Lanthanum Concentration Research Articles

Effects of calcium concentration, calcium chelators, calcium channel-blockers on Hsp70a expression in Chlamydomonas reinhardtii

In this study, calcium concentration, calcium chelators, and calcium channel blockers that could be effective in triggering the heat shock response in Chlamydomonas reinhardtii were investigated. For this purpose, continuously expressed and heat-inducible transformant C. reinhardtii strains were used, and heterologously expressed arylsulfatase activities were detected. After a short time of heat shock at 40°C, cultures were shifted to 23°C and different concentrations of calcium (0-1 M CaCl2), EGTA (0-50 mM), BAPTA (0-2 mM), lanthanum (0-300 µM), gadolinium (0-350 µM), and verapamil (0-100 µM) applications were performed. To compare the arylsulfatase activity results at the transcript level, HSP70A expression level was analyzed. Arylsulfatase activity was increased with the increase of the calcium concentration, in the presence of calcium chelators, blockers, and parallel results were obtained in HSP70A expression level. These findings support that both extracellular and intracellular calcium influx is effective in the heat shock response of C. reinhardtii.

The structure and optical properties of lithium niobate thin film (LiNbO3) grown on silicon for various lanthanum concentration and molarity

We have successfully deposited lithium niobate thin films on a p-type silicon substrate (100) using Chemical Solution Deposition (CSD) method and spin coating technique. The lithium niobate thin films were doped with Lanthanum with a molarity variation of 1 M, 2 M, 3 M, and 4 M and concentration variation of 0%, 2%, 4%, and 6% on 2 M solubility. Using reflectance data, we found that the energy gap of the niobite thin film at 1 M, 2 M, 3 M, and 4 M solubility are 1.36 eV, 2.79 eV, 2.38 eV, and 1.75 eV, respectively. Meanwhile, lanthanum doped lithium with concentration of 0%, 2%, 4%, and 6% yield an energy gap of 2.75 eV, 3.19 eV, 3.21 eV, and 2.45 eV, respectively. X-ray measurement on Lithium Niobate thin films show a rhombohedral structure with lattice parameter a = b while the c parameter is different.

A detailed investigation of lanthanum substituted bismuth ferrite for enhanced structural, optical, dielectric, magnetic and ferroelectric properties

Lanthanum substituted bismuth ferrites (Bi1-xLaxFeO3) (x = 0.0, 0.015, 0.03, 0.045 and 0.06) was successfully synthesized by using co-precipitation method. Rare earth substitution in bismuth ferrites enhanced the leakage current which is one of the problems faced by the pure bismuth ferrites. The prepared samples were investigated by XRD, SEM, EDX, TEM, FT-IR, UV–vis spectroscopy, BET, LCR for dielectric measurements, VSM for magnetic properties and ferroelectric for electric polarization. XRD pattern showed that the structure of bismuth ferrite was rhombohedral distorted perovskite structure of space group R3c and average crystallite size was determined to increase (19 nm to 35 nm) with increase in lanthanum concentration. Morphology of SEM images was found to be spherical shape. TEM shows average particle size increases from 35 nm to 50 nm. Metal-oxide bonds at 440 cm−1 and 539 cm−1 in IR spectra confirmed the perovskite structure of bismuth ferrites. UV–visible spectroscopy revealed that energy band gap decreased by increasing the Lanthanum concentration. BET shows the surface area increased from 4.79 m2/g to 9.03 m2/g. Dielectric constant increases by increasing the lanthanum concentration. AC conductivity showed maximum value at higher frequency nearly equal to 11 Ω cm−1. Electric modulus gradually increased by increasing frequency which was equal to 4.2 k Ω. Magnetic susceptibility increased by increasing the concentration and maximum value 0.008 cm3/g was observed for (x = 0.06). Magnetization (Ms), remanence (Mr), polarization (Pr) increased whereas coercivity decreased with increasing lanthanum substitution. Such properties make these materials as potential candidates for microwave devices and electromagnetic shielding application.

