ACS Applied Nano Materials
·
2021
·
IF 5.097
Yuxian Su,Li Liu,Shipeng Wen
Semiconductor photocatalysis is a promising strategy for wastewater treatment. However, a limited photoresponse range, rapid recombination of photoinduced charge carriers, poor stability, and other problems have posed obstacles to practical applications. Herein, a facile strategy to fabricate a near-infrared-driven broadband photocatalyst was developed by anchoring the core–shell nanostructure of NaYF4:Yb,Tm@NaYF4:Yb,Nd@TiO2 (Tm@Nd@TiO2) onto the surface of porous silica/carbon (mSC) electrospun fibers. The Tm@Nd@TiO2 nanoparticles (NPs) exhibited strong near-infrared light absorption and energy transfer from the NaYF4:Yb,Tm@NaYF4:Yb,Nd core to the TiO2 shell, triggering the photocatalytic reaction. In addition, the interconnected mesoporous structure and carbon network of Tm@Nd@TiO2/mSC was found to be beneficial in improving the adsorption capacity toward organic pollutants, promoting the separation of photogenerated carriers, and further improving the overall photocatalytic performance. The photocatalytic activity of Tm@Nd@TiO2/mSC nanocomposite was evaluated by degrading methyl orange solution in the visible-near-infrared and simulated sunlight regions. The Tm@Nd@TiO2/mSC nanocomposite exhibited excellent adsorption performance. The photocatalytic activity of Tm@Nd@TiO2/mSC was found to be 3 times higher than that of bare Tm@Nd@TiO2 over 60 min.
研究领域:
材料科学
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环境科学
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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
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稀土分离技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 12
·期 3
·1753-1763
·
IF 11.9
Yan Zhao,Yan Zhang,Qianqian Xu,Hanyu Gong,Mingyang Yan,Kaiyu Feng,Xiang Zhou,Xuefan Zhou,Dou Zhang
Hydrothermally synthesized Nd-doped bismuth titanate (Bi3.15Nd0.85Ti3O12, BIT-Nd) hierarchical microspheres with assembled nanosheets were developed for water splitting and wastewater purification utilizing the piezo-phototronic effect for the first time. Undoped Bi4Ti3O12 (BIT) microspheres were simultaneously studied for comparison to reveal the role of Nd doping. Under the combined light and ultrasound excitation, the degradation efficiency of RhB (C0 = 10 mg L−1) solution reached 97.5% in 8 minutes in the presence of the BIT-Nd microspheres, leading to an ultrahigh first-order rate constant k of 0.407 min−1, which was 4.9 times higher than that of the BIT microspheres. More impressively, superior piezo-photocatalytic activity in water splitting compared to that of other reported piezo-photocatalysts was achieved in the BIT-Nd microspheres, which showed a H2 evolution rate of 1330.3 μmol g−1 h−1 without any cocatalyst or scavenger. To understand the origins of the excellent piezo-photocatalytic performance, microstructure analysis and piezoelectric and photoelectric characterization, as well as density functional theory calculations were carried out. After Nd doping, the atomic framework of the Ti–O octahedron underwent an apparent distortion, resulting in a stronger ferroelectric polarization, and thus a larger piezoelectric potential output under pressure. Moreover, the thinner nanosheets in the BIT-Nd microspheres were more susceptible to deformation under the ultrasonic effect, which was also beneficial to generate a higher piezoelectric field that inhibited the charge carrier recombination. Additionally, the presence of Nd 4f orbitals in BIT-Nd effectively reduced the band gap and promoted the spectral absorption and production of photogenerated carriers. These merits enabled the BIT-Nd microspheres to exhibit strong piezo-photocatalytic activity.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
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
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电子工程
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DOI
高影响因子
Small
·
2025
·
IF 12.1
Zhen Shi,Chenxi Fang,Jiaqian Li,Sateesh Bandaru,Muwen Liu,Lizhong Zhao,Xuefeng Zhang
In spite of superior magnetic properties, neodymium–iron–boron (Nd-Fe-B) applications in harsh environments have been greatly hindered by their susceptibility to corrosion, humidity, mechanical, and temperature attacks. Herein, a construction strategy of robust slippery liquid-infused porous surfaces (SLIPS) coatings is proposed via the multi-dimensional design of surface, bulk coating, and interface. The manipulation of colloidal states of silica particles by chemical hydrophobization allows for building a dense polymer network, enhancing interfacial adhesion and locking lubricant film effectively. The resulting coating is demonstrated to be extremely stable, endowing the magnet with excellent liquid repellency, anti-corrosion, and anti-icing properties. Strikingly, no trace of corrosion is detected after 136-day immersion in 3.5 wt.% NaCl solution and the impedance modulus at 0.1 Hz can be maintained as the initial of 3.31 × 10 8 Ω·cm 2 even after 132-day immersion, which is far superior to that of commercial Ni-Cu-Ni, Zn, and EP coatings. Additionally, anti-icing performance at low temperatures is evidenced by the delayed icing time and decreased ice adhesion strength. Importantly, the self-healing property offers the surface intensified durability even after mechanical damage. This work demonstrates a construction strategy of robust SLIPS coatings with a multi-dimensional design, enabling the practical applications of Nd-Fe-B magnets in extreme environments like offshore wind turbines.
