ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Haowei Li,Xinlai Zheng,Huimin Zhang,Xuehui Li,Jinxing Long
Novel strategies for converting renewable lignin to bulk petrochemicals are highly desirable for achieving sustainable practices in the age of environmental awareness. Herein, we propose an efficient approach for the selective hydrogenolysis of lignin promoted by a cost-effective La3+-doped Ni/MgO catalyst. The results reveal that 84.44% lignin is converted at 270 °C for 4 h, yielding 16.50% volatile products. Importantly, approximately 43.45% of these volatile products are identified as 4-ethyl phenol (7.17% yield), an important intermediate in the fine chemical industry. Intensive analysis of the lignin before and after the reaction confirms that efficient cleavage of the ester linkages is achieved, which correlates directly with the high selectivity of 4-ethyl phenol after a readily decarboxylation reaction. Furthermore, the catalyst characterization demonstrates that La3+ suppresses the formation of a NiMgOx solid solution. Consequently, a greater degree of Ni2+ becomes reducible and the catalyst basicity becomes stronger, both of which are essential for the efficient lignin depolymerization and char reduction. As a result, a significant increase of the yield of volatile products is shown along with a substantial inhibition of biochar formation over the La-doped Ni/MgO catalyst in comparison with that without La doping. Therefore, the present work provides a new insight on producing fine chemicals via a sustainable route.
研究领域:
化学工程
·
可再生资源转化
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DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Lin Fan,Ce Li,Tao Peng,Miao Yan,Xiaoqing Pei,Yifan Liu,Weiling Yang,Shasha Li,Hai Lin,Chun Li,Lina Liu,Xuechao Yu,Fanming Zeng
Phosphor-converted white light-emitting diodes (w-LEDs) have become indispensable for modern lighting and display technologies. However, the development of efficient and thermally robust white phosphors remains a persistent challenge. Here, we report a series of Sr 3 Y 2 Ge 3 O 12 : Dy 3+ garnet-based phosphors that exhibit dual emissions at 480 and 580 nm, enabling cool-white light generation. Co-doping with La 3+ effectively lowers the crystal symmetry and narrows the band gap from 4.67 to 4.56 eV, which enhances the radiative transitions of Dy 3+ . As a result, the emission intensities at 480 and 580 nm bands are boosted by factors of 2.21 and 1.91, respectively. The spectral modification drives a chromaticity shift from cool to warm white light, with correlated color temperature decreasing from 4703 K to 2927 K. Moreover, the modified phosphors exhibit excellent thermal stability (92.51 % at 150 °C) while maintaining high internal quantum efficiency (29.43 %). When integrated with 365 nm excitation chips, the phosphors enable the fabrication of w-LEDs with tunable color temperatures. These findings offer a promising pathway for the design of next-generation high-performance warm w-LEDs.
研究领域:
材料科学
·
发光材料
·
半导体照明
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固态物理
·
无机化学
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DOI
高影响因子
MINERALS ENGINEERING
·
2022
·
IF 5.479
Fang Zhou,YiXin Zhang,Qi Liu,Suhua Huang,Xiaoyan Wu,Zhiwei Wang,Lisen Zhang,Ruan Chi
Weathered crust elution-deposited rare earth ores tailings are mainly composed of clay minerals, which can be used as efficient adsorption materials. In order to explore the possibility of recovering rare earth ions using tailings from mine waste liquid, the weathered crust elution-deposited rare earth ores tailings were modified to adsorb La 3+ and Y 3+ with respect to initial concentrations of La 3+ and Y 3+ , temperatures and impurity ions, and the adsorption kinetics and thermodynamics were further discussed to analyze the adsorption behavior. The results show a higher adsorption capacity of heavy rare earth Y 3+ than that of light rare earth La 3+ . The presence of impurity ions does not adversely affect adsorption of rare earth ions by the modified tailings. The adsorption performance is well fitted with the Langmuir adsorption isotherm model rather than the Freundlich adsorption isotherm model, and the maximum adsorption capacity is 0.0226 mmol/g and 0.0197 mmol/g for Y 3+ and La 3+ , respectively. Pseudo-first-order, pseudo-second-order, intraparticle diffusion and Elovich model were applied to fit the adsorption results. The results show that the adsorption process of modified tailings for La 3+ and Y 3+ is more in line with the pseudo-second-order kinetic model, suggesting the dominated chemical adsorption. The adsorption activation energies of La 3+ and Y 3+ on modified tailings are 11.60 KJ/mol and 7.60 KJ/mol, respectively. Thermodynamic studies show that the adsorption process of modified tailings for La 3+ and Y 3+ is a spontaneous endothermic reaction in the experimental temperature range. The recovery of rare earth ions form the modified tailings can be carried out by the leaching solution of weathered crust elution-deposited rare earth ores, 0.2 mol/L (NH 4 ) 2 SO 4 solution. In addition, the modified tailings are reversible and keep functionality to reuse in several cycles after elution process.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2025
