OPTICAL MATERIALS
·
2026
·
IF 4.2
Gulizhabaier Abulipizi,Leping Ding,Juanjuan Zhou,Xiao Ma,Chaomin Qu,Ziang Zong,Yawen Zheng,Huai Chen,Zhanjun Li
Persistent luminescence (PersL) materials have unique long-term separable excitation-emission properties. In this study, intrinsic near-infrared (NIR) PersL of Ti 3+ is found at 760 nm in undoped Na 0·5 Y 0·5 TiO 3 (NYT) after being illuminated to room light or red LED illumination. The low symmetric monoclinic perovskite structure of NYT leads to energy level splitting of Ti 3+ into 2 E 1/2 and 1 E 2/2 , which generates a new PersL excitation peak at ∼650 nm. Direct electron transfer from excited Ti 3+ to oxygen vacancy is verified during the PersL charging process by X-ray photoelectron spectroscopy which avoids cross-band transition. Further, double band visible/NIR PersL is realized by introducing Pr 3+ into NYT (Na 0·5 Y 0·5 TiO 3 :Pr, NYT-Pr) at 614 and 760 nm, respectively. By observing the anti-Stokes PersL of Pr in NYT-Pr at 614 nm that is rechargeable at 660 nm, a phonon-assisted charging mechanism is proposed, in which Ti 3+ absorbs excitation and phonon energy to realize electron transfer to oxygen vacancy ( V O ). Based on single band PersL NYT and double band PersL NYT-Pr, triple modal optical information encryption was realized by applying their visible fluorescence/visible PersL/invisible NIR PersL properties, showing different levels of optical information. NYT-Pr integrates traditional visible PersL by naked eyes and invisible NIR PersL imaged by CCD camera together, and will find promising applications in modern optics and bio-optics.
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ELECTROCHIMICA ACTA
·
2026
·
IF 5.6
Yuanyuan Liao,Jieran Xie,Lei Sun,Zongyi Huang,Jing Li,Feng Liu,Yongxiu Li
Oxygen evolution reaction (OER) is a critical challenge in electrochemical water splitting, necessitating the development of efficient catalysts. In this study, a room-temperature gas–liquid diffusion strategy is presented to synthesize rare earth-doped NiCo₂O₄ nanosheets on carbon paper (RE-NiCo₂O₄/CP, RE = La, Ce, Pr, Gd) as alkaline OER electrocatalysts. Among them, Ce-NiCo₂O₄/CP demonstrates catalytic activity, requiring an overpotential of only 265 mV to achieve a current density of 20 mA cm⁻² in 1 M KOH, which is lower than that of undoped NiCo₂O₄/CP (348 mV). Comprehensive characterization reveals that RE doping modulates the electronic structure of NiCo₂O₄, increasing the Co 3+ /Co 2+ ratio and optimizing intermediate adsorption. Notably, Ce doping facilitates the formation of highly active Ni(Co)OOH species during OER, further enhancing catalytic performance. Combination experiments and in-situ analysis confirmed that the increase in activity was due to the incorporation of rare earths, which enhanced the charge transfer of reaction intermediates and promoted the formation of highly active phases. This work not only presents a synthesis method for high-performance OER catalysts, but also elucidates the electronic modulation effect into the role of rare-earth elements in tuning electrocatalytic properties.