研究领域:
材料科学
·
表面工程
·
腐蚀防护
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2026
·
IF 14.3
Binbin Ning,Junyao Wu,Sai Liu,Jinwei Guo,Xiaopeng Hu,Qing Liu,Wang Zhu
A series of five (5RE 0.2 )Ta 3 O 9 high-entropy ceramics (RE = La, Gd, Nd, Dy, Sm, Eu, Ce) is successfully synthesized via a solid-state method. Their temperature-dependent fracture toughness is systematically investigated across the 25–1200 °C range, using in situ three-point bending tests coupled with the digital image correlation method. The fracture toughness exhibits a non-monotonic variation: it peaks at 2.3 MPa m 1/2 at room temperature, then sharply declines to a minimum of 1.5 MPa m 1/2 at 400 °C. Subsequently, an anomalous rebound to approximately 2.1 MPa m 1/2 is observed at 800 °C, followed by a further decrease, stabilizing between 1.7 and 1.9 MPa m 1/2 at 1200 °C. High-temperature X-ray diffraction and high-resolution transmission electron microscope results confirm an irreversible orthorhombic-to-tetragonal phase transformation occurring between 600 and 800 °C. Aberration-corrected STEM provides direct atomic-scale evidence of a high-density dislocation network interacting with crack tips, revealing dislocation pinning, bridging, and crack deflection. The combined action of phase-transformation-induced lattice strain and dislocation-mediated toughening effectively suppresses linear crack advance and enhances energy dissipation, thereby accounting for the partial recovery of fracture toughness at 800 °C. These direct observations establish a distinctive synergistic toughening mechanism in high-entropy ceramics, in which irreversible phase transformation and thermally activated dislocation networks cooperate to improve high-temperature fracture resistance.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Yuxi Gao,Anqi Duan,Shuang Liu,Xiaodong Wu,Wei Liu,Min Li,Shougang Chen,Xin Wang,Duan Weng
Three nanocubic Ag/Ce x Nd 1- x O 2 catalysts were synthesized to evaluate the influence of Nd doping on catalyst practicability. It was observed that Nd doping generated excessive ceria surface oxygen vacancies, but reduced the bulk oxygen vacancies . These variations in oxygen vacancies suppress the utilization of ceria bulk oxygen, and induce the formation of less active O 2− species instead of O 2 − , resulting in a low soot oxidation activity. However, the introduction of Nd can inhibit Ag sintering and thus enhance the catalysts’ thermal stability effectively. As a consequence, Ag/Ce 0.95 Nd 0.05 O 2 nanocubes make a good balance between the catalyst activity and stability. Moreover, it was observed that catalyst deactivation during soot oxidation becomes more obvious when the catalysts and soot are not in close contact.
