CELLULOSE
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2019
·Vol. 26
·期 9
·5571-5582
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IF 3.917
Zheng Xudong,Zhang Yi,Bian Tingting,Wang Dandan,Li Zhongyu
Previously, we investigated imprinted silica films templated by cellulose nanocrystals for the selective adsorption of rare earth ions from acidic systems, but the cost of organosilane limits the application of silica film adsorbents. Considering the cost and outstanding properties of cellulose, converting this renewable biological resource into an adsorbent material is a vital step towards sustainable development. One-step fabrication of imprinted mesoporous cellulose nanocrystals films (IMCFs) was implemented via ionic imprinting technology and they were applied to efficiently and selectively separate neodymium ions [Nd(III)]. Transmission photographs clearly demonstrated there is a highly ordered mesoporous structure after removal of silicon source. Nitrogen adsorption measurements showed two obtained materials possess high specific surface area, providing a good premise for efficient separation. When employed as absorbents, the maximum adsorption capacity of IMCFs is almost three folds than that of NIMCFs, reaching 18.22 mg g −1 . The distribution coefficient of IMCFs for Nd(III) reached 435.46 mL g −1 , much higher than other interfering ions. Repeatability tests showed IMCFs retained 81.55% of initial adsorption capacity after five adsorption cycles. In summary, this work presents a new avenue to construct imprinted mesoporous cellulose nanocrystals films for separation of rare earth ions.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Yilin Wu,Rongxin Lin,Faguang Ma,Wendong Xing,Jianming Pan
Three-dimensional (3D) basswood materials, for the first time, were successfully used for the construction of rare-earth Nd(III)-imprinted nanocomposite membranes. Herein, polydopamine (PDA)-modified layers could be initially synthesized on basswood surfaces. After the double-bonded modification procedure, the 3D wood-based ionic imprinted membranes (3DW-IIMs) system was finally accomplished by developing a re-modified two-step-temperature free radical polymerization process. The as-design PDA@basswood surface structure was first proposed and applied as imprinting-initiated factors for the preparation of Nd(III)-imprinted sites. Importantly, excellent rebinding capacity (120.87 mg g −1 ), adsorption kinetics and permselectivity coefficients (more than 10) were achieved successfully. Furthermore, an important research result had also been found that the PDA-modified layers caused significant promotions to the rebinding capacities of the as-prepared 3DW-IIMs, that is to say, more and more Nd(III)-imprinted sites could be synthesized because of the PDA-modified surfaces. The as-obtained selective rebinding and separation results together with the green natural wood-based materials strongly demonstrated that our synthesis methodology of 3DW-IIMs had great potential for applications in various fields of rare earth separation, chemical industry, and environment protection.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 6
·2521-2529
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IF 3.784
Guilin Wei,Minghe Shi,Chen Xu,Xiaoyan Shu,Fen Luo,Shunzhang Chen,Lan Wang,Yi Xie,Xirui Lu
The safe treatment of radioactive-contaminated soil is of great significance. In this work, neodymium-contaminated soil was successfully immobilized using microwave sintering to form glass-ceramics. The microstructure, morphology, elemental distribution, Vickers hardness, and chemical durability of the sintered samples were analyzed. The results showed that the glass-ceramic is more suitable to immobilize the waste compared with the glass matrix. XRD and SEM-EDS results proved that the waste form has been totally immobilized in the sintered matrix whether in glass-ceramics and glass. However, the leaching rate of element Nd in glass-ceramic was lower than the glass matrix at 28 d. Moreover, the Vickers hardness results of glass-ceramic were higher than that of glass. Thus, glass-ceramics can not only reduce sintering temperature and save energy but also achieve a better immobilizing effect. Our investigation reflects that glass-ceramics are more suitable for neodymium-contaminated soil immobilization using the microwave sintering method.
研究领域:
环境科学
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材料科学
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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
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腐蚀与防护
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产品关联
DOI
PubMed
高影响因子
OPTICS COMMUNICATIONS
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2014
·
IF 1.542
Li Hu,Jinli Zhang,Qiang Yin,Peijie Li,Kai Du
Nd(bfa) 3 (TPPO) 2 , Nd(tta) 3 (TPPO) 2 and Nd(β-nta) 3 (TPPO) 2 (bfa: 4,4,4-Trifluoro-1-phenyl-1,3-butanedione, tta: 4,4,4-Trifluoro-1-(2-thienyl)-1,3-butanedione, β-nta: 4,4,4-Trifluoro-1-naphthyl-1,3-butanedione, TPPO: triphenylphosphine oxide), three kinds of Nd(III) ternary complexes, were synthesized using β-diketonates and triphenylphosphine oxide as ligands. Fluorescence properties (including excitation spectra, emission spectra , emission lifetime, quantum yield, etc.) and thermal stabilities of the complexes were studied. Nd(tta) 3 (TPPO) 2 having the sharpest emission band, highest relative emission intensity and shortest fluorescence lifetime shows that it will be a kind of promising material for applications in near infrared immunoassay, laser active medium and optical fibers .
