JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Pan Sun,Kun Huang,Huizhou Liu
Separation and recycling of rare-earths using ionic liquids as extractant are becoming a promising approach to replace traditional volatile organic solvents in recent years. Generally, the addition of some special salts could improve the extraction efficiency of rare-earths by numerous non-functional ionic liquids. However, knowledge behind the nature of the salt effect is limited. Here, we found that the enhancement in the extraction of rare-earth ions, Pr 3+ ions, using non-functional ionic liquid, [A336][NO 3 ] (Tricaprylmethylammonium nitrate) was driven by the synergism of Hofmeister bias and complexation behaviors of salt anions with Pr 3+ ions. Molecular dynamic simulations offered a new insight into the interaction mechanism of the ionic liquid with Pr 3+ ions at liquid/liquid interface. It was revealed that salt anions could perform as a bridge to connect Pr 3+ ions and the ionic liquid, so that promoted the extraction of Pr 3+ ions. Therefore, the strong complexation ability of salt anions with Pr 3+ ions and poor hydration of salt anions faciliated the transport of Pr 3+ ions across liquid/liquid interface.
研究领域:
化学工程
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材料科学
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环境科学
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DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Jin Zhou,Andi Liu,Fangyuan Song,Langsheng Ling,Jingxin Li,Wei Tong,Zhengcai Xia,Gaoshang Gong,Yongqiang Wang,Jinkui Zhao,Hanjie Guo,Zhaoming Tian
Compared with the intensive investigation on 3d transition metal (TM)-based spin ladder compounds, less attention has been paid to the ones constructed by rare earth (RE) ions. Herein, we report a family of RE-based spin ladder compounds Ba2RE2Ge4O13 (RE = Pr, Nd, Gd–Ho) crystallized into a monoclinic structure with the space group C2/c. The RE ions are arranged on a two-leg spin ladder motif along the b-axis, where the rung and leg exchange interactions are bridged via RE–O–RE pathways and RE–O–Ge–O–RE routes, respectively. Moreover, the much shorter rung distance in RE2O12 dimer units than the leg distance suggests that Ba2RE2Ge4O13 compounds are strong-rung spin ladder systems. All of the synthesized Ba2RE2Ge4O13 (RE = Pr, Nd, Gd–Ho) compounds exhibit dominant antiferromagnetic (AFM) interactions and the absence of magnetic order down to 1.8 K. Among the family members, Ba2Dy2Ge4O13 can be described by Jeff = 1/2 Kramers doublet states, and the low-temperature specific heat indicates the coexistence of the spin-dimerized state with a broad maximum at ∼2.4 K and long-range AFM order with TN = 0.81 K. This family of Ba2RE2Ge4O13 compounds thereby provides a rare platform to investigate the novel spin ladder physics constructed by 4f electrons.
研究领域:
凝聚态物理
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磁学
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无机化学
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量子材料
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DOI
高影响因子
DALTON TRANSACTIONS
·
2026
·
IF 3.3
Jian-Long Lei,ShuiSheng Li,Xi Zhen,Lu Shen,Bin He
Nickel-iron layered double hydroxide (NiFe-LDH), as a highly promising non-precious metal catalyst for the oxygen evolution reaction (OER), still suffers from several inherent drawbacks, including poor electrical conductivity, insufficient exposure of active sites, and a decline in performance under high current densities. These limitations severely restrict its practical application in the oxygen evolution reaction. Herein, a nanosheet morphology Pr-doped NiFe layered double hydroxide catalysts (Pr-NiFe-LDH) was synthesized in situ on the surface of Nickel foam modified by dielectric barrier discharge (DBD) plasma (PNF). The addition of Pr elements can effectively adjust the electronic structure of NiFe-LDH, change the position of the d-band center, and increase the number of active sites, thereby enhancing the catalytic activity. The overpotential of Pr-NiFe-LDH was reduced to 321 mV at 100 mA•cm -², significantly lower than that of NiFe-LDH (342 mV) and even superior to that of commercial RuO₂ catalyst (441 mV). The density functional theory (DFT) study indicates that adding Pr to the surface of NiFe-LDH enhances its performance in the OER. This work not only deepened the understanding of the OER mechanism in the NiFe-LDH catalyst, but also provided valuable insights for the design of efficient, low-cost and noble-metal-free electrocatalysts.