研究领域:
催化化学
·
环境科学
·
材料科学
·
能源技术
·
大气污染防治
✓ 已验证
DOI
高影响因子
HYDROMETALLURGY
·
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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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Lei Cai,Xiang Song,Cheng-Bao Liu,Lan-Yue Cui,Shuo-Qi Li,Fen Zhang,M. Bobby Kannan,Dong-Chu Chen,Rong-Chang Zeng
This work reports the design and preparation of novel organic (polyvinyl alcohol, PVA)-inorganic (neodymium nitrate, Nd(NO 3 ) 3 ) hybrid coatings on micro-arc oxidation (MAO) coating for magnesium (Mg) alloy corrosion protection . X-ray diffractometer , X-ray photoelectron spectroscopy, fourier transform infrared spectroscopy , field emission scanning electron microscope , Energy Dispersive X-ray spectrometer and surface roughness were applied to characterize the chemical composition and surface morphology of the coatings. The corrosion resistance of the coatings was evaluated by electrochemical and salt spray tests. The results suggested that the formation of PVA-Nd 3+ and PVA-Mg 2+ complexes promoted the enrichment of Nd 3+ on the surface, and thereby improved the sealing quality and compactness of the coating. Interestingly, when the coating was damaged, the Nd 3+ ions were transformed to their carbonates and covered the active sites, and thus exhibiting self-healing function. Further, the corrosion resistance of PVA-Nd 3+ modified MAO composite coating on AZ31 Mg alloy was improved.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
·
2026
·
IF 3.3
Qishuai Huang,Shouqian Zhao,Yali Sun
Determining rare earth elements (REEs) and Sr-Nd isotope ratios at low abundance levels in ultramafic rocks remains a significant challenge. This study presents a simplified method for the separation of trace multi-elements using a tandem column of SR-TODGA resin combination, and thereby the elements at very low levels, and 87Sr/86Sr and 143Nd/144Nd ratios in ultramafic rocks were determined by inductively coupled plasma-mass spectrometry (ICP-MS) and thermal ionization mass spectrometry (TIMS). The samples were digested using HF-HNO3, and prepared to HNO3-H3BO3 solutions. After loading the sample solutions onto the tandem column, Sr was eluted from the SR resin column using 10 mL of 0.045 M HNO3. The TODGA column was eluted sequentially with 10 mL of 0.45 M HNO3 and 1.4 M HF for Zr, Hf, Th and U, 7 mL of 2.1 M HCl for La, Ce and Pr, 5 mL of 1.5 M HCl for Nd, and 10 mL of 0.06 M H2SO4 for other REEs (Sm-Lu and Y). The procedural recovery yields were evaluated by adding standards, and they ranged from 97.3% for La to 103.9% for Th. The blank ranges from 0.01 ng (Ho, Tm and Lu) to 24.4 ng (Sr). Eight ultramafic reference materials, JP-1, DTS-2b, UB-N, MUH-1, SARM-6, Harz01, DZΣ-1 and DZΣ-2, were analyzed, and the analytical results exhibit good agreement with certified and literature values. Therefore, the proposed method can be applied to accurately analyze both the contents of multi-elements at very low levels and Sr-Nd isotopic ratios in ultramafic rocks.
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
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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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Ting Wang,Ting Xu,Shang Gao,S.-H. Song
BiFeO 3 , BiFe 0.95 Nb 0.05 O 3 and Bi 1− x Nd x Fe 0.95 Nb 0.05 O 3 ( x =0.0, 0.05, 0.10, 0.15 and 0.20) nanoparticles are successfully synthesized via a tartaric acid-assisted sol-gel technique for the first time. The effect of Nd and Nb co-doping on the structure, morphology, and magnetic and optical properties is investigated. X-ray diffraction (XRD) and Raman measurements demonstrate that Nd 3+ ions and Nb 5+ ions co-doping at A and B-sites of BiFeO 3 can result in a structural transformation (from single rhombohedral phase ( R 3 c ) to two coexisting phases ( R 3 c and Pbam)). The morphology of the nanoparticles seems to be approximately cubic, and by the co-doping, the size of the nanoparticles decreases from ~132 to ~35 nm. Notable improvement in the remanent magnetization of the sample with x =0.15 is observed with a value of 0.285 emu/g, being 20 times higher than that of the undoped sample (BiFeO 3 ). A decrease in the optical band gap is also observed in the Nd and Nb co-doped nanoparticles, indicating their favorable potential in photocatalytic applications.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）