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Showing papers on "Lanthanum published in 2019"


Journal ArticleDOI
TL;DR: In this article, a simple solvothermal reaction was developed to synthesize the novel lanthanum-doped UiO-66, which can be generated in the process of doping.

222 citations


Journal ArticleDOI
TL;DR: Hydrated lanthanum (La) oxide-modified diatomite composites (La-diatomite) were fabricated by a facile method and employed as the highly efficient adsorbent for the low-concentration phosphate removal from simulating secondary effluents to alleviate the eutrophication.

130 citations


Journal ArticleDOI
TL;DR: In this article, a rice-like La@MgAl nanocomposites by anchoring La species into Mg-Al LDH matrix to achieve effective and synchronous phosphate and fluoride capture was reported.

116 citations


Journal ArticleDOI
TL;DR: Overall, the La-biochar material could be applied as a potential sustainable building block for the preconcentration of phosphorus for practical pollutant purification.

113 citations


Journal ArticleDOI
TL;DR: In this article, a low-cost, eco-friendly absorbent, LPC@La(OH)3, by loading lanthanum hydroxide nanorods within lignin-derived porous carbon for superfast and highly efficient phosphorus removal.
Abstract: Removing phosphate ions from eutrophic waters is of paramount importance; however, the design of low-cost, high-performance adsorbents for phosphorus removal has remained a huge challenge. Herein, we have demonstrated the fabrication of a low-cost, eco-friendly absorbent, LPC@La(OH)3, by loading lanthanum hydroxide nanorods within lignin-derived porous carbon for superfast and highly efficient phosphorus removal. As-prepared LPC@La(OH)3 exhibits a high adsorption capacity of 60.24 mg P L–1 and a high lanthanum usage efficiency. Our results show an ultrafast removal of up to 99.5% phosphate in 10 min when the initial concentration is 2 mg P L–1. Moreover, LPC@La(OH)3 can efficiently reduce the phosphate concentration to meet the below U.S. Environmental Protection Agency limits (50 μg P L–1) for eutrophication prevention. More importantly, it shows a high phosphate absorption ability over the wide range of pH 3–7, in addition to a high adsorption selectivity toward phosphate and high stability during adsor...

102 citations


Journal ArticleDOI
TL;DR: In this paper, the first example of loading Lanthanum in magnetic ordered mesoporous silica nanoparticles for the removal of phosphate in water was reported, and the optimum sample MagMSNs-42%La exhibited a fast adsorption kinetics and a high Langmuir maximum adaption capacity of 54.2 mg P/g.

100 citations


Journal ArticleDOI
TL;DR: In this paper, the linkers of benzoic acid (BA), 1,4-benzene dicarboxylic acid (DDA), and 1,3,5-benzenetricarboxyl acid (BTC) were used to synthesize lanthanum organic frameworks.
Abstract: In this study, we tried to synthesize lanthanum organic frameworks (MOFs) with the linkers of benzoic acid (BA), 1,4-benzene dicarboxylic acid, and 1,3,5-benzenetricarboxylic acid (BTC), abbreviate...

96 citations


Journal ArticleDOI
Li Wang1, Jingyi Wang1, Chi He1, Wei Lyu1, Wenlong Zhang1, Wei Yan1, Liu Yang1 
TL;DR: In this paper, rare earth element doped magnetic biochars, Ce/Fe3O4-BC and Lanthanum (La) were prepared by separately co-precipitating cerium and lanthanum with FeCl3, FeCl2 and biochar.

86 citations


Journal ArticleDOI
TL;DR: The resulting LO-alumina combination exhibits record-high phosphate adsorption capacity as well as excellence in adsorptive selectivity and sewage phosphate removal.

84 citations


Journal ArticleDOI
TL;DR: The experimental results clearly indicated that the prepared La@CS membrane could be utilized for the removal of phosphate and nitrate ions from aqueous solution.

