JOURNAL OF RARE EARTHS
·
2021
·
IF 3.712
Xianghua He,Ben Dai,Yafang Zhang,Dan Zhao,Dihui Zhang,Ruping Liang,Chao Chen
Efficient and applicable catalysts are highly desirable for advanced biomass transformation industry, here, we fabricated a series of Nd-Co-P catalysts for hydrogenation of furfural (FAL) to furfuryl alcohol (FOH). By comprehensive characterizations, it is demonstrated that the prepared Nd-Co-P samples are structured as (NdPO 4 ) m /Co 2 P nanocomposites with molar ratio ( m ) in range of 0.24–1.1; by manipulating m , the outstanding catalytic efficiency comparable with the performance of precious metal catalysts , such as turnover frequency (TOF) up to 0.50 s −1 (being ten-fold higher than Co 2 P) and FOH yield up to 97%, is achieved on the reusable (NdPO 4 ) m /Co 2 P composites. Temperature programmed desorption (TPD), in-situ infrared spectroscopy (IR) and kinetic-mechanism studies further disclose that Co 2 P is decisive for activating FAL, instead, NdPO 4 possesses unique capability of activating hydrogen which readily facilitate the selective hydrogenation of FAL to FOH through a rapid Langmuir–Hinshelwood process over (NdPO 4 ) m /Co 2 P catalyst. These results indicate that rare-earth phosphates like NdPO 4 can act as the promising and reliable catalytic component to activate hydrogen, which can be of interest not only for innovating novel and applicable non-metallic catalysts for sustainable biomass transformation analogous to hydrogenation of FAL, but also for expanding material base for other green mass transformation techniques involving hydrogen.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Ningyi Chen,Chenhao Ni,Shuang Wu,Du Chen,Bingjun Pan
Phosphorus (P) control has been recognized as an imperative task to mitigate water eutrophication and settle the imminent shortage of P resources. Despite intensive effort put into this matter, it is still generally challenging for the current methods to remove and even potentially recover phosphorus (as phosphate) from complicated water matrices. To this end, we proposed a novel nanocomposite via coupling polystyrene anion exchanger (PsAX) with hydrated neodymium oxide (HNdO) nanoparticle for selective removal of phosphate. The developed nanocomposite, i.e., HNdO-PsAX, exhibited quite stable and efficient phosphate adsorption over a wide pH range of 3.0–10.0 with the maximum adsorption capacity as 85.4 mg P/g. It also showed satisfied anti-interference against various competing substances; notably, HNdO-PsAX obviously outperformed Phoslock, a commercial lanthanum-based adsorbent exclusively for phosphate sequestration, particularly under the interference of bicarbonate and humic acid, which were admitted as the paralyzing factors for Phoslock. The superior affinity of HNdO-PsAX towards phosphate, driven by the specific Nd-P inner-sphere complexation as evidenced by XPS , FT-IR, and the lattice evolution of HNdO nanoparticle, renders the nanocomposite eminently suitable for sequestrating trace phosphate. Fixed-bed treatment validated that HNdO-PsAX was capable of treating ∼11,800 bed volume of a simulated wastewater (from 2.0 to below 0.5 mg P/L), approximately 12 times higher than that of the previously reported Fe-based nanocomposite (HFO-PsAX, ∼ 900 BV); also, a satisfactory outcome in treating authentic municipal wastewater by HNdO-PsAX and the feasibility of regenerating the exhausted one by a binary NaOH-NaCl solution were recognized. This work provides a new potion of enhanced phosphorous control for surface water and wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2023
·
IF 2.8
Kaibo Hu,Yucheng Liu,Xiaowen Zhou,Fang Gao,Chuanqi Zhang,Tianci Chen,Ke Li,Jiuyang Lin,Xuewei Li
The waste products of NdFeB magnets are an attractive resource for the recovery of rare earth elements (REEs), especially for neodymium [Nd]. Conventional methods employed to remove ferric (Fe[II]) from Nd solutions involve high energy consumption and the extensive use of chemicals, including oxidants and pH regulators, leading to substantial wastewater generation. In this work, an environmentally friendly approach utilizing CaMg(CO3)2 was presented to remove Fe(II) from Nd solution. Under optimized conditions, including a reaction temperature of 70°C, a CO32-/Fe2+ ratio of 1.5/1, a reaction time of 240 min, and an initial concentration of 200 mg/L, the heterogeneous precipitation reaction on the surface of CaMg(CO3)2 exhibited an exceptional Fe(II) removal efficiency of 98.6%, with a negligible loss of Nd (only 0.8%). It was observed that the CaMg(CO3)2 not only provide a suitable alkaline environment for the selective precipitation of Fe(II), but also significantly enrich the concentration of dissolved oxygen at a high temperature. In fact, at a CaMg(CO3)2 concentration of 2 g/L, the dissolved oxygen concentration in the solution increased significantly to 15.5 mg/L at 70°C. Consequently, the usage of CaMg(CO3)2 facilitated the rapid conversion of Fe(II) to Fe(III) without the need for additional oxidants, which was perfect for the removal of Fe(II) rather than Nd.
