ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Baojia Qin,Yusen Wu,Ruijun Qiu,Jujun Ruan
For sustainable development of resources, pyrometallurgy, hydrometallurgy, and bioleaching have been widely employed in the recovery of waste lithium-ion batteries. Metallic resources have been successfully recovered by these technologies. However, high-value and comprehensive utilization technology of waste lithium-ion batteries is still in its infancy. In this paper, a combined technology of material molecular design and vacuum gasification deposition to prepare high-value optical materials (La-doped LiAl5O8) from the electrode materials of waste lithium-ion batteries is reported. The band gap of the designed La-doped LiAl5O8 was reduced by 1.077 eV compared to that of LiAl5O8. The La-d state caused a blue shift in the spectrogram so that the material can be excited by lower energy light. La-doped LiAl5O8 was successfully prepared by vacuum gasification deposition, and its strongest emission peak was at 450 nm. Photoluminescence intensity of La-doped LiAl5O8 was twice that of LiAl5O8. Chromaticity of the recovered La-doped LiAl5O8 was located at (0.17, 0.15), which indicated that La-doped LiAl5O8 was a highly efficient blue-emissive material and had great potential application in light-emitting diodes. This paper contributes to a new strategy in the value-added recovery of solid waste.
研究领域:
材料科学
·
资源回收
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2022
·Vol. 19
·期 22
·14835
·
IF 4.614
Jinkai Shu,Bozhi Ren,Wei Zhang,An Wang,Sen Lu,Shuyu Liu
Modified Shell Powder/La-Fe-TiO2(La-Fe-TiO2@MSP) composites were fabricated using the sol-gel method and characterized by SEM, XRD, UV-vis DRS and photocurrent techniques, and their physicochemical and optical properties were analyzed. The effects of various factors on the photocatalytic degradation of pyridine and its reaction kinetics were investigated by batch experiments using pyridine, a typical nitrogen-containing heterocyclic compound in coal chemical wastewater, as the target removal species. The pyridine degradation rate of 80.23% was obtained for 800 mg/L composite solution by photocatalytic oxidation of 50 mg/L pyridine wastewater for 180 min at 35 °C, pH = 8 and light intensity of 560 W. The photocatalytic degradation performance was optimal. The quenching experiments determined that the active species of photodegradation were mainly hole and hydroxyl radicals, and the photocatalytic degradation mechanism was analyzed in this way.Keywords:La-Fe-TiO2@MSP;photocatalysis;pyridine;reaction kinetics
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2019
·
IF 7.723
Siquan Feng,Xiangsong Lin,Xiangen Song,Yang Liu,Zheng Jiang,Yunjie Ding
Heterogeneous single-site catalysts are ideal alternatives to their homogenous counterparts. Methanol carbonylation to produce acetic acid is a typical homogeneous catalytic process. Here, we investigate the stability of a heterogeneous single-site catalyst for vapor methanol carbonylation constituted by an Ir–La binuclear complex on activated carbon (Ir 1 -La 1 /AC). Through the structure of the binuclear complex on the Ir 1 -La 1 /AC catalyst, the La promoter could protect the Ir + species from reduction by H 2 , favor the single-atom dispersion of Ir metal, and also increase the reaction rate of methanol carbonylation. Furthermore, the apparent activation energy of the Ir 1 -La 1 /AC catalyst was 12.2 kJ/mol lower than that of the Ir 1 /AC catalyst. A density functional theory calculation showed that reductive elimination of acetyl iodide was the rate-determining step for the Ir 1 /AC catalyst, leading to a severe carbon deposition problem, while CO migration insertion was believed to be the rate-determining step on the Ir 1 -La 1 /AC catalyst, which can reduce the carbon deposition to a great extent.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
Materials Today Sustainability
·
2024
·
IF 7.1
Jie Zhu,Tongxin Qu,Shengli Niu,Jisen Liu,Sitong Liu,Jie Geng,Zihao Yang,Abulikemu Abulizi
The development of reusable heterogeneous catalysts with acid-base bifunctions employing low-cost oil as a raw material is critical for optimizing the biodiesel synthesis process. In the present study, Sr–La/wollastonite bifunctional catalysts with the different Sr/La atomic ratios are synthesized using a straightforward impregnation technique. The results show that the Sr 7 La 3 /wollastonite catalyst establishes a biodiesel yield of 95.35% upon initial use and 85.14% after the fifth cycle of reuse, under the transesterification conditions of a catalyst content of 8 wt.%, methanol to oil molar ratio of 15, reaction duration of 3 h, and reaction temperature of 150 °C. The biodiesel yield of 91.62% is obtained even after the addition of 5 wt.% oleic acid, and the catalyst maintains a high biodiesel yield (>80%) for three reused cycles, which illustrates the good resistance to free fatty acids (FFAs). Meanwhile, the process parameters for transesterification are optimized utilizing Response Surface Methodology combined with Box-Behnken Design (RSM-BBD). With a methanol to oil molar ratio of 17.7 and a catalyst content of 6.4 wt.%, biodiesel yield is 96.08% at 149 °C for 3 h. This study revealed the enormous potential of the Sr–La/wollastonite bifunctional catalyst in biodiesel production.
