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Showing papers on "Lanthanum published in 2020"


Journal ArticleDOI
TL;DR: The measurement of superconductivity at above 200 K in compressed samples of hydrogen sulfide and in lanthanum hydride at 250 K is reinvigorating the search for conventional high temperature superc...
Abstract: The measurement of superconductivity at above 200 K in compressed samples of hydrogen sulfide and in lanthanum hydride at 250 K is reinvigorating the search for conventional high temperature superc...

148 citations


Journal ArticleDOI
TL;DR: In this article, the high efficiency of NaLa(CO3)2 decorated magnetic biochar described as La-Fe-BC for the elimination of phosphate in water was reported.

147 citations


Journal ArticleDOI
TL;DR: La-coated biochar at a pyrolysis temperature of 600 °C had the highest phosphate adsorption and the lowest heavy metal leaching potential, suggesting that the sludge-based biochar could serve as a promising adsorbent for phosphate in real applications.

113 citations


Journal ArticleDOI
TL;DR: PC@La-1.0 as mentioned in this paper was constructed by Mg-La bimetal carbonated hydroxides with the three-dimensional needle-like nanostructure, and it achieved highly effective adsorption for both phosphate and fluoride.

81 citations


Journal ArticleDOI
TL;DR: MgFe2O4-biochar based lanthanum alginate beads (mgFe4-BM-La(b)) were prepared and used for phosphate removal from aqueous solution.

78 citations


Journal ArticleDOI
TL;DR: In this article, a Pr-doping strategy was used to improve traditional strontium-doped lanthanum ferrite oxides for proton-conducting solid oxide fuel cells (SOFCs).

71 citations


Journal ArticleDOI
TL;DR: In this article, a lanthanum-doped cobalt ferrites (CoLaxFe2-xO4) were successfully synthesized via sol-gel method at 300 °C.

70 citations


Journal ArticleDOI
TL;DR: Fang Hong et al. as discussed by the authors, Liuxiang Yang, Pengfei Shan, Ziyi Liu, Jianping Sun, Yunyu Yin, Xiaohui Yu and Jinguang Cheng.
Abstract: Fang Hong(ö)1†, Liuxiang Yang( 3)2†, Pengfei Shan(ü+œ), Pengtao Yang( C ), Ziyi Liu(4f ́), Jianping Sun(šï2), Yunyu Yin(Ð ‰), Xiaohui Yu(u¡Ÿ)1,3∗, Jinguang Cheng(§71)1,3∗, and Zhongxian Zhao(ë§p) Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China Center for High Pressure Science & Technology Advanced Research, Beijing 100094, China School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China

67 citations


Journal ArticleDOI
TL;DR: In this paper, a simple and large-scale solid-state approach is developed to prepare lanthanum-based oxides co-coated LiNi0.5Co0.2Mn0.3O2 cathode materials.

61 citations


Journal ArticleDOI
TL;DR: In this article, a carbonate-rich lanthanum-substituted zinc spinel ferrite assembled reduced graphene oxide nanohybrids (LaZF@rGO) were simply synthesized using a simple hydrothermal-induced precipitation process.

57 citations


Journal ArticleDOI
TL;DR: It is proposed that phosphate was competitive than DOC for the ligand exchange sites of singly-coordinated hydroxyls, but DOC can be solely adsorbed onto the uncharged hydroxYLs via hydrogen bonding.

Journal ArticleDOI
TL;DR: The thermodynamic studies elucidated that Pb(II) and La(III) adsorption onto GQDOs-Ba followed a spontaneous model and accomplished excellent removal percentages from different water samples containing lead and lanthanum.

Journal ArticleDOI
TL;DR: Talc (a low-cost clay) encapsulated salts alginate (TAL) beads were synthesized by cross-linking with lanthanum ion and tested for phosphate adsorption and exhibited superior phosphate fixation performance in the long-term experiment, demonstrating that TAL-7 beads could be a cost-effective and promising biosorbent in the aqueous environment.

Journal ArticleDOI
TL;DR: In this paper, the authors focused on the hydrothermal fabrication of lanthanum-based metal-organic frameworks (MOFs) with the linkers of benzene-1,4-dicarboxylic acid (BDC) and amine-functionalized amine functionalization (AFL).
Abstract: The present work is focused on the hydrothermal fabrication of lanthanum (La)-based metal–organic frameworks (MOFs) with the linkers of benzene-1,4-dicarboxylic acid (BDC) and amine-functionalized ...