研究领域:
环境科学
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化学工程
·
稀土回收
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Shuaitao Qin,Zhongjie Cui,Zhuoqi Wen,Dan Yang,Haiyang He,Jinchan Zhao,Mingliang Zhang,Shiliang Mei,Wanlu Zhang,Ruiqian Guo
Colloidal indium phosphide (InP) quantum dots (QDs) have attracted worldwide attention due to their intrinsic environmental friendliness and excellent optical properties. The incorporation of metal ions has been a common way to modify the properties of InP QDs and some metal ions have been confirmed to be effective in preparation of blue-emitting InP QDs. Herein, the interfacial anchoring effect of rare earth metal ions neodymium(III) (Nd 3+ ) is unveiled for the first time by analyzing the alteration of spectra, size, and composition of QDs after Nd doping. It is evidenced that Nd substitutes for In of InP during the process of nucleation. More crucially, Nd is anchored at the surface of InP and inhibits their further growth at the high temperature of shelling. This ensures that the size of InP QDs and the absorption peak position are almost maintained during shell growth. It is demonstrated that the emitting wavelength of InP/ZnS core/shell QDs is systematically tunable through varying Nd amounts. Finally, the optimized InP/ZnS QDs exhibiting an emission peak of 470 nm with a photoluminescence quantum yield of 44%, and a full width at half-maximum of 46 nm are prepared.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2020
·
IF 3.104
Vivian Andoh,Huaiyang Guan,Lin Ma,Weiguo Zhao,Long Li,Guohua Wu
Neodymium (Nd) is one of the most famous members of rare earth elements family. With the increasing global demand for Nd, it can inevitably enter the environment and affect the ecological environment through the food chain and other ways. Therefore, it is very important to study the biological effects of Nd. In this study, the biological effects of 3 kinds of Nd compounds, i.e. neodymium oxide (Nd 2 O 3 ), neodymium chloride (NdCl 3 ) and neodymium nitrate (Nd(NO 3 ) 3 ), were evaluated by using silkworm models through the method of intravascular injection. Each of the three Nd compounds was prepared into 6 groups at different concentrations (40, 50, 60, 70, 80, 90 μg/μL). The results show that within the certain concentration range, Nd compounds show great damage to the growth of silkworms since high death rate is observed: the death rate from Nd 2 O 3 group is floating between 30% and 80%, the one from NdCl 3 group is between 17% and 33% and that from Nd(NO 3 ) 3 group is between 23% and 37%. It also reveals that Nd compounds have some negative effects on the body length and weight of silkworms. However, the histophysiological study shows that the three Nd compounds cause no obvious negative effects on the cell morphologies in midgut, fat body and silk gland. The XRD and FTIR spectra show that the secondary and the crystalline structures of silks are not destroyed, the TGA and DTG data exhibit that the thermal stability of silks is not damaged, and the tensile test shows that the mechanical properties of silks are not affected significantly by the intake of Nd compounds. In general, the intake of Nd compounds has significant inhibitory effects on silkworm growth but little negative impact on silk structures or cell morphology, the study can provide useful toxicological data for the safe application of Nd compounds in various fields.
研究领域:
环境科学
·
生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2017
·
IF 3.454
Yi Ding,Hui Dan,Xirui Lu,Xiaoyan Shu,Zhihao Hong,Shuai Zhang
A series of Zr 1- x Nd x O 2- x /2 (0 ≤ x ≤ 1) ceramics was prepared by solid-state reaction method. The effects of Nd content on the phase evolution were investigated. The chemical durability of resulting waste forms was also examined. The results show that the ceramics with x < 0.1 show monoclinic and cubic zirconia phase, with 0.2 ≤ x < 0.4 exhibit a single cubic phase, with 0.4 ≤ x ≤ 0.6 exhibit a single pyrochlore phase, with 0.6 < x < 0.8 exhibit a single cubic phase and remain cubic phases and hexagonal Nd 2 O 3 when 0.8 ≤ x ≤ 1. The unit cell parameters of the Nd-doped zirconia samples increase as the Nd content increases. Moreover, the normalized element release rates of Nd element in Nd-doped zirconia ceramics firstly decrease with leaching time and almost no change after 21 days (∼0 −6 g m −2 d −1 ), demonstrating its good chemical durability.
