Processes
·
2025
·Vol. 13
·期 10
·3203
·
IF 2.8
Kaster Kamunur,Olesya Tyumentseva,Lyazzat Mussapyrova,Aisulu Batkal,Ardak Karagulanova,Rashid Nadirov
Coal ash represents an abundant secondary resource of rare earth elements (REEs), but their recovery is hindered by low concentrations in leachates and the presence of large amounts of competing matrix elements such as Fe, Al, Ca, and Mg. In this study, a stepwise pH-controlled precipitation approach was applied to real sulfuric acid coal ash leachates for selective recovery of Ce and La. The process combined impurity scrubbing, oxidative precipitation of Ce, and phosphate precipitation of La. Nearly complete recovery was achieved, with >95% of both Ce and La recovered and >99% phase purity. Selectivity analysis further demonstrated strong discrimination of REEs over matrix elements, with Ce showing >400 selectivity over Fe, Al, and Ca, and La showing ~170 over the same ions and ~17 over Ce. These results show the efficiency of the approach under realistic multi-element conditions.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Keyi Sun,Yuxuan Liu,Wenbin Fei,Yian Wang,Huazhang Guo,Kexin Rao,Mengting Deng,Yulei Sui,Ling Wu
Na 4 MnCr(PO 4 ) 3 , a manganese-based NASICON-type phosphate cathode material, is attracted considerable attention due to its high voltage and energy density. However, its practical application is hindered by poor electronic conductivity and inferior sodium ion diffusion kinetics. In this study, trace La 3+ is utilized to optimize the lattice structure of Na 4 MnCr(PO 4 ) 3 due to its unique energy level structure. La 3+ doping significantly enhances the local environment of the Mn-O bond and stabilizes the lattice structure by improving covalency, thereby mitigating Mn dissolution during charge–discharge cycles. Additionally, the large ionic radius of La 3+ promotes the sodium ion transport kinetics by expanding the cell volume and facilitating rapid sodium storage. As a result, the optimal Na 4 MnCr 0.995 La 0.005 (PO 4 ) 3 /C sample demonstrates an impressive initial discharge specific capacity of 124.5 mAh g −1 at 0.1C and superior cycling stability with a capacity retention of 70.2 % after 500 cycles at 5C. Furthermore, density functional theory calculations indicate that La 3+ doping can enhance conductivity and reduce the energy barrier for sodium ion diffusion. This study presents an effective and cost-efficient doping strategy for modifying high-energy density NASICON-type phosphate cathode materials, showing promising potential in the field of sodium ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机固体化学
·
计算材料学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·Vol. 48
·期 47
·17957-17969
·
IF 7.2
Wei Zhang,Dongliang Zhao,Jun Li,Zeming Yuan,Shihai Guo,Yan Qi,Yanghuan Zhang
Ball milling the powders of Mg-based alloys with transition metal compounds is effective for improving their hydrogen storage performances. In this experiment, the alloys of La 1.7 Y 0.3 Mg 16 Ni + x wt.% TiF 3 ( x = 0–10) were prepared through mechanical milling technology. XRD , SEM , HRTEM and granulometry were used to measure the composition and microstructure of alloys. The isothermal hydrogen storage property was measured by a Sievert apparatus. The results reveal that the TiF 3 additive in ball-milled samples transforms into MgF 2 and TiH 2 after the first hydrogen absorption . Adding TiF 3 enhances the crystallinity and reduces the average particle and crystallite sizes of alloys, which is beneficial to accelerating hydriding and dehydriding kinetics. Adding 7 wt% TiF 3 into alloy decreases the dehydrogenation activation energy from 72.2 to 64.0 kJ/mol and improves the hydrogen absorption rate at low temperatures, absorbing 3.50 wt% H in 0.5 min at 323 K.
