353 results about "Europium" patented technology

The invention provides a samarium / europium / gadolinium-containing zirconium hydride block as well as a preparation method and application thereof, and relates to the technical field of radiation shielding materials. The zirconium hydride block containing samarium / europium / gadolinium comprises the following elements in percentage by mass: 95% < = Zr < = 99.5%, 0% < = Gd < = 5%, 0% < = Sm < = 5%, 0% < = Eu < = 5% and 0% lt. Gd + Sm + Eu < = 5%. The preparation method comprises the following steps: respectively hydrogenating sponge zirconium, metal gadolinium, metal europium and metal samarium to respectively obtain corresponding hydride powder; weighing zirconium hydride powder, gadolinium hydride powder, europium hydride powder and samarium hydride powder according to a required proportion, and uniformly mixing under a protective atmosphere; and carrying out pressure sintering on the mixed powder, and carrying out secondary hydrogenation to obtain the zirconium hydride block containing samarium / europium / gadolinium. According to the invention, the absorption of the material to low-energy-segment neutrons can be obviously improved; and the preparation of the zirconium hydride block containing samarium / europium / gadolinium and the accurate regulation and control of doped elements are realized.

The invention belongs to the field of magnetic materials, and particularly discloses europium-based silicate as well as a preparation method and application thereof. The general chemical formula of the europium-based silicate is Eu2SiO4, and the europium-based silicate is subjected to secondary magnetic phase change from a paramagnetic state to a ferromagnetic state at the magnetic phase change temperature of 5.8 K; and at the temperature of 5.5 K, when the magnetic field change is 0-2T, the maximum magnetic entropy change is greater than 10J. Kg <-1 >. K <-1 >. The europium-based silicate disclosed by the invention generates paramagnetic to ferromagnetic phase change near the liquid helium temperature, is accompanied by a low-magnetic-field giant magnetothermal effect near the magnetic phase change temperature, shows large magnetic entropy change and refrigerating capacity near the liquid helium temperature, and has a wide application prospect in the field of magnetic refrigeration in a liquid helium temperature region.

The invention relates to a red fluorescent material excited by blue light, an LED device and fluorescent ceramic. The chemical formula of the red fluorescent material is La (2-x) MgNbO6.5: xEu < 3 + >, wherein x is more than or equal to 0.01 and less than or equal to 0.1. The preparation method comprises the following steps: weighing lanthanum oxide, magnesium oxide, niobium oxide and europium oxide raw materials according to a stoichiometric ratio, grinding and uniformly mixing; sintering the uniformly mixed powder in a muffle furnace at high temperature, and cooling to room temperature to obtain the red fluorescent material. Compared with the prior art, the novel oxide-based red fluorescent powder prepared by the invention can emit positive red light of which the central wavelength is 616nm under the excitation of 465nm blue light, and can be used for white light LED (Light Emitting Diode) luminescent devices and fluorescent ceramics.

The invention discloses an acoustic response light-emitting composite nanomaterial as well as a preparation method and application thereof, and belongs to the technical field of light-emitting composite nanomaterials. The acoustic response luminescent composite nano material provided by the invention comprises hollow mesoporous silica nano particles and europium-doped barium titanate nano particles loaded on the surfaces of the hollow mesoporous silica nano particles and in mesopores; the chemical formula of the europium-doped barium titanate nanoparticles is BaTiO3: Eu < 3 + >; the mass ratio of the hollow mesoporous silica nanoparticles to the europium-doped barium titanate nanoparticles is 1: (0.8-1.5). The sound response luminescent composite nano material provided by the invention can realize detection of sound intensity, and has good temperature stability, and meanwhile, the preparation method is simple and low in cost.

The invention belongs to the field of fluorescence detection, and particularly relates to a ratio-type fluorescent nanoprobe for specifically detecting tetracycline antibiotics as well as a preparation method and an application method of the ratio-type fluorescent nanoprobe. The nano-probe is a europium modified zinc gallium germanate nano-material, and is prepared by amino modification, citric acid modification and europium modification of the zinc gallium germanate nano-material. The probe can be specifically combined with tetracycline antibiotics; the fluorescent probe has two different fluorescence emission intensities, so that interference can be effectively eliminated, and the detection accuracy is high. And the synthesis method is simple and low in cost. The ratio type fluorescent nanoprobe provided by the invention also can realize the change of different colors under an ultraviolet lamp, can realize quantitative visual detection of tetracycline by combining the RGB value and the tetracycline concentration change, and can realize rapid on-site detection of tetracycline in a sample without the help of a fluorescent instrument. The tetracycline fluorescent probe is stable in optical performance, not prone to photobleaching, high in tetracycline recognition capacity, wide in response range (0.2-70 [mu] M) and low in detection limit, and has remarkable industrial application potential.