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JOURNAL OF RARE EARTHS
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2026
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IF 9.6
Zhengyang Chi,Yonghong Niu,Lin Ma,Yuan Tian,Hao Li
The global transition toward low carbon energy systems has intensified the demand for renewable H 2 and cleaner syngas production. Biomass steam gasification is a promising route, but tar formation and catalyst deactivation still limit its practical application. Herein, Pr 1– x Ce x FeO 3 supported on calcined dolomite was developed for staged biomass steam gasification to couple H 2 production with tar reforming. Statistical screening identifies gasification temperature, Ce substitution level, and steam flow rate as the dominant factors controlling H 2 formation. Under single-factor conditions, Pr 0.6 Ce 0.4 FeO 3 /CD shows the best performance, giving 44.33 vol% H 2 , a total gas yield of 1.51 Nm 3 /kg biomass, a syngas yield of 1.10 Nm 3 /kg biomass, and a syngas fraction of 72.77 vol%. Tar conversion is optimal near 850 °C, where the dry tar yield decreases to 22.75 g/kg biomass, while heavy polycyclic aromatics and >C13 compounds account for 0.79% and 4.14% of the total gas chromatography-mass spectrometry (GC-MS) peak area, respectively. Response surface optimization gives an optimum at 810 °C, x = 0.4, and a steam flow rate of 1.2 mL/min, with an experimental H 2 fraction of 46.22 vol%. Structural and surface analyses indicate that moderate Ce substitution preserves the perovskite framework while regulating defect formation, surface oxygen species, and Fe/Ce/Pr redox behavior. Cycling deactivation is mainly associated with carbonaceous deposits, Fe migration, CaO carbonation, and structural densification. This work provides a feasible perovskite dolomite strategy for integrated tar reforming and production of syngas rich in H 2 from biomass.
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Metals
·
2021
·Vol. 11
·期 2
·294
·
IF 2.351
Chunlin He,Khalid A.M. Salih,Yuezhou Wei,Hamed Mira,Adel A.-H. Abdel-Rahman,Khalid Z. Elwakeel,Mohammed F. Hamza,Eric Guibal
With the target of recovering rare earth elements (REEs) from acidic leachates, a new functionalized hydrogel was designed, based on the phosphorylation of algal/polyethyleneimine beads. The functionalization strongly increased the sorption efficiency of the raw material for Pr(III) and Tm(III). Diverse techniques were used for characterizing this new material and correlating the sorption performances and mechanisms to the physicochemical structure of the sorbent. First, the work characterized the sorption properties from synthetic solutions with the usual procedures (study of pH effect, uptake kinetics, sorption isotherms, metal desorption and sorbent recycling, and selectivity from multi-element solutions). Optimum pH was found close to 5; sorption isotherms were fitted by the Langmuir equation (maximum sorption capacities close to 2.14 mmol Pr g−1and 1.57 mmol Tm g−1). Fast uptake kinetics were modeled by the pseudo-second order rate equation. The sorbent was highly selective for REEs against alkali-earth and base metals. The sorbent was remarkably stable for sorption and desorption operation (using 0.2 M HCl/0.5 M CaCl2solutions). The sorbent was successfully applied to the leachates of Egyptian ore (pug leaching) after a series of pre-treatments (precipitation steps), sorption, and elution. The selective precipitation of REEs using oxalic acid allows for the recovery of a pure REE precipitate.Keywords:rare earth elements;sorption isotherms;uptake kinetics;functionalization of bio-based sorbent;metal desorption;sorbent recycling;treatment of ore leachate
研究领域:
环境科学
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材料科学
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HYDROMETALLURGY
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2019
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IF 3.465
Pan Sun,Kun Huang,Huizhou Liu
Separation of adjacent rare-earth elements, such as Pr and Nd, is extremely difficult due to the similarity in their physicochemical properties . Enhanced separation of adjacent rare-earth elements based on the “push-pull effect” by addition of water-soluble complexing agents was an effective strategy in traditional organic-aqueous two-phase extraction. However, environmental pollution is serious due to the residual of complexing agent in the extraction raffinates. In present work, a novel “external push-pull” extraction system, composed of three coexisting liquid phases, P507 organic phase, ionic liquid (tributyl-methyl ammonium nitrate , N 4441 NO 3 )-rich phase and NaNO 3 aqueous solutions, is suggested to improve the separation between Pr and Nd. It is revealed that Nd and Pr can be enriched respectively into the P507 organic top phase and N 4441 NO 3 -rich ionic liquid middle phase in the external push-pull extraction system, owing to a so-called “external push-pull effect” from a reversed extraction selectivity of P507 organic phase and N 4441 NO 3 ionic liquid-rich phase towards Nd and Pr, respectively. Compared to traditional organic-water two-phase systems, the separation factor of Pr to Nd in the suggested external push-pull extraction system could increase obviously to 3.5 or even more. Various effects from the aqueous pH, NaNO 3 concentration, the initial concentration ratios of Pr to Nd in feed aqueous solutions, and the addition amount of N 4441 NO 3 , the volume of P507 organic phase on the separation between Pr and Nd are discussed. In addition, reversal extraction of rare earth ions in the ionic liquid-rich phase is found to be closely related to the complexation behavior of rare earth ions with NO 3 − ions by using molecular dynamic simulations. Based on this work, a possibility for extraction and separation of 14 rare-earth element ions from their coexisting aqueous solutions using the suggested external push-pull extraction system is also explored. The present work highlights a novel green strategy for improving the separation of adjacent rare-earth elements.