82 citations


Journal ArticleDOI
TL;DR: In this article, a review of rare earth elements-based conversion coatings is presented as an environmentally benign alternative to conventionally used chromate-based conversions for magnesium and its alloys.
Abstract: Rare-earth elements-based conversion coatings are actively researched as an environmentally benign alternative to conventionally used chromate-based conversion coatings for magnesium and its alloys. Here, we reviewed the topic comprehensively. The review starts with a short introduction on corrosion of magnesium alloys and chemical conversion treatments, and that is followed by a detailed description of cerium-based conversion coatings. Morphology, structure and composition of the cerium conversion coatings, their mechanism of formation and competence for corrosion control explained. Influence of various inorganic (hydrogen peroxide, phosphates, permanganates, vanadates, molybdates, etc.) and organic (silane, gelatin, phytic acid, etc.) co-additives discussed. Effect of various pre- and post-treatments described. Reported works on rare-earths other than cerium, viz. lanthanum, yttrium, samarium, neodymium, gadolinium and praseodymium are also reviewed. Future potentials of R & D presented.

Journal ArticleDOI
TL;DR: In this paper, a high-performance LaFe (oxy)hydroxide and its mechanisms on phosphate adsorption were studied, and it was shown that Fe optimized the electron structure of La, and Fe/La metal orbital hybridization resulted in the shift of oxygen p character to unoccupied states.
Abstract: Lanthanum (La)-based materials have been recognized as promising adsorbents for aqueous phosphate removal. The incorporation of base metals into La (oxy)hydroxides represents an effective strategy to improve adsorption performance. Understanding how base metals affect phosphate adsorption is challenging but essential for the development of effective materials for phosphorus control. Herein, we demonstrated a high-performance LaFe (oxy)hydroxide and studied its mechanisms on phosphate adsorption. The P K edge X-ray absorption near edge structure (XANES) analysis showed that PO43- was preferentially bonded with La, and the lattice oxygen in LaFe (oxy)hydroxide was demonstrated to be the active site. The O K edge XANES suggested that Fe optimized the electron structure of La, and Fe/La metal orbital hybridization resulted in the shift of oxygen p character to unoccupied states, facilitating phosphate adsorption. Furthermore, surface analysis showed that the pore size and volume were increased due to the introduction of Fe, which enabled efficient utilization of the active sites and fast adsorption kinetics. The dual effects of Fe in LaFe (oxy)hydroxide greatly enhance the effectiveness of La and represent a new strategy for the development of future phosphorus-control materials.

Journal ArticleDOI
TL;DR: In this article, a structural search of the global minimum for neutral and anionic Sin and L 1 is performed for Si-based semiconductor clusters, where the TM-doped Si-sensors have aroused increased attention in a lot of fields.
Abstract: The TM-doped Si-based semiconductor clusters have aroused increased attention in a lot of fields. Here, we have performed a structural search of the global minimum for neutral and anionic Sin and L...


Journal ArticleDOI
Weiyan Du1, Li Yaru1, Xing Xu1, Yanan Shang1, Baoyu Gao1, Qinyan Yue1 
01 Jan 2019
TL;DR: The high carbohydrate-content biomaterials, shaddock peels (SP), were used as the bio-host for supporting the bimetallic oxides, zirconium (Zr) and lanthanum (La) hydroxides, forming the SP-Zr-La composites, indicated that some rod-like or amorphous nanoparticles were anchored inside the SP, which exerted more available interface interactions toward the adsorbed ions.
Abstract: Bimetallic oxides nanocomposites always exhibited the better phosphate capacities than those monometallic oxides samples Herein, the high carbohydrate-content biomaterials, shaddock peels (SP), were used as the bio-host for supporting the bimetallic oxides, zirconium (Zr) and lanthanum (La) hydroxides, forming the SP-Zr-La composites Phosphate adsorption properties as well as stability of the novel composites were evaluated The SP-Zr-La composites indicated that some rod-like or amorphous nanoparticles with sizes of 20–150 nm were anchored inside the SP, which exerted more available interface interactions toward the adsorbed ions The Zr-La species were pH-sensitive and adsorption capacity of phosphate by SP-Zr-La was increased with the rise in temperature As the molar ratio of accompanying ions/phosphate was increased from 0 to 10 times, the SP-Zr-La was observed with the adsorption loss of 272–367% Whereas the adsorption loss of cationic SP (grafted with quaternary ammonium groups) was calculated up to 862–916%; this indicated the more feasibility of SP-Zr-La in real applications In addition, the stability of impregnated Zr and La species in SP-Zr-La was greatly improved by the bio-carrier through the “shielding effect” in a low HA surrounding