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DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Xianyu Wang,Zhicheng Ding,Min Zhang,Jiayue Liu,Zhuoli Shen,Zhihong Du,Hailei Zhao
Site-specific doping in perovskite induces distinct defect type and concentration. • Pr doping at A-site of BaFeO 3–δ causes reduced [ V O ⋅ ⋅ ] and basicity. • Pr doping at B-site causes increased [ V O ⋅ ⋅ ] , basicity, and enlarged lattice volume. • B-site Pr-doping enhances the hydration capability and proton diffusivity. • B-site Pr-doping electrode reduces R p and enhances electrode reaction kinetics. Lattice and electron defects, as well as O 2– basicity, in protonic ceramic electrochemical cells (PCECs) play a pivotal role in determining electrode reaction kinetics. Herein, we adopt the same dopant (Pr 3+ ions) to modulate the structure and properties of BaFeO 3–δ via substitution at its A- or B-site, and elucidate the mechanism underlying the performance discrepancy. The rare-earth element Pr 3+ is structurally compatible with both A-site Ba 2+ and B-site Fe 3+ cations, enabling substitution at either site to maintain a stable cubic perovskite structure. Compared to A-site doping (Ba 0.9 Pr 0.1 FeO 3–δ , BPrF), Pr doping at B-site (BaFe 0.9 Pr 0.1 O 3–δ , BFPr) increases oxygen vacancy concentration, elevates O 2– basicity and enlarges lattice volume, which enhance the proton uptake capability and promote the proton transportation. Meanwhile, Pr doing at B-site optimizes the Fe 3d- e g electron filling, which facilitates the charge transfer process. All these favorable effects synergistically boost the electrode reaction kinetics. As a result, the B-site doped BFPr demonstrates a low polarization resistance of 0.264 Ω·cm 2 at 600 °C, approximately half that of the BPrF, achieves an electrolysis current density of 2.19 A·cm⁻ 2 at 1.3 V and a peak power density of 1.02 W·cm⁻ 2 at 700 °C, and displays exceptional operation stability in both EC and FC modes. This work offers valuable insights for rational design of advanced PCEC air electrodes. Download: Download high-res image (209KB) Download: Download full-size image
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DOI
高影响因子
RSC Advances
·
2013
·Vol. 3
·期 48
·26367-26375
·
IF 2.562
Lining Sun,Yannan Qiu,Tao Liu,Hongshang Peng,Wei Deng,Zhijuan Wang,Liyi Shi
The homogeneously transparent hybrid gels (Ln–N–P-gel, Ln = Sm, Yb, Nd, Er, Pr, Ho, Tm) containing lanthanide complexes (by using dinaphthoylmethane (dnm) as the primary ligand and 1,10-phenanthroline (phen) as the synergic ligand) via the in situ approach have been prepared. The dnm ligand was synthesized and adopted with the aim to sensitize the lanthanide ions with visible light. The properties of Ln–N–P-gels were investigated by Fourier-transform infrared (FT-IR), diffuse reflectance (DR), scanning electron micrographs (SEM), fluorescence spectra and thermogravimetric analyses. The results reveal that the lanthanide complexes are successfully in situ synthesized in the corresponding Ln–N–P-gels. Under the excitation of visible-light, the Ln–N–P-gels showed the respective visible (Sm3+) and near-infrared (Sm3+, Yb3+, Nd3+, Er3+, Pr3+, Ho3+, Tm3+) luminescence. The near-infrared (NIR) luminescence of Sm3+, Pr3+, Ho3+, and Tm3+ complexes sensitized by visible-light had been rarely reported previously, which is highly desired for biomedical and photonics applications. Based on the relevant energy levels, a model was proposed to explain the visible-NIR luminescence of the Ln–N–P-gels based on the visible-light excitation.
