Materials
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2021
·Vol. 14
·期 9
·2224
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IF 3.623
Xinzhe Sun,Peng Guo,Yuanyuan Sun,Yuqian Cui
Lanthanun oxide (La2O3) is a lanthanum chemical compound incorporates a sensible anionic complexing ability; however, it lacks stability at a low pH scale. Biochar fibers will give the benefit of their massive space and plethoric uses on the surface to support a metal chemical compound. Herein, wet spinning technology was used to load La3+onto sodium alginate fiber, and to convert La3+into La2O3through carbonization. The La2O3-modified biochar (La-BC) fiber was characterized by SEM, XRD and XPS, etc. An adsorption experiment proved that La-BC showed an excellent adsorption capacity for chromates, and its saturation adsorption capacity was about 104.9 mg/g. The information suggested that the adsorption was in step with both the Langmuir and Freundlich models, following pseudo-second-order surface assimilation mechanics, which showed that the Cr (VI) adsorption was characterized by single-phase and polyphase adsorption, mainly chemical adsorption. The thermodynamic parameters proved that the adsorption process was spontaneous and endothermic. The mechanistic investigation revealed that the mechanism of the adsorption of Cr (VI) by La-BC may include electrostatic interaction, ligand exchange, or complexation. Moreover, the co-existing anions and regeneration experiments proved that the La-BC is recyclable and has good prospects in the field of chrome-containing wastewater removal.Keywords:wet spinning;lanthanum oxide;biochar;chromate;adsorption
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
PubMed
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2012
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IF 0.751
Guang ZHAN,Jun-xia YU,Zhi-gao XU,Fang ZHOU,Ru-an CHI
Lanthanum oxalate hydrate La 2 (C 2 O 4 ) 3 ·10H 2 O, the precursor of La 2 O 3 ultrafine powders, was prepared by impinging stream reactor method with PEG 20000 as surfactant. Thermal decomposition of La 2 (C 2 O 4 ) 3 ·10H 2 O from room temperature to 900 °C was investigated and intermediates and final solid products were characterized by FTIR and DSC-TG. Results show that the thermal decomposition process consists of five consecutive stage reactions. Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) methods were implemented for the calculation of energy of activation ( E ), and the results show that E depends on α, demonstrating that the decomposition reaction process of the lanthanum oxalate is of a complex kinetic mechanism. The most probable mechanistic function, G (α)=[1−(1+α) 1/3 ] 2 , and the kinetic parameters were obtained by multivariate non-linear regression analysis method. The average E -value that is compatible with the kinetic model is close to value which was obtained by FWO and KAS methods. The fitting curve matches the original TG curve very well.
研究领域:
材料科学
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化学动力学
✓ 已验证
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DOI
高影响因子
Scientific Reports
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2016
·Vol. 6
·期 1
·1-8
·
IF 5.228
Cai Kedi,Yang Rui,Lang Xiaoshi,Zhang Qingguo,Wang Zhenhua,He Tieshi
Gradient Mn-La-Pt catalysts with three-layered structure of manganese dioxide (MnO 2 ), lanthanum oxide (La 2 O 3 ), and Platinum (Pt) for Li-O 2 battery are prepared in this study. The mass ratio of the catalysts is respectively 5:2:3, 4:2:4, and 3:2:5 (MnO 2 : La 2 O 3 : Pt) which is start from the side of the electrolyte. The relationship between morphology structure and electrochemical performance of gradient catalyst is investigated by energy dispersive spectrometry and constant current charge/discharge test. The Li-O 2 battery based on gradient Mn-La-Pt catalysts shows high discharge specific capacity (2707 mAh g −1 ), specific energy density (8400 Wh kg −1 ) and long cycle life (56 cycles). The improvement of the Li-O 2 battery discharge capacity is attributed to the gradient distribution of MnO 2 and Pt and the involvement of La 2 O 3 that can improve the energy density of the battery. More important, this work will also provide new ideas and methods for the research of other metal-air battery.