Structural evolution of La-modified AgNbO3 lead-free ceramics: Perspective from octahedral tilting and tolerance factor

Systematic studies on the structural and microstructural properties as a function of the lanthanum concentration have been performed in AgNbO3-based lead-free ceramics, which were synthesized via the conventional solid-state reaction process. The structural analysis has been carried out at room temperature by the X-ray diffraction technique as well as Raman spectroscopy. A single-phase orthorhombic polycrystalline perovskite structure, without undesired phases, has been confirmed for all studied compositions. Structural distortions, which have been associated with the doping concentration, have been investigated through Rietveld refinement and Raman results. The La3+ ion concentration has also shown an important influence on the Raman spectra, showing a wavenumber shift and a dramatic change in absolute intensity of several bands with the increase of the lanthanum dopant. With a further inclusion of the doping element, a change in the local structural properties is revealed, detecting additional bands in the 90–93 cm−1 and 570−758 cm−1 ranges of Raman spectra. The microstructure is strongly influenced by the additive content, revealing a decrease in grain-size as the La-content increases.

The structural properties of Y1-XLaXBa4Cu7O15+ δ superconductor compound

The eff ect of partial substitution for lanthanum (La) on the structural properties of the compound Y1-xLaxBa4Cu7O15+δ were studied. The variation of (x) are x=0.1, 0.2 and 0.3, which was synthesized by solid state reaction method. The mixed powder was pressed with pressure (7 ton / cm2) as a disc (1.5 cm) diameter and a thickness of (0.25 to 0.3 cm). The samples were sintering by 120 °C / hour with a changing rate from room temperature to 850 ° C through 72 hours. XRD analysis using to calculate crystal size, strain and degree of crystallinity. It was found all samples have orthorhombic structure and change of structure with increasing lanthanum concentration. It was shown that the change lanthanum concentrations of all our samples produce a change in the crystal size, strain, degree of crystallinity and lattice parameters.

Effect of alloy composition on wetting behavior of Sn–Co–La alloy on NdFeB substrate

The alloy composition influences the wettability of molten metal at high temperatures. A new Sn–Co–La alloy was used as a surface adhesive for NdFeB material and the wettability and contact surface morphology of the alloy on NdFeB substrate were studied. To explain the connectionism of alloy on NdFeB substrate following lanthanum addition, the interfacial reaction activation energy of the Sn–Co–La/NdFeB system was calculated. The results show that when the percent of cobalt in the alloy is grown, its melting point rises, making it harder to wet on the NdFeB surface. The activation energy of the interfacial contact between the alloy and the NdFeB substrate surface is reduced from 168.371 kJ/mol to 107.062 kJ/mol when the Lanthanum concentration is increased from 0.5 wt% to 1 wt%. The inclusion of lanthanum increases the thickness of intermetallic compounds and improves the wettability of the alloy and substrate.

Levels and environmental risks of rare earth elements in a gold mining area in the Amazon

Artisanal gold (Au) mining may have increased the concentrations of rare earth elements (REEs) in the Serra Pelada mine (southeastern Amazon, Brazil), which has not been evaluated so far. The objectives of this study were to determine the concentrations of cerium (Ce), lanthanum (La), scandium (Sc), and yttrium (Y) in the surroundings of the Serra Pelada mine, as well as the environmental risks associated with these elements. Therefore, 27 samples were collected in agricultural, forest, mining, and urban areas, and submitted to chemical and particle size characterization. The concentrations of REEs were quantified by inductively coupled plasma mass spectrometry (ICP-MS) and used to estimate pollution indices and environmental risks of the studied elements. All REEs had higher levels in the anthropized areas when compared to the forest area, except Sc in the mining and urban areas. Pollution load indices revealed that all areas are contaminated (>1) by the combined effect of REEs, especially the agricultural areas (index of 2.3). The element of greatest enrichment in the studied areas was Y, with enrichment factors of 18.2, 39.0, and 44.4 in the urban, agriculture, and mining areas, respectively. However, the potential ecological risk indices were low (<150) in all areas, indicating that there are no current environmental risks by the studied REEs.

Manganese oxides/LaMnO3 perovskite materials and their application in the oxygen reduction reaction

Manganese-based materials can catalyze the oxygen reduction reaction (ORR), although their activity is known to depend on the crystalline phases and on the concentration of surface-active species. In the present study, we have optimized these two parameters to obtain improved catalysts for ORR. A sol-gel method was used to synthesize LaMnO3-manganese oxides composites with different lanthanum-to-manganese atomic ratios. The synthesized materials, which can be described as La1-xMnOz, were tested under ORR conditions and characterized by several physicochemical techniques such as SEM, XPS, EDX or XRD. It was found that the concentration of lanthanum governs the formation of different crystal phases and determines the crystallite size. Besides, high values of x tend to increase the surface concentration of manganese and therefore to produce more active sites for ORR. Among the materials analysed, La0.6MnOz mixed with carbon black (Vulcan) showed the best electrocatalytic performance. The high tolerance to methanol makes this electrocatalyst a promising alternative to substitute Pt-based materials in alkaline electrolytes.

