthanide responsive hydrogel can be used for portable and sensitive detection of Ln 3+ contamination in the field.
研究领域:
生物化学
·
环境科学
✓ 已验证
DOI
高影响因子
Soft Matter
·
2015
·Vol. 12
·期 3
·867-875
·
IF 4.029
Jiali Xu,Zhiliang Wang,Lingang Wen,Xianju Zhou,Jian Xu,Shuguang Yang
Poly(acrylic acid) (PAA) and lanthanide (Ln) ions, such as Ce3+, Eu3+, and Tb3+, were prepared as dispersed complex colloidal particles through three different protocols with rigorous control of the pH value and mixing ratio. The negatively charged PAA–Ln complex particles were layer-by-layer (LbL) assembled with positively charged poly(diallyldimethyl ammonium) (PDDA) to prepare a thin film. The film thickness growth is much quicker than PDDA/PAA film. Due to the incorporation of Ln3+ ions, the film exhibits fluorescence. During LbL assembly, PDDA–PAA association based on electrostatic force and PAA–Ce association based on coordination are in competition, which leads to the LbL assembly of PDDA and PAA–Ln complex colloidal particles being a complicated dynamic process.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Yu Wang,Xiao-Hui Yang,Jian Cui,Guo-Hua Zhang
Rare-earth hexaborides (REB 6 ) are vital raw materials for cathode materials and high temperature structural ceramics that are widely applied as high-frequency electron tubes and ceramics adaptive for extreme environment, respectively. In this work, single phase substitutional solid solution REB 6 (LaB 6 , La 0.75 Ce 0.25 B 6 , La 0.5 Ce 0.5 B 6 , La 0.25 Ce 0.75 B 6 and CeB 6 ) powders were prepared with the raw materials of La 2 O 3 , CeO 2 , B 4 C and Al powders, after calcining at 1773 K for 4 h and the following alkaline leaching. All substitutional solid solution products have homogeneous distributions of La and Ce in particles. Through microscopic morphology analysis, it is discovered that the formation of solid solution is beneficial for reducing the particle size of product, relative to LaB 6 and CeB 6 . Moreover, Al flux plays an important role in decarbonizing reaction, and C contents of all products are below 0.4 wt%.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）