JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Ruihan Li,Feng Hu,Ran Wu,Jianyi Xu,Jin Xu,Zhonghui Hou,Min Zhou,Junyu Bai,Yanghuan Zhang
In the present study, the synthesis of NdMg 12 + x wt%Ni( x = 0, 5, 10, 15) alloy was effectively accomplished through the technique of ball milling , and the profound impact of Ni on the microstructural attributes, as well as the hydrogen absorption and desorption characteristics of NdMg 12 alloy, was meticulously examined. The microstructural analysis reveals that Ni can notably facilitate the development of nanocrystalline and amorphous structural configurations. Subsequent investigations uncovered that a portion of Ni was transformed into the Mg 2 Ni phase on the surface of the NdMg 12 alloy, thereby increasing the number of hydrogen absorption active sites and subsequently enhancing the hydrogen absorption and desorption capabilities of the NdMg 12 +Ni alloy. A thermodynamic analysis reveals that the incorporation of Ni exerts a substantial elevating effect on the hydrogen desorption plateau pressure of NdMg 12 +Ni alloy. As the Ni content escalates from 0 wt% to 5 wt%, the enthalpy of the hydrogen desorption process plummets significantly, from 89.1888 kJ/mol H 2 to 80.2806 kJ/mol H 2 . Concurrently, the addition of Ni markedly diminishes the hysteresis coefficient during hydrogen absorption and desorption, thereby enhancing the overall hydrogen absorption and desorption efficiency of NdMg 12 +Ni alloy. Moreover, the inclusion of Ni not only expedites the hydrogen absorption rate within the NdMg 12 +Ni alloy but also substantially diminishes the activation energy for hydrogen desorption, effectively lowering the minimal hydrogen desorption temperature from 261℃ to 199℃. Notably, the NdMg 12 + 10 wt%Ni alloy exhibited the lowest activation energy (Ea = 114.4995 kJ/mol) and demonstrated superior hydrogen desorption kinetics.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Yuzhe Zhang,Zhenhao Fan,Jie Hua,Xin Gao,Liwei Lin,Zhongyu Li
Neodymium is a crucial strategic resource, which requires enhanced adsorption and recovery methods. Various researchers have utilized chitosan as an adsorbent for neodymium element adsorption. However, the low surface negative charge of the chitosan adsorbent affects its adsorption efficiency, and its inadequate mechanical properties hinder reusability. To address these issues, this study developed two composite membranes: the 3D wood imprinted carboxylated chitosan composite membrane (3DW-ICNTs/COOH/CS) and the 3D wood carboxylated chitosan composite membrane (3DW-CNTs/COOH/CS) for the separation and recovery of rare earth Nd(III). Kinetic experimental results indicate that both composite membranes reached 80% of maximum adsorption capacity within 200 min, indicating the significant negative charge on the surface of the carboxylated carbon nanotube-modified chitosan material. Even after ten adsorption and desorption cycles, imprinted composite membranes maintained a removal rate of about 80%. The utilizing delignified wood as a support material preserved the mechanical properties of the composite membrane, thereby providing a favorable condition for its industrial application.
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Journal of Materials Chemistry C
·
2025
·Vol. 13
·期 31
·16040-16051
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IF 5.1
Jin Zhou,Tong Shi,Ri-Tao Huang,An-Di Liu,Gao-Shang Gong,Yong-Qiang Wang,Lang-Sheng Ling,Jing-Xin Li,Yu-Yan Han,Wei Tong,Zheng-Cai Xia,Zhao-Ming Tian
The diverse exotic magnetic states realized in one-dimensional (1D) spin-chain systems have motivated the extensive exploration of new materials with a 1D spin-chain motif, while 1D magnets comprising rare-earth (RE) ions are largely unexplored compared with their 3d transition metal (TM)-based counterparts. Herein, we report the synthesis and magnetic properties of a family of RE-based zigzag spin-chain Ba2REV3O11 compounds (RE = Pr, Nd, and Gd–Ho) crystallized into a monoclinic structure with the space group P21/a, wherein spin chains are connected by edge-sharing REO6 octahedra along the b axis and well separated by nonmagnetic VO4 tetrahedra extended within the ac plane. Moreover, the nearest neighbor (NN) intrachain RE–RE distance (dintra, ∼3.856–3.952 Å) is much shorter than the NN interchain separation (dinter, ∼5.191–5.246 Å), supporting quasi-1D characteristics. Magnetic susceptibility and isothermal magnetization measurements revealed that only Ba2DyV3O11 displays a magnetic anomaly at ∼2.9 K and other family members do not order down to 1.8 K. Among them, Ba2GdV3O11 with a spin-only magnetic moment (S) of 7/2 exhibits a long-range magnetic order with TN ∼ 0.67 K and a large magnetocaloric effect with a maximum magnetic entropy change (ΔSM) of 14.3 J K−1 (mol-Gd)−1 under a magnetic field change (Δμ0H) of 4 T at a temperature of ∼1 K, making it a suitable material for magnetic refrigeration in sub-Kelvin temperature regimes.
