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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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.
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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
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2012
·
IF 4.601
Wenlong Yin,Kai Feng,Wendong Wang,Youguo Shi,Wenyu Hao,Jiyong Yao,Yicheng Wu
The twelve quaternary rare-earth selenides Ba2MLnSe5 (M = Ga, In; Ln = Y, Nd, Sm, Gd, Dy, Er) have been synthesized for the first time. The compounds Ba2GaLnSe5 (Ln = Y, Nd, Sm, Gd, Dy, Er) are isostructural and crystallize in a new structure type in the centrosymmetric space group P1̅ of the triclinic system while the isostructural compounds Ba2InLnSe5 (Ln = Y, Nd, Sm, Gd, Dy, Er) belong to the Ba2BiInS5 structure type and crystallize in the noncentrosymmetric space group Cmc21 of the orthorhombic system. The structures contain infinite one-dimensional anionic chains 1∞[GaLnSe5]4– and 1∞[InLnSe5]4–, and both chains are built from LnSe6 octahedra and MSe4 (M = Ga, In) tetrahedra in the corresponding selenides. As deduced from the diffuse reflectance spectra, the band gaps of most Ba2MLnSe5 (M = Ga, In; Ln = Y, Nd, Sm, Gd, Dy, Er) compounds are around 2.2 eV. The magnetic susceptibility measurements on Ba2GaGdSe5 and Ba2InLnSe5 (Ln = Nd, Gd, Dy, Er) indicate that they are paramagnetic and obey the Curie–Weiss law, while the magnetic susceptibility of Ba2InSmSe5 deviates from the Curie–Weiss law as a result of the crystal field splitting. Furthermore, Ba2InYSe5 exhibits a strong second harmonic generation response close to that of AgGaSe2, when probed with the 2090 nm laser as fundamental wavelength.
研究领域:
材料科学
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固体化学
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物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
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.
研究领域:
化学工程
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材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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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.
研究领域:
材料科学
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光催化技术
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
无机化学
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物理化学
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催化
✓ 已验证
产品关联
DOI
PubMed
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 .
研究领域:
材料科学
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无机化学
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光学材料
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2022
·
IF 4.217
Yu Deng,Yi Zhang,Yigang Ding
Recovery and separation of rare earth elements was highly crucial but difficult. In this study, a well-designed new ionic liquid named as benzyltributylammonium decanedioate ([N 444Bn ] 2 [SA]) was developed to extract rare earths and separate Sm(III) from the spent SmCo magnets in acetate medium for the first time. To exhibit the superiority of acetate medium, the extraction of Nd(III) and La(III) in three different media were comparatively investigated under different conditions, including equilibrium time, initial pH of aqueous solution, rare earth concentration, extractant concentration, salting-out agent concentration and extraction temperature. The results revealed that the better extractabilities of La(III) were observed in acetate medium rather than those in chloride medium (i.e., 97.6% versus 78.6%), which may be attributed to the low-hydrated nature of acetate ions. Importantly, the back-extraction experiments indicated that 91.4% Nd(III) can be stripped from [N 444Bn ] 2 [SA] by using 1.5 mol/L HOAc, revealing the outstanding reusability of ionic liquid in the industrial separation-stripping cycles. Furthermore, the ion association mechanism was proposed to describe the extraction behavior and confirmed by the slope analysis and FT-IR characterizations in three media. In terms of the SmCoCu mixture separation, the maximal separation factor of Sm(III)/Co(II) was calculated as 3078 in simulated solution. Impressively, the recovery of Sm(III) from the actual SmCo magnets by our dicarboxylate-type ionic liquid was also successfully achieved with a recycling rate of 96.8% and a Sm(III)/Co(II) selectivity of 148, which exhibited the potential application in the separation of Sm(III) from the spent SmCo magnets.
