SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Maowa Zhang,Haiqing Hao,Chenxi Shi,Chongchong Chen,Guoli Zhou,Jingtao Wang,Yijun Cao,Xiangke Han
Nd is a strategic metal, but its extraction and separation process remains a challenging task. Here, ion-imprinted membranes with six-coordinated and semi-rigid imprinted nanocage structure were developed by self-assembling terpyridine monomers in the confined reduced graphene oxide (rGO) nanochannels. The obtained membranes displayed excellent Nd(III) adsorption capacity of 20.6 mg g −1 in the solution including seven rare earth elements (REEs), together with a 7.68 times higher selectivity to Y(III). Experimental measurements and theoretical calculations revealed that Nd(III) was well coordinated to the six pyridine-nitrogen in the nanocage, which showed shorter average coordination bond (0.77 Å) and stronger binding energy (-10.52 eV) than other REEs. These were mainly attributed to the rigid symmetrical crab-type architecture and specific cavity size of bis-terpyridine nanocage. Meanwhile, the limited decomposition of these metastable nanocage derived from 2D confined effect and nanochannel walls with few groups reduced the interference of groups at non-imprinted sites on selective adsorption. The excellent anti-swelling property of rGO framework endowed 7 static adsorption cycles and maintained high selectivity (K' (Nd/Y) > 7). Integrated into account the well-defined semi-rigid sites constituted by non-covalent interactions, this strategy provided a new idea for facile synthesis of imprinted sites with higher selectivity.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Ningyu Chen,Jintang Zhou,Zhengjun Yao,Yiming Lei,Ruiyang Tan,Yuxin Zuo,Wenjian Zheng,Zibao Jiao
The electromagnetic materials are featured by good magnetic permeability and dielectric constant characteristics, which are of significant importance in solving the pollution problem of electromagnetic. In this study, after the complete of the use of sol-gel method, argon gas was then introduced for calcination , and eventually a new type of MWCNTs/Ni 0.5 Zn 0.5 Nd 0.04 Fe 1.96 O 4 composites was synthesized after the above mentioned procedures. The synthesized MWCNTs were able to be adsorbed on the surface of Ni 0.5 Zn 0.5 Nd 0.04 Fe 1.96 O 4 and could form a good conductive work of 3D. Also, the effect of additional MWCNTs on microwave absorption properties of MWCNTs/Ni 0.5 Zn 0.5 Nd 0.04 Fe 1.96 O 4 composites were also observed in this study. The results indicate that the additional MWCNTs function to significantly improve the microwave absorption property of MWCNTs/Ni 0.5 Zn 0.5 Nd 0.04 Fe 1.96 O 4 . Through altering the amount of MWCNTs, the microwave attenuation performance and impedance matching coefficient of this electromagnetic materials can be effectively improved. The S2 sample presented a minimum reflection loss of −35.05 dB when its thickness reached 1.6 mm, meanwhile, the effective absorption bandwidth achieved 4.55 GHz. The prepared composites perform well in microwave absorption, which can attribute to the reasonable ratio of composites as well as its interaction with both of the magnetic and dielectric components. This research paved the way for novel ideas to be put in the electromagnetic absorption materials with high-efficient.
✓ 已验证
产品关联
DOI
高影响因子
Water
·
2020
·Vol. 12
·期 5
·1317
·
IF 2.544
Yan Zhang,Zhili Ni,Jie Yao
The electrochemical oxidation processes have attracted tremendous attention on the destruction of toxic and non-biodegradable organics. A series of neodymium (Nd)-doped PbO2electrodes (Ti/PbO2-Nd) were synthesized through a pulse electrodeposition method, and its activity of bisphenol S (BPS) removal was further examined. The morphologies and structures were characterized by the X-ray diffraction (XRD), scanning electron microscopy (SEM) and an energy dispersive spectrometer (EDS). The performance, energy consumption and mechanism of electrochemical oxidation of BPS by Ti/PbO2-Nd electrode were also discussed. Compared to the traditional Ti/PbO2electrode, the Ti/PbO2-Nd enables finer crystal particles, facilitating the oxygen evolution overpotential (OEP) from 1.41V to 1.55V and the generation of hydroxyl radicals (•OH). Moreover, lower duty cycles during the preparation of the electrode also contribute to the tapering size of crystals. The results show that the Ti/PbO2-Nd electrode exhibits relatively high activity in the anodic oxidation of BPS. Over 95% of BPS could be removed with the current density of 15 mA cm−2. Moreover, the energy consumption of BPS degradation on Ti/PbO2-Nd electrode is 60.26 kWh m−3, much lower than that on Ti/PbO2electrode (95.45 kWh m−3). To conclude, the Ti/PbO2-Nd electrode has been proven to be a promising material for BPS removal.Keywords:bisphenol S;electrochemical degradation;Ti/PbO2-Nd electrode;mechanism;duty cycle
