RSC Advances
·
2014
·Vol. 4
·期 76
·40352-40358
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IF 3.708
Xing Li,Yong-De Yan,Mi-Lin Zhang,Yun Xue,Hao Tang,De-Bin Ji,Zhi-Jian Zhang
The electrochemical reduction of Nd(III) was investigated on an inert W and a liquid Al electrode in molten NaCl–KCl eutectic salt. On both W and liquid Al electrodes, the reduction of Nd(III) ions to Nd(0) metal occurred in a single reaction step, which avoids the corrosion reaction: 2Nd(III) + Nd → 3Nd(II). Therefore, corrosion of Nd metal in this molten chloride media is not expected. The co-reduction behavior of Nd(III) and Al(III) ions was studied on a W electrode in NaCl–KCl–AlCl3–NdCl3 melts. Five kinds of Al–Nd intermetallic compound were detected via cyclic voltammetry and open circuit chronopotentiometry. Intermittent galvanostatic electrolysis was employed on liquid Al electrodes to extract Nd in the form of Al–Nd alloys in NaCl–KCl–NdCl3 melts. Nd, AlNd3, Al2Nd, and AlNd phases were identified by X-ray diffraction (XRD). With the increase of electrolytic time, the content of Nd-rich Al–Nd intermetallic compounds in the Al–Nd alloy increased. The morphology and micro-zone chemical analysis of the deposits were characterized by a scanning electron microscope (SEM) equipped with an energy dispersive spectrometer (EDS), and the Al11Nd3 phase was confirmed by EDS analysis.
研究领域:
冶金学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2021
·
IF 3.712
Zhimin Zhao,Jinjia Liu,Gala Sa,Aiju Xu
In this study, the photocatalytic activity of Nd-TiO 2 photocatalysts obtained by common hydrothermal method was evaluated by practical experiments and theoretical calculations based on density functional theory (DFT). The synthesized photocatalysts were characterized by X-ray diffraction (XRD), N 2 adsorption–desorption, Fourier transform infrared spectroscopy (FT-IR), high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV–Vis diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) to study their physical/chemical properties. At the same time, the photoelectronic performance was also investigated. The photodegradation ability of as-prepared photocatalysts and the effect of Nd doped amount and photocatalysts dosage were investigated by the photodegradation of phenol (30 mg/L) under 400 W metal halide lamp (UV–Vis). The effect of Nd on electronic properties of TiO 2 and adsorption ability of phenol were discussed. Results show the red-shift wavelength of 0.5 mol%Nd-TiO 2 , indicating that its absorption capacity is stronger than pristine TiO 2 in the same wavelength range. The result of DFT calculations demonstrates that the optical bandgap of Nd-TiO 2 is profoundly reduced, thus the light absorption ability is promoted, which will be responsible for the enhanced photocatalytic performance of Nd-TiO 2 . 0.5 mol% Nd is an optimum value for photodegradation phenol, and phenol can be completely degraded by 0.5 mol%Nd-TiO 2 for 210 min, the higher catalytic performance is derived from the efficient separation of e – /h + pairs. Moreover, the adsorption energy calculations of phenol on TiO 2 (101) and Nd-TiO 2 (101) demonstrate that the Nd doping can significantly enhance the adsorption ability of phenol on catalyst surfaces because of the formation of Nd–O bonds. At last, the stability measurement through four recycles exhibits that 0.5 mol%Nd-TiO 2 possesses excellent stability.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
TALANTA
·
2022
·
IF 6.556
Heng Yan,Xuemei Liu,Fan Zhang,Kaiqiang Ma,Xuepeng Shao,Fengcheng Wu,Jun Han,Wenting Bu,Chuting Yang,Liangbin Li,Sheng Hu
U, Sr, Pb, Nd, and Hf isotope ratios can provide basic and important information of nuclear materials. We established a simple and efficient column chemistry method using nano-NaBiO 3, as both oxidizer and adsorbent, to completely separate Ce from rare earth elements (REEs). This new method exhibited a high decontamination (Ce/Nd < 10 −5 ) ability and was easy to conducted, thereby providing clear advantages compared to traditional liquid–liquid and solid phase micro-extraction techniques. Additionally, a rapid four-column separation procedure, based on Sr, TUR, Ln resins and nano-NaBiO 3 , was developed to isolate U, Sr, Pb, Nd, and Hf in ore samples. The entire procedure could be completed in 4–5 hrs. The robustness of the proposed method was demonstrated by analyzing the 235 U/ 238 U, 87 Sr/ 86 Sr, 206 Pb/ 204 Pb, 207 Pb/ 204 Pb, 208 Pb/ 204 Pb, 142 Nd/ 144 Nd, 143 Nd/ 144 Nd, and 176 Hf/ 177 Hf isotopic ratios of two certified reference materials (CRMs). The analytical results obtained using this method showed good agreement with previously published data. The feasibility of this method was extended to the determination of isotope ratios in uranium ores . The results obtained from the two samples with different regions indicated that they have different isotopic ratios information. These findings indicate the potential for the use of this new method in nuclear forensic science.