研究领域:
化学
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光学
·
材料科学
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2016
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IF 3.12
Shunli Liu,Mengmeng Kang,Imtiaz Hussain,Kewen Li,Fang Yao,Guodong Fu
An alginate-based, stable and high mechanical strength hydrogel was fabricated by trivalent ions coordination in the presence of neodymium Ions. The chemical components and morphology of the hydrogel were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The effects of pH values on the swelling properties of hydrogels were investigated as it reveals that the pH values have an obvious effect on the swelling ratio. The as-prepared hydrogel exhibited high compressive strength and stability, which is much higher than that of the alginate hydrogel formed by Ca 2+ ionic cross-linked. Moreover, the Nd(III)-Alg hydrogel also exhibited the properties of fluorescence. The easy and fast fabrication, outstanding mechanical and stable properties indicated the hydrogel as a promising material that can be used in cartilage tissue.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
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2022
·
IF 4.632
Yusheng Yang,Tuoyao Wang,Ran Zhao,Shuyan Zhang,Zengwu Zhao
Neodymium oxyfluoride has received much attention in the fields of anionic solid electrolytes , luminescent , catalytic and magnetic materials because of its structure combined advantages of rare-earth cations with F – and O 2– anions. In this work, neodynium oxyfluoride was synthesized by the reaction between neodymium oxide and four fluoride media with different fluoride ion activities . The synthesis processes in molten LiF–CaF 2 –NdF 3 , LiF–NdF 3 , NaF–CaF 2 -NdF 3 and NaF–KF–NdF 3 are observed in situ by a confocal scanning laser microscope. The expansion of neodymium oxide particle is observed in the LiF–CaF 2 –NdF 3 , LiF–NdF 3 , and NaF–KF–NdF 3 melts, and the growth of needle crystals on neodymium oxide particle is clearly observed in molten NaF–CaF 2 –NdF 3 . Based on scanning electron microscopy (SEM)-energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) analyses of products, neodynium oxyfluoride was successfully synthesized in the four fluoride media. The neodynium oxyfluoride generated in the LiF–CaF 2 –NdF 3 , LiF–NdF 3 , and NaF–KF–NdF 3 melts is a tetragonal structure. However, in molten NaF–CaF 2 –NdF 3 , neodynium oxyfluoride with a rhombohedral structure is formed. It is suggested that the substitution of Na(I) and Ca(II) for Nd(III) can transform NdOF from tetragonal structure to rhombohedral structure. The growth rate of needle crystals generated in molten NaF–CaF 2 –NdF 3 was calculated based on the result of a confocal scanning laser microscope, and it is found that the reaction kinetics of crystal formation is zero-order reaction. The effect of fluoride media on the structure and morphology of formed NdOF were evaluated by XRD, X-ray photoelectron spectroscopy (XPS) and SEM. The neodymium oxyfluoride prepared in the fluoride media with high fluoride ion activity has low binding energy of F 1s. The ratio of adsorbed oxygen to lattice oxygen for neodymium oxyfluoride prepared in molten LiF-NdF 3 is larger than those in the other three fluoride media, so it can have better catalytic performance.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Li Ding,Xuepeng Wang,Shanxin Yang,Wenda Xu,Yongde Yan,Yun Xue,Fuqiu Ma
In order to reveal the extraction mechanism of Nd on Ga-Al alloy electrode, the electrode reactions and alloy formation between Nd(III), Ga(III) and Al(III) ions in different molten salt systems were studied by multiple electrochemical methods. The cyclic voltammetry curves measured in melts with different concentrations confirmed that only three intermetallic compounds were formed in both Ga-Nd and Al-Nd systems. The preferential interaction of Nd with Ga in Ga-Al-Nd ternary system was further verified by cyclic voltammetry curves with varying potential window. In particular, the co-reduction process of three ions was gradually determined by the comparison of electrochemical behaviour in different melts. In addition, the interfacial reaction of Nd(III) ion on liquid Ga-Al alloy cathode was investigated, and the corresponding exchange current densities were measured through galvanostatic pulse (0.0049, 0.0047, 0.0056 and 0.0055 A cm −2 ) and Tafel method (0.0029 A cm −2 ).