研究领域:
材料科学
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电化学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yinghao Xue,Wei Teng,Yanyan Chen,Qian Ma,Xiaoqian Chen,Yu Sun,Jianwei Fan,Yuping Qiu,Rongbing Fu
Simultaneous removal of cation (e.g., Pb(Ⅱ), Cd(Ⅱ)) and oxyanion (e.g., As(Ⅴ)) heavy metals have attracted increasing interest for adsorption applications due to the complexity of heavy metal polluted groundwater. Manganese-lanthanum binary oxides immobilized on hydrothermal carbonization carbon (Mn x La 1-x @HTCC) were therefore rationally designed in this work, and the Mn-La oxides immobilized on HTCC exhibited more uniform dispersion compared to bulk phase. In single adsorption systems, superior adsorption of different heavy metals could be achieved by tuning the molar ratio of Mn to La, and Mn leaching was reduced by ∼ 75% compared with Mn@HTCC (without La doping). In the coexisting systems, the simultaneous presence of As(Ⅴ) and Pb(Ⅱ) greatly enhanced adsorption of both two heavy metals, while competition was observed in the coexistence of As(Ⅴ) and Cd(Ⅱ). By analyzing the “release-readsorption” phenomenon of Mn and the variation of Mn valence during adsorption, the different roles of Mn species in the removal of three heavy metals were proposed. Finally, high-speed flow adsorption column experiments confirmed that the Mn x La 1-x @HTCC composite can effectively and continuously adsorb heavy metals accompanied by trace Mn leaching content. Overall, this study indicates the potential of Mn-La carbon composites as a novel adsorbent in groundwater remediation.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2021
·
IF 5.876
Yue Teng,Guangqing Song,Rong Chen,Xiao Zhang,Yongjun Sun,Haixia Wu,Biming Liu,Yanhua Xu
Background Excessive nitrate and phosphate in water is a major cause for eutrophication. Methods Carboxymethyl β-cyclodextrin immobilized on hydrated lanthanum oxide (LaCD) composite was fabricated, using carboxymethyl β-cyclodextrin (CM-β-CD) to immobilize hydrated lanthanum oxide (HLO). LaCD can efficiently and simultaneously adsorb nitrate and phosphate. Significant findings Results disclosed that the adsorption capacity in sole system reached 37.50 mg N/g and 66.98 mg P/g, whereas the adsorption capacity in binary system reached 31.62 mg N/g and 64.05 mg P/g. LaCD can also maintain high and stable adsorption efficiency within a wide pH range (4–11). Characterizations indicated excellent adsorption efficiency of LaCD for nitrate and phosphate. This finding may be due to electrostatic interaction, hydrogen bonding of abundant oxygen-containing groups on CM-β-CD surface and host-guest interaction in β-cyclodextrin (β-CD) cavity. HLO on LaCD had specific adsorption to phosphate through Lewis acid-base interaction and ligand exchange. Ten cycles verified LaCD had excellent reusability in adsorption-desorption experiments. This study may provide a supplementary method for synchronous and efficient removal for nitrate and phosphate to solve water eutrophication problem.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 21
·2200658
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IF 6.389
Chunye Yang,Siyuan Lin,Wenqing Zhao,Yu Dong,Yueheng Qi,Shaohui Yuan,Zihao Zeng,Li Wang,Yue Yang,Peng Ge
Natural molybdenite (MoS 2 ) displays large interlayer distance and rich electrochemical activities, but suffers from the complex preparation process with serious pollution. MoS 2 , as the low-cost resources, have captured numerous attentions as first-hand energy-storage materials. However, they are still limited by the shuttling of polysulfide and side reactions. Through the in situ solution deposition and thermochemical methods, molybdenite@La 2 O 3 is successfully prepared with the formation of Mo S La bonds in the interfaces. La 2 O 3 , as the important catalyst, is uniformly distributed on the surface of molybdenite, which serves vital roles in the redox reversibility. Owing to the fascinating architecture, the as-obtained samples deliver a considerable capacity of 803.1 mA h g −1 , with high coulombic efficiency of 86.32%. After 500 cycles, the capacity increases up to ≈ 1200 mA h g −1 . Even at 5.0 A g −1 , its capacity can be remained ≈ 550 mA h g −1 after 100 cycles. Assisted by the detailed kinetic behaviors, the improved energy-storage capability mainly comes from the enhancements of pseudocapacitive behaviors. Moreover, benefiting from the detailed resistance analysis, the existing of La 2 O 3 can induce the evolution of redox reactions stability. Thus, the work is expected to provide effective modified strategy for natural molybdenite in energy-storage systems.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
JOURNAL OF CATALYSIS
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2022
·
IF 8.047
Xilun Zhang,Lin Liu,Jiemin Wang,Xiaohua Ju,Rui Si,Ji Feng,Jianping Guo,Ping Chen
To exploit the ammonia as a carrier for sustainable energy, development of efficient catalysts is highly desired. Oxide supported Ru catalysts have been widely studied in ammonia synthesis for their superior catalytic performances under mild conditions. Here, sub-nanometer Ru clusters on La 2 O 3 (Ru clusters/La 2 O 3 ) catalyst has been synthesized and exhibits superior catalytic performance in ammonia synthesis under mild conditions. Multiple characterizations results reveal that surface La-H species, in situ generated on the surface of catalyst, can significantly boost the activity of Ru clusters/La 2 O 3 catalyst in ammonia synthesis. Detailed mechanistic studies demonstrate that the active La-H species on the La 2 O 3 can not only promote activation and dissociation of nitrogen molecules but also directly involve in ammonia synthesis reaction process via a La-H species-mediated reaction pathway. This work promotes molecular level understanding the active sites and reaction mechanism under real reaction conditions, and will also offer opportunity for guiding the design of efficient Ru-based catalysts for ammonia synthesis.