Journal ArticleDOI
01 Oct 2019-Vacuum
TL;DR: In this article, the influence of doping with lanthanum (La3+) on structural, conductive properties and phase composition of ceramics based on barium titanate, obtained by solid phase synthesis, followed by thermal annealing at 800 °C for 5 h.

Journal ArticleDOI
TL;DR: ZSM-5 zeolite beads (ZB) modified with lanthanum (La) were prepared by impregnating ZB in a linthanum nitrate solution (denoted as La-ZB), which confirmed the doping of La on the surface of the ZB as discussed by the authors.

Journal ArticleDOI
TL;DR: It was found that the photocatalytic activity of doped samples, as investigated by using methyl orange dye under visible lights, improved in response to the increase in La concentration, and the decomposition of methyl orange reached 85.86% after 150 min in visible light.
Abstract: Lanthanum (La)-doped zinc oxide nanoparticles were synthesized with different La concentrations by employing a gel combustion method using poly(vinyl alcohol) (PVA). The as-synthesized photocatalysts were characterized using various techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), photoluminescence (PL) spectroscopy, and UV–visible absorption spectroscopy. The average size of ZnO nanoparticles decreased from 34.3 to 10.3 nm with increasing concentrations of La, and the band gap, as evaluated by linear fitting, decreased from 3.10 to 2.78 eV. Additionally, it was found that the photocatalytic activity of doped samples, as investigated by using methyl orange dye under visible lights, improved in response to the increase in La concentration. The decomposition of methyl orange reached 85.86% after 150 min in visible light using La0.1Zn0.9O as the photocatalyst.

Journal ArticleDOI
TL;DR: In this article, rare earth metal oxide-supported iron catalysts were effectively prepared via a simple co-precipitation method, and their catalytic activity for methane decomposition was evaluated for the first time.

Journal ArticleDOI
TL;DR: The high catalytic reactivity of homoleptic tris(alkyl) lanthanum La{C(SiHMe2 )3 }3 is highlighted by C-O bond cleavage in the hydroboration of esters and epoxides at room temperature, tolerates functionality typically susceptible to insertion, reduction, or cleavage reactions.
Abstract: The high catalytic reactivity of homoleptic tris(alkyl) lanthanum La{C(SiHMe2 )3 }3 is highlighted by C-O bond cleavage in the hydroboration of esters and epoxides at room temperature. The catalytic hydroboration tolerates functionality typically susceptible to insertion, reduction, or cleavage reactions. Turnover numbers (TON) up to 10 000 are observed for aliphatic esters. Lanthanum hydrides, generated by reactions with pinacolborane, are competent for reduction of ketones but are inert toward esters. Instead, catalytic reduction of esters requires activation of the lanthanum hydride by pinacolborane.

Journal ArticleDOI
TL;DR: In this article, the surface of graphene oxide was functionalized with lanthanum to produce porous flowered graphene oxide-lanthanum fluoride (GO-LaF) nanocomposite for adsorptive removal of As(V) from aqueous system.

Journal ArticleDOI
TL;DR: In this paper, a series of La2O3-NiO-Al2O4 catalysts promoted by different loading of lanthanum were prepared via the hydrolysis-deposition method to improve the catalytic performance of nickel-based catalyst for CO2-CH4 reforming.

Journal ArticleDOI
TL;DR: In this paper, a pyro-hydrometallurgical approach involving a thermal treatment was proposed to convert rare-earth phosphates into oxides, which can be more easily leached by mineral acids (HCl and H2SO4) in a further leaching step.