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2022
·
IF 4.939
Yifeng Shi,Gerile Naren,Ying Zhang,Jiakang Han,Aorigele Bohnuud
Amino acid rare-earth complexes are widely used due to their unique physical and chemical properties. In this study, three kinds of neodymium (III) complexes with octanoyl-aminocarboxylate ligands (abbr. Nd(oct-ala) 3 , Nd(oct-phe) 3 , Nd(oct-ser) 3 ) were prepared by a chemical reaction method in methanol as the solvent. The chemical formulas and coordination modes of the neodymium complexes were determined by elemental analysis, 1 H NMR and FT-IR. Additional analyses by X-ray diffraction (XRD) and scanning electron microscopy (SEM) show that the neodymium complexes have lamellar irregular shapes and long-range disordered amorphous structures. The thermal performance of the complexes was determined by differential scanning calorimetry (DSC) and thermal gravimetry-differential thermal analysis (TG-DTA). Nd(oct-phe) 3 and Nd(oct-ser) 3 appeared glassy when heated. The solubility of the complexes in various organic reagents was also measured. The optical properties of the complexes were examined using UV–Vis absorption, polarizing microscopy observations, fluorescence spectra, quantum yield, and fluorescence lifetime. The luminescence properties of the complexes as a function of temperature were further observed by analysis of temperature-dependent emission spectra. The polarizing microscopy observations show that the three neodymium complexes exhibited the characteristic properties of thermotropic liquid crystals. UV–Vis, fluorescence spectroscopy, and quantum yield results show that they have excellent light absorption and luminescence properties. Temperature-dependent emission spectra show that the complexes have good luminescence properties in the temperature range of 25–160 °C. The powdered complexes and the complexed solutions in methanol were irradiated with 380 nm UV light, resulting in blue-violet light emission. A warm white-light device was constructed to further verify the luminescence of the complexes after combining with three kinds of rare-earth complexes (Nd(oct-phe) 3 , Eu(oct-phe) 3 , and Tb(oct-phe) 3 . The color rendering index (CRI) and color temperature (CCT) were measured. In addition, the density functional theory (DFT) was used to determine the geometric structures ( Fig S1 ), and obtain 1 H NMR, FT-IR spectra of the neodymium complexes ( Fig S2, S3 ). Their structures were further examined by comparing the calculated with the experimental spectra. The results show that the ligands coordinate to the central Nd 3+ through the bidentate chelation mode.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
材料科学
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环境化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Jiaqi Wang,Xin Ding,Tongtong Gao,Huiling Zheng,Xuejiao Wang,Qiushi Wang,Cailong Liu
Due to the characteristics of non-contact, high sensitivity and spatial resolution, nanoscale optical thermometry is necessary in many applications such as micro/nano electronics, integrated optics and biomedicine. Herein, we report the synthesis of Nd 3+ /Yb 3+ co-doped AlN (AlN:Nd 3+ /Yb 3+ ) nanorods using an arc discharge method and investigate their phase, composition and morphology using XRD, Raman, XPS, EDS, ICP, SEM and TEM. The nanorods with rectangular cross-section are highly single crystalline and have a uniform smooth surface. Upon excitation at 980 nm, AlN:Nd 3+ /Yb 3+ nanorods exhibit up-conversion (UC) visible emission bands (around 544, 595 and 667 nm) and near-infrared emission bands (around 755 and 806 nm), which correspond to intra-4f electron transitions of the Nd 3+ ions. Later, the temperature dependence of UC luminescence behavior was systemically studied using luminescence intensity ratio (LIR) technique. It was verified that LIRs with non-thermally coupled levels ( 4 G 7/2 / 4 F 5/2 or 4 G 7/2 / 4 F 7/2 ) are suitable for temperature sensing. The maximum relative sensitivity based on 4 G 7/2 / 4 F 7/2 is 4.63% K −1 at 298 K, which is one of the highest values reported for optical thermometers. This work provides an efficient method for synthesizing wide-band gap semiconductors with doped size-mismatched functional atoms that can be used for high-sensitivity optical thermometry.
研究领域:
材料科学
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光学
·
纳米技术
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jiajie Wang,Bairen Yang,Zhuqiu Sun,Qingqing Shang,Junheng Zhang
This study aimed to investigate the performance of biotrickling filters (BTFs) in the microbial degradation of m -dichlorobenzene ( m -DCB) to construct an enhanced treatment of removing m -dichlorobenzene ( m -DCB) at different concentrations of rhamnolipids (RLs) and lanthanum (La 3+ ) or neodymium (Nd 3+ ) ions. We found a significantly enhanced removal of m -DCB when 110 mg/L of RLs and 0.2 mg/L La 3+ or 0.4 mg/L Nd 3+ ions were added. The addition of RLs and La 3+ or Nd 3+ ions increased the m -DCB average removal efficiency (101–110 days) by 19.7% and 22.7%, respectively, when the inlet m -DCB concentration was 800 mg/m 3 and the empty bed residence time (EBRT) was 60 s. Further, the mechanisms that strengthened the mass transfer were the decrease of contact angle, surface tension, and Henry’s constant after the addition of RLs and La 3+ or Nd 3+ ions in the nutrient solution; further, we noticed a significant increase in the dissolved oxygen levels. Improvements in the performance of BTFs were associated with enhanced microbial community and an increased abundance of functional genes. In conclusion, the addition of RLs and La 3+ or Nd 3+ ions can enhance the performance of BTFs in degrading m -DCB by improving mass transfer and microbial activity simultaneously.
研究领域:
环境科学
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微生物学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）