The invention discloses a europium-based metal-organic framework as well as a preparation method and application thereof, and belongs to the technical field of bioassay materials. The preparation method of the europium-based metal-organic framework comprises the following steps: adding europium salt, H4BTA-2OH and ascorbic acid into a binary solution, and sequentially performing ultrasonic treatment, heating and post-treatment to prepare the europium-based metal-organic framework (the molecular formula is {[(CH3) 2NH2] [Eu (BTA-2OH) (H2O) 2]. 4H2O} n). In addition, the invention also discloses an application of the europium-based metal-organic framework in detection of a bacillus anthracis biomarker 2, 6-dipicolinic acid (DPA). The europium-based metal-organic framework Eu-MOF prepared by the method can rapidly detect 2, 6-dipicolinic acid, and has high selectivity and sensitivity, and the excellent fluorescence sensing ability means that the europium-based metal-organic framework Eu-MOF is a potential bacillus anthracis detection material.

The invention belongs to the technical field of magnetic refrigeration, and particularly discloses a rare earth europium-based zirconate magnetic refrigeration material and a preparation method and application thereof. The general chemical formula of the rare earth europium-based zirconate magnetic refrigeration material is (Eu1-xMx) (Zr1-yNy) O3, M is any one of Ca, Sr or Ba, N is any one of Nb, Ta, Ti or Hf, x is more than or equal to 0 and less than or equal to 0.5, y is more than or equal to 0 and less than or equal to 0.5, and the magnetic phase transition temperature of the rare earth europium-based zirconate magnetic refrigeration material is less than 10K. The magnetic refrigeration material shows excellent magnetocaloric performance near the liquid helium temperature, and is expected to be applied to the liquid helium temperature zone magnetic refrigeration technology; and the preparation method is simple in process, safe and environment-friendly, and can be applied to industrial production.

The invention discloses a cobalt-iron layered double-metal hydroxide water treatment catalyst, which is characterized in that the cobalt-iron layered double-metal hydroxide is doped with europium element. Compared with existing ferrocobalt layered double hydroxides, after europium is doped, europium can generate a synergistic interaction effect with iron and cobalt, so that the catalytic activity of the material is remarkably improved.

The invention discloses a rare earth metal doped transition metal electrocatalyst and a preparation method and application thereof, the chemical formula of the catalyst is Eu-CoS1.097, the catalyst is of a crystalline and amorphous structure, and the Eu element exists in a monatomic form; the preparation method comprises the following steps: (1) dissolving polyvinylpyrrolidone and NH2-H2BDC in a solvent to obtain a mixed solution; (2) adding cobalt salt and europium salt into the mixed solution, uniformly mixing, and carrying out hydrothermal reaction to obtain an EuCo-MOF precursor; and (3) adding the EuCo-MOF precursor and thioacetamide into a solvent, and carrying out hydrothermal reaction, so that TAA releases S < 2->, and etching to obtain the rare earth metal doped transition metal electrocatalyst with a hollow spherical structure. According to the catalyst disclosed by the invention, atomic-scale Eu is doped in cobalt sulfide, so that the activity of the transition metal catalyst is effectively improved; the preparation method is simple and efficient.

The invention belongs to the technical field of nano composite materials, and relates to a preparation method and application of a difunctional nano enzyme Eu (at) Ce-MOF. According to the invention, ceric ammonium nitrate is used as an inorganic metal source, terephthalic acid is used as an organic ligand, and Ce-MOF is synthesized in one step by using a hydrothermal method; and then introducing europium nitrate hexahydrate and sodium citrate to prepare the Eu (at) Ce-MOF composite material through one-step in-situ functionalization. Ce-MOF is functionalized by using europium nitrate hexahydrate, and second metal activity is introduced, so that the bi-metal synergistic effect is realized to enhance the peroxidase-like activity of the composite material; meanwhile, the introduced Eu < 3 + > is used as a recognition element and has specific recognition capability on Pi, specific recognition sites of the Eu-coated Ce-MOF composite material are increased, and the difunctional nano-enzyme with strong enzyme-like activity and specific recognition capability is prepared.