·
IF 3.2
Chunying Chen,Jinjun Ren,Qing Jiao,Jingping Tang,Lili Hu
Joint doping with trivalent and monovalent ions is a widely adopted strategy to enhance the ionic conductivities of NASICON-type solid-state electrolytes (SSEs) with the general formula Na1+xZr2SixP3–xO12, but the underlying microscopic mechanism remains unclear. In this study, we synthesized a series of Na3+xLaxZr2–xSi2PO12 (NLZSPx, 0 ≤ x ≤ 0.4) ceramics and characterized their electrical properties and structures by using electrochemical impedance spectroscopy (EIS), X-ray diffraction (XRD), scanning electron microscopy (SEM), and advanced solid-state nuclear magnetic resonance (SSNMR). Among all of the samples, the composition with x = 0.2 exhibited the highest ionic conductivity, achieving 1.05 × 10–3 S/cm at 25 °C, which is 3.65 times higher than that of the undoped sample. XRD and SSNMR results prove that La3+ ions did not integrate into the main phase lattice to replace Zr4+ ions. Instead, they formed a heterogeneous phase predominantly composed of Na3La(PO4)2 at the grain boundaries. The content of Na3La(PO4)2 and the composition of the NASICON main phase were accurately determined by SSNMR. This impurity resulted in changes in the Si/P and Na/Zr ratios within the main phase. Some comparison experiments are carried out and prove that these changes were not the principal drivers of the increased conductivity. SEM results further indicated that doping with an appropriate amount of La3+ ions significantly increased the sample densification, thus promoting Na+ ions transport between grain boundaries─this being the key factor driving the observed improvement in ionic conductivity.
研究领域:
材料科学
·
固体物理
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DOI
高影响因子
JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Wenhao Li,De-Kun Ma,Xia Hu,Faliang Gou,Xiaogang Yang,Walker MacSwain,ChenZe Qi,Weiwei Zheng
Rationally designing and controlling the interactions between reaction intermediates and the surface of photocatalysts is critical to obtain high product selectivity in photocatalysis. Herein, using CdS-based photocatalytic CO 2 reduction reaction (CO 2 RR) as a model system, we demonstrate that CH 4 selectivity can be significantly enhanced through the introduction of La 3+ ions with high oxophilicity on the surface of the photocatalysts. The high surface oxophilicity of the photocatalysts can increase CO* desorption energy and promote further hydrogenation to CH 4 . In contrast, when Au 3+ ions with low oxophilicity were doped in CdS, reduced CH 4 selectivity was observed in the CO 2 RR. Significantly, enhanced CH 4 selectivity can be achieved by doping oxophilic La 3+ ions into a broad range of alternative photocatalysts including ZnO, SnS 2 , BiOBr, BiVO 4 , TaON, and CsPbBr 3 , which demonstrates the general strategy to enhance CH 4 selectivity of photocatalytic CO 2 RR through increased surface oxophilicity of the photocatalysts by rare earth La 3+ ion doping.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Yuwen Liu,Chengwen Bin,Cheng Sun,Sheng Jiang,Jie Wang
Research on Aurivillius ceramics mainly focuses on perovskite-like slabs, whereas fluorite-like (Bi 2 O 2 ) 2+ layers are often regarded as passive. Here, Ce 3+ /La 3+ -modified CaBi 2 Nb 2 O 9 -based ceramics were designed to clarify how engineering the (Bi 2 O 2 ) 2+ layers affects cross-layer structural coupling and electromechanical response. Ce 3+ /La 3+ incorporation weakens orthorhombic distortion and induces tetragonal-like evolution while maintaining the Aurivillius framework. Raman and XPS results further demonstrate that this modification simultaneously alters the local Bi–O environment, A-site Ca 2+ coordination, NbO 6 octahedral distortion, and defect chemistry, confirming pronounced coupling between the fluorite-like layers and perovskite slabs. In addition, Ce 3+ /La 3+ incorporation suppresses Bi volatilization, improves densification and optimizes the domain morphology. As a result, the ceramic with x = 0.05 exhibits an enhanced piezoelectric coefficient d 33 of 15.9 pC/N while retaining a high Curie temperature of 921 °C. This work demonstrates that targeted engineering of the (Bi 2 O 2 ) 2+ layers is an effective route for regulating cross-layer coupling and improving the performance of high-temperature Aurivillius piezoceramics.