研究领域:
化学工程
·
稀土分离技术
·
绿色化学
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DALTON TRANSACTIONS
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2026
·
IF 3.3
Yun Lv,Yanhong Wang,Nian Shi,Keke Huang,Jinkui Tang,Hongcheng Lu
The synthesis of novel two-dimensional (2D) triangular frustrated compounds are important for providing various platforms to investigate exotic quantum magnetism. Here, we successfully synthesised a series of RE-based magnetic compounds Ba3BiPbREO(BO3)4 (RE = Pr, Nd, Gd, Dy) with a geometrically-perfect 2D triangular lattice directed by triangular BO3 unit. These compounds stabilise 2D layered structures in the hexagonal (P63/mmc) crystal system, where magnetic ions are linked by BO3 to form a perfect triangular frustrated lattice. The magnetisation susceptibility results show that all synthesised compounds Ba3BiPbREO(BO3)4 exhibit dominant antiferromagnetic (AFM) interactions, with no long-range order (LRO) down to 2 K, which is further confirmed by specific heat measurements. Additionally, their thermal stability, attenuated total reflectance Fourier-transform infrared (ATR-FTIR) and Ultraviolet−visible-near-infrared (UV−Vis−NIR) diffuse reflectance spectra are also reported. This work provides a series of RE-based magnetic compounds with a two-dimensional triangular frustrated lattice, offering novel model materials for further investigation on rare-earth-based frustrated magnetism.
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PubMed
高影响因子
INORGANICA CHIMICA ACTA
·
2024
·
IF 2.7
Qiang Zhao,Su-Juan Jin,Zhi Shen,Guo Zang,Wen-Jun Lv
In order to further enrich the research on the synthesis of complexes with polycarboxylic acid ligands and rare earth metal ion. In this study, four rare earth complexes, namely, [Gd(cpia)] n ( 1 ), [Er(cpia)] n ( 2 ), [Pr(cpna) 2 ·2H 2 O] n ( 3 ) and [Gd(Hcpna)(cpna)•3H 2 O] n ( 4 ) have been synthesized by solvothermal method based on 5-(2-carboxyphenoxy)isophthalic acid (H 3 cpia) and 5-(4-carboxyphenoxy)nicotinic acid ligand (H 2 cpna) with rare earth metal ions Pr 3+ , Gd 3+ and Er 3+ . Single crystal X-ray diffraction analyses reveal that complexes 1 , 2 and 3 are two-dimensional network structure, 4 is one-dimensional chain structures. The fluorescence test results show that the fluorescence intensity of complexes 1 and 2 were lower than that of the H 3 cpia ligand, the fluorescence intensity of complexes 3 and 4 were lower than that of the H 2 cpna ligand. Magnetic results indicate complex 1 has ferromagentic behavior and weak antiferromagentic behavior in the complexes 2, 3 and 4 .