研究领域:
材料科学
·
氢能
·
金属合金
·
机械球磨
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2018
·
IF 6.759
Hong Zhang,Shuang Ni,Yongli Mi,Xiaoxiang Xu
Doping techniques generally serve as effective means for tailoring the physicochemical properties of a target compound. In this work, we successfully co-doped La/Fe into Ruddlesden-Popper (RP) compound Sr 2 TiO 4 and performed a detailed investigation on the crystal structure, morphology, optical absorption and photocatalytic hydrogen production reactions after doping. Our findings suggest that La/Fe co-doping slightly expand the unit cell of Sr 2 TiO 4 while maintains the structure lamination. Incorporating La/Fe into Sr 2 TiO 4 efficiently reduces the band gap and the level of band gap reduction can be controlled by varying the amounts of dopants. La/Fe co-doping significantly improves the photocatalytic properties of Sr 2 TiO 4 under both full range (λ ≥ 250 nm) and visible light illumination (λ ≥ 420 nm). A fivefold enhancement in hydrogen production rate (∼106.2 μmol/h) is seen in sample Sr 1.9 La 0.1 Ti 0.9 Fe 0.1 O 4 (x = 0.1). Efficient photocatalytic hydrogen production under visible light illumination (λ ≥ 420 nm) is also achieved in sample Sr 1.7 La 0.3 Ti 0.7 Fe 0.3 O 4 (x = 0.3) with AQE as high as ∼1.18% at 420 nm. DFT calculations confirm the critical role of Fe in reducing the band gap of Sr 2 TiO 4 by forming additional spin-polarized bands (SPB). The anisotropic charge transportation in Sr 2 TiO 4 is also verified by our calculations as both conduction band minimum (CBM) and valence band maximum (VBM) are buried in TiO 6 octahedron layers. The 2D charge transportation properties are particularly useful for photocatalytic reactions since interlayer charge recombination is essentially prevented.
研究领域:
材料科学
·
光催化
·
能源材料
·
固态化学
✓ 已验证
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2026
·
IF 5.7
Yingyun Li,Ruizhu Li,Na Gao,Tao Li,Jian-Qiang Wang,Guoping Xiao
Sluggish catalytic activity and long-term stability of oxygen electrode materials are the main challenges in the commercialization of solid oxide fuel cells (SOFCs). Herein, a Ruddlesden-Popper-structured Pr 2-x La x NiO 4+δ (PLxN) by A-site lanthanum doping are investigated to enhance catalytic activity and stability of oxygen electrodes. Interestingly, the PL 0.1 N electrode exhibits low polarization resistance of 0.090 Ω cm 2 at 800 °C, with 18.18% reduction compared to PNO. Furthermore, the Pr 1.9 La 0.1 NiO 4+δ in anode-supported single cells exhibit peak power density of 1.468 W cm −2 at 800 °C and good operational stability over 100 h. Thereinto, La-doping induces lattice expansion and charge redistribution, which enriches surface active sites and accelerates oxygen reduction reaction kinetics. Overall, trace La-doping serving as an A-site defect engineering provides an efficient design strategy for high performance SOFC cathodes.