Journal ArticleDOI
01 Jul 2020-Vacuum
TL;DR: In this article, the authors investigated oxygen-deficient lanthanum (La) doped cerium oxide (CeO2) nanoparticles for their potential applications in spintronics and photocatalysis.

Journal ArticleDOI
TL;DR: In this article, the authors reported the data found by FT-IR spectroscopy, and ultrasonic velocities investigations of 65TeO2 − 25TiO2 - (10-x) CdO x La2O3, (0,≤ x ≤ 10 mol%) of the prepared glass samples.
Abstract: The authors reported the data found by FT-IR spectroscopy, and ultrasonic velocities investigations of 65TeO2 – 25TiO2 – (10-x) CdO – x La2O3, (0 ≤ x ≤ 10 mol%) of the prepared glass samples FT-IR spectra of these glass samples have been indicated the cadmium lanthanum tellurite titanate glasses increase the transformation of (TeO4) structural units into (TeO3) structural units with creation of non-bridging oxygen The mechanical properties have been associated with the results of FT-IR spectra It was noted that the elastic-moduli, and density of these samples slightly decrease with the increase of lanthanum due to the creation of non-bridging oxygen UV–visible spectroscopy was recorded at room temperature for these glasses The increase of Lanthanum shifts the optical spectra to the redshift of the optical bandgap So, lanthanum is accountable for the increase of non-bridging oxygen due to this shift is obtained So, the optical bandgap of these glasses has been decreased as well as the refractive index Polarizability and basicity of the prepared glasses according to the refractive index and optical bandgap have been investigated

Journal ArticleDOI
01 Apr 2020
TL;DR: Experimental results showed that the total phosphorus in the water can get to the maximum adsorption capacity when pH = 4.0, which highlights the advantages of intercalating lanthanum into MOFs and the addition of GO not only facilitates the separation of materials, but also has excellent removal ability for water purification.
Abstract: Metal organic framework materials (MOFs) are kinds of hybrid materials with intra-molecular pores formed by self-assembly of organic ligands and metal ions through coordination bonds. In the paper, a type of MOFs named as [Zn(μ-L)(μ-1,3-dpp)](mof-1), using Zn2+ as metal ions, 4,4′-oxybis(benzoic acid) and 1,3-di(4-pyridyl)propane as organic ligands was synthesized. The rare earth element lanthanum, which has specific adsorption for phosphorus, is intercalated into mof-1 by the impregnation method in order to remove phosphorus-containing wastewater. In order to optimize the nano-sized La-mof-1 materials to facilitate separation, we prepared a membrane by blending MOFs materials with graphene oxide (GO) by pressure application. The addition of GO not only facilitates the separation of materials, but also has excellent removal ability for water purification. After a series of structural characterization, the adsorption properties of materials were tested. The experimental results showed that the total phosphorus in the water can get to the maximum adsorption capacity when pH = 4.0. It can be viewed in thermodynamic studies that increasing the temperature favors the adsorption reaction. Increasing the temperature to the 318 K, the equilibrium adsorption capacity of the membrane to total phosphorus in the water reached 139.51 mg/g. The adsorption removal rate of total phosphorus can reach 100% when its concentration is lower than 100 mg/L. This highlights the advantages of intercalating lanthanum into MOFs. The penetration curve was drawn by dynamic adsorption experiments to understand the mass transfer mechanism of La-mof-1GO membrane. Since GO also has a large specific surface area, it is another excellent adsorption material. Experimental data showed that compared with the original water sample, the removal rate of COD in the water reached 73.9%.

Journal ArticleDOI
TL;DR: Results of the XPS and 31P NMR spectra indicate that the La/Al co-existing novel P inactivation agents are a promising sorbent for lake sediment P control.
Abstract: In this study, a green solvent-free drying production method was used to prepare an attapulgite clay/lanthanum and aluminum (ACLA) composite as a novel phosphorus (P) sorbent to immobilize P in lak...

Journal ArticleDOI
TL;DR: In this article, a facile and binder free successive ionic layer adsorption and reaction (SILAR) method was used to synthesize 3%La-MnO2@GO composite thin film.

