APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xin Zhong,Wen Liang,Zhipeng Lu,Baowei Hu
In this investigation, TpPa-1 were synthesized and exploited for radionuclides ions elimination. According to Langmuir model, at pH 6.5 and 298 K, the maximum adsorption quantity of TpPa-1 were 1194.07 mg(U(VI))/g and 1107.63 mg(Eu(III))/g, respectively. The superior adsorption performance could be attributed to: (i) a great quantity of heteroatom activated sites on the pore wall could conduct as cation receptors; (ii) the forming intramolecular C N … H … O hydrogen bonding in the network of TpPa-1, which was U(VI) and Eu(III) ions adsorption sites; (iii) hydrogen bonding could adjust the electron density of the complex and abate the total charge of radionuclides. The outcomes of this work suggest that TpPa-1 is a promising adsorbent, which is appropriate to enrichment and separation radionuclides from polluted wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
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.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Lianjun Song,Xueyu Wang,Dongqi Wang,Qian Xiao,Haowei Xu,Qiuju Li,Lanlan He,Songdong Ding
The synthesis, Eu 3+ complexation, and selective solvent extraction of Am 3+ over Eu 3+ in nitric acid solution by 2-carboxamido-6-(1 H -pyrazol-3-yl)-pyridines (A-PzPy) ligands were described. Without the aid of any lipophilic anion source, A-PzPy ligands in methyl isobutyl ketone (MIBK) diluent demonstrated a more favorable affinity of Am 3+ than Eu 3+ at high acidity levels. Slope analysis showed the formation of 1:2 metal/ligand extracted species. The extraction was a spontaneous exothermic process. The analyses of fluorescence titration, Fourier transform infrared (FT-IR), Raman, time-resolved laser fluorescence spectrum (TRLFS), electrospray ionization mass spectrometry (ESI-MS), conductivity and microcalorimetric titration revealed that the composition of complex is [Eu(NO 3 ) 2 (H 2 O)∙2(Et- p -Tol-A-PzPy)](NO 3 ). Combining the results of solvent extraction and complexation study, the extraction mechanism was proposed. Furthermore, the stability constants (log β ) and thermodynamic parameters (Δ H , Δ S , Δ G ) for complexation of Eu 3+ with Et- p -Tol-A-PzPy were also presented.
研究领域:
化学
·
核化学
·
环境科学
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2018
·
IF 4.155
Li Yinong,Tian Chen,Liu Weizhen,Xu Si,Xu Yunyun,Cui Rongxin,Lin Zhang
Nano-Mg(OH)2 is attracting great attention as adsorbent for pre-concentration and recovery of rare earth elements (REEs) from low-concentration solution, due to its superior removal efficiency for REEs and environmental friendliness. However, the nanoparticles also cause some severe problems during application, including aggregation, blockage in fixed-bed column, as well as the difficulties in separation and reuse. Herein, in order to avoid the mentioned problems, a carbon cloth (CC) supported nano-Mg(OH)2 (nano-Mg(OH)2@CC) was synthesized by electrodeposition. The X-ray diffraction and scanning electron microscopy analysis demonstrated that the interlaced nano-sheet of Mg(OH)2 grew firmly and uniformly on the surface of carbon cloth fibers. Batch adsorption experiments of Eu(III) indicated that the nano-Mg(OH)2@CC composite maintained the excellent adsorption performance of nano-Mg(OH)2 toward Eu(III). After adsorption, the Eu containing composite was calcined under nitrogen atmosphere. The content of Eu2O3 in the calcined material was as high as 99.66%. Fixed-bed column experiments indicated that no blockage for Mg(OH)2@CC composite was observed during the treatment, while the complete blockage of occurred to nano-Mg(OH)2 at an effluent volume of 240 mL. Moreover, the removal efficiency of Mg(OH)2@CC was still higher than 90% until 4,200 mL of effluent volume. This work provides a promising method for feasible application of nanoadsorbents in fixed-bed process to recycle low-concentration REEs from wastewater.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Xinrui Zhang,Xianghe Kong,Liyong Yuan,Zhifang Chai,Weiqun Shi