SYNTHESIS, CHARACTERIZATION AND PHOTOCATALYTIC ACTIVITY OF NANOCRYSTALLINE LANTHANUM DOPED MOLYBDENUM OXIDE

Organic dyes effluents are a foremost source of environmental pollution and hence its removal has become an important area of research these days. A series of different concentrations of Lanthanum- Molybdenum Oxide catalysts, LMO (1%, 5%, 10%, 15% and 20wt.%) were prepared by a sol gel method and calcined at 500°C. Thus, synthesized LMO catalysts were characterized by Powder X-ray diffraction analysis (XRD), Flame Emission scanning electron microscopy (FESEM,) Energy-dispersed X-ray analysis (EDX), RAMAN Spectroscopy and Thermo-gravimetric analysis (TGA). The photocatalytic properties of LMO nanoparticles were investigated via methyl orange (MO) and bromothymol blue (BTB) as a model organic compound in aqueous solution under visible light irradiation. More than 80% and 60% degradation of MO and BTB dye within 150 minutes indicating the excellent photocatalytic activity of as prepared catalysts.

Lanthanum carbonate grafted ZSM-5 for superior phosphate uptake: Investigation of the growth and adsorption mechanism

• Synthesis of LC-ZSM-5 is optimized to achieve high adsorption capacity. • Agglomeration will occur as synthesis time of LC-ZSM-5 increases. • Thermodynamic study indicates a spontaneously physicochemical adsorption. • Adsorption mechanism includes electrostatic attraction and ligand exchange. • Adsorption capacity of LC-ZSM-5 maintains near 70% after 5 cycling runs. High-efficiency phosphate removal from wastewater is crucial for protecting environmental stability. In this work, a lanthanum carbonate grafted ZSM-5 adsorbent (LC-ZSM-5) was prepared and optimized by a Box-Behnken design. The higher temperature, molar ratio of urea to lanthanum and initial lanthanum concentration are beneficial for LC-ZSM-5 synthesis, and the adsorption capacity of LC-ZSM-5 under optimistic conditions was 91.2 mg-PO 4 3- /g. The growth mechanism indicates that the LC particles grow larger with synthesis time and finally agglomerate, and 12 h is the best synthesis time. The thermodynamic results show that phosphate adsorption over LC-ZSM-5 is a spontaneously exothermic and combined physicochemical adsorption process. Kinetic studies suggest that higher temperatures help increase the phosphate adsorption rate, and chemical adsorption plays an important role during adsorption with an activation energy E a of 42.7 kJ/mol. The adsorption mechanism of the phosphate uptake process includes electrostatic attraction and ligand exchange, through which LC is changed to lanthanum phosphate (LP) during adsorption. Finally, the regeneration study revealed that LC-ZSM-5 still exhibited a high adsorption capacity after 5 cycles, showing its satisfactory regeneration ability and potential industrial application.

Element concentrations, histology and serum biochemistry of arctic char (Salvelinus alpinus) and shorthorn sculpins (Myoxocephalus scorpius) in northwest Greenland

The increasing exploratory efforts in the Greenland mineral industry, and in particular, the proposed rare earth element (REE) mining projects, requires an urgent need to generate data on baseline REE concentrations and their potential environmental impacts. Herein, we have investigated REE concentrations in anadromous Arctic char (Salvelinus alpinus) and shorthorn sculpins (Myoxocephalus scorpius) from uncontaminated sites in Northwest Greenland, along with the relationships between the element concentrations in gills and liver, and gill histology and serum biochemical parameters. Concentrations of arsenic, silver, cadmium, cerium, chromium, copper, dysprosium, mercury, lanthanum, neodymium, lead, selenium, yttrium, and zinc in gills, liver and muscle are presented. No significant statistical correlations were observed between element concentrations in different organs and gill histology or serum biochemical parameters. However, we observed positive relationships between age and histopathology, emphasizing the importance of including age as a co-variable in histological studies of fish. Despite no element-induced effects were observed, this study is considered an important baseline study, which can be used as a reference for the assessment of impacts of potential future REE mine sites in Greenland.