Journal ArticleDOI
TL;DR: A series of rare earth (RE) metal complexes stabilized by polydentate N-methylethylenediamine-bridged tris(phenolato) ligands was synthesized and characterized in this paper.
Abstract: A series of rare-earth (RE) metal complexes (Y, Sm, Nd, and La) stabilized by polydentate N-methylethylenediamine-bridged tris(phenolato) ligands was synthesized and characterized. Lanthanum comple...

Journal ArticleDOI
TL;DR: Studying of the removal mechanism of the Fe3O4/La(OH)3 nanocomposite revealed that surface complexation and the electrostatic interaction between phosphate species and lanthanum hydroxide played a prominent role in the sorption of phosphate.


Journal ArticleDOI
TL;DR: In this article, the influence of different parameters on the catalytic activity on methane dry reforming of methane (DRM) was investigated on different Nickel based catalysts deposited on MgAl2O4.

Journal ArticleDOI
TL;DR: In this article, basic magnesium-lanthanum (Mg-La) mixed oxide materials with tunable interaction between Mg and La oxides were prepared for the low temperature production of green diesel and jet fuel intermediates via aldol condensation reaction.
Abstract: Basic magnesium–lanthanum (Mg–La) mixed oxide materials with tunable interaction between Mg and La oxides were prepared for the low temperature production of green diesel and jet fuel intermediates via aldol condensation reaction. The prepared materials were thoroughly analysedby microscopic and spectroscopic techniques to elucidate its structural properties, including the determination of surface area and basic strengths. Among the tested materials, ML-3 catalyst reflects superior activity for C C bond formation between 5-hydroxymethylfurfural (HMF) and acetone, exhibiting >99% HMF conversion and 89% yield of the precursory C9 4-[5-(Hydroxymethyl)-2-furanyl]-3-butene-2-one product (HAc). Higher conversion and better product selectivity of ML-3 catalyst ascribe to the higher basic strength, moderate surface area and strong interaction between both the metals (Mg and La) in their mixed oxide forms. To understand the role of active sites, zeroth, first and second order kinetics were plotted, and a possible mechanism of C C bond formation was hypothesized. In order to rationalize the role of active ML-3 catalyst, HMF (and furfural) chain lengths were extended with different carbonyl compounds leading the formation of branched and cyclic chain (C9–C15) hydrocarbon precursors.

Journal ArticleDOI
TL;DR: In this article, the synthesis of non-noble metal-based lanthanum doped copper oxide nanoparticles as a potential bi-functional electrocatalyst for overall water splitting in alkaline electrolyte was presented.

Journal ArticleDOI
TL;DR: Huang et al. as discussed by the authors presented the first synthesis of lanthanum titanate (La2Ti2O7, LTO) with dandelion-like nanostructures via the molten salt method.
Abstract: The rational design of nanomaterials with distinct exposed facets is of great importance for improving the physicochemical properties of these materials and for the study of structure–activity relationships. This work describes the first synthesis of lanthanum titanate (La2Ti2O7, LTO) with dandelion-like nanostructures via the molten salt method. The lowest synthesis temperature of 700 °C is at least 200 °C lower than that required by other methods. The dandelion structure consists of well-crystallized LTO nanorods (NRs) with sizes of less than 100 nm in the radial direction and 300–500 nm in the axial direction, which is different from the widely accepted two-dimensional form. LaOCl microplates were formed as an intermediate substrate for LTO NR growth outwards to the basal surfaces of the LaOCl crystallites. DFT calculation results showed that the strong LiCl adsorption on the (100) surface led to distinct growth of the (100) and (020) planes, thus promoting the rod-like growth of LTO along the [010] axis. In addition, the photocatalytic performance of as-prepared LTO was evaluated by determining the degradation of rhodamine B. The results suggested that the as-prepared LTO could markedly enhance the photocatalytic activity as a result of the surface heterojunction of coexposed {100} and {002} facets in LTO NRs. A catalyst that uses light irradiation to decompose organic pollutants can become more active by being fabricated into rod-like nanostructures resembling dandelion seeds. Zhong Huang from the Wuhan University of Science and Technology in China and co-workers have developed a method for synthesizing lanthanum titanate, a ceramic that excels at separating positive and negative photogenerated charges so they can be employed for catalytic reactions. The team’s approach quickly prepares lanthanum titanate nanocrystals using a bath of molten lithium and potassium salts. By optimizing the molten salt concentrations, the researchers isolated tiny aggregates of nanorods that have a high number of exposed crystal facets for charge separation. Experiments showed the nanorods could degrade model pollutants such as rhodamine dyes several times faster than conventional plate-shaped lanthanum titanates. A surface heterojunction is formed in the dandelion-like LTO, resulting in significant enhancement of the photocatalytic performance.