研究领域:
化学工程
·
催化材料
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Xiaoyun Shang,Xiangming Wang,Min Chen,Haoran Tu,Hongguo Zhang,Ming Yue,Xiaobo Du
To balance the utilization of rare-earth resources and reduce the preparation cost, the La and Ce substituted Nd 2 Fe 14 C hard magnetic alloys were prepared by a facile mechanochemical method for the first time. A two-step process is typically employed: 1) Decomposition of hydrocarbon and disproportionation of (Nd 1-x RE x ) 2.5 Fe 14 B 0.08 (RE=La or Ce, x=0–0.3) alloys during high-energy ball milling, Nd+Nd 2 Fe 17 +n-hexane→NdH 2+δ +α-Fe+Fe 7 C 3 ; 2) (Nd, RE) 2 Fe 14 C hard magnetic powders were obtained via the vacuum annealing at 800 °C for 2 min. The phase relation, magnetic properties and microstructural evolution of (Nd, RE) 2 Fe 14 B 0.08 C 0.92 (named Nd-RE-Fe-C-based) alloys were systematically investigated. Substitution of La for x=0.1 Nd in the Nd-RE-Fe-C-based alloy increase the coercivity from 15.6 kOe to 18.6 kOe without reducing the remanence. First-principles calculation was performed to study the mechanism of magnetic properties La and Ce substituted samples. The results showed that La tends to be expelled from 2:14:1 phase to form more minor phases which act as the domain wall pinning center, increasing the coercivity. However, Ce prefers to enter the 2:14:1 phase, diminishing the permanent magnetic properties due to the poor intrinsic magnetic properties. This paper provides a novel viewpoint for the effective utilization of high abundant rare earth and the investigation of low cost Nd 2 Fe 14 C permanent magnet materials.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Fang He,Dashuang Fu,Yunkai Wu,Xu Wang
Lead-free dielectric capacitors have become a topic of great interest in response to the ever-increasing demand for high-performance and environmentally friend energy devices. As SrTiO 3 (STO) is paraelectrics, the extremely low spontaneous polarization limits the development of its energy storage applications. In this paper, the microstructure and ferroelectric properties of STO are adjusted by grain engineering to expand its application in energy storage. STO, SrTi 1-x Mn x O 3 (STM x , x = 0.01 and 0.04) and Sr 1-y La y TiMn 0.01 O 3 (SL y TM 0.01 , y = 0.01, 0.02, 0.03 and 0.04) thin films are synthesized by the sol-gel method and thoroughly investigated on the effects of A-site (La) and B-site (Mn) co-doping effects on the crystalline phase, morphology, dielectric, ferroelectric and energy storage characteristics of STO thin film. The results indicate that the SL 0.01 TM 0.01 thin film exhibits a breakdown electric field of 3666.2 kV/cm. The SL 0.02 M 0.01 thin film exhibits excellent frequency stability and low dielectric loss (<0.01) with an energy storage density of 29.5 J/cm 3 and an efficiency of 83.7 % at 2600 kV/cm. Moreover, the sample shows good frequency stability (400–2800 Hz) and thermal stability (20−140 °C). These findings indicate the potential of (Mn, La) co-doped SrTiO 3 thin film for dielectric capacitor energy storage field applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Haidong Luo,Shuai Dong,Suhang Chen,Fengqi Zhao,Kangzhen Xu
Photocatalytic-Fenton synergistic degradation of pollutants in wastewater is considered a promising technology for environmental treatment. Herein, FeOOH quantum dots decorated La-doped Bi 4 O 5 I 2 hybrids were prepared using an in-situ deposition strategy and applied for the removal of 2,4-dinitrophenylhydrazine. The FeOOH-1/La 10 -Bi 4 O 5 I 2 sample exhibits the highest catalytic activity in degradation experiments, eliminating 93.8 % of 2,4-dinitrophenylhydrazine within 30 min at a reaction rate constant of 0.117 min −1 . In addition, the impacts of several operational parameters on the catalytic activity were comprehensively examined, including H 2 O 2 