研究领域:
化学
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核科学
·
地球化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
·
2016
·
IF 1.86
Xuesong Wang,Jinbao Zhang,Yue He,Lianyuan Wang,Li Liu,Han Wang,Xuexin Guo,Hongwei Lian
Pure and Nd-doped porous In 2 O 3 nanotubes have been successfully synthesized by single-capillary electrospinning method. The SEM images displays the novel structure of Nd-doped In 2 O 3 which has pores distributed on the surface of nanotubes. The subsequent test results demonstrate that Nd-doped porous In 2 O 3 nanotubes possess excellent gas-sensing properties to formaldehyde. The response of Nd-doped porous In 2 O 3 nanotubes to 100 ppm formaldehyde is 44.6 at the optimum operating temperature of 240 °C, which is 3.6 times larger than that of pure porous In 2 O 3 nanotubes (12.5), and the response and recovery times to 100 ppm formaldehyde are 15 and 50 s, respectively.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Shuo Du,Xiaofu Guo,Jinlong Li,Mengmeng Sun,Yingjie Liu,Qing Ye,Jingtao Bi,Shizhao Wang,Fei Li,Jie Liu,Yeling Zheng,Yingying Zhao
The development of ionic liquids (ILs)-based extractants for the solvent extraction of rare earth elements (REEs) is of great importance but still faces challenges. Based on the molecular structure and thermodynamic characteristics of temperature-responsive ILs (TRILs), a design method for TRILs was developed with the COSMO-SAC solvation model and quantum chemical calculations. A novel dicarboxylate TRILs, 1,6-bis(carboxyethyl)-N,N,N’,N’-tetramethyl-1,6-hexanediamine bis(trifluoromethanesulfonyl)imide ([CM-TMHDA][Tf 2 N] 2 ) was successfully synthesized, along with dihydroxy TRILs 1,6-Bis(hydroxyethyl)-N,N,N’,N’-tetramethyl-1,6-hexanediaminium bis(trifluoromethanesulfonyl)imide ([HE-TMHDA][Tf 2 N] 2 ) and diester TRILs 1,6-Bis(ethyl acetate)-N,N,N’,N’-tetramethyl-1,6-hexanediaminium bis(trifluoromethanesulfonyl)imide ([EA-TMHDA][Tf 2 N] 2 ) reported in literatures. By combining experimental and molecular simulation analyses, the phase behavior of [CM-TMHDA][Tf 2 N] 2 and the effects of acids and inorganic salts on its phase behavior were systematically studied. Additionally, a temperature-controlled phase transition system composed of TRILs and aqueous solutions was developed for the extraction and separation of Nd(III) from aqueous solutions. The results indicated that the homogeneous extraction system constructed with TRILs reduced interfacial mass transfer resistance, significantly enhancing the extraction kinetics of Nd(III). Various experimental parameters were optimized, revealing that under the conditions of 80 °C for 30 min, the carboxylic functionalized IL achieved optimal extraction efficiency for Nd(III), reaching 56 %. After four cycles, the extraction performance of [CM-TMHDA][Tf 2 N] 2 maintained. This study provides new insights for improving the separation and extraction techniques of REEs, demonstrating substantial potential for applications in this field.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Haohao Ji,Mengmeng Xie,Yu Liu,Nianjiang Chen,Shiwei Wang,Dianzi Liu,Wenlan Gao,Haoran Wang,Yanhao Dong,Jian Zhang
The application of 3D printed transparent composite ceramics with designable gain profile in solid-state lasers has garnered increasing interest. Problems including the poor performance of slurries, defects generated in the green bodies during printing and the uncontrolled densification process between ceramics with different components have deteriorated the optical quality of transparent composite ceramics prepared by direct ink writing (DIW), leading to the limitations on the realization of high-power laser outputs. To solve this problem, a systematic investigation of Nd: YAG transparent composite ceramics was conducted throughout the fabrication process, including DIW with the capability of dual-material switching, vacuum sintering and hot isostatic pressing (HIP). First, the ceramic slurries with good printability and high solids loading were formulated by adjusting the dispersant and thickener contents. The sintering behaviors of undoped YAG and Nd: YAG ceramics were investigated to enhance the optical quality of transparent composite ceramics. The Nd ions diffusion distances of the interface between undoped YAG and Nd: YAG regions in the vertical and horizontal composite ceramics were tested and calculated to be 50.1 μm and 43.5 μm, respectively. Finally, the laser measurement of the YAG/0.3 at. % Nd: YAG/YAG transparent composite ceramic with the dimension of 3 × 3 × 4 mm 3 indicated that the maximum output power of 2.15 W with the slope efficiency of 40.2 % was achieved at the absorbed pump power of 5.70 W.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Kexin Lv,Hengcheng Wan,Yi Li,Shengtai Zhang,Qiang He