Photocatalytic and Photoluminescence Studies of La, Ce, and Dy Co-doped ZnO Nanoflowers

In the present work, ZnO nanoparticles were doped with varying concentration of lanthanum (La), cerium (Ce), and dysprosium (Dy) using a simple and cost-effective co-precipitation approach at low temperatures. The resulting powders were calcined at 500 °C for 1 h using a muffle furnace, to produce La, Ce, and Dy-co-doped ZnO nanoparticles with varying stoichiometry, viz. (Zn0.97La0.01Ce0.01Dy0.01O, Zn0.94La0.02Ce0.02Dy0.02O, Zn0.91La0.03Ce0.03Dy0.03O, Zn0.88La0.04Ce0.04 Dy0.04O, and Zn0.85La0.05Ce0.05Dy0.05O). This is a simple approach for doping and does not require a complex equipment, harmful chemical, or sophisticated machinery. The synthesized powders were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM) for studying the structure, purity, and grain morphology. Compositional study was done using EDS (SEM/EDS Hitachi 3600 N). The average crystallite size was calculated using XRD and was found to be 35 nm, and it also indicated a hexagonal wurtizite structure with no secondary peaks. A change in morphology from nanorods to nanoflowers was observed as the concentration of dopants increased. Photoluminescence (PL) spectra indicated a redshift in the absorption edge toward the visible region of solar spectrum and this was further confirmed by diffuse reflectance spectra (DRS). The photocatalytic properties of undoped and La, Ce, and Dy-co-doped ZnO nanoparticles were observed by examining the photodegradation of Rhodamine B dye under UV irradiation. The elimination of dye color indicated the total degradation of organic molecule. The results revealed that ZnO photocatalyst with La, Ce, and Dy co-dopant concentration Zn0.85La0.05Ce0.05Dy0.05O exhibited the best photocatalytic performance (95%) as compared to undoped ZnO. The improved photocatalytic performance can be attributed to the increased surface oxygen vacancies and adsorption capacity. The delay in recombination of charge carriers due to creation trap states in the bandgap of ZnO further improves the photocatalytic performance of doped samples.

Characterisation of rare earth elements from Malaysian ion-adsorption clay

This article aims to characterise Malaysian ion-adsorption clay rare earth element (IAC REE) ore in Malaysia. The study's goal was to determine the physical and chemical properties of ion-adsorption rare earth ore to provide direction to the industry for future research on rare earth element (REE) extractions. The mineral composition and mineral phase of the sample were analysed using X-ray diffraction (XRD) and X-ray fluorescence (XRF), respectively. The ore samples were mostly made up of SiO2 (60.09%) and Al2O3 (24.63%), and were mainly hosted in quartz, feldspar, kaolinite, halloysite, and coesite. The sample's elements were identified using inductively coupled plasma mass spectrometry (ICP-MS) and the result shows that the ore contained 62.21% of light rare earths (LREEs) and 37.79% of heavy rare earth (HREEs). The concentration of yttrium, lanthanum, cerium and neodymium was significant among other REEs. This finding is crucial for future reference on rare earth element’s extraction.

Залежність структури ливарних сплавів системи Al-Ni-La від їх хімічного складу

The peculiarities of cast Al-Ni-La alloys structure formation depending on the content and ratio of the main components are analyzed in the work. It is shown, that so far the studied system has been considered mainly for the creation of amorphous materials. At the same time, Al-Ni and Al-La systems have phase diagrams that allow us to consider double and triple alloys of these systems to create promising creep-resistant alloys for casting. At the same time, the peculiarities of their structure formation in this context were not determined. Samples with different contents of nickel and lanthanum were prepared for research and analyzed how each of the elements, their number and ratio affect the formation of their structural-phase state. It is shown, that low nickel content of about 2 wt. % and lanthanum up to 5 wt. % eutectic is formed like thin almost monolithic intermetallic plates. As the number of components increases and, accordingly, the number of eutectics increases, the dispersion of its components increases. The analysis of the alloy structure dependence due to studied system on their chemical composition showed that, most likely, during the formation of the eutectic, Al11La3 particles, which may have the form of nanosized fibers, are formed first of all. It should be noted that at the eutectic content of lanthanum in the alloys no primary-formed Al11La3 particles were found. This may indicate that nickel shifts the eutectic concentration of lanthanum toward higher values. At the same time, at the hypoeutectic concentration of lanthanum and the hypereutectic concentration of nickel, some Al11La3 formations were outside the regions of the main eutectic with nickel aluminide. Such questions necessitate further studies of the aluminum angle of the triple state diagram of the Al-Ni-La system. Keywords: Al-Ni-La system, creep-resistant cast aluminum alloys, structure, eutectic.