研究领域:
化学
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材料科学
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NEW JOURNAL OF CHEMISTRY
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2026
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IF 2.6
Jiming Wang,Min Ji,Min Wang
The integration of photocatalysis and thermal catalysis offers a sustainable route to drive the dry reforming of methane (DRM) at low temperatures, addressing the high energy consumption of traditional thermocatalytic processes. Herein, we systematically explore the effects of doping rare earth elements (Ce, Pr, and Y) on the photothermal catalytic activity and stability of Ni-based catalysts (Ni–MOx–Al2O3) for DRM. Results demonstrate that Ce doping significantly enhances charge carrier separation efficiency and reduces interfacial impedance, endowing Ni–Ce–Al with superior photocatalytic activity compared to Ni–Pr–Al and Ni–Y–Al catalysts. After 100 h of continuous reaction at 650 °C, the conversions of CH4 and CO2 only decrease from 59.0% and 62.0% to 52.6% and 56.8%, respectively. Mechanistic studies reveal that Ce incorporation increases the density of surface oxygen vacancies, which promotes the activation of CH4 and CO2 and enhances coke resistance under light conditions. Kinetic analysis confirms that Ni–Ce–Al possesses the lowest activation energies for CH4 (40.6 kJ mol−1) and CO2 (36.7 kJ mol−1) dissociation under illumination. This work provides helpful guidance for the design of high-performance Ni-based photothermal catalysts for DRM through rare earth modification, highlighting the crucial role of Ce in optimizing electronic properties and anti-coking ability.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2024
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IF 5.8
Bin Zhang,Ya’nan Li,Shuai Lu,Jonathan Richard Ishengoma,Song Wang,Jie Liu,Tao Tang,Sanxi Li
Plastic waste causes serious pollution to the environment. Being not satisfied with simply disposing of them into environment, people want to efficiently convert it into high-value products, such as H 2 and carbon nanotubes . A trimetallic catalyst is provided herein, which adds Pr, Ce, La or Yb to a Co-Fe bimetallic catalyst to inhibit the formation of oil by-product in a plastic pyrolysis reaction. In this work,various plastics，including plastics with different functional groups and real plastic waste were used for pyrolysis with elemental hydrogen efficiencies above 95% in the gas product. For pyrolysis of EVA, the gaseous hydrogen efficiency reached 96.07%, and for pyrolysis of LLDPE , the gaseous hydrogen efficiency reached 95.56%, over Pr 1 Co 1 Fe 8 O x catalyst. The role of Pr in catalytic reactions is discussed in general and the formation of carbon nanotubes of various types of structures is simulated. Catalyst cycling experiments demonstrate that the catalyst still maintains a gas hydrogen efficiency of more than 70% after being used four times. In conclusion, the Pr 1 Co 1 Fe 8 O x catalyst proved to be the best choice for microwave-assisted catalytic pyrolysis of plastics to H 2 , and this work provides a new perspect for the study of plastic pyrolysis.
研究领域:
环境科学
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材料科学
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化学工程
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INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Yue Jiang,Xiaolan Ji,Yueyang Zhang,Xiaoyu Pan,Yizhou Yang,Yiming Li,Wenhui Guo,Yong Wang,Zhiqing Ma,Bin Lei,He Yan,Xili Liu
Litsea cubeba essential oil (LCO) has a wide range of industrial uses. This study found that LCO has significant anti-TMV activity and that its active components are monoterpenoids. Citral , the main active component of the oil, showed outstanding anti-TMV activity. The protective, inactive, and curative efficacies of citral (500 μg/mL) against TMV were 76.27%, 55.14%, and 50.42%, respectively, which were significantly better than those of the positive control agent, chitosan oligosaccharide . Citral showed no direct effect on TMV particles but did induce hypersensitive response (HR). Bioassay results showed that citral induced significant plant disease resistance activity (68.20% at a concentration of 500 μg/mL). The results of physiological and biochemical experiments showed that citral induced the overexpression of defense enzymes such as SOD , CAT , POD , and PAL in tobacco (which increased by 5.3, 1.9, 3.0, and 4.0 times at a concentration of 500 μg/mL, respectively) as well as induced the overexpression of PR proteins, including NPR1 , PR1 , PR2 , and PR5 (which increased by 23.49, 39.27, 34.47, and 52.07 times at a concentration of 500 μg/mL, respectively). These results suggest that citral could induce systemic acquired resistance (SAR) in tobacco. Further mechanism studies conducted suggest that citral induces the overexpression of genes related to salicylic acid (SA) biosynthesis, including PAL , ICS , and PBS3 (50.74, 30.41, and 31.95 times higher than the control at a concentration of 500 μg/mL, respectively) and the accumulation of SA (5.1 times higher than the control at a concentration of 500 μg/mL). These results suggest that citral activates SAR through the SA pathway. The control efficacies induced by citral (500 μg/mL) on Erysiphe cucurbitacearum , Botrytis cinerea , and Sclerotinia sclerotiorum reached 67.39%, 59.61%, and 63.81%, respectively, indicating that citral can induce plant resistance against fungal diseases. The induced plant disease resistance activity of citral is prominent, with a long duration and a broad spectrum, performing better than the commercial agent chitosan oligosaccharide. Citral thus has the potential to be developed into a new botanical-derived anti-virus agent and plant immunity activator.