concentration, catalyst dosage, reaction solution pH and co-existing ions. In degradation process of 2,4-dinitrophenylhydrazine, the major reactive oxygen species are ·OH and ·O 2 – , with ·OH generated by Fenton reaction. Optical property characterization, cyclic voltammetry tests, and photoelectrochemical measurements confirmed that the FeOOH-1/La 10 -Bi 4 O 5 I 2 composite has excellent light absorption capacity, abundant active centers, and excellent carrier separation efficiency. Finally, the degradation mechanism of FeOOH-1/La 10 -Bi 4 O 5 I 2 composites for 2,4-dinitrophenylhydrazine is rationally discussed based on experimental and theoretical calculations. This study presents a fresh design idea for developing bismuth oxyhalide-based composites with high activity.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Zi Jun Gao,Zhou Peng Li,Bin Hong Liu
In this work, we synthesized La-incorporated Ni-B amorphous composites and investigated their effects on enhancing dehydrogenation/hydrogenation properties of MgH 2 . MgH 2 with 5 wt% 2La-3Ni-B demonstrated significantly improved dehydriding kinetics. About 6.0 wt% hydrogen could be released within 5 min at 300 °C. Moreover, no decrease in deydrogenation rate was observed within ten cycles. XRD , XPS , SEM and HRTEM examinations revealed that the La incorporation into Ni-B resulted in an amorphous La-B-O structure that could keep its disorder state up to 600 °C. The crystallization and growth of Ni dispersed in the La-B-O structure was significantly retarded. Also the alloying of Mg with Ni or La was not observed. As a result, the added La-Ni-B composites showed higher structural and catalytic stability than Ni-B during hydriding/dehydriding cycling of MgH 2 at high temperatures.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2023
·
IF 8.9
Jie Liu,Kai Sun,Rui Zhu,Xun Wang,Michael Gatheru Waigi,Shunyao Li
Bisphenol A (BPA) is a ubiquitous endocrine disruptor that poses adverse human health risks. Herein, biotransformation kinetics, products, and mechanisms of BPA undergoing a laccase-producing Trametes hirsuta La-7 metabolism were for the first time reported. Strain La-7 could completely biotransform ≤0.5 mmol·L −1 BPA within 6 d in vivo . Notably, its extracellular crude laccase solution (ECLS) and intracellular homogenized mycelium (HM) only required 6 h to convert 85.71% and 84.24% of 0.5 mmol·L −1 BPA in vitro , respectively. The removal of BPA was noticeably hampered by adding a cytochrome P-450 inhibitor (piperonyl butoxide) in HM, disclosing that cytochrome P-450 monooxygenase participated in BPA oxidation and metabolism. BPA intermediates were elaborately identified by high-resolution mass spectrometry (HRMS) combined with 13 C stable isotope ratios (BPA: 13 C 12 -BPA = 0.25: 0.25, molar concentration). Based on the accurate molecular mass, isotope labeling difference, and relative intensity ratio of product peaks, 6 versatile metabolic mechanisms of BPA, including polymerization, hydroxylation, dehydration, bond cleavage, dehydrogenation , and carboxylation in vivo and in vitro , were confirmed. Germination index values revealed that inoculating strain La-7 in a BPA-contaminated medium presented no phytotoxicity to the germinated radish ( Raphanus sativus L.) seeds. In vivo , Mg 2+ , Fe 2+ , Fe 3+ , and Mn 2+ were conducive to BPA removal, but Cd 2+ and Hg 2+ significantly obstructed BPA elimination. Additionally, strain La-7 also exhibited high-efficiency metabolic ability toward estrone (E1), 17 β -estradiol (E2), and 17 α -ethinylestradiol (EE2), with more than 96.13%, 96.65%, and 100% of E1, E2, and EE2 having been converted, respectively. Our findings provide an environmentally powerful laccase-producing fungus to decontaminate endocrine disruptor-contaminated water matrices by radical polymerization and oxidative decomposition.