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Shangshu Qian,Haoxiang Yu,Lei Yan,Peng Li,Hua Lan,Haojie Zhu,Nengbing Long,Miao Shui,Jie Shu
High performance Sr 0.95 M 0.05 Li 2 Ti 6 O 14 (M 3+ = Y 3+ , Cr 3+ , La 3+ ) are prepared and evaluated as lithium storage anodes for rechargeable batteries via strontium atoms substituting by heteroatoms . The phase structure and morphology of the as-prepared products are systematically studied by various analytical methods. It demonstrates that Y 3+ , Cr 3+ and La 3+ are successfully introduced into the Sr-site of SrLi 2 Ti 6 O 14 without changing its morphology and size. Galvanostatic discharge/charge tests and rate properties are also investigated between 5.0 and 2.0 V. Contributed to the enhanced electronic conductivity , improved lithium-ion diffusion coefficient and decreased charge-transfer resistance after La 3+ doping, it is found that Sr 0.95 La 0.05 Li 2 Ti 6 O 14 exhibits high reversible capacity and excellent rate capability. It can deliver an initial charge capacity of 159.54 mAh g −1 at 100 mA g −1 with the capacity retention of 94.7% after 100 cycles. Furthermore, it can still deliver an initial capacity of 146.21 mAh g −1 at 700 mA g −1 , with only 8.7% of capacity lost after 1000 cycles. In addition, its structural stability and electrochemical reversibility are also demonstrated by in-situ XRD investigation, with only 2.16% of volume expansion throughout the whole discharge and charge process.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2026
·
IF 3.2
Yubo Wu,Zhijia Zhang,Jun Zhang,Ruirui Cui
A novel double perovskite-structured phosphor Sr 2 Eu 0.2 Gd 0.8-x SbO 6 : x La 3+ (SEGSO: x La 3+ ) was designed and prepared by conventional high-temperature solid-phase reaction. The effects of doping La 3+ on the crystal structure and luminescence properties of Sr 2 Gd 0.8 SbO 6 :0.2Eu 3+ (SEGSO) phosphors were systematically discussed. It is proved that the phosphor lattice becomes larger, the lattice symmetry decreases, and the band gap narrows after La 3+ replaces Gd 3+ , which ultimately significantly enhances the luminescence intensity. Due to the rigid network structure of the double perovskite structure, the SEGSO: 0.8La 3+ phosphor exhibits excellent thermal stability. In comparison to the undoped La 3+ phosphor, it retains 85 % of its initial emission intensity at 423 K. The phosphors were also evaluated for their potential application in LED lighting by applying two encapsulation methods.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Can Zhao,Arif Hussain,Tengyu Li,Junyi Yu,Peng Li,Suibin Luo,Shuhui Yu
Ferroelectric materials with high dielectric tunability are widely investigated to meet the demands of microwave device. Ion doping has proven to be an effective method to enhance the dielectric tunability of ferroelectric ceramics. However, high-temperature processing, rigidity, and high density are the obstacles associated with these ceramic materials which limits their application. In this study, Cr 3+ and La 3+ co-doped Ba 0.675 Sr 0.325 TiO 3 ceramic (BSTLC) is used as filler particles in poly(vinylidene fluoride) (PVDF) matrix to produce flexible composite material. With addition of 12 vol% BSTLC, the dielectric constant ( D k ) of the PVDF composites is 16.7, which is higher by 85.6% and 10.1% compared to pure PVDF and undoped-BST/PVDF composite, respectively. Meanwhile, a high dielectric tunability of 9.1% is achieved, which shows an increase of 105% compared to the BST/PVDF composite (4.4%). The co-doping of Cr 3+ and La 3+ in the BST filler provides an effective strategy for adjusting the dielectric tunability properties of polymer-based composites.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2020
·Vol. 126
·期 3
·1-9
·
IF 1.81
Ding Feng,Lin Jing,Wu Tengyan,Zhong Hongbin
