SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Di Zhang,Bing Zhao,Lijie Liu,Hao Tang,Xiangxue Wang,Shujun Yu
Although two-dimensional transition metal carbides and carbonitrides (MXenes) are becoming increasingly popular in contaminant remediation field, the preparation of MXene nanosheets that can efficiently eliminate the target pollutants still deserves in-depth investigation. Here we produced amidoxime Ti 3 C 2 T x nanosheets (TC-AO), which were efficient radionuclide adsorbents with high stability and positive affinity, by introducing the amidoxime group into the Ti 3 C 2 T x MXene surface through grafting by diazonium salt. The high stability and abundant functional groups of TC-AO were demonstrated by different characterization techniques such as scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analyzer (TGA), and X-ray photoelectron spectroscopy (XPS). Multiple factors affecting the radionuclide removal performance were explored, including reaction time, temperature, pH, ionic strength, anions and cations. The experimental results demonstrated that the radionuclide uptake by TC-AO was a heat-absorbing, spontaneous single-molecule chemisorption process and was consistent with the pseudo-secondary and Langmuir models. When pH < 6, the mechanism of uranium removal was inner complexation, and as the pH continued to increase, uranium removal shifted to outer complexation. Furthermore, the results certificated that TC-AO exhibited fast reaction kinetics (reaching equilibrium in about 20 min), excellent removal efficiency (279.57 mg U·g −1 and 73.99 mg Eu·g −1 ), outstanding selectivity and good stability. The studies showed that TC-AO had good stability and functionality, which was not only valuable for the design of MXene based adsorbents, but also provided a meaningful option for the extraction of radioactive pollutants from wastewater.
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Zhibin Lai,Jun Ye,Jian Xiong
A series of fluorescent nanocomplexes of carboxymethyl cellulose (CMC)/Terbium (Tb)- Europium (Eu) were successfully synthesized without introducing a second ligand. By adjusting the concentration of the coordinated ions, these nanocomplexes exhibit favorably visibly tunable luminescence properties with colors being able to change from green to red. The XPS analysis demonstrates the formation Tb(III)-O 2− and Eu(III)-O 2− between OH and COO − in CMC and Tb 3+ or Eu 3+ ions, which is advantage for light absorption by UV–Vis spectroscopy and fluorescence spectroscopy. The ligand CMC plays a role in coordinating with terbium and europium ions, but also serves as an energy donor to these metal ions by antenna effect. Moreover, the energy transfer also occurred from terbium ions to europium ions in CMC matrix, which is responsible for the tunable luminescence properties of these complexes.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Zhongqian Hu,Qingyou Deng,Shuaishuai Yang,Dongcai Guo
A series of novel 2-quinolone ligands and their corresponding Eu(III) complexes were prepared. The effect of different solvents, different ligand concentrations and different substituents on the fluorescence intensity of ligands were investigated in detail. The fluorescence intensity of Eu(III) complexes were studied by comparing different substituents on the ligand. The results indicate that all ligands show the strongest fluorescence intensity in ethanol with the ligand concentration of 50 μM. Among these ligands, the ligand (K 6 ) containing -COOCH 3 group owns the strongest fluorescence intensity and the corresponding fluorescence quantum yield reaches 0.317. All complexes exhibit characteristic red light of Eu(III) ions with good thermal stability. The effect of diverse substituents on the fluorescence intensity is ordered: -COOCH 3 >-Cl> -Br> -OCH 3 >-CH 3 >-H, which indicates the complex [EuK 6 (NO 3 ) 3 ]·2H 2 O with the strongest electron-donating group (-COOCH 3 ) possesses the strongest fluorescence intensity. The above analysis shows that the ligand (K 6 ) and corresponding Eu(III) complex [EuK 6 (NO 3 ) 3 ]·2H 2 O own the best fluorescence property, which has an outstanding application prospect in the field of optical materials and biomedicine materials.