研究领域:
催化化学
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材料科学
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能源化学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Zhilan Pan,Hao Guo,Lei Sun,Bingqing Liu,Yuan Chen,Tingting Zhang,Mingyue Wang,Liping Peng,Wu Yang
In this present paper, a novel electrochemical sensor based on a covalent organic framework (COF) and lanthanum oxide (La 2 O 3 ) and multi-wall carbon nanotubes (MWCNT S ) was prepared for sensitive and selective detection of dopamine (DA) and uric acid (UA). The sensor demonstrated excellent analytical performance for DA and UA owing to the synergistic effect among large surface area of COF, highly conducting MWCNTs and highly catalytic La 2 O 3 . Particularly, the COF with a BET surface area of 1396.04 m 2 /g prepared by the Schiff base reaction between 2, 5-dibromobenzene-1, 4-dicarbaldehyde (DBTA) and 2, 4, 6-tris(4-aminophenyl)− 1, 3, 5-triazine (TAPT), significantly enhanced the adsorption and enrichment ability of the resulted modified electrode toward the target molecules. The constructed electrochemical sensor possessed low detection limits (0.039 μM for DA and 0.024 μM for UA) and wide linear ranges (2 ~ 450 μM for DA and 0.4 ~ 450 μM for UA) and could be employed to detect simultaneously the contents of DA and UA in biological and medicine samples with outstanding reproducibility, high stability as well as strong anti-interference property.
研究领域:
分析化学
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生物医学工程
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yuxiao Fang,Chun Zhao,Ivona Z. Mitrovic,Cezhou Zhao
Radiation hardness is important for electronics operating in harsh radiation environments such as outer space and nuclear energy industries. In this work, radiation-hardened solution-processed ZrLaO thin films are demonstrated. The radiation effects on solution-processed ZrLaO thin films and InOx/ZrLaO thin-film transistors (TFTs) were systemically investigated. The Zr0.9La0.1Oy thin films demonstrated excellent radiation hardness with negligible roughness, composition, electrical property, and bias-stress stability degradation after radiation exposure. The metal-oxide-semiconductor capacitors (MOSCAPs) based on Zr0.9La0.1Oy gate dielectrics exhibited an ultralow flat band-voltage (VFB) sensitivity of 0.11 mV/krad and 0.19 mV/krad under low dose and high dose gamma irradiation conditions, respectively. The low dose condition had a 103 krad (SiO2) total dose and a 0.12 rad/s low dose rate, whereas the high dose condition had a 580 krad total dose and a 278 rad/s high dose rate. Furthermore, InOx/Zr0.9La0.1Oy thin-film transistors (TFTs) exhibited a large Ion/Ioff of 2 × 106, a small subthreshold swing (SS) of 0.11 V/dec, a small interface trap density (Dit) of 1 × 1012 cm–2, and a 0.16 V threshold shift (ΔVTH) under 3600 s positive bias-stress (PBS). InOx/Zr0.9La0.1Oy TFT-based resistor-loaded inverters demonstrated complete swing behavior, a static output gain of 13.3 under 4 V VDD, and an ∼9% radiation-induced degradation. Through separate investigation of the radiation-induced degradation on the semiconductor layer and dielectric layer of TFTs, it was found that radiation exposure mainly generated oxygen vacancies (Vo) and increased electron concentration among gate oxide. Nevertheless, the radiation-induced TFT instability was mainly related to the semiconductor layer degradation, which could be possibly suppressed by back-channel passivation. The demonstrated results indicate that solution-processed ZrLaO is a high-potential candidate for large-area electronics and circuits applied in harsh radiation environments. In addition, the detailed investigation of radiation-induced degradation on solution-processed high-k dielectrics in this work provided clear inspiration for developing novel flexible rad-hard dielectrics.