研究领域:
材料科学
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光学
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生物医学工程
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DOI
高影响因子
OPTICAL MATERIALS
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2021
·
IF 3.08
Panpan Du,Qi Zhu,Xiaodong Li,Xudong Sun,Byung-Nam Kim,Ji-Guang Li
A series of garnet-type Li 6 CaLa 2(1- x ) Nb 2 O 12 : x RE phosphors (LCLN: x RE, RE = Pr, Sm, Tb and Dy) were prepared via sol-gel processing and subsequent calcination for the first time, with the course of phase evolution and the characteristics of the LCLN host and RE 3+ luminescence being investigated in detail. It was found that ∼900–1000 °C is a suitable temperature for precursor calcination to produce the garnet phase and LCLN has a relatively low phonon energy (∼725 cm −1 ) and a relatively wide bandgap (∼4.53 eV) for luminescence. The LCLN:0.012Pr, LCLN:0.04Sm, LCLN:0.06 Tb and LCLN:0.06Dy typical phosphors were analyzed to have dominant excitation/emission bands at ∼278/489, 265/614, 268/549 and 264/581 nm, emission colors of white, orange, green and yellowish white, and fluorescence lifetimes of ∼0.43, 0.74, 0.90 and 0.44 ms, respectively. Temperature-dependent photoluminescence found that the four phosphors maintained ∼28, 37, 45 and 56% of their room-temperature intensities at 423 K, with activation energies for thermal quenching of ∼0.37, 0.29, 0.34 and 0.25 eV, respectively. The results demonstrated that the Li-stuffed LCLN garnet could be a suitable host for UV excitable multicolor phosphors.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2022
·
IF 5.479
Lu Xing,Xifei Ma,Kaibo Hu,Hanmeng Yuan,Jia Wei,Hongshuai Gao,Yi Nie
Since neodymium (Nd) has similar physicochemical properties to lanthanum (La), cerium (Ce) and praseodymium (Pr), their efficient separation and purification is very difficult. Three new phosphate-based ionic liquids (ILs): N,N-dimethyloctylamine bis(2-ethylhexyl)phosphate ([N 1,1,8,H ][DEHP]), N,N-dimethyldecylamine bis(2-ethylhexyl)phosphate ([N 1,1,10,H ][DEHP]), N,N-dimethyldodecylamine bis(2-ethylhexyl)phosphate ([N 1,1,12,H ][DEHP]) were synthesized and evaluated for selective separation of Nd(III) from aqueous solution. The influences concentration of Nd(III), phase volume ratio (O/A), cation chain length of ILs, extraction time, extraction temperature, salt concentration, solution acidity have on the performance of ILs for extraction separation of Nd(III) from aqueous solution were systematically investigated. It was found that the extraction efficiency ( E ) of Nd(III) using [N 1,1,8,H ][DEHP] was close to 100% at pH of 4, and that it only required 10 min to reach extraction equilibrium at 303 K. Meanwhile, the separation factors ( β ) values of β Nd/La , β Nd/Ce , β Nd/pr using [N 1,1,8,H ][DEHP] were all higher than 3. The density functional theory (DFT) results indicated that the interaction between [N 1,1,8,H ][DEHP] and Nd were stronger than that between La , Ce and Pr . In addition, almost 100% of Nd(III) could be recycled from the loaded [N 1,1,8,H ][DEHP] phase using 0.16 mol·L −1 hydrochloric acid via one step, and the E of Nd(III) by regenerated [N 1,1,8,H ][DEHP] remained about 97% after eight cycles. Moreover, the extraction mechanism of Nd(III) using [N 1,1,8,H ][DEHP] was complexation mechanism based on infrared spectroscopy and slope analysis. This work furnishes a strategy for selective separation of Nd(III) using phosphate-based ILs without diluent.