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CERAMICS INTERNATIONAL
·
2020
·Vol. 46
·期 10
·16524-16532
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IF 3.83
Muhammad Yousaf,Asma Noor,Shuai Xu,Majid Niaz Akhtar,Baoyuan Wang
Yttrium iron garnet (YIG) nanoparticles (NPs) doped with rare earth (RE) metal ions (Y 2.5 Sm 0.5 Fe 5 O 12 , Y 2.5 Nd 0.5 Fe 5 O 12 ) were successfully synthesized by sol-gel auto combustion approach. The cubic crystalline structure and morphology of the prepared garnet ferrite NPs were analyzed by X-ray diffractometer (XRD) and field emission scanning electron microscopy (FESEM). The cubic crystalline garnet phase of the synthesized YIG, Sm-YIG and Nd-YIG samples was successfully achieved at 950 °C sintering temperature . The force constant and absorption bands were estimated by using Fourier transform infrared spectroscopy (FTIR). The doping effect of RE metal ions on the chemical states of YIG were examined by x-ray photoelectron microscopy (XPS). The valence band (from 12.63 eV to 13.22 eV), conduction band (from 10.89 eV to 11.34 eV) edges and optical bandgap values of RE doped YIG samples were calculated using UV–Vis spectroscopy and ultraviolet photo electron spectroscopy (UPS). The magnetic analysis of the prepared NPs was studied using vibrating sample magnetometer (VSM). The XPS analysis of RE doped YIG samples exhibit the existence of RE (Sm +3 , Nd +3 ) contents on the surface of YIG ferrite by decreasing the oxygen lattice in garnet structure. The optical bandgap (from 1.74 eV to 1.88 eV) explains the semiconducting nature of the synthesized NPs. The UPS results confirm the valence band position of YIG doped samples. The saturation magnetization and remanence of RE doped garnet ferrite samples increased from 13.45 to 18.83 emu/g and 4.06–6.53 emu/g, respectively.
研究领域:
材料科学
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纳米科技
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固体物理
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无机化学
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功能材料
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Shuyang Li,Zhou Fang,Qingqing Liu,Jiangjiexing Wu,Peng Gu,Xiaohui Mao,Liping Zhu,Meifang Zhu
Rare earth elements (REEs) are indispensable for advanced technologies, and their recovery from low-concentration industrial wastewater is of great significance for resource utilization and environmental protection. However, the recovery is often hindered by insufficient adsorption capacity and severe interference from coexisting ions. Herein, an ion-imprinted aerogel (PPN@CP-IP) was developed by polymerizing 2-hydroxyethyl 2-methyl-2-propenoate phosphate in the presence of phosphorylated cellulose fibrils using Nd(III) as template. The adsorption kinetics and isotherms were well fitted by the pseudo-second-order and Langmuir models, respectively, indicating chemisorption-dominated monolayer adsorption. PPN@CP-IP exhibited a maximum adsorption capacity of 198.8 mg/g for Nd(III). When the Fe(III) concentration was four times that of Nd(III), the distribution coefficient for Nd(III) remained high at 12202 mL/g. Additionally, after nine adsorption–desorption cycles, the adsorption and desorption efficiencies remained 89.27% and 90.13%, respectively. Adsorption was mainly attributed to electrostatic attraction and coordination between Nd(III) and hydroxyl/phosphate groups. The influencing factors under single-variable and multivariable conditions were investigated using the XGBoost machine learning model. The aerogel was applied in actual waste NdFeB magnet leaching solution, the adsorption capacity of Nd(III) was as high as 167.9 mg/g, while that of iron ions was only 7.3 mg/g. This work provides a robust strategy for highly selective REEs recovery from complex low-concentration wastewater, offering a promising pathway for sustainable rare earth resource recycling and hazardous waste treatment.