Tetradentate 1,10-phenanthroline-2,9-dicarboxamide (PDAM) derivatives have been well documented as effective binding ligands toward MA(III) and Ln(III), while the structural analysis and species determination of the complexes are still limited. Herein, we report a combined study on the coordination of Eu(III) with PDAM derivatives using electrospray ionization mass spectrometry (ESI-MS), time-resolved laser-induced fluorescence (TRLIF), and density functional theory (DFT) calculations. PDAM derivatives here involve N,N′-diethyl-N,N′-diethyl-2,9-diamide-1,10-phenanthroline (Et-Et-DAPhen), N,N′-dibutyl-N,N′-dibutyl-2,9-diamide-1,10-phenanthroline (But-But-DAPhen), and N,N′-dihexyl-N,N′-dihexyl-2,9-diamide-1,10-phenanthroline (Hex-Hex-DAPhen). The collision-induced dissociation (CID) test shows that these alkyl-DAPhen ligands coordinate strongly with Eu(III), given that the coordination moieties remain intact during CID. The 1/2 EuIII–L species was found to be the dominant component for all three ligands, as evidenced by ESI-MS and fluorescence titration. The fluorescence decay results indicate that the hydration numbers of Eu(III) are reduced from 9 to 1 upon complexation, in agreement with the fact that the 1/2 EuIII–L species are formed, and eight water molecules are exactly replaced by eight donor atoms of two alkyl-DAPhen ligands. In addition, the DFT calculations suggest that the 1:2 EuIII–L species is more stable than the 1/1 EuIII–L species and the Eu–oxygen/nitrogen (Eu–O/N) bonds have a dominant ionic character, with the O atoms having stronger electron-donating abilities toward Eu(III) in comparison to the N atoms.
研究领域:
化学
·
物理化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Junming Zhou,Hongmei Liu,Dong Liu,Peng Yuan,Hongling Bu,Peixin Du,Wenxiao Fan,Mengyuan Li
Weathered crust elution-deposited rare earth (WED-RE) ores are important rare earth element (REE) resources around the world. In these ores, the REE are believed to mainly exist as exchangeable REE(III) ions on the surfaces of clay minerals, such as tubular halloysite and platy kaolinite . However, the mechanisms underlying the sorption and desorption of REE(III) ions on clay minerals in the environment of weathered crusts remain ambiguous. In this study, the sorption/desorption characteristics of Eu(III) ions onto halloysite and kaolinite were investigated. The results revealed that Eu(III) was adsorbed onto both clay minerals through inner-sphere complexation and outer-sphere complexation, where the former was the primary sorption mechanism. Halloysite displayed a higher sorption capacity for Eu(III) than kaolinite in a weakly acidic environment (pH 4–6). The desorption efficiency increased with the increasing concentration of NH 4 + ions. When the NH 4 + concentration was 0.002 mol/L, which is similar to the typical cation concentration of groundwater/rainwater, the amount and rate of Eu(III) desorption from halloysite were lower than those from kaolinite. The desorption of Eu(III) ions from the two clay minerals is proposed to be governed by the attraction between the outer-sphere complexes and clay minerals when the NH 4 + concentration is 0.002 mol/L. Therefore, halloysite has a higher sorption capacity and stronger retention capacity for Eu(III) than kaolinite, which suggests that halloysite may play a greater role in REE(III) enrichment in WED-RE ores than kaolinite owing to the similar chemical properties of REE(III) ions. The fundamental results obtained in this study afford new insights into the migration of REE and the role of clay minerals in REE enrichment during ore formation.