The invention discloses an electrochemical test performed by preparing a novel electrochemical luminescence material and application of the electrochemical luminescence material to an electrochemical luminescence sensor. The invention designs an electrochemical luminescence sensor for detecting carbaryl based on a rare earth metal Eu co-reaction-free promoter complex illuminant. Specifically, the electrochemical luminescence sensor is prepared by taking a complex of rare earth metal europium as a luminescent material and potassium persulfate as a co-reactant. The sensor shows an excellent development prospect in the aspect of carbaryl detection.

The invention discloses a triiodothyronine dissociation agent, a detection kit, a preparation method of the triiodothyronine dissociation agent and application of the triiodothyronine dissociation agent and the detection kit, and the triiodothyronine dissociation agent comprises 10-100 mM of acetic acid-sodium acetate buffer solution, 0.05-1 g / L of ethylene diamine tetraacetic acid disodium salt, 1-10 g / L of perfluoroalkyl ethyl methacrylate, 0.2-1 mL / L of Tween-20 and 0.2-2 mL / L of ProClin 300, the pH (Potential of Hydrogen) of the triiodothyronine dissociation agent is 5.5 + / -1; the kit comprises a triiodothyronine dissociation agent and a reagent strip. According to the present invention, the two sites can be specifically recognized, the sensitivity and the specificity are high, the high-specificity detection on the specific antigen can be achieved, and the low-end sensitivity is high; meanwhile, the interference problem of rare earth europium during detection of triiodothyronine can be solved, and the accuracy of a detection result is further improved.

The invention provides a doped yttrium hydride neutron moderation material and a preparation method and application thereof, and belongs to the technical field of radiation shielding materials. At least one of samarium, europium and gadolinium is doped in yttrium hydride in the form of hydride, and the mass ratio of metal yttrium to metal gadolinium to metal europium to metal samarium is controlled, so that the neutron moderation effect of the neutron moderation material can be improved. According to the invention, at least one of gadolinium hydride, europium hydride and samarium hydride is mixed with yttrium hydride under the protective atmosphere, so that the mass content of each element in the doped yttrium hydride neutron moderation material can be accurately controlled. According to the invention, the mixture is sintered and molded, and the sintering parameters of sintering and molding are controlled, so that the components of the mixture are sintered in a compact state, cracks generated by thermal expansion and cold contraction can be reduced, and the doped yttrium hydride keeps high density and has fewer cracks and defects.

The invention provides a porphyrin bimetal organic framework fluorescent probe, a preparation method and application of the porphyrin bimetal organic framework fluorescent probe in trivalent chromium ion detection. According to the preparation method, 5, 10, 15, 20-tetra (4-carboxyl phenyl) porphyrin and 2-amino terephthalic acid react with europium chloride hexahydrate and terbium chloride hexahydrate, so that the bimetal organic framework fluorescent probe is obtained. The fluorescent probe can be used for detecting Cr < 3 + > in water, and the detection limit is as low as 10.83 nM, so that the fluorescent probe can be used for rapid, high-sensitivity and high-selectivity detection of Cr < 3 + >.

The invention discloses a preparation method of a cellulose nanocrystalline composite film with circular polarization luminescence characteristics. The preparation method specifically comprises the following steps: step 1, synthesizing europium macromolecules; and 2, preparing the coating type circular polarization luminous cellulose composite film according to the product obtained in the step 1. The invention further discloses the cellulose nanocrystalline composite film with the circular polarization luminescence characteristic. The problems that an existing composite film is low in asymmetric factor and unstable in CPL performance are solved.

The invention relates to a lanthanide oxide electrochemiluminescence aptamer sensor with dual signal amplification for detecting acetamiprid as well as a preparation method and application of the lanthanide oxide electrochemiluminescence aptamer sensor. According to the sensor, terbium-doped europium oxide (Eu2O3: Tb < 3 + >) modified by gold nanoparticles (Au NPs) is used as a luminous body, and the electrochemical luminescence performance can be remarkably improved through multiple mechanisms: on one hand, the Au NPs can effectively promote generation of more sulfate free radicals; on the other hand, the surface defect passivation effect and the efficient synergistic effect of energy transfer jointly achieve effective amplification of signals. In addition, the wool ball-shaped Ag NPs is used as a plasma resonance signal amplification source, so that the ECL intensity of the sensor is further enhanced. The prepared electrochemical luminescence sensor with the dual signal amplification effect is used for detecting acetamiprid (ACE), has a wide linear range and a low detection limit, and has a wide application prospect in detection of acetamiprid residues in a water environment.