✓ 已验证
产品关联
DOI
高影响因子
Biomedical Optics Express
·
2023
·Vol. 15
·期 1
·306-318
·
IF 3.4
Lianyu Zhang,Jinhua Liu,Linlin Tian,Dong Zhang,Dong Zhang,Qingru Wang
Plasmonic nanostructures have great potential for improving the radiation properties of emitters. Here, the plasmonic Au nanorods-PVA nanocomposite films are used to uniformly improve the photoluminescence of Tb/Eu co-doped PMMA film within the local micro-region. Under the excitation of 292 nm, the maximum enhancement factor is 37.2-fold for emission at 612 nm and 21.6-fold for emission at 545 nm. Moreover, the finite different time domain simulations are developed to further explain the experimental results. It is indicated that the modulation of luminescence can be attributed to the increase of the local density of optical states through the Purcell effect and the improvement of the energy transfer efficiency between Tb and Eu. Under the excitation of 360 nm, the maximum enhancement factor is about 71.5-fold. In this case, the Au nanorods are mainly used for modulating the emission process at 612 nm, which deduced a greater enhancement factor at 612 nm. This study provides a deep understanding of the interactions between rare earth ions co-doped materials and plasmonic nanostructures, building a bridge to fabricate a useful platform for several applications, such as thin film-based detectors and sensors.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jiaying Yan,Yayu Guan,Barbara Marchetti,Yuyu Liu,Fanghua Ning,Jin Yi,Xiao-Dong Zhou
Electrochemical reduction of CO 2 (ERCO 2 ) is an effective way to convert CO 2 into useful chemical products. However, most catalysts used for ERCO 2 show poor selectivity and stability. Here, we design a Bi 8 Eu 1 bimetallic catalyst, which exhibits both excellent stability (>400 h) and Faradaic efficiency for formate production (∼100% at − 0.89 V RHE ). Moreover, high Faradaic efficiency (>97%) is observed over a wide potential window (from − 0.89 V RHE to − 1.19 V RHE ). In a flow-cell, the Bi 8 Eu 1 catalyst shows an ultra-high current density of 250 mA cm −2 at − 0.77 V RHE . Density functional theory calculations indicate that the Bi-Eu interactions activate the Bi sites for strongly stabilizing *OCHO intermediates, thus promoting the conversion of CO 2 to formate. This work provides insights into the design of excellent electrocatalysts for ERCO 2 with improved activity and durability.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Xiaoyu Song,Xianxian Wang,Xuewen Xu,Xin Liu,Xiaoli Ge,Fanbin Meng
The Sr 2 CaWO 6 : RE 3+ (RE = Dy, Sm and Eu) phosphors with the unusual emissions corresponding to the magnetic-dipole (MD) transition were synthesized via a sol-gel process. The crystal structure, electronic properties, photoluminescence excitation and emission spectra, and fluorescence lifetimes of the as-prepared samples were investigated. X-ray diffraction analysis confirmed that Sr 2 CaWO 6 crystallized in the monoclinic structure with the centrosymmetric monoclinic space group (P2 1 /n). The indirect band gap for Sr 2 CaWO 6 was 4.24 eV, which was calculated within the framework of density functional theory (DFT). The phosphors could be excited by the ultra-violet (UV) light at 280 nm, and exhibited characteristic emissions corresponding to the MD transitions for different RE 3+ ions. The WO 6 groups in the host lattice can absorb UV light efficiently, and then transferred the energy to activator ions. The results indicated that the doped rare earth ions occupied the centrosymmetric site in Sr 2 CaWO 6 lattice. With increasing the concentration of the dopants , the local symmetry of the activator ions can be effectively changed, which resulted in the enhancement of the characteristic emissions dominated by the electric-dipole (ED) transitions of the doped RE 3+ . The Sr 2 CaWO 6 : Sm 3+ phosphor exhibited near white emission under radiation of 280 nm.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Jinting Zhu,Linhan Fan,Wenqing Li,Xinru Qi,Changyan Sun,Wenjun Li,Zhidong Chang