The garnet structure Y 3 Fe 5 O 12 (YIG) possesses a high immobilization capacity for actinides. However, the related research on the sensitivity of garnet structures to irradiation damage is still in its infancy. Herein, we synthesize Y 3-x Nd x Fe 5 O 12 (x = 0.1, 1.8) ceramics and irradiate them with 2 MeV α-particle irradiation to fluences ranging from 1 × 10 14 to 1 × 10 17 ions/cm 2 at room temperature. We evaluated the effects of irradiation damage on the phase transition and chemical stability. An amorphous layer with a thickness of 84 nm is formed by irradiation, though the grain shape and element distribution remain uniform after irradiation. In addition, Y 3-x Nd x Fe 5 O 12 (x = 0.1, 1.8) ceramics exhibit excellent chemical stability (∼ 10 −5 g m −2 · d −1 ) in the leaching process. Restricted by the topological structure of garnet, the increase in solid solubility does not lead to a change in the radiation tolerance of the garnet structure, which means that garnet of different compositions should have similar and predictable radiation tolerance.
研究领域:
材料科学
·
核科学
·
固体物理
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Jixiang Yue,Lichun Cheng,Jilei Xiong,Qingrong Yao,Man Wang,Yucheng Chen,Qianxin Long,Xiaojian Guo
A simple composite Sr 1– x Nd x MnO 3 ( x = 0, 0.05, 0.1, 0.15, 0.2) nano powders were successfully prepared by the sol–gel method as a light-weight broadband electromagnetic wave absorber. The effect of Nd 3+ doping on the structure, microstructure and properties of SrMnO 3 was investigated. It is found that with the doping of Nd 3+ , the space group of the SrMnO 3 changes from p 63/ mmc to pm 3 m , and the crystalline shape starts to change from hexagonal to cubic crystalline. Scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) tests confirm that the particle sizes of the sample decrease and the specific surface area increases, which are attributed to the inhibition of grain growth after Nd 3+ is doped. X-ray photoelectron spectroscopy (XPS) shows that after Nd 3+ doping, the content of oxygen vacancy increases, and Mn 4+ converts to Mn 3+ . Due to the defects of the materials, the polarization effect is enhanced, thus, the dielectric and magnetic properties of the doped samples are improved. The maximum reflection loss of the Sr 0.85 Nd 0.15 MnO 3 is −33.41 dB at 7.84 GHz for a thickness of 2.4 mm, while Sr 0.9 Nd 0.1 MnO 3 has the best bandwidth performance at 2.32 GHz with a reflection loss below −10 dB.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2016
·
IF 2.29
Zhang Peng,Dong Linfei,Zhang Dongxiang,Lei Shi,Hongmei Yang,Jinying Li,Wang Yaling,V.V. Tarasov
Calix[4]arene derivatives including diethyl phosphite groups were used for the first time for separating Nd(III) from nitrate media. Calix[4]arene derivatives were synthesized and characterized by infrared spectroscopy (IR), mass spectroscopy (MS), and 1 H NMR. Four calix[4]arene derivatives, CalixF (①), DCalixF (②), PCalixF (⑤), and POCalixF (⑥), were used in a solvent extraction method. The effects of aqueous acidity, diluent, temperature, shaking time, and Nd(III) concentration were investigated. The results showed that the extraction ability of ⑤ and ⑥ with a phosphate functional group at the upper rim were best for the extraction of Nd(III). Derivative ⑥ had better complexing capacities than ⑤ for the generation of a phenolic hydroxyl group at the lower rim. The enthalpy (∆ H O ), Gibbs free energy (∆ G O ), and entropy (∆ S O ) changes for the extraction were obtained from a thermodynamic study. The results showed that the extraction of Nd(III) from a nitric acid system might be an endothermic reaction since the process was naturally spontaneous and increasing the temperature during extraction was determined to be thermodynamically feasible. The extraction of Nd(III) was governed by a two-stage chemical reaction and diffusion process. In the first stage, the process was controlled by a fast chemical reaction at the liquid-liquid interface. The composition of the Nd(III)-calix[4]arene derivative complex was determined to be [Nd(NO 3 ) 3 ] 2 [L]. The second stage was the diffusion of extracted products towards equilibrium. Calix[4]arene derivative ⑥ was found to be an efficient extractant for the separation of Nd(III) and would be a potential extractant for the disposal of radioactive waste in spent fuel .