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JOURNAL OF MOLECULAR LIQUIDS
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2022
·
IF 6.633
Wenfeng Xue,Ronghao Liu,Xiaoxia Liu,Yangyang Wang,Ping Lv,Yanzhao Yang
The development of an environmentally friendly extractant for selective recovery of rare earth elements is critical but still faces significant challenges. Two low viscosity carboxylic acid based ionic liquids [A336][BTA] and [A336][OTA] were synthesized for selective extraction of Nd(III) from waste NdFeB magnets. First, the extraction behaviors of two kinds of ionic liquids were compared under different conditions, such as time, pH value of aqueous phase, dosage of ionic liquids, and concentration of salting-out agent. The optimal extraction condition of [A336][OTA] was optimized by response surface methodology, and the extraction efficiency reached 99.1%. The extraction mechanism was proposed as ion association by UV–Vis spectrum, IR spectrum and 1 H NMR, and was supported from that perspective of quantum chemical calculation. The extraction thermodynamics, kinetics and isothermal model were studied in detail. [A336][OTA] maintained an extraction efficiency of 95.6% even after seven cycles. The extractant shows good selective separation performance in waste NdFeB magnets, and is an extractant with good application prospect. This work has provided an environmentally friendly extractant for the recovery of Nd(III) from waste NdFeB magnets.
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Leilei Sun,Sisi Shi,Hongchao Geng,Yao Huang,Yan Qiao,Jie Song,Lan Yang,Craig A. Grimes,Xinxin Feng,Qingyun Cai
Bacterial infections are a serious ongoing threat to human health. As such, within the context of modern technology, there is an urgent need to develop fluorescent probes suitable for diagnosing bacterial infections in vivo. Herein, we synthesize NaGdF4:Nd@NaGdF4 core-shell down-conversion nanoparticles (DCNPs) demonstrating excellent emission intensity in the second near-infrared (NIR-II) window for use as fluorescent probes to enable high-quality imaging of pathogenic infections. The fluorescent probe is covalently linked with vancomycin (Van), which specifically binds to Gram-positive bacteria such as S. aureus. Both in vitro detection and in vivo imaging results show that the Van-modified NIR-II fluorescent probe can distinguish Gram-positive from Gram-negative bacteria with a high degree of selectivity. Biocompatibility is verified by MTT assay and histological analyses.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 4
·2870-2882
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IF 4.682
Han Ni,Xu Shishi,Zhang Qinfang
The Bi 2 MO 4 Cl (M = Gd and Nd) nanosheets were prepared by a molten salt flux method for the first time. The resulted Bi 2 GdO 4 Cl (F-BG) nanosheets showed the highest photocatalytic activity for oxygen (O 2 ) evolution and trypan blue (TB) degradation than Bi 2 NdO 4 Cl (F-BN), Bi 2 GdO 4 Cl (S-BG) and Bi 2 NdO 4 Cl (S-BN) synthesized by a solid-state method. The F-BG nanosheets showed the larger specific surface areas and abundant pores, which could provide more reactive sites. The photoelectrochemical and photoluminescence (PL) results revealed that F-BG sample had the excellent separation and transfer rates of photogenerated charge carriers, leading to the highly photocatalytic performance for both O 2 evolution and TB degradation. The UV–Vis diffuse reflectance spectra (DRS) showed all samples had the visible-light-responsive characteristic. The radical trapping experiment revealed hole (h + ) played a major role, while superoxide radical ( \(\cdot {\text{O}}_{{2}}^{ - }\) ) contributed a little to photocatalytic degradation process. Thus, a possible photocatalytic mechanism was proposed based on the radical trapping experiment. This work shows us a useful insight into the preparation of highly active bismuth-based oxyhalide nanosheets photocatalysts by a molten salt synthesis through surface modification and morphology control and provides the possibility of water splitting under visible light.