研究领域:
化学
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材料科学
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环境科学
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理论化学
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产品关联
DOI
高影响因子
Advanced Energy and Sustainability Research
·
2023
·Vol. 4
·期 9
·2300023
·
IF 5.8
Shuai Zhang,Mingzi Sun,Leilei Yin,Siyuan Wang,Bolong Huang,Yaping Du,Chun-Hua Yan
The oxygen evolution reaction (OER) is critical for renewable energy conversion and storage devices. However, the rational design of electrocatalysts with suitably high efficiency and stability in strongly acidic electrolytes remains a major challenge. Herein, a solid-phase synthesis strategy is developed for the preparation of Ir-Ln (Ln = La, Ce, Pr, Nd) alloy nanoparticles with uniform particle size on carbon supports as superior acidic OER catalysts. Tailoring by the rare earth (RE) elements, Ir 2 Pr achieves a maximum mass activity of 2.10 A mg −1 Ir at 300 mV overpotential and stability over 200 h at 10 mA cm −2 in 0.5 m H 2 SO 4 , which is 9.5 and 20 times higher to pure Ir nanoparticles. Furthermore, Ir 2 Pr alloy nanoparticles exhibit excellent durability in strongly acidic electrolytes. Theoretical calculations have confirmed that the OER performances are strongly related to the RE elements in the alloy, where the d-band centers show a consistent trend with the overpotential. Moreover, the highest electroactivity of Ir 2 Pr is attributed to the improved electron transfer by 4 f orbitals and the suitable binding strength of intermediates. Herein, a fundamental understanding of the lanthanide–electrochemical performance relationship is provided and will also inspire the rational design of efficient nanoscale RE alloy electrocatalysts.
研究领域:
材料科学
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电化学
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能源转换与存储
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产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2022
·
IF 5.479
Wenjie Zhang,Yunpeng Du,Xiong Tong,Xian Xie,Dongxia Feng,Qiang Song
As the most important method for the separation and purification of rare earth elements, solvent extraction is widely used in industry. HDEHP (Di(2-ethylhexyl) phosphoric acid) has become the most commonly used organic extractant because of its high separation factor for rare earth elements and large processing capacity. However, the large amount of ammonia nitrogen wastewater generated during the extraction process creates huge pressure on the environment. The tartaric acid complexing agent has been added to the aqueous phase to improve the extraction performance of HDEHP without saponification. This can effectively avoid the generation of ammonia nitrogen wastewater, which is more in line with the concept of green production. In this study, the effect of tartaric acid on the separation of Pr and Nd by HDEHP in hydrochloric acid and the corresponding mechanism are investigated. This study showed that the addition of tartaric acid could significantly increase the separation coefficient of HDEHP for Pr and Nd. When the tartaric acid concentration was 0.4 mol/L and the solution pH was 2.5, the separation coefficient reached β Nd/Pr = 1.85, which was higher than the separation coefficient of HDEHP for Pr and Nd in the saponification system. Combining Fourier-transform infrared spectroscopy, nuclear magnetic spectroscopy other analysis and detection methods, and in-depth exploration of the extraction mechanism, the final extraction of the compound structures was determined.
研究领域:
化学工程
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环境科学
·
稀土分离技术
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产品关联
DOI
高影响因子
Journal of Materiomics
·
2023
·
IF 9.4
Fangze Chen,Dacheng Zhou,Xueqing Xiong,Juntao Pan,Donglin Cai,Ze Wei,Xiyong Chen,Yihui Liu,Nengneng Luo,Jialin Yan,Toyohisa Fujita
A series of single-phase double perovskite Pr 1- x Gd x BaCo 2- y Fe y O 5+ δ ( x = 0, 0.5 and 1, 0 ≤ y ≤ 1) materials were engineered through A/B site co-doping strategy to improve the mechanical, electrical and electrochemical properties as potential cathode materials for the application of intermediate solid oxide fuel cells (IT-SOFCs). The corresponding thermochemical stability, thermal expansion behavior, electrical conductivity and cathodic polarization resistance of the materials were systematically investigated. It was found that the A-site dual lanthanide doped Pr 0.5 Gd 0.5 BaCo 2 O 5+ δ (PGBCO) exhibits improved electrical conductivity, reduced thermal expansion, and comparatively low electrochemical polarization resistance versus single lanthanide double perovskite, PrBaCo 2 O 5+ δ (PBCO) and GdBaCo 2 O 5+ δ (GBCO) materials. Further investigation on the effect of B-site Fe-doping on Pr 0.5 Gd 0.5 BaCo 2- y Fe y O 5+ δ (PGBCF- y , 0 ≤ y ≤ 1) reveals that all the PGBCF- y compositions exhibit excellent chemical stability with Gd-doped ceria (GDC) at operating temperatures not higher than 1 100 °C. Besides, doping of Fe in B-site can effectively reduce the thermal expansion coefficients (TECs) of the Pr 0.5 Gd 0.5 BaCo 2 O 5+ δ ceramics at 30–1 000 °C. And the electrochemical impedance spectra (EIS) results show that the PGBCF- y |GDC| PGBCF- y symmetric cells have acceptable low area specific polarization resistances. Further examination of the cathodic polarization and characteristic capacitance from the AC impedance spectra by employing the relaxation time distribution (DRT) method demonstrated that charge transfer is the dominating sub-process for the oxygen transport through the materials.