✓ 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.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
·
2017
·Vol. 28
·期 9
·1-12
·
IF 2.325
Shuai Cijun,Yang Youwen,Peng Shuping,Gao Chengde,Feng Pei,Chen Jian,Liu Yong,Lin Xin,Yang Sheng,Yuan Fulai
Mg-5.6Zn-0.5Zr alloy (ZK60) tends to degrade too rapid for orthopedic application, in spite of its natural degradation, suitable strength and good biocompatibility. In this study, Nd was alloyed with ZK60 via laser melting method to enhance its corrosion resistance. The microstructure features, mechanical properties and corrosion behaviors of ZK60- x Nd ( x = 0, 1.8, 3.6, 5.4 wt.%) were investigated. Results showed that laser melted ZK60- x Nd were composed of fine ɑ-Mg grains and intermetallic phases along grain boundaries. And the precipitated intermetallic phases experienced successive changes: divorced island-like MgZn phase → honeycomb-like T phase → coarsened and agglomerated W phase with Nd increasing. It was worth noting that ZK60-3.6Nd with honeycomb-like T phase exhibited an optimal corrosion behavior with a corrosion rate of 1.56 mm year −1 . The improved corrosion behavior was ascribed to: (I) dense surface film caused by the formation of Nd 2 O 3 hindered the invasion of immersion solution; (II) the three-dimensional honeycomb structure of intermetallic phases formed a tight barrier to restrain the propagation of corrosion. Moreover, ZK60-3.6Nd exhibited good biocompatibility. It was suggested that ZK60-3.6Nd was a preferable candidate for biodegradable bone implant.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jinyang Li,Wenye Deng,Yan Xue,Ni Ai,Kai Ding,Xianghui Chen,Pengjun Zhao,Aimin Chang,Yongxin Xie
This study used the solid-phase method to prepare thermosensitive perovskite ceramics, La 0.9 B 0.1 AlO 3 (B = Pr, Nd, Sm). The XRD and EDS results indicated that all components presented a single phase and all elements were uniformly distributed, formed a good solid solution. The SEM results clearly illustrated that the doped elements had enhanced the surface morphology, resulting in more uniform grain formation. The TEM results showed that linear defects were present, which led to an uneven stress distribution; consequently, this enhanced the carrier transport. The alternating current (AC) impedance showed that the grain boundary resistance determined the overall complex impedance and exhibited a different conductive mechanism with increasing temperature, from polariton to ion conduction. With the introduction of Nd 3+ , the conductivity of La 0.9 Nd 0.1 AlO 3 increased and its temperature range increased from 600 – 1400 °C to 100–1500 °C. In La 0.9 Sm 0.1 AlO 3 , the presence of Sm 2+ enhances the aging stability by elevating the oxygen vacancy concentration and the aging drift rate (ΔR/R0) was found to be lower than 2 %. In addition, DFT-based calculations were performed to investigate the property changes in the crystal structure and energy band structure of pure and doped LaAlO 3 . This study demonstrated an effective way to improve the performance of high-temperature thermistor materials using different doping strategies.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 109
·期 1
·e70415
·
IF 3.8
Qing Tao,Junxia Wang,Jin Wang,Xi Zhang,Yuan Liu,Die Liu,Kunqi Liu
In this study, a series of (1- x )Sr 0.5 Zr 2 (PO 4 ) 3 - x (Ce 1-2 y Nd y Sm y )PO 4 (abbreviated as SrZP-(Ce, Nd, Sm)PO 4 , x = 0, 0.2, 0.4, 0.5, 0.6, 0.8, 1; y = 0, 1/12, 2/12, 3/12, 4/12, 5/12, 6/12) dual-phase ceramic waste forms were fabricated through a one-step microwave sintering technique. The phase evolution, micromorphology, and densification behavior of these ceramics were systematically investigated using XRD, Raman spectroscopy, SEM-EDS, and density measurement. The results confirmed that the dual-phase ceramics exclusively consisted of SrZP and (Ce, Nd, Sm)PO 4 phases, which coexisted stably and independently, enabling simultaneously effective immobilization of simulated fission products (Sr 2+ ) and actinides radionuclides (Ce 3+ , Nd 3+ , and Sm 3+ ). The ceramics exhibited a homogeneous distribution of both phases, a compact micromorphology, and relative densities achieving a maximum of 98.9%. It was demonstrated that alterations in the phase content ( x value) induced