研究领域:
材料科学
·
核废料管理
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xuliang Zhang,Miaoyuan Zhang,Sifeng Zhang,Tolkyn S. Baizhumanova,Svetlana A. Tungatarova,Heng Zhang,Changdong Chen,Yongjun Han,Xiangqian Li,Shuang Ma
Developing highly efficient and long-lasting electrocatalysts for the oxygen evolution reaction (OER) in acidic conditions is crucial for advancing proton-exchange membrane water electrolysis (PEMWE) technology. In this work, we present a high-performance OER catalyst by doping the rare-earth element neodymium (Nd) into cobalt oxide (Co 3 O 4 ). The Nd-doped Co 3 O 4 catalyst demonstrates exceptional OER performance, exhibiting an overpotential of merely 304 mV at 10 mA cm −2 in 0.5 M H 2 SO 4 . This performance exceeds that of most non-noble-metal-based catalysts and is comparable to some Ru-based noble-metal catalysts. Furthermore, the catalyst demonstrates excellent long-term stability, maintaining stable performance even after continuous operation in the PEM flow cell for 24 h. Density functional theory (DFT) computations reveal that Nd doping refines the electronic structure of Co 3 O 4 , boosts electrical conductivity, and decreases the energy barriers associated with the formation of crucial OER intermediates. Additionally, the introduction of Nd induces oxygen vacancies and modulates the valence states of cobalt, further enhancing the material's structural stability. This work introduces a novel and effective approach to designing cost-effective, high-performance OER electrocatalysts, providing valuable insights for advancing sustainable energy conversion technologies.
研究领域:
材料科学
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催化化学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2025
·
IF 11
Shi Hao,Gao Han,Qin Long,Yuan Jiang-Tao,Tang Lin-Xuan,Wang Zhuo-Rui,Li Wei-Jin,Feng Zeng-Hui,Wang Yang,Xie A-Ming
Structural manipulation plays a crucial role in material design, exerting a significant influence on various aspects of material performance. However, the impact of material microstructure on electromagnetic waves absorption properties has not been thoroughly investigated. In this study, based on ferrites, we controlled the microstructural morphology by doping with light rare earth element Nd, and then formed heterogeneous structures through composite polypyrrole to enhance its performance. The structural changes in neodymium-doped ferrites and their corresponding variations in performance were systematically analyzed. The results indicate that Nd 3+ ions doping has a pronounced effect on the microstructure of ferrites, significantly improving their dielectric loss capability for electromagnetic waves. The sample with optimal performance, Sr 0.75 Nd 0.25 Co 2 Fe 16 O 27 @PPy, has a value of minimum reflection loss that can reach −63.11 dB, and the effective absorption bandwidth achieves 6.40 GHz at 2.27 mm. This study provides instructive thinking for the structural manipulation of MA materials. Graphic abstract
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 13
·8641-8651
·
IF 3.9
Li Xiaoya,Ma Yongcun,Peng Shusen,Tian lixi
The traditional aqueous electroplating of zinc film causes significant corrosion of NdFeB during the electroplating process, which is accompanied by hydrogen evolution reactions. In this study, electroplating zinc film is carried out from a chloride-free nonaqueous bath using zinc acetate (Zn(OAc)2) as the main salt, sodium acetate (NaOAc) as the conducting salt, and ethylene glycol (EG) as the solvent. The electrochemical properties of the EG bath with Zn(OAc)2 and NaOAc are characterized by means of cyclic voltammetry (CV) and linear sweep voltammetry (LSV) together with a Hull cell test on brass. The results of the experiment show that the Zn(OAc)2 concentration, current density, and temperature significantly impact the deposition behavior of zinc. Moreover, the open circuit potential (OCP) test and scanning electron microscopy (SEM) results demonstrated that the corrosion of NdFeB in the EG bath containing 0.7 M Zn(OAc)2 and NaOAc is effectively inhibited compared to when using the traditional aqueous zinc plating bath. A dense zinc film with a metallic appearance is successfully deposited on the NdFeB surface from the EG bath containing 0.7 M Zn(OAc)2 and NaOAc at 6 mA cm−2 and 60 °C. Comparative experiments demonstrate that the as-deposited Zn film exhibits superior protective performance and exerts less damage to NdFeB compared to the aqueous electroplating film.