The accumulation of heavy metal ions in nature will not only lead to the further deterioration of the environment, but also directly do harm to human health. And as a gas pollutant, excessive inhalation of formaldehyde is also harmful to human health. Herein, a novel Eu-MOF was synthesized by solvothermal method using Eu 3+ , 2-pyridine-4-yl-3H-benzimidazole-5-carboxylic acid (HL) and 1,10-phenanthroline (phen), which can be used as a ratio fluorescent probe to detect Hg 2+ , Cd 2+ and formaldehyde, and the limits of detection(LOD) can reach 34, 9.91 and 194 nM respectively. Among them, the LOD of Eu-MOF for Cd 2+ has reached the lowest level at present. Noticeable, Eu-MOF can detect formaldehyde in both liquid and gas phases, and the response time is extremely short. In addition, Eu-MOF has been applied to trace detection of Hg 2+ and Cd 2+ in tap water, lake water and sea water with satisfactory recoveries (ranging from 98.10 % to 103.0 %). A program has been developed for quickly calculating the concentration of the substances to be detected by capturing the fluorescent color of the solvents under the ultraviolet light.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
·
2024
·
IF 5
Deliang Zeng,Tianyong Mao,Ziyi Zhang,Jing Dai,Junpeng Ouyang,Zhipeng Xie
We report the performance of an all-rare earth redox flow battery with Eu 2+ /Eu 3+ as anolyte and Ce 3+ /Ce 4+ as catholyte for the first time, which can be used for large-scale energy storage application. The cell reaction of Eu/Ce flow battery gives a standard voltage of 1.90 V, which is about 1.5 times that of the all-vanadium flow battery (1.26 V). Large standard voltage is conducive to the improvement of battery energy density and power density. The Eu 2+ /Eu 3+ electrode reaction in a NaCl solution on platinum electrode was investigated detailedly using cyclic voltammetry, linear sweep voltammetry, tafel plot and chronoamperometry. Unlike zinc-cerium flow battery, the active species of Eu/Ce flow battery are always present in the electrolyte, and no liquid-solid phase transition occurs. Thus, Eu/Ce flow battery is free of the problems associated with dendrite growth and theoretically have a longer cycle lifetime. The negative electrolyte is very sensitive to oxygen and can directly cause battery failure if exposed to air. The average energy efficiency of Eu/Ce flow battery exposed to air is only 22.0 %. However, the average energy efficiency of Eu/Ce flow battery stripped of oxygen reaches 82.7 % at 25 mA/cm 2 . Preliminary experimental studies have shown that Eu/Ce flow batteries are a promising method for large-scale energy storage.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Rong Han,Yusong Pan,Chao Du,Yanlei Xiang,Yuanqing Wang,Hongwu Zhu,Chengjie Yin
Aqueous zinc ion batteries (AZIB) have become a research hotspot for energy storage systems (ESS) in recent years due to some advantages such as their low risk and low cost. However, the structural collapse during charging and discharging affects the reversibility of the battery , which is a very serious blow to manganese-based materials and will affect their subsequent development in batteries. Therefore, β-MnO 2 cathode materials doped by the rare earth element europium (Eu) were prepared by a simple hydrothermal method . Compared with β-MnO 2 , Eu-doped MnO 2 possessed a high specific capacity of 409 mA h g −1 at 0.2 A g −1 . The initial specific capacity of Eu-doped MnO 2 at 1 A g −1 was 200.23 mA h g −1 and the maximum discharge specific capacity of 254 mA h g −1 was reached at 128 cycles. The energy storage mechanism of the electrodes was investigated by ex-situ XRD and ex-situ XPS tests. It was found that Eu element doping to β-MnO 2 not only maintains the stability of the crystal structure during redox reaction, but also promotes the embedding reaction of H + /Zn 2+ . The combination of rare earth elements Eu and MnO 2 is a new direction in the development path of aqueous zinc ion batteries.