研究领域:
环境科学
·
微生物学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Qinqin He,Hongjun Zhao,Zedong Teng,Yin Wang,Weiling Sun,Yali Guo,Xiaonan Ji,Wei Hu,Su Shiung Lam,Min Li
Phosphorus (P) is known as a valuable resource, and recycling it from wastewater can avoid environmental pollution and resource waste. Herein, a regenerable magnetic Fe 3 O 4 and La-based metal–organic framework functional material (Fe 3 O 4 /La-MOF) was synthesized by solvent thermal method and its adsorption performances of phosphate were evaluated. The as-prepared magnetic Fe 3 O 4 /La-MOF exhibited magnetic separation efficiency of 97.9% and it could maintain the high adsorption capacity over a wide pH range from 3 to 10, as well as showed an excellent P adsorption selectivity in presence of Cl - , NO 3 – , HCO 3 – , CO 3 2– and SO 4 2- . The isotherm data were consistent with the Langmuir model, and the adsorption kinetic data conformed to the pseudo-second-order model, revealing that there was chemical adsorption between Fe 3 O 4 /La-MOF and phosphate. The electrochemical behavior of Fe 3 O 4 /La-MOF before and after phosphate adsorption showed that the band gap energy of LUMO (Lowest Unoccupied Molecular Orbital) and HOMO (Highest Occupied Molecular Orbital) of P adsorbed Fe 3 O 4 /La-MOF was lower than that of the material itself, which indicated the successful adsorption of phosphate on Fe 3 O 4 /La-MOF and the forming of a perfect hybrid structure. The characterization analysis of FT-IR and XPS illustrated that intra-sphere complex (La O P) formed between Fe 3 O 4 /La-MOF and phosphate by ligand exchange, which might be the dominant mechanism, followed by electrostatic attraction and precipitation. This study highlighted the great promise of magnetic reusable Fe 3 O 4 /La-MOF composite for application in phosphate removal and recovery.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Houde She,Suyue Cao,Jiufu Chen,Xiaoping Chen,Jingwei Huang,Lei Wang,Qizhao Wang
High indoor formaldehyde levels from residential decorations pose a pressing environmental concern, underscoring the urgency for effective catalytic degradation strategies. In this study, a La-doped ZnMn 2 O 4 catalyst with an oxygen-rich vacancy was successfully synthesized via a straightforward hydrothermal method. The experimental findings demonstrate that the L 0.5 ZMO catalyst, with a La doping amount of 0.5 mmol, exhibits a remarkable 100 % efficiency in degrading formaldehyde. Structural and spectroscopic analyses reveal that La doping in ZnMn 2 O 4 induces significant lattice expansion and an increased proportion of Mn 3 + species, both of which synergistically enhance the catalytic oxidation performance at room temperature. DFT results show that La doping concentrates the charge density near the Fermi energy level, significantly altering the charge distribution. This facilitates electron transfer, leading to enhanced photocatalytic performance. Furthermore, the introduction of oxygen vacancies generates abundant active sites, substantially improving the formaldehyde decomposition efficiency. This study highlights the critical role of La incorporation in modulating oxygen vacancies and surface properties of ZnMn 2 O 4 , yielding a cost-effective catalyst for efficient indoor formaldehyde abatement under ambient conditions.
研究领域:
环境科学
·
材料化学
·
催化
·
纳米技术
·
室内空气质量
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 12
·9595-9604
·
IF 2.22
Zhou Junyi,Zhang Huimin,Chang Aimin,Zhao Yifeng
La x Bi 1− x FeO 3 (LBFO) materials were synthesized by sol–gel method with x = 0.0, 0.1, 0.2, and 0.3. LBFO ceramics were obtained by rapid liquid phase sintering and conventional sintering, respectively. X-ray diffraction (XRD) and Raman spectroscopy indicated that the phase transition from twisted diamond R3C to orthogonal Pbnm occurs in the course of the increase of La element doping. Scanning electron microscopy demonstrated that the grain size of LBFO ceramics decreased from 10 to 1 μm, with the increase of La ion doping, and the volatilization of Bi decreases from 6.48 to 1.43%. It was found that LBFO ceramics have the characteristic of negative temperature coefficient (NTC), the resistivity (100 °C) is from 4.32 × 10 6 to 2.71 × 10 8 Ω cm, the material constant ( B 100/700 value) is about 6000–9000 K, the activation energy of LBFO is around 0.56 to 0.82 eV, and the temperature range of LBFO is from 100 to 700 °C. The resistivity change of LBFO is less than 1% after 500 h of ageing at 300 °C.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）