The invention discloses a double-ligand rare earth fluorescent nanoparticle for sensitively detecting copper ions, the double-ligand rare earth fluorescent nanoparticle is a lanthanide element-based ratio type fluorescent nanoparticle for detecting Cu < 2 + >, and the fluorescent nanoparticle has double emission sites, the fluorescent nano particles show strong blue and red fluorescence at the positions of 423 nm and 618 nm; the preparation method of the double-ligand rare earth fluorescent nanoparticles comprises the following steps: preparing a europium nitrate solution, adding a DMSO solution containing luminol into the europium nitrate solution, then adding a PBS buffer solution into the europium nitrate solution, and stirring at room temperature to obtain a clear and transparent solution containing a precursor Eu-lu complex; the preparation method of the double-ligand rare earth fluorescent nanoparticles is simple, the copper ions can be stably measured for a long time, the stability is good, the preservation time is long, and the double-ligand rare earth fluorescent nanoparticles play an important role in high-sensitivity and visual detection of the copper ions.

The invention discloses europium-doped hydrotalcite for enhancing PVC (polyvinyl chloride) light transmission and a preparation method and application thereof, and belongs to the technical field of high polymer materials and inorganic nanomaterials. Trivalent europium (Eu < 3 + >) is doped into a lattice structure of LDHs (layered double hydroxides) through europium-doped coprecipitation, surface silanization and ultrasonic dispersion technologies; refractive index matching (1.50-1.53) is achieved, and light scattering is reduced. The particle size of the optimized hydrotalcite is controlled to be 50-150 nm, so that the light transmittance of the PVC composite film reaches 93% or above, and meanwhile, the PVC composite film has the characteristic of red fluorescence. Compared with the prior art, the material has the advantages that the transparency is improved, the heat-resistant stability and aging resistance of PVC are remarkably improved, the material is suitable for the fields of transparent films, daylighting panels, optical marks and the like, and the hydrotalcite nano material provided by the invention has the dual effects of refractive index matching and conversion from ultraviolet light to visible light; the light transmittance and the ageing resistance of the PVC material can be obviously improved at the same time.

The invention relates to rare earth doped perovskite quantum dot glass and a preparation method thereof, and belongs to the technical field of inorganic functional materials and optical functional glass. The method comprises the following steps: preparing nanopore SiO2-Al2O3 glass as a matrix by adopting a sol-gel method, adding a lead source and a rare earth europium source, drying and sintering to obtain uniformly-doped porous glass, soaking the uniformly-doped porous glass in a CsBr methanol solution, and generating the CsPbBr3 perovskite quantum dots in situ. In the glass, the CsPbBr3 quantum dots show wavelength-adjustable broadband luminescence, the Eu < 3 + > ions show narrow-band luminescence, and the CsPbBr3 quantum dots and the Eu < 3 + > ions show double-peak reverse fluorescence response under the action of hydrogen chloride gas. The aperture structure can be controlled by adjusting the use amount of the aluminum lactate, so that the size and the luminescence property of the quantum dot and energy transfer between the quantum dot and Eu < 3 + > ions are adjusted, and the luminescence property and the response characteristic are optimized. The material is uniform in doping, stable in structure and suitable for the fields of multiband luminescent devices and gas sensing.

The application discloses a preparation method of a customized porous TMJ prosthesis deposited with europium-doped black phosphorus nanosheets, and comprises the following steps: S1, CBCT is used to shoot medical image data, which is imported into Mimics software to reconstruct a model, the reconstructed model is imported into Geomagic software to simulate bone cutting, and a craniofacial model STL file is obtained; S2, TMJ prosthesis customization design is performed on the craniofacial model STL file; S3, SLM printing technology is adopted to perform 3D printing on the customized TMJ prosthesis model, and a prosthesis entity is obtained; and S4, a polydopamine europium-doped black phosphorus nanosheet surface coating is constructed on the porous region of the prosthesis entity model. The application realizes product customization by adopting computer-aided design and three-dimensional printing technology; the europium-doped black phosphorus nanosheet coating is constructed on the porous region of the prosthesis, the mandibular stump and the buccal region are promoted to grow into bone, the traditional "two-dimensional fixation" is changed into "three-dimensional fixation", and the limitation of screw loosening, falling off and bone resorption is got rid of.