Journal ArticleDOI
TL;DR: The use of LMB does not pose a toxicity risk, gastrointestinal absorption of Lanthanum is minimal and independent on the type of the compound, and with exception of the liver, no significant increase in lanthanum levels is observed in the various organs under study.

Journal ArticleDOI
TL;DR: In this paper, the chemical and electrochemical stability of lanthanide nickelates La2NiO4+δ (LNO), PNO, and their mixed compounds La1.5Pr0.5, 1 or 1.5 is reported.

Journal ArticleDOI
TL;DR: In this paper, the influence of lanthanum promotion on the physico-chemical properties and catalytic activity of Ni/Mg-Al catalysts in the glycerol steam reforming (GSR) reaction was studied.
Abstract: The influence of lanthanum promotion on the physico-chemical properties and catalytic activity of Ni/Mg-Al catalysts in the glycerol steam reforming (GSR) reaction was studied. An Mg-Al and different Mg-Al-La supports with various molar ratios were synthesized using a co-precipitation technique. The calcined supports were then impregnated with 5 wt% Ni. After calcination at 600 °C, physico-chemical properties of the Ni-based catalysts were investigated by XRD, BET, H2-TPR, and CO2-TPD techniques. H2-TPR analyses showed that the quantity of lanthanum in the support composition influenced the reducibility of Ni species as well as their dispersion. CO2-TPD analyses showed that lanthanum addition improved catalyst basicity. The activity of all catalysts in the GSR reaction was tested (T = 400−700 °C, water/glycerol feed ratio 9:1, flow rate of 0.025 mL/min). The composition of the Ni/MAL0.4 (Ni/Mg6Al1.6La0.4; subscripted numbers indicate the molar ratio of each metal) catalyst provided a good metal-support interaction and Ni dispersion which translated to an overall superior performance in terms of hydrogen yields, glycerol conversion to gaseous products, and total glycerol conversions. TG-DSC analyses of the spent catalysts showed that the lanthanum quantity also influenced the quantity of coke deposition. The formation of encapsulating coke over all catalysts was linked to high concentrations of dehydration products observed in liquid product analysis. A stability test conducted at 600 °C for Ni/MAL0.4 revealed its deactivation due to encapsulating coke formation which resulted in active metal site blockage. With a reduced flow rate (0.008 mL/min), a different coke formation mechanism allowed the catalyst to last for 24 h.

Journal ArticleDOI
29 Oct 2020
TL;DR: In this article, the authors used carboxyl cellulose nanofibers (CNFs) extracted from rice husks using the TEMPO-oxidation method and evaluated the extracted CNFs as an adsorbent for the removal of lead(II) and lanthanum(III) (Pb(II), and La(III)) ions from contaminated water.
Abstract: Rice husks are an agricultural residue of great annual production and have a high cellulose content. In this study, we have prepared highly charged carboxyl cellulose nanofibers (CNFs) from rice husks using the TEMPO-oxidation method and the extracted CNFs were evaluated as an adsorbent for the removal of lead(II) and lanthanum(III) (Pb(II) and La(III)) ions from contaminated water. Three different forms of nanocellulose adsorbents were prepared: suspension, freeze-dried, and nanocomposite containing magnetic nanoparticles, where their adsorption performance was tested against the removal of the two chosen heavy metal ions. The maximum adsorption capacity of rice husk based CNFs was found to be the highest in the nanocellulose suspension, i.e., 193.2 mg g−1 for Pb(II) and 100.7 mg g−1 for La(III). The separation of the used adsorbent in the suspension was further facilitated by the gelation of the CNFs and metal cations, where the resulting floc could be removed by gravity-driven filtration. The absorption mechanism of the investigated CNF system is mainly due to electrostatic interactions between negatively charged carboxylate groups and multivalent metal ions. It was found that 90% lanthanum content in the form of lanthanum oxychloride (determined by X-ray powder diffraction) could be obtained by incinerating the CNF/LaCl3 gel. This study demonstrates a viable and sustainable solution to upcycle agricultural residues into remediation nanomaterials for the removal and recovery of toxic heavy metal ions from contaminated water.