研究领域:
植物病理学
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植物化学
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分子生物学
·
农业科学
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高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Yuan Zhong,Shujie Gai,Yimei Yang,Mao Xia,Ye Zhang,Fanshan Qiu,Fang Xiang,Zhi Zhou
Green phosphor is an essential component in phosphor-converted white light-emitting diodes (pc-LEDs). Herein, a novel green-emitting phosphate phosphor Sr 8 ZnY(PO 4 ) 7 :Eu 2+ (SZYP:Eu 2+ ) was synthesized through hydrothermal reaction method. The crystal structure, photoluminescence properties as well as thermal stability of SZYP:Eu 2+ were investigated systematically. SZYP:Eu 2+ can be efficiently excited by n-UV light in the range from 220 to 550 nm and shows a broad emission band centered at 520 nm with a full width at half maximum of 86 nm. The optimized doping concentration of Eu 2+ was determined to be 0.02 mol. With the increase of Eu 2+ content, a subtle red shift about 4 nm in emission spectra was detected. SZYP:Eu 2+ also shows comparable thermal stability (45% at 150 °C) and it can be further varied to 44, 40 and 51% by co-doping with Pr 3+ , Tm 3+ and Yb 3+ , respectively. The white LED device blended with SZYP:Eu 2+ shows excellent electroluminescence (EL) properties. The low correlated color temperature (4791 K) and ultrahigh color rendering index (95.8) imply that this phosphor may find a potential application in high-quality white LEDs.
研究领域:
材料科学
·
光学工程
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International Journal of Minerals Metallurgy and Materials
·
2024
·Vol. 31
·期 7
·1651-1658
·
IF 5.6
Zhang Peixiong,Wang Enhui,Liu Jingjing,Yang Tao,Wang Hailong,Hou Xinmei
Thermal insulation materials play an increasingly important role in protecting mechanical parts functioning at high temperatures. In this study, a new porous high-entropy (La 1/6 Ce 1/6 Pr 1/6 Sm 1/6 Eu 1/6 Gd 1/6 )PO 4 (HE (6RE 1/6 )PO 4 ) ceramics was prepared by combining the high-entropy method with the pore-forming agent method and the effect of different starch contents (0–60vol%) on this ceramic properties was systematically investigated. The results show that the porous HE (6RE 1/6 )PO 4 ceramics with 60vol% starch exhibit the lowest thermal conductivity of 0.061 W·m −1 ·K −1 at room temperature and good pore structure stability with a linear shrinkage of approximately 1.67%. Moreover, the effect of large regular spherical pores (>10 µm) on its thermal insulation performance was discussed, and an optimal thermal conductivity prediction model was screened. The superior properties of the prepared porous HE (6RE 1/6 )PO 4 ceramics allow them to be promising insulation materials in the future.
研究领域:
材料科学
·
热能工程
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高影响因子
危险品化学品经营许可证（带存储）