研究领域:
化学
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核能科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Xiaolei Song,Congzhu Xu,Yuyan Wang,Huizhen Ke,Yonggui Li,Qufu Wei,Xinqun Feng
High magnetic protective fabrics with rare earth Nd doped Fe 3 O 4 nanoparticles were fabricated via a grafting method. The structure, crystal form, and elemental composition of nanoparticles were investigated by transmission electron microscopy, energy dispersive X-ray, X-ray powder diffraction, and X-ray photoelectron spectroscopy. The obtained NdFe 2 O 4 nanoparticles show spherical shape with fine dispersion and reasonable element composition. However, they demonstrate fine superparamagnetic properties with a magnetic saturation value of 29.25 A m 2 /g and low coercivity of 1.902 mT through the vibrating sample magnetometry technique, which can be well developed in magnetic shielding protective applications. Then, the cotton fabrics with plain weave were finished by a proofing rapier loom as a carrier. The NdFe 2 O 4 nanoparticles underwent some appropriate surface modification and then were grafted onto the cotton fabrics by a bridge agent of N , N ′-dissuccinimidyl carbonate. The morphology, structure, dispersion effect, and electromagnetic protective properties of the fabrics were observed through scanning electron microscopy, Fourier infrared spectroscopy, thermogravimetric analysis-differential scanning calorimetry (TG-DSC), and a vector network analyzer. The reliable fabrics with grafting reaction on the interface are expected to have potential applications in the field of electromagnetic protection and biomedicine fields.
研究领域:
材料科学
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电磁学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2015
·
IF 2.752
Chang Su,Yongcun Zou,Xiaofeng Xu,Li Liu,Zhen Liu,Lili Liu
Pure and Nd-doped porous α-Fe 2 O 3 nanotubes were successfully synthesized via a facile single-capillary electrospinning method, followed by calcination treatment. The morphologies of the as-prepared samples were characterized by scanning electron microscopy. The crystal structures and components were determined by X-ray diffraction and energy-dispersive X-ray spectroscopy, respectively. The gas-sensing properties of the as-prepared samples were studied, and the results indicate the ultrahigh sensitivity of Nd-doped porous α-Fe 2 O 3 nanotubes to acetone. The response of Nd-doped porous α-Fe 2 O 3 nanotubes to 50 ppm of acetone is about 44 at an operating temperature of 240 °C, which is 17 times larger than that of pure porous α-Fe 2 O 3 nanotubes. Furthermore, the lowest detection limit of acetone is 500 ppb, with a response of 2.4. The response and recovery times to 50 ppm of acetone are about 19 and 50 s, respectively. In addition, the Nd-doped porous α-Fe 2 O 3 nanotubes possess good selectivity and long-term stability.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2014
·
IF 3.209
Jimin Du,Zhiyong Wang,Guoyan Zhao,Yongteng Qian,Huijuan Chen,Jie Yang,Xinghui Liu,Kaidi Li,Chenxi He,Weimin Du,Imran Shakir
Herein, we report a facile route of synthesis that includes sol–gel method followed by the high temperature calcination with the aim to synthesize porous Sn/Nd-codoped TiO 2 monoliths with crystallized anatase walls using polystyrene spheres as template. Our results showed that both Sn and Nd dopant were well dispersed in the host matrix of the final product. Moreover, this as-synthesized porous Sn/Nd-codoped TiO 2 composite showed relatively narrow band gap compared to the pure anatase phase of TiO 2 , which may have its origin from the contributions from the Sn 4+ and Nd 3+ impurities. Interestingly, beside the narrowing of band gap in the codoped TiO 2 , the doping also have a positive effect to help reduced the charge recombination rate, which can be seen from the enhanced lifetime of photogenerated electrons/hole pairs. Finally, the photocatalytic activity of this interesting porous Sn/Nd-codoped TiO 2 monolith was examined by carrying out the dye degradation experiments on methyl orange under UV–vis irradiation. The porous Sn/Nd-codoped TiO 2 monolith showed better catalytic activity than the pure TiO 2 and Degussa P25 due to its narrow band gap, reduced photoinduced h + /e − pair recombination rate, and relatively large surface area. The synergistic combination of doping and surface area enhancement (porous structure) can be adopted as a promising material design strategy to develop photocatalyst materials for degradation of organic pollutants.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）