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Yujun Wang,Ruiqing Wang,Xiang Zheng Kong,Xubao Jiang,Xiaoli Zhu,Shusheng Li
Multicolor lanthanide-doped polymers have found versatile applications in data encryption, sensing, and smart display. However, multiple components, sophisticated design, and complex preparation procedures are often required. In contrast, their intrinsic and multicolor fluorescence emission is been effectively used. Herein, Eu-doped polyurethane (ETP@PU), integrating tunable multicolor emission, self-healing, and multi-responsiveness, is prepared through a facile route via step-growth polymerization of PU using commercial Eu-ligand (Eu(TTA) 3 Phen, ETP) as a fluorophore. FTIR and XPS analysis demonstrate the successful coordination of Eu 3+ with carbamate groups of PU, which not only enhances the mechanical properties of PU but also bestows unique luminescent properties. With increasing ETP content, the intrinsic fluorescence of PU declines, while that of Eu displays a discernible enhancement, resulting in the tunable multicolor emission. The highest quantum yield of Eu-related emission reaches 71.3% due to the robust coordination and efficient energy transfer between Eu 3+ and PU. Moreover, the ETP@PU exhibits excellent self-healing capacity and multi-responsiveness, and their potential applications are also investigated in the field of light-emitting diodes, data encryption, and self-healing process monitoring. This work provides a facile and efficient strategy to develop multicolor lanthanide-doped polymers promising for various applications.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yucheng Li,Xuechun Yang,Kuan Ren,Yulin Liu,Zhan Xu,He Feng,Keli Deng,Bo Deng,Wanli Shang,Jianjun Dong,Feng Wang,Qianli Li,Xuyong Yang
X-ray imaging has garnered widespread interest in biomedical diagnosis and nondestructive detection. The exploration of radio-photoluminescence has hastened the advancement of X-ray information storage. However, significant challenges persist in achieving the prolonged imaging of curved objects without attenuation. Here, europium-doped strontium fluoride (SrF2:Eu) is meticulously created to exhibit a linear response to an extensive range of X-ray doses (maximum dose > 5000 Gy), showcasing excellent X-ray information reading/erasing reusability properties (10 cycles). This is accompanied by a red-to-blue emission transition under UV excitation, sustaining for 150 days without attenuation. To elucidate the phenomena of irradiated photoluminescent discoloration and the reversible X-ray storage of SrF2:Eu, we propose an electron-vacancy trap (valence conversion) mechanism, information stably retained by the SrF2:Eu-based device under ambient conditions due to high energy barriers. The time-lapse readout capability is further demonstrated for three-dimensional imaging of curved objects (10 lp mm–1) based on SrF2:Eu embedded within a polydimethylsiloxane (SrF2:Eu@PDMS). The SrF2:Eu demonstrates time-lapse imaging, reversible radio-photoluminescence, and recoverable X-ray storage, offering a promising avenue for optical information encryption and anticounterfeiting applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2024
·Vol. 26
·期 25
·17622-17630
·
IF 2.9
Yuwen Yuan,Yunpeng Wang,Pragati Awasthi,Wenkun Dong,Dong Chen,Xvsheng Qiao,Zhiyu Wang,Guodong Qian,Xianping Fan
The in vitro detection applications of europium complex-doped microspheres mainly rely on strong fluorescence intensity and a well-defined morphology. In this work, using methyl methacrylate-modified polystyrene microspheres has been proven an effective strategy to enhance the fluorescence and morphology of Eu-complexes. The experimental results showed that the modification resulted in the formation of a porous structure within the polystyrene microspheres, enhancing the doping uniformity and facilitating a more significant accumulation of fluorescent molecules. Furthermore, because of their encapsulation ability, microspheres efficiently confine the fluorescent molecules within them. In addition, the nano-scale porous structure endowed the microspheres with enhanced properties without compromising solvent swelling capability, thereby significantly boosting the fluorescence performance of porous PSMMA. In lateral flow immunoassays (LFIAs), PSMMA-Eu microspheres were effectively utilized to detect fentanyl with exceptional sensitivity by capitalizing on these benefits, capable of detecting concentrations as low as 0.10 ng mL−1. This technology has significant potential for rapid point-of-care screening and clinical applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）