Identification of rare-earth minerals associated to K-feldspar: Capacsaya project in Peru

A recently discovered the rare-earth-rich site in Capacsaya, located at 123 km northwest of Cusco, at the south of Peru, contains significant quantities of light and heavy rare-earth elements such as neodymium, lanthanum, cerium, europium, and yttrium. This work reports the identification of rare-earth elements and their associated minerals using scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction analyses. Five (5) samples extracted from different locations at the Capacsaya site were characterized and identified K-feldspar as the mineral associated with the rare-earth elements in a representative sample with a high concentration of lanthanum and cerium. The results showed rare-earth elements contained within the mineral phase monazite, being cerium the dominant element in the phase (La, Ce, Nd)PO_4. Finally, through the electrostatic separation process we demonstrate that it was possible to achieve an efficient separation of the K-feldspar phase in the particle size range 75–150 upmum.

Differential tissue accumulation in the invasive Manila clam, Ruditapes philippinarum, under two environmentally relevant lanthanum concentrations.

Among the environmental emerging concern rare earth elements, lanthanum (La) is one of the most common and reactive. Lanthanum is widely used in numerous modern technologies and applications, and its intense usage results in increasing discharges into the environment, with potentially deleterious consequences to earthlings. Therefore, we exposed the important food resource and powerful monitoring tool Manila clam to two environmentally relevant concentrations of La (0.3µg L-1 and 0.9µg L-1) for 6days, through water, to assess the bioaccumulation pattern in the gills, digestive gland, and remaining body. The La bioaccumulation was measured after 1 (T1), 2 (T2), and 6 (T6) days of exposure. Lanthanum was bioaccumulated after 2days, and the levels increased in all tissues in a dose-dependent manner. When exposed to 0.3µg L-1, the enrichment factor pattern was gills > body > digestive gland. However, when exposed to 0.9µg L-1, the pattern appears to change to gills > digestive gland > body. Tissue portioning appears to be linked with exposed concentration: In higher exposure levels, digestive gland seems to gain importance, probably associated with detoxification mechanisms. Here, we describe for the first time La bioaccumulation in these different tissues in a bivalve species. Future studies dealing with the bioaccumulation and availability of La should connect them with additional water parameters (such as temperature, pH, and major cations).

Synergistic Improvement in Coating with UV Aging Resistance and Anti-Corrosion via La-Doped CeO2 Powders

Benefitting from a suitable band gap, ceria is an excellent material for UV shielding. By solid solution doping and specific micromorphology, its band gap can be effectively controlled. In this paper, ceria doped with lanthanum via oxalate precipitation is combined with a high-temperature roasting process. The properties of the prepared samples are characterized by UV–Vis diffuse reflectance spectroscopy (DRS), Raman, XRD, FESEM and XPS. The absorption threshold of materials is clearly red-shifted in the ultraviolet band, which originates from the electron-phonon generation. To further reveal the mechanism, the density function theory calculation (DFT) is implemented to study the influence of lanthanum concentrations on ceria’s band gap. It is demonstrated that the band gap can even be narrowed to 2.97 eV by optimizing the sintering temperature and lanthanum-doped concentration. To investigate its improved anti-aging properties under ultraviolet rays, different amounts of 5% lanthanum-doped ceria is mixed with an Al-based coating and then coated on the Q235 steel. Combined with an ultraviolet light irradiation experiment and electrochemical test technology, the corrosion resistance of the modified coatings is evaluated. The coating with 20% La-doped ceria provides the best corrosion resistance performance.