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Yuhang Cao,Xuewei Wu,Biqing Li,Xia Tang,Xueran Lin,Pengfei Li,Hang Chen,Fu Huang,Chaohai Wei,Jian Wei,Guanglei Qiu
Adsorption showed advantages in removing phosphorus (P) at low concentrations. Desirable adsorbents should have sufficiently high adsorption capacity and selectivity . In this study, a Ca–La layered double hydroxide (LDH) was synthesized for the first time by using a simple hydrothermal coprecipitation method for phosphate removal from wastewater. A maximum adsorption capacity of 194.04 mgP/g was achieved, ranking on the top of known LDHs. Adsorption kinetic experiments showed that 0.02 g/L Ca–La LDH could effectively reduce PO 4 3– P from 1.0 to <0.02 mg/L within 30 min. With the copresence of bicarbonate and sulfate at concentrations 17.1 and 35.7 times of that of PO 4 3– P, the Ca–La LDH showed promising selectivity towards phosphate (with a reduction in the adsorption capacity of <13.6%). In addition, four other (Mg–La, Co–La, Ni–La, and Cu–La) LDHs containing different divalent metal ions were synthesized by using the same coprecipitation method. Results showed much higher P adsorption performance of the Ca–La LDH than those LDHs. Field Emission Electron Microscopy (FE-SEM)-Energy Dispersive Spectroscopy (EDS), X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Fourier Transform Infrared Spectroscopy (FTIR), and mesoporous analysis were performed to characterize and compare the adsorption mechanisms of different LDHs. The high adsorption capacity and selectivity of the Ca–La LDH were mainly explained by selective chemical adsorption, ion exchange, and inner sphere complexation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
·
2022
·
IF 2.719
Xiaoli Song,Yuxiu Fu,Yaming Pang,Liguo Gao
La and Zn species were used to modify HZSM-5 zeolite, which was used to treat phenol in wastewater. Through the combination of multiple direct tools, La and Zn species were successfully loaded into the HZSM-5 zeolite. La-Zn/HZSM-5 zeolite has a small band gap and the catalyst can produce highly active electrons and electron holes when energy enters. The HZSM-5 zeolite after modification improves activity and stability of the catalyst. Therefore, it has a significant effect in the phenol removal experiment. Adding 1.2 mL of hydrogen peroxide and 0.11 g of catalyst, the removal rate can reach 99.38 % after being irradiation with a mercury lamp at 60 °C for 180 min. La-Zn/HZSM-5 zeolite has great potential in the application of photocatalytic degradation of phenol.
✓ 已验证
产品关联
DOI
高影响因子
Open Life Sciences
·
2022
·Vol. 17
·期 1
·952-959
·
IF 1.311
Lei Xia,Xiaowei Song,Guanghai Yan,Jishan Quan,Guangyu Jin
This study aims to synthesize a magnetic resonance imaging (MRI) contrast agent that can specifically target the asialoglycoprotein receptor of liver cancer cells and evaluate its ability as a targeted MRI contrast agent. Lactobionic acid (LA) and polyethylene glycol (PEG) were used to modify superparamagnetic iron oxide nanoparticles (SPION) to obtain LA-PEG-SPION. LA-PEG-SPION was uniformly spherical under the electron microscope, with regular morphology and good dispersion. The particle size of LA-PEG-SPION was about 30 ± 4.5 nm, and its surface potential was about 31 ± 1.5 mV. LA-PEG-SPION had no toxicity or low toxicity to HepG2 cells and HeLa cells, even at 400 μg/mL. The uptake of LA-PEG-SPION by HepG2 cells was higher than that of SPION, with increased blue-stained particles. The fluorescent labeling rate of HepG2 cells reached 68.8%, which was higher than that of the control group. In vitro, MRI showed that the T2-weighted signal intensity of HepG2 cells was lower than that of the control group. Conclusively, LA-PEG-SPION nanoparticles are synthesized in a simple and efficient way. They are successfully applied to the T2-weighted contrast-enhanced MRI in liver cancer in vitro , and they have the potential to be used for in vivo research and clinical studies.