研究领域:
化学工程
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Haiyan Chen,Haibo Xu,Yeyin Li,Zhibin Li,Xin Wang,Bo Jiang,Rongshun Lai,Wenbin Fan,Chuntao Xiang,Zhi Yang,Xiao Chi,Qiang Ma
Selective chlorination has been proven to be an energy-efficient and environmentally friendly method for recycling rare earth elements (REEs) from Nd-Fe-B waste. However, little attention has been paid to the in-depth study of Nd-Fe-B sludge chlorination until now. In this work, four isoconversion methods combined with an unreacted shrinkage core model were employed for the first time to investigate the kinetic behavior of the chlorination reaction between FeCl 3 and Nd-Fe-B sludge. Through thermodynamic calculations, TG-DSC, SEM-EDS, and XRD analysis, the chlorination process and phase transformation behavior of Nd-Fe-B sludge were elucidated. The results show that under optimal conditions (350 °C, FeCl 3 /RE=3:1, 2 h), the RE components in Nd-Fe-B sludge are selectively chlorinated to RECl 3 , avoiding the formation of REOCl, while the iron components primarily exist in the leaching residue as Fe 2 O 3 or FeOCl. And 97.32 % of REEs are selectively extracted into the leachate, while the iron leaching rate is only 4.02 %. Besides, the STA method is the most accurate, yielding E α-STA and A values of 75.01 kJ/mol and 2.6 × 10 6 min −1 , respectively. The reaction control mechanism was analyzed in three steps. In Step 1 (0.05 < α < 0.63) and Step 2 (0.63 < α < 0.75), the diffusion reaction mechanism controls the overall reaction, In Step 3 (0.75 < α < 0.95), the nucleation reaction takes over the control, which provides a good explanation for the change in E α-STA . However, the control step of the entire chlorination reaction is dominated by the internal diffusion process.
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产品关联
DOI
高影响因子
Crystals
·
2022
·Vol. 12
·期 7
·963
·
IF 2.67
Weili Wang,Shihai Miao,Dongxun Chen,Yanjie Liang
Trivalent lanthanides (Ln3+) doped bismuth-based inorganic compounds have attracted considerable interest as promising candidates for next-generation inorganic luminescent materials. Here, a series of K0.3Bi0.7F2.4(KBF) nanocrystalline particles with controlled morphology have been synthesized through a low-temperature aqueous-phase precipitation method. Using KBF as the host matrix, Eu3+, Tb3+, Pr3+, Nd3+, Sm3+,and Dy3+ions are introduced to obtain K0.3Bi0.7F2.4:Ln3+(KBF:Ln) nanophosphors. The as-prepared KBF:Ln nanophosphors exhibit commendable photoluminescence properties, in which multicolor emissions in a single host lattice can be obtained by doping different Ln3+ions when excited by ultraviolet light. Moreover, the morphology and photoluminescence performance of these nanophosphors remain unchanged under different soaking times in water, showing good stability in a humid environment. The proposed simple and rapid synthesis route, low-cost and nontoxic bismuth-based host matrix, and tunable luminescent colors will lead the way to access these KBF:Ln nanophosphors for appealing applications such as white LEDs and optical thermometry.
研究领域:
材料科学
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纳米技术
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光学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Jiayu Liao,Peixiong Zhang,Xiaochen Niu,Hong Hong,Hao Yin,Zhen Li,Yin Hang,Zhenqiang Chen
A 2 BB’ X 6 double perovskite has recently been considered as a potential substitute for lead-based halide perovskite . In particular, the lead-free Cs 2 AgInCl 6 material possesses excellent moisture and thermal stability. However, the wide bandgap of the Cs 2 AgInCl 6 host limits its optical properties . Doping with active elements is a unique avenue to endow Cs 2 AgInCl 6 with excellent optical properties . Here, a strategy is proposed to explore the efficiency of near-infrared (NIR) emissions in Ln 3+ (Ln Nd, Yb) ions doped Cs 2 AgInCl 6 microcrystal by the codoping of Sb 3+ ion for the first time. The incorporation of Sb 3+ ion emerges a new optical absorption channel at a longer wavelength (>350 nm) and reduces the electron bandgap. Under the excitation at 365 nm, Sb 3+ and Ln 3+ (Ln Nd, Yb) co-doped Cs 2 AgInCl 6 show the efficient NIR emission peaking at around 1000 nm, attributing to the effective energy transfer from Sb 3+ to Yb 3+ or Nd 3+ f-electrons. Accordingly, the photoluminescence mechanism and environmental stability of Sb 3+ and Ln 3+ (Ln Nd, Yb) co-doped Cs 2 AgInCl 6 microcrystal were also discussed in detail. This work demonstrates the availability of the Sb 3+ doping tactics to realize efficient NIR emission in Ln 3+ (Ln Nd, Yb) doped Cs 2 AgInCl 6 microcrystal.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
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