Magnetic nanoparticles were one of the most promising materials for targeted magnetic hyperthermia application due to the excellent magnetic properties. In this work, the magnetic nanoferrite of Mn 0.6 Zn 0.4 La x Fe 2− x O 4 ( x = 0.09, 0.1, 0.15, 0.2, 0.25 and 0.3) was synthesized by the hydrothermal method. Various physical properties of samples have been characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR), transmission electron microscopy and vibrating sample magnetometer. XRD results revealed that the lattice constants a t and crystallite size of the Mn–Zn nanoferrites decreased with increasing La 3+ content. The characteristic absorption bands of spinel nanoferrites and polyethylene glycol were observed in the FTIR spectra. FTIR results indicated that polyethylene glycol was coated on the Mn–Zn nanoferrites successfully. The saturation magnetization ( M S ), magnetic moment ( M r ) and anisotropy constant ( K ) were affected by La 3+ ion content. The M S of Mn 0.6 Zn 0.4 La 0.09 Fe 1.91 O 4 was 58 emu/g, which could be potential hyperthermia in biomedical application.
研究领域:
材料科学
·
医学
·
物理学
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产品关联
DOI
高影响因子
ChemPlusChem
·
2023
·Vol. 88
·期 6
·e202300138
·
IF 3.4
Hongyu Guo,Jiaqiao Yang,Jian Zeng,Xiaoqi Yu,Shanshan Yu,Lin Pu
Graphical The first near IR fluorescent probe for the chemoselective and enantioselective recognition of arginine in aqueous solution is reported in this work. This probe also allows visual discrimination of the arginine enantiomers because of its fast and distinct color change upon interaction with the substrate. The first near IR fluorescent probe for the chemoselective and enantioselective recognition of arginine in aqueous solution is reported in this work. This probe, made of a 1,1’-binaphthyl-based chiral aldehyde unit and a rhodamine-based near IR chromophore, in combination with La 3+ exhibits highly chemoselective as well as enantioselective fluorescent enhancement with arginine at λ=764 nm upon excitation at λ=690 nm. Little or no fluorescent response is observed toward the chirality miss-matched arginine enantiomer or other common amino acids and their enantiomers. This probe also allows visual discrimination of the arginine enantiomers because of its fast and distinct color change upon interaction with the substrate.
研究领域:
生物化学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
NANO
·
2025
·
IF 1.1
Yi Gou,Jinghong Du,Zilong Wang,Shengyang He,Jiahao Lv
La 3+ single-doped and La 3+ -Mo 6+ co-doped TiO 2 nanotubes were synthesized via anodic oxidation combined with a two-step electrochemical process. Their crystalline structure, microstructure, and light absorption properties were characterized using XRD, SEM, and UV-Vis spectroscopy, followed by methylene blue photocatalytic degradation experiments. The results indicate that both La 3+ single-doping and La 3+ -Mo 6+ co-doping can suppress the transformation of the anatase phase to the rutile phase and inhibit grain growth. The diameters of both types of nanotubes range between 60-80 nm, with La and Mo uniformly distributed throughout the nanotubes. Both La 3+ single-doped and La 3+ -Mo 6+ co-doped induced red shifts in the TiO 2 light absorption peaks. The most pronounced red shift in the light absorption band edges occurred at a La 3+ -Mo 6+ ratio of 3:7, reducing the bandgap width to its minimum value of 2.99 eV. Both La 3+ single-doped and La 3+ -Mo 6+ co-doped TiO 2 exhibited first-order photocatalytic degradation of methylene blue. As the La 3+ single-doped concentration increased or the La 3+ -Mo 6+ co-doped ratio varied from 1:9 to 9:1, both the methylene blue degradation rate and photocatalytic reaction rate initially increased before decreasing, while the half-life initially decreased before increasing. At a La 3+ -Mo 6+ co-doped ratio of 3:7, the photocatalytic activity of the TiO 2 nanotubes was optimal, achieving a maximum degradation rate of 89.73% within 8 hours-a 52% improvement over pure TiO 2 nanotubes.
研究领域:
材料科学
·
光催化
·
纳米技术
·
环境工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）