研究领域:
材料科学
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电子工程
·
辐射物理
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
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2025
·
IF 7.2
Yuanxuan Yu,Meng Wang,Qingping Zhang,Zongyu Feng,Yang Xu,Guang Yang,Zhiqing Yang
In the ion-exchange process for separating and purifying rare earth elements, the separation is primarily achieved through the differences in the complexation reactions between the rare earth elements and the eluent. Therefore, enhancing these reaction differences is crucial to improving separation efficiency. In this study, the dissociation constants of ethylene diamine tetraacetic acid (EDTA) at different temperatures were determined by pH potentiometric titration. The speciation evolution of metal-EDTA complexes was elucidated through simulations conducted with Visual MINTEQ, enabling a systematic investigation into the temperature dependence of stability constants for EDTA complexes with La 3+ and representative impurity metal ions (Ce 3+ , Mg 2+ , Al 3+ , Ca 2+ , Cu 2+ , Zn 2+ ). Building upon this, static desorption studies and ion-exchange experiments were conducted to validate the removal of key impurities in lanthanum oxide. Experimental results show that, Mg 2+ and Ca 2+ exhibit better selective separation from La 3+ due to the significant differences in complexation constants. The difference in complexation stabilization constants between La 3+ and impurity ions reaches the maximum at 30 °C. The temperature primarily enhances the reaction difference in the separation system by modulating the distribution of complex species. Desorption studies indicate that increasing the temperature improves the separation coefficient between La and impurity elements. After optimization, the ion-exchange method achieves a La recovery rate of 84.91 wt% and a total impurity removal rate exceeding 92.50 wt%. Under the optimized elution conditions, an elution process was applied to the real feed solution, yielding a lanthanum oxide product with a relative purity of 99.99991 wt%. This work deepens the understanding of temperature-induced regulation of complexation stability constants and provides a novel approach for ion-exchange purification of rare earth elements.
研究领域:
化学工程
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稀土分离
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DOI
高影响因子
Advanced Science
·
2025
·
IF 14.1
Guilin Wei,Jiangfeng Song,Yan Shi,Linsen Zhou,Xianglin Wang,Junhong Luo,Ning Liu,Feize Li,Xingwen Feng
Catalytic oxidation plays a crucial role in the efficient treatment of hydrogen isotopes, with the key technical challenge being the development of high-performance catalysts to enhance isotope removal efficiency, thereby reducing environmental pollution and ensuring public radiation safety. Herein, the strategic control of platinum nanoclusters confined within silicalite-1 zeolites is reported to enhance the high removal efficiency for hydrogen isotopes under low-temperature conditions for the first time. Incorporating a single lanthanum oxide (LaO x ) into Pt nanoclusters adapts the local charge of adjacent Pt atoms, significantly altering their electronic structure. The existence of individual LaO x species is confirmed by X-ray absorption spectroscopy and aberration-corrected electron microscopy, and the performance enhancement mechanism is further probed by theoretical calculations. This embedded single LaO x both facilitates local charge adjustment and supplies abundant active oxygen species, leading to performance enhancement by reducing the energy barrier of rate-determining step (O * + H → OH * ), in accordance with the Mars-van Krevelen mechanism. Consequently, during a surprisingly long-term restart performance test (≈267 d), the PtLaOx@S-1 maintained a high conversion rate over 99% at 50 °C and a space velocity of 48,000 mL·g −1 ·h −1 . This study highlights the potential of individual LaO x sites for enhancing hydrogen isotope oxidation.
研究领域:
催化化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
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IF 8.355
Chen Chen,Lei Xu,Jiang-Bo Huo,Kiran Gupta,Ming-Lai Fu
A novel multifunctional material of MOF-derived porous carbon coated lanthanum oxide (donated as La-MOF-900) had been successfully synthesized by hydrothermal-calcination method, which used in the simultaneous removal of butylparaben (BPB) and As(III). For the single contaminant system, the degradation rate of BPB could reach 98% and retain a high removal efficiency in a wide pH range of 3–9, which covered the most wastewater. In contrast, the removal rate of As(III) reached 90% in the pH of 3, and still 70% of the As(III) can be removed in the pH of 9. For the BPB-As(III) binary system, the presence of As(III) had no obvious impact on the degradation rate of BPB. However, the removal rate of As(III) was suppressed at the presence of BPB because of the competitive reaction of radicals between BPB and As(III). O 2 − , 1 O 2 , HO and SO 4 − were all involved in La-MOF-900/PS system. The composition of porous carbon in the La-MOF-900 was responsible for activating persulfate to degrease BPB and oxidize As(III) to As(V) while La 2 O 3 component of La-MOF-900 acted as adsorbent for the removal of evolved As(V). The proposed strategy would be very indicative for the efficient co-removal of combined pollutants in the aqueous solution.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）