研究领域:
地质学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xuemei Wei,Xiankui Cheng,Xinyu Zhang,Guodong Sheng,Huiting Xu
The utilization of biocompatible and inexpensive adsorbents for the effective scavenging of U(VI) and Eu(III) from wastewater is still an open challenge in nuclear waste management. Herein, three kinds of α-Fe 2 O 3 nanocrystals with different morphologies, i.e., α-Fe 2 O 3 nanospheres (HNSs), nanoplates (HNPs) and nanorods (HNRs), which were exposed (1 0 2), (0 0 1), and (1 1 0) facet, respectively, was used to scavenge U(VI) and Eu(III) from aqueous solutions via an adsorption procedure. Various techniques of N 2 adsorption–desorption, FT-IR, XRD, XPS, TEM, SEM and EDS were applied to characterize these adsorbents before or after adsorption. The results indicated that the adsorption capacity of U(VI) and Eu(III) was in the order of HNPs (0 0 1) > HNRs (1 1 0) > HNSs (1 0 2), namely, α-Fe 2 O 3 nanoplates was proved to be a good adsorbents, with removal capacity of 221 mg/g and 131 mg/g for U(VI) and Eu(III) scavenged on HNPs, respectively. The kinetics of U(VI) and Eu(III) scavenging agreed with the pseudo second order kinetic model, suggesting that chemical interaction is mainly responsible for U(VI) and Eu(III) scavenging on these materials. Furthermore, the Freundlich model fit the best for adsorption isotherms of U(VI) and Eu(III). The present study demonstrated that these α-Fe 2 O 3 nanocrystals are promising materials in nuclear waste management.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTEGRATED FERROELECTRICS
·
2021
·
IF 0.836
Peisong Tang,Xuezhi Wei,Liqin Zhang,Ruipeng Hou,Yifan Zhou
Using Eu2O3 as source of tritium, anhydrous ethanol as solvent system, three β-diketone compounds of 2-thienyl trifluoroacetone (TTA), acetylacetone (Hacac), 1-(4-Methoxyphenyl)- 3-(4-tert-butylphenyl)-1,3-propanedione (Avobenzone) as first ligand and 1,10-phenanthroline (Phen) as second ligand, the three kinds europium (III) ternary complexes were prepared by precipitation method at 60 °C. The complexes were characterized by fluorescence spectroscopy (FS), Fourier transform infrared spectroscopy (FT-IR), thermogravimetry and differential scanning calorimetry (TG-DSC) and color coordinates. The results show that three red light-emitting europium (III) ternary complexes can emit strong red characteristic fluorescence. Thereinto, Eu(TTA)3Phen has the best luminescent performance. The excitation spectrum of Eu(TTA)3Phen is 395 nm, the characteristic emission peak is at 612 nm, and the color coordinate is (0.66, 0.34). Eu(TTA)3Phen show good thermal stability which is decomposed more than 200 °C.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Xiayu Liang,Aylin M. Deliormanlı,Qingle Zeng
A novel composite material, Poly(IL-AA)@MIL-101(Cr), combining metal-organic framework, polymeric ionic liquid and acrylic acid, was synthesized for the selective and efficient adsorption of rare earths europium(III) (Eu 3+ ). Characterization of the materials was carried out using techniques such as X-ray diffraction (XRD), Fourier transform infrared (FTIR), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), thermogravimetric analysis (TGA) and Brunauer-Emmett-Teller (BET). The results demonstrate successful incorporation of the polymeric ionic liquid onto the material surface while preserving the crystal structure and morphology of MIL-101(Cr). Adsorption experiments were conducted to explore parameters including solution pH, initial Eu 3+ concentration, and duration, with comprehensive analyses of adsorption kinetics, isotherms, and mechanisms. Findings reveal that Poly(IL1-AA)@MIL-101(Cr), Poly(IL3-AA)@MIL-101(Cr), and Poly(IL5-AA)@MIL-101(Cr) achieve adsorption equilibrium for Eu 3+ at approximately 9 h with an equilibrium pH of 6.2. The adsorption of Eu 3+ predominantly follows a pseudo-second-order kinetic model and Langmuir isotherm adsorption model. Moreover, the prepared composite material exhibits superior adsorption selectivity for Eu 3+ over other metal ions in the mixture (K + , Mg 2+ , Ni 2+ , Co 2+ , Zn 2+ , La 3+ , and Nd 3+ ). Even after five adsorption-desorption cycles, the composite material maintains satisfactory adsorption performance.