Journal ArticleDOI
TL;DR: In this article, six different slags generated by reductive smelting of the same bauxite residue sample were treated by high-pressure acid leaching (HPAL) with HCl and H2SO4 to selectively extract rare earth elements (REEs).

Journal ArticleDOI
TL;DR: Lanthanum and cerium were the elements most easily removed by all tested sorbents when tested in single- or multi-solute solutions, in batch and column assays.
Abstract: The use of rare earth elements is a growing trend in diverse industrial activities, leading to the need for eco-friendly approaches to their efficient recovery and reuse. The aim of this work is the development of an environmentally friendly and competitive technology for the recovery of those elements from wastewater. Kinetic and equilibria batch assays were performed with zeolite, with and without bacterial biofilm, to entrap rare earth ions from aqueous solution. Continuous assays were also performed in column setups. Over 90% removal of lanthanum and cerium was achieved using zeolite as sorbent, with and without biofilm, decreasing to 70% and 80%, respectively, when suspended Bacillus cereus was used. Desorption from the zeolite reached over 60%, regardless of the tested conditions. When in continuous flow in columns, the removal yield was similar for all of the rare earth elements tested. Lanthanum and cerium were the elements most easily removed by all tested sorbents when tested in single- or multi-solute solutions, in batch and column assays. Rare earth removal from wastewater in open setups is possible, as well as their recovery by desorption processes, allowing a continuous mode of operation.

Journal ArticleDOI
TL;DR: In this study, the effects of La and Ce in solutions and soil samples on root growth, mitotic index (MI) and frequency of aberrant cells (FAC) were assayed using one of the most convenient objects for testing of cytotoxicity - onion Allium cepa L.

Journal ArticleDOI
TL;DR: In this article, structural analysis of LaFe1−yCoyO3 and La1−xSrxFe0.5Co0.60 nano-particles with y = 0.00, 0.15, 0, 30, 45, and 0.60 were prepared using the citrate method.
Abstract: In this study, LaFe1−yCoyO3 and La1−xSrxFe0.5Co0.5O3 nano-particles with y = 0.00, 0.25, 0.50, 0.75, and 1.00 and x = 0.00, 0.15, 0.30, 0.45, and 0.60 were prepared using the citrate method. The samples were characterized by X-ray diffraction, infrared spectroscopy, scanning electron microscopy, and tunneling electron microscopy. Detailed structural analysis of the samples was conducted through refining via the Rietveld method and using the Fullprof program. The structural analysis of LaFe1−yCoyO3 revealed that orthorhombic-toward-rhombohedral phase transition with Co doping and rhombohedral-to-cubic phase transformation took place in La1−xSrxFe0.5Co0.5O3 due to an increase in the Sr content. The electrical conductivity and catalytic activity of La1−xSrxFe1−yCoyO3 were also investigated. The results of the structural analysis of LaFe1−yCoyO3 pointed out to the presence of Co2+, Co3+, Fe3+ and Fe4+ ions that would contribute to the overall oxidation activity of these samples. In addition, substituting the lower ionic radius transition metal would decrease the temperature of the complete CO conversion. The increase in the catalytic activity of the sample y = 0.50 in series of LaFe1−yCoyO3 could be mainly attributed to (i) the presence of Fe3+ O Fe4+ and Co2+ O Co3+ couples, (ii) a rhombohedral structure with higher symmetry, and also (iii) the lower value of activation energy and higher value of σOx/σRed. However, substituting Sr for La could increase the temperature of the CO conversion. LaFe0.5Co0.5O3 exhibited 95% CO conversion at 536 K.

Journal ArticleDOI
TL;DR: Among different removal systems, US/LZF-rGO displayed outstanding sonodegradation performance for degradation of MO, and reusability experiments with this sonocatalyst revealed a less than 10% drop in the degradation efficiency after four adsorption-desorption cycles.

Journal ArticleDOI
TL;DR: In this paper, Aspergillus niger was used to recover lanthanum from spent fluid catalytic cracking catalysts (SFCCC), which accounts for 8170 mg/Kg.