only negligible variations in the lattice parameters of both crystalline phases, indicating minimal structural perturbations. Rietveld refinement analysis revealed a gradual reduction in the lattice parameters of the (Ce, Nd, Sm)PO 4 phase with increasing y value, consistent with the anticipated immobilization of the simulated actinide radionuclides. In addition, by integrating XRD and Raman analyses, the temperature-induced phase evolution of the representative sample SrZP-Ce 1/3 Nd 1/3 Sm 1/3 PO 4 was comprehensively characterized. The results indicated that the Ce 1/3 Nd 1/3 Sm 1/3 PO 4 phase preferentially formed over the SrZP phase during the dual-phase ceramic preparation. Furthermore, the Kissinger model based on TG-DSC results at various heating rates ( β T = 10, 15, 20, and 25 K/min) provided additional thermodynamic evidence, in which the Ce 1/3 Nd 1/3 Sm 1/3 PO 4 phase possessed a lower apparent activation energy (353.35 kJ/mol) than the SrZP phase (501.33 kJ/mol). Besides, the SrZP-Ce 1/3 Nd 1/3 Sm 1/3 PO 4 dual-phase ceramic waste form demonstrated high chemical stability, with normalized leaching rates of all elements remaining relatively low ( LR Sr ∼ 10 −4 g·m −2 ·d −1 , LR Ce ∼ 10 −7 g·m −2 ·d −1 , LR Nd ∼ 10 −7 g·m −2 ·d −1 , and LR Sm ∼ 10 −6 g·m −2 ·d −1 ).
研究领域:
材料科学
·
核废料处理
·
陶瓷材料
·
固态化学
·
辐射材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 5
·2134-2142
·
IF 3.784
Yafei Liu,Zhilong Fu,Xingyu Chen,Yaxin Wei,Bo Zhang,Aimin Chang
Rare-earth ions doped Ca 0.9 R 0.1 CeNbMoO 8 ( R = Y, Sm, Nd, La) ceramics have been successfully prepared by solid-state method, and their modifications to the microstructure and electrical properties are also investigated. The rare-earth ions doped ceramics exhibit the scheelite structure. With the increase in the radius of rare-earth ions, the lattice distortion and bond interaction will be enhanced, and the consistency of grain size will be reduced. The ceramics exhibit negative temperature coefficient (NTC) thermistor characteristics in the temperature range of 473 K-1273 K, and the activation energy decreases with the increase of the radius of rare-earth ions. Rare-earth ions doping can increase the content of Ce 3+ ions and promote the conductivity of ceramics. Except for Sm 3+ -doped ceramics, the high-temperature aging rate of other ceramics is less than 2%. The existence of some metastable Sm 2+ ions in Sm 3+ -doped ceramics not only increases the activation energy, but also reduces the high-temperature stability of the ceramics.
研究领域:
材料科学
·
固态物理
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 46
·期 10
·16524-16532
·
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
·
纳米科技
·
固体物理
·
无机化学
·
功能材料
✓ 已验证
DOI
高影响因子
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.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Yilai Zhong,Zengyuan Li,Jianchun Qin,Wenlong Li,Chunlin He,Lifeng Chen,Xiangbiao Yin,Mohammed F. Hamza,Yuezhou Wei,Shunyan Ning
Recycling rare earth elements (REEs) from NdFeB magnets alleviates the growing demand for these resources and contributes to environmental protection. Phosphate groups are known for their high adsorption selectivity for rare and precious metals. In this study, a novel phosphorus-functionalized silicon-based adsorption material (PPA@APTES/SBA-15) was synthesized using poly (ethylene glycol)- block -poly (propylene glycol)- block -poly (ethylene glycol) copolymer (P123) as a template, tetraethyl orthosilicate (TEOS) as a silicon source, (3-amino-propyl) trimethoxysilane (APTES) as a coupling agent, and phosphite ester as a functional ligand. This material was designed for the adsorption and separation of Nd and Dy from NdFeB leaching simulants. The batch experiments revealed that PPA@APTES/SBA-15 achieved equilibrium separation of Co and REEs within 10 s, with SF REE/Co ≥ 2018.76. The material exhibited near 100 % adsorption efficiency for Nd and Dy in 6 M HCl solution, along with excellent reusability. Notably, column experiments also demonstrated near complete adsorption efficiency for Nd and Dy. SEM-EDS, TEM, XRD, and N 2 adsorption-desorption isotherms confirmed that PPA@APTES/SBA-15 possessed a uniform hexagonal mesoporous structure and a high specific surface area. TG-DSC analysis demonstrated that the organic loading of PPA@APTES/SBA-15 was 9 %. FT-IR, XPS, and DFT analysis suggested that PPA@APTES/SBA-15 bond metal ions via P OH (P O) groups.
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
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 .
✓ 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）