研究领域:
材料科学
·
燃料电池研究
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产品关联
DOI
高影响因子
Plants-Basel
·
2023
·Vol. 12
·期 10
·1992
·
IF 4.5
Yongyao Fu,Liling Shu,Hanyi Li,Xingming Zhang,Xuan Liu,Zhengying Ou,Xiaomeng Liang,Xiangying Qi,Liping Yang
Lilium browniivar.viridulum, commonly called Longya lily, is a well-known flower and vegetable plant in China that has poor tolerance toBotrytisfungal disease. The molecularimprovement has mainly been restricted to an efficient regeneration and transformation system. In this study, the highly efficient regeneration of Longya lily was established through the optimization of embryogenic callus, adventitious shoot and rooting induction. The major factors influencing transformation (antibiotics,Agrobacteriumconcentration, infection time, suspension solution and coculture medium) were examined. The expression responses of PR promoters (ZmPR4andBjCHI1) toB. cinereawere assessed in transgenic calli. The results showed that Murashige and Skoog (MS) medium with 1.0 mg·L−1picloram (PIC) and 0.2 mg·L−11-naphthaleneacetic acid (NAA) under light conditions and MS with 0.5 mg·L−16-benzylaminopurine (6-BA) and 1.0 mg·L−1NAA under darkness were optimal for embryogenic callus induction (64.67% rate) and proliferation (3.96 coefficient). Callus inoculation into MS containing 2.0 mg·L−1thidiazuron (TDZ), 0.4 mg·L−1NAA, 1.0 mg·L−1TDZ and 0.5 mg·L−1NAA led to shooting induction (92.22 of rate) and proliferation (3.28 of coefficient) promotion, respectively. The rooting rate reached 99.00% on MS with 0.3 mg·L−1NAA. Moreover, a transformation rate of 65.56% was achieved by soaking the callus inAgrobacteriumat an OD600of 0.4 for 10 min in modified MS without NH4NO3as the suspension solution and coculture medium before selecting 75 mg·L−1hygromycin and 300 mg·L−1cefotaxime. Only theBjCHI1promoter was obviously expressed in transgenic calli. These results could facilitate the generation of Longya lily transgenic plants with improvedB. cinerearesistance.Keywords:Lilium browniivar.viridulum;plant regeneration;callus;genetic transformation;Botrytis cinerea
研究领域:
植物学
·
遗传学
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植物病理学
·
分子生物学
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Hao Li,Zonglian Huang,Lijin Cheng,Shu Kong,Shaojun Liu
Novel monoclinic Bi 2 O 3 -xRE 2 O 3 -yMoO 3 (RE=Pr, Nd, Sm, and Yb) based low temperature co-fired ceramics (LTCC) systems with high sintering density and low microwave dielectric loss are synthesized by conventional solid state reaction technique. The structure and dielectric properties of Bi 2 O 3 -xRE 2 O 3 -yMoO 3 ceramics are investigated. Dense BiNdMoO 6 ceramics sintered at 900 °C for 8 h in air have a low dielectric constant ε r =~7.5, a high quality factor Q × f =~ 24, 800 GHz at 7.0 GHz, and τ f =~−16 ppm/̊C. Especially, good chemical compatibility of BiNdMoO 6 with Ag electrodes is represented as well. In contrast, BiSmMoO 6 ceramics sintered at 1000 °C for 8 h show enhanced Q×f =~43, 700 GHz at 7.8 GHz with ε r = ~8.5 and τ f = ~−27 ppm/°C. Bi 2 O 3 -xRE 2 O 3 -yMoO 3 (RE=Pr, Nd, Sm, and Yb) based ceramics could be considered as promising microwave ceramics for LTCC applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）