The present invention discloses a dual-emission metal organic framework composite nanomaterial and its application in ratiometric detection of tetracycline antibiotics. The dual-emission metal organic framework composite nanomaterial is loaded with blue carbon quantum dots, adenosine-5'-monophosphate sodium salt and Eu 3+ The UiO-66 metal organic framework material has a size of 20 to 50 nm. The present invention uses adenosine-5'-monophosphate sodium salt to modify the metal organic framework, which increases the rigidity of the material and ensures the Eu 3+ The stable loading of carbon quantum dots into a metal-organic framework material overcomes the difficulty of separating carbon quantum dots in practical applications. The composite nanomaterial utilizes the pre-enrichment effect of the metal-organic framework, using the blue carbon quantum dot signal as a reference signal and the red europium signal as a response signal to achieve ratiometric detection of tetracycline antibiotics. This method offers the advantages of high sensitivity and fast response speed, with a detection limit of 5.6 nM for tetracycline and a response time of only 10 seconds.

The present invention belongs to the fields of catalysts and petrochemicals, and specifically relates to a catalyst, its preparation method, and its application. The catalyst comprises a composite support and an active metal Ni supported on the composite support. The composite support is composed of a modifier and a natural mineral compound, wherein the modifier comprises zirconium and a rare earth metal. The natural mineral is selected from one or more of diatomaceous earth, sepiolite, halloysite, attapulgite, vermiculite, and molybdenite. The rare earth metal is selected from one or more of yttrium, lanthanum, cerium, neodymium, samarium, europium, gadolinium, and ytterbium. The catalyst of the present invention has good structural stability and exhibits high activity and selectivity in the catalytic production of DMS. The catalyst of the present invention exhibits excellent performance in the hydrogenation of DMM to produce DMS, effectively improving DMS selectivity and reducing the production of GBL, BDO, and THF.

This invention belongs to the field of gas sensor technology and discloses a method for preparing europium ferrite nanosensors and their applications. This method utilizes electrospinning technology combined with a specific low-temperature confined-domain calcination process (550℃~700℃) to prepare EuFeO3 nanotubes with a hollow structure and rough surface by taking advantage of the thermal decomposition kinetics differences of poly(p-v) magnets (PVP). This process effectively suppresses excessive repair of lattice oxygen while forming a unique tubular morphology, effectively "freezing" oxygen vacancies (O2) accounting for up to 34.44% on the material surface in situ. v This invention addresses the shortcomings of traditional solid fiber materials by constructing a sensor using a grinding, dispersion, and coating process. Utilizing the dual reactive surfaces of hollow nanotubes and high-concentration oxygen vacancy active sites, it achieves highly sensitive and selective detection of low-concentration ethylene gas released during fruit ripening. This invention solves the problems of small specific surface area and insufficient active sites in traditional solid fiber materials.

The present invention relates to the field of nanomaterial synthesis, and discloses an upconversion luminescent material, a preparation method thereof, and an application thereof. The preparation method of the upconversion luminescent material comprises: (1) first stirring an ytterbium salt solution, an ammonium molybdate tetrahydrate solution, and a rare earth metal salt solution to obtain an intermediate I; the rare earth metal salt in the rare earth metal salt solution is selected from at least one of an erbium salt, a holmium salt, a praseodymium salt, and a europium salt; (2) subjecting the intermediate I to a hydrothermal reaction in a hydrothermal reactor to obtain an intermediate II; and (3) sequentially subjecting the intermediate II to a drying treatment and a calcination treatment to obtain the upconversion luminescent material. The upconversion luminescent material particles prepared by the method of the present invention have an average particle size of nanometer level, a good degree of crystallinity, and good reverse thermal quenching performance.

A luminescent heat-resistant and flame-retardant coating, its preparation method and application belong to the technical field of heat-resistant and flame-retardant materials. The coating comprises the following raw materials in percentage by