研究领域:
材料科学
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电化学
·
表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Changchao Su,Yuheng Sun,Hongqun Tang,Youbin Wang,Fuxu Tao,Zhengbin Xu,Chunhua Wei,Zezuo Jiang,Shiqiang Wei
Rare-earth metal neodymium is an important raw material for NdFeB permanent magnets, and its demand has significantly increased in recent years. Molten salt electrolysis is the main method for the production of metal neodymium, so the study of the electrodeposition process of neodymium ions in molten salt at the cathode is of great significance for the production of metal neodymium. In this paper, the electrochemical deposition process of neodymium ions on a tungsten working electrode was studied in a LiF-NdF 3 -Nd 2 O 3 molten salt system using electrochemical methods such as cyclic voltammetry and open circuit potential. Additionally, the influence of LiF content in the molten salt on the electrodeposition process was analyzed. The experimental results indicate that the reduction of neodymium ions in the LiF-NdF 3 -Nd 2 O 3 molten salt system consists of two stepwise quasi-reversible redox reactions: Nd(III) → Nd(II) and Nd(II) → Nd(0). The corresponding reduction peak potentials are −0.78 V and −1.19 V, respectively. The Nd(III) → Nd(II) reaction is solely diffusion-controlled, while the Nd(II) → Nd(0) reaction is governed by both surface control and diffusion control in the electrochemical process. The increase in LiF content in the molten salt leads to a shift of the cathodic overpotential in the positive direction. When the LiF content is high, the reduction of neodymium ions on the electrode becomes unstable, making it unfavorable for the deposition of metal neodymium on the tungsten electrode.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Yi Ding,Zhengdi Jiang,Yanjun Li,Hui Dan,Xirui Lu,Yushan Yang,Tao Duan
Zircon , ZrSiO 4 , has a structure that can incorporate actinides. Therefore, the susceptibility of the zircon structure to irradiation damage has been investigated by accelerated irradiation experiments. Synthetic Zr 1− x Nd x SiO 4− x /2 ( x = 0, 0.01, 0.10) ceramics were irradiated with 0.5 MeV 4 He 2+ ions (fluences 1 × 10 14 –1 × 10 17 ions/cm 2 ) at room temperature. The irradiation effects on phase structure and chemical stability of the ceramics were investigated. It is found that the main crystal structure is maintained, however, little amorphization is leaded as a result of intensified irradiation. Raman spectra reveal that the main peaks slightly broaden and weakened with increasing fluence, indicating little amorphization has been induced by irradiation. The irradiation resistance is enhanced by the growing neodymium content. Moreover, microtopography and element distribution have no changed even after irradiation. Although the LR Nd increases slightly with increasing Nd loading and irradiation, the excellent chemical stability (∼10 −4 g m −2 d −1 ) is maintained.
研究领域:
材料科学
·
核科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Yusheng Yang,Chaoqun Lan,Yingcai Wang,Zengwu Zhao,Baowei Li
In this work, a simple and sustainable approach is proposed to recover rare earths and iron from an ultrafine NdFeB waste. Rare earths are directly recovered by one-step precipitation in hydrofluoric acid and the dissolved iron by electrodeposition. The rate constant and activation energy of the reaction of rare earth hydroxide with hydrofluoric acid are investigated to understand the kinetics of iron leaching and rare earth precipitation. The rare earth precipitation is much faster than the iron leaching, enabling the rare earths separation from iron after a complete iron dissolution. The cathodic deposits of iron were characterized by X-ray photoelectron spectrometer (XPS) and scanning electron microscope (SEM). The nano-scale FeF 2 (s) and Fe(s) were deposited on Pt electrode in hydrofluoric acid solution with pH 2.3 and pH 2.89, respectively. The reduction of Fe(III) to Fe(0) was investigated by cyclic voltammetry, chronopotentiometry and open circuit chronopotentiometry. This reduction was a quasi-reversible process which was controlled by diffusion. The temperature dependence of the diffusion coefficient was established as lnD = −9.84 − 1805.43/ T and the activation energy value of the diffusion process was calculated to be −15.01 kJ mol −1 . The relationship between the Gibbs energy of intermetallic Fe-Pt formation and the temperature was established to be Δ G = −487.53 + 0.936 T . The hydrofluoric acid after the electrodeposition could be recycled for the leaching of the ultrafine NdFeB waste again.
研究领域:
材料科学
·
环境工程
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）