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
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2024
·Vol. 225
·期 18
·2300440
·
IF 2.5
Fang Ye,Jun Ye,Jian Xiong,Qiang Li
Fluorescent hydrogel as an advanced material has been used for anti-counterfeiting, probe detection, and optical devices. A facile strategy to prepare fluorescent hydrogel is developed by carboxymethyl cellulose (CMC) with Europium(III) and polyvinyl alcohol (PVA). The hydrogel forms a physical cross-linking network under mild reaction conditions without using volatile organic chemicals. The addition of CMC-Eu(III) improves the mechanical properties of the hydrogel. At 15% CMC-Eu(III), the hydrogel reaches its maximum tensile and compressive stress, which are 47.25 ± 10.35 and 10.14 ± 1.90 kPa, respectively. Meanwhile, the hydrogels exhibit a 5 D 0 → 7 F 2 characteristic emission peak assigned to Eu 3+ , which emits stable red fluorescence under 254 nm ultraviolet (UV) light. When this hydrogel is applied to paper, the paper showed hidden fluorescent dots under UV light. This additive also enhances the mechanical properties of the paper, which reveals the multifunctionality of this fluorescent hydrogel for anti-counterfeiting and reinforcement.
研究领域:
材料科学
·
光学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2020
·
IF 3.306
Yinsheng Xu,Xiaoxiong Zhang,Wenjun Zhang,Xin Liu,Qianqian Liu
Herein, we report an ammonia-responsive of lanthanide (Eu(Sal) 3 , Sal = salicylic acid) complexes hydrogel sensors based on the amine molecule affecting the energy transfer process. In this system, the ammonia stimulation causes the coordination and decomposition of Eu(Sal) 3 in the hydrogel, thus leading the fluorescence quenching and recovery of Sal in the ammonia atmosphere. Furthermore, the EuL n -Fm/PVA hydrogel composed of Eu(Sal) 3 and Eu(TTA) 3 complexes (TTA = 2-Thenoyltrifluoroacetone, L = Sal and TTA, Fm = formamide, n = 1-3) was prepared by an one-pot process, which achieves the continuous detection for ammonia gas. Meanwhile, EuL n -Fm/PVA hydrogel also achieved diverse responses for ammonia gas. This device could be a promising strategy for developing fluorescence hydrogels with potential applications due to its desirable advantages such as simple preparation, cost-effectiveness, etc..
研究领域:
化学
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
MRS Communications
·
2018
·Vol. 8
·期 3
·1224-1229
·
IF 3.008
Junlan Guo,Jianguo Tang,Jing Wang,Sui Mao,Haidong Li,Yao Wang,Jin Liu,Jing Wang,Yanxin Wang,Linjun Huang,Matt J. Kipper,Laurence A. Belfiore
This paper presents new water-soluble bio-polyelectrolyte-based nanoparticles, formed from lanthanide-induced polysaccharide aggregates (LIPAs). These new nano-aggregates are formed by coordinating a photoluminescent lanthanide–ligand complex to a single polyelectrolyte [i.e. polyanionic hyaluronic acid (HA)] or to two oppositely charged polyelectrolytes [i.e. HA and polycationic chitosan (CHI)]. We demonstrate that photoluminescent Eu3+–ligand complexes, which are dispersed homogeneously in aqueous solution by the association with water-soluble HA. The polysaccharide supermolecular assembly can be tuned to obtain nanoparticles of different sizes and surface charges. The preparation of stable and water-soluble lanthanide complexes via Eu3+–LIPAs opens opportunities for use of luminescent lanthanides in aqueous environments, for biosensing and bioimaging applications.
研究领域:
生物材料
·
生物医学工程
·
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）