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Ziyu Zhao,Yawen Liu,Shenghui Wang,Zhehao Hu,Tingyi Huang,Meng Yu,Xin Chen,Cong Jiang,Qianwei Liang,Jianqiang Hu
Developing efficient and low-cost electrocatalysts to substitute noble metals is crucial for oxygen evolution reaction (OER). Herein, we successfully synthesized hollow porous La-doped Co 3 O 4 dodecahedral nanoparticles (La x Co y O 4 @NC) through using ZIF-67 as precursor. Wherein, La could regulate electronic structure of Co 3 O 4 and thus promotes the OER performance efficiently. La doped Co 3 O 4 displays enhanced OER activity than pure Co 3 O 4 , as confirmed by experience results and density functional theory (DFT) calculation. Due to La doping, the ratio of Co 2+ and Co 3+ would increase obviously and generate new electronic states near the Fermi level. The La 0.17 Co 2.83 O 4 @NC exhibites excellent OER performance and high durability, which only requires an overpotential of 363 mV at the current density of 10 mA·cm −2 in alkaline medium and markedly outperforms Co 3 O 4 @NC (414 mV). These findings might provide a new strategy for controllable synthesis of transition metal nanocatalysts for high-performance OER electrocatalysis.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2022
·Vol. 29
·期 5
·1399-1410
·
IF 2.523
Zhang Xin,Chen Fei,Li Yuejin,Duan Yongzheng,Liu Guoxia
In this study, lanthanum-modified the shell–core magnetic nanocomposites with Fe 3 O 4 core and homogeneous mesoporous silica shell (La-SBA-15@Fe 3 O 4 -x) were prepared. The preparation, morphology, composition and magnetic properties of La-SBA-15@Fe 3 O 4 were investigated by TEM, SEM, XRD, VSM and BET. The results suggested that the SBA-15 have successfully encapsulated Fe 3 O 4 and the magnetic particles were decorated by lanthanum. The adsorption experiments were carried out to explore effect of La-SBA-15@Fe 3 O 4 on removal of phosphorus from aqueous solution. The kinetic study of adsorption process was investigated to describe the relationship between adsorption rate and adsorption equilibrium and the Langmuir and Freundlich isotherm models were employed to illustrate adsorption isotherm.
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Ruixin Song,Shifei Kang,Liangtao Yao,Lulu Zheng,Dechao Yu,Dawei Zhang
BiVO4 has been widely used in the field of photocatalysis due to its nontoxic and moderate band gap. However, single BiVO4 has the disadvantages of a high recombination rate of photogenerated carriers and weak response to visible light, inhibiting its photocatalytic applications. To explore viable solutions, a hybrid material composed of lanthanum-doped bismuth vanadate (La-BiVO4) and oxygen-doped porous graphite carbon nitride (O-doped g-C3N4), i.e., La-BiVO4/O-doped g-C3N4 powder, was prepared by a facile hydrothermal reaction and low-temperature calcination. Then, the powder was loaded on polyacrylonitrile nanofibers (NFs) through the electrospinning fiber technique. Various surface science characterizations, including transmission electron microscopy and nitrogen absorption and desorption analysis, confirmed the successful synthesis of a mesoporous heterojunction material. The La3+-doping as well as the porous morphologies and larger specific surface area of the O-doped g-C3N4 ultimately improve the photocatalytic abilities via a proposed Z-scheme heterojunction mechanism. The roles of La3+-doping and morphology modification in promoting the separation of the photogenerated carriers and broadening the optical absorption range were experimentally discussed. The RhB degradation experiment indicated that the La-BiVO4/O-doped g-C3N4 powder has excellent photocatalytic activity, which is about 2.85 and 2 times higher than that of the pure BiVO4 and O-doped g-C3N4, respectively. Meanwhile, the La-BiVO4/O-doped g-C3N4 NF shows good stability and recoverability after a 10-cycle testing. Such a hybrid photocatalyst with a proposed Z-scheme heterojunction mechanism and good plasticity might pave a feasible way to fabricate a new library of photocatalysts.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Ting Deng,Kuibao Zhang,Kui Liu,Jianjun Zeng,Daimeng Chen,Haiyan Guo
In this study, a series of transparent ceramics with chemical composition of La 1+x Yb 1+y Zr 2 O 7 (x, y = 0.1−0.5) were successfully prepared by vacuum sintering using combustion synthesized powders. The effects of excess contents on the phase composition, microstructure and in-line transmittance have been studied. The detailed results indicate that the in-line transmittance increases at first and then decreases as La content be elevated. It was also determined that the highest in-line transmittance of La 1+x Yb 1+y Zr 2 O 7 (x, y = 0.1−0.5) ceramics is 84.1 % at 1100 nm when the excess amount of co-doped La-Yb is 30 %. Compared with stoichiometric LaYbZr 2 O 7 ceramic, the nonstoichiometric La 1+x Yb 1+y Zr 2 O 7 (x, y = 0.1−0.5) ceramics exhibit much higher transparency. In addition, the high excess amount of La, Yb and co-doped La-Yb also shows effects on the phase composition and crystal structure.
✓ 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）