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CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Zhao Zhang,Ningning Ma,Xiena Kang,Xinping Li,Shuangquan Yao,Wenjia Han,Hui Chang
A series of lanthanide-based nanopaper (Nd-nanopaper) was synthesized via a neodymium organic framework (Nd-MOFs)-grafted TEMPO-oxidized cellulose nanofibrils (tCNF) using a solvothermal reaction. Not using the traditional down-conversion visible emissions of anti-counterfeiting techniques, this Nd-nanopaper achieved down-conversion near-infrared (NIR) and up-conversion visible emissions. The down-conversion luminescent property of these Nd-nanopapers exhibited characteristic NIR luminescence ( λ Em = 1080 nm) of Nd 3+ ions with 311 nm excitation, undergoing an “antenna” effect. In contrast, the up-conversion visible light emission ( λ Em =450 nm) of Nd-nanopaper was detected under 580 nm excitation. The mechanism of up-conversion fluorescence was ascribed to excited-state absorption and energy transfer up-conversion. Interestingly, Nd-nanopaper induced both up and down-conversions for visible and NIR emissions that were completely devoid of the interference from fluorescent brighteners and background fluorescence. These switchable up and down-conversion fluorescent Nd-nanopapers with visible and NIR dual emissions or dual channels could be applied in high level anti-counterfeiting applications.
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PubMed
高影响因子
Functional Materials Letters
·
2020
·
IF 2
Zhong Yang,Jing Wang,Long He,Chaoyong Deng,Kongjun Zhu
Flexible dielectric capacitors are becoming shining stars in modern electronic devices. Ceramic particles with large dielectric constants and benign compatibility are attractive candidates to enhance the energy storage density of pristine polymer capacitors while guaranteeing their flexibility. In this work, double-shell structure of Al 2 O 3 (AO) and dopamine (PDA) were successively coated on the Nd-doped BaTiO 3 (NBT) particles and then introduced into the Poly(vinylidene fluoride) (PVDF) matrix. Obvious enhancement in dielectric constants was observed while the dielectric loss remained nearly constant. For the composite films with 1–4 vol.% NBT@AO@PDA NPs, the maximum energy density of 9.1 J/cm 3 and energy efficiency of 65% was achieved at 430 MV/m in the sample with 1 vol.% filling ratio, which are 1.4 and 1.3 times larger than those of pristine PVDF at 450 MV/m. The finite element simulation reveals the effective relief of the electric field concentration in the composite film induced by the AO and PDA layers. The greater improvement in the energy storage performance could be anticipated if the dispersity of NBT@AO@PDA NPs was further improved.
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INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Zhen Pu,Jianwei Qin,Xiaoguo Fu,Ruizhi Qiu,Bin Su,Maobing Shuai,Fang Li
Fundamental investigation of metal–CO interactions is of great importance for the development of high-performance catalysts to CO activation. Herein, a series of side-on bonded mononuclear lanthanide (Ln) oxocarbonyl complexes OLn(η2-CO) (Ln = La, Ce, Pr, and Nd) have been prepared and identified in solid argon matrices. The complexes exhibit uncommonly low C–O stretching bands near 1630 cm–1, indicating remarkable C–O bond activation in these Ln analogues. The η2-CO ligand in OLn(η2-CO) can be claimed as an anion on the basis of the experimental observations and quantum chemistry investigations, although the CO anion is commonly considered to be unstable with electron auto-detachment. The CO activation in OLn(η2-CO) is attributed to the photoinduced intramolecular charge transfer from LnO to CO rather than the generally accepted metal → CO π back-donation, which conforms to the traditional Dewar–Chatt–Duncanson motif. Energy decomposition analysis combined with natural orbitals for chemical valence calculations demonstrates that the bonding between LnO and η2-CO arises from the combination of dominant ionic forces (>76%) and normal Lewis “acid–base” interactions. The fundamental findings provide guidelines for the catalyst design of CO activation.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Yun Xie,Da-Li Chen,Yu-Long Wei,Nan Zhang,Wen-Dong Yao,Sheng-Ping Guo
Exploration of new compounds belonging to unusual families is always attractive for the everlasting development of material science. Here, three isomorphic rare-earth sulfide borates RE 3 S 3 BO 3 (RE = Nd, Tb, Dy) have been obtained via a facile metal oxide-boron-sulfur solid-state routine. Their centrosymmetric triclinic structures feature 3 D framework built by three types of REO x S y units, viz. REOS 6 , REO 4 S 3 , and REO 3 S 6 . Their structural relationship with similar phases and lanthanide contraction rule are discussed. Their optical band gaps are measured to be 2.59–2.70 eV, and the corresponding theoretical calculations are also performed. This work enriches the rarely studied chalcogenide borate system and is conducive to discovering more inorganic materials .
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