Microstructure, magnetic, and dielectric interplay in NiCuZn ferrite with rare earth doping for magneto-dielectric applications

The homogeneous conglomerate of ferrite oxide samples with increasing concentration of Neodymium and Lanthanum in the steps 0.02 with the chemical formula Ni0.6Cu0.2Zn0.2Fe2-x(Nd0.5La0.5)xO4 (0 ≤ x ≤ 0.10) were achieved by novel citric acid-metal nitrate sol–gel auto-ignition method. The nano-regime crystallites products were achieved by using Ni, Cu, Zn, La, Nd and Fe nitrates and keeping the metal nitrate to citrate ratio 1:1. The products of ensured recipe in the form of chemical formula resulted in precursor powders were calcined for removal of desiccated impurities. The ready blends were subjected to an exhaustive examination with distinctive characterizations. The completion of the reaction and phase formation temperature was confirmed by thermal analysis and structural confirmations were received by X-ray diffraction (XRD), Scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) spectra. The analytics regarding the local symmetry in crystalline solids and understandings about the ordering phenomenon were discussed with the support of FTIR spectra. The diffractograms contributed to the corroboration that the powders obtained were bearing single phase and spinel structure. Evaluation of TEM and DLS confirms fine particle nature of the particles. SEM analysis and EDAX indicated that the samples were having dense, homogeneous and expected stoichiometric cation ratios. The neodymium and lanthanum content influenced the measured saturation magnetization negatively and coercivity positively. The heightened values in electrical conductivity, high ε′ and low dielectric losses in combination with high saturation magnetization, low coercivity, observed in the present samples make them prospect candidate for microwave and electromagnetic shielding applications.

Hypothetical Soil Thresholds for Biological Effects of Rare Earth Elements

Objectives: Anthropogenic exposures to rare earth elements are poorly known and there is limited information on their toxicity and ecotoxicity. At the same time, world production of rare earth elements has doubled every 15 years over the last half-century, and high environmental concentrations of gadolinium and lanthanum have already been found. The current review aims to give some estimates of overall exposures and an initial in-depth appraisal of thresholds for effects on agricultural soil. The results are envisaged to be used in initial assessments of agricultural soil where the natural concentrations have been anthropogenically enhanced.&#x0D; &#x0D; Methods: An extensive review has been made of available scientific literature. Criteria have been established for the selection and analysis of eligible research. For instance, only effects on soils with vegetation have been included in the assessment of biological effects. A species sensitivity distribution based on 25% inhibition of organism functions has been used to establish thresholds for effects on soil organisms. &#x0D; &#x0D; Results: Around the year 2000, mean anthropogenic contributions of lanthanides in European soil regions were at most a few per cent of the total soil content. Since then, they should have increased considerably. The proposed hypothetical threshold for agricultural soils is 1125 mg total rare earth element per kg of soil. This threshold is about 8 times the natural soil concentration.&#x0D; &#x0D; Conclusions: If this result holds up to scrutiny, it implies that general anthropogenic pollution by rare earth elements will not be a threat to agricultural sustainability for the coming generation. A preliminary assessment suggests that this threshold would also protect humans from adverse effects due to secondary exposure.

Phosphate-lanthanum coated sewage sludge biochar improved the soil properties and growth of ryegrass in an alkaline soil

The reclamation of alkaline soils remains challenging while the application of biochar has been proposed as a viable measure to rehabilitate soil fertility. The objective of the current pot study was to evaluate the efficacy of various P-La modified sewage sludge biochars (SSBC, La-SSBC, SSBC-P, La-SSBC-P) on soil phosphate-retention and ryegrass (Lolium perenne L.) growth in an alkaline soil (excess CaCO3). The results revealed that germination percentage, plant dry biomass, plant height, and the total amount of P in the ryegrass leaves were significantly (P < 0.05) improved under La-SSBC-P treatment as compared to other treatments. La-SSBC-P treatment significantly altered the chemical characteristics of post-harvest alkaline soil, such as pH, electrical conductivity (EC), cation exchange capacity (CEC), soil organic matter (SOM), limestone (CaCO3), phosphate, and lanthanum contents. In comparison to the SSBC treatment, soil available phosphorous (AP) contents under La-SSBC-P were enhanced by 6.7 times after loading biochar with P and La (La-SSBC-P). After the plantation of ryegrass, concentration of lanthanum in the soil was negligible. The contents of CaCO3 reduced by 76.2% after La-SSBC-P biochar treatment, compared to the cultivated control. This phenomenon clearly indicated that lanthanum was reduced due to the precipitation with limestone, which was proposed based on the data of X-ray diffraction (XRD) analysis. Overall, results showed that the P-loaded lanthanum decorated biochar (La-SSBC-P) could be used as a potential substitute for P-fertilizer under the experimental conditions. However, field experiments are required to confer the efficiency of La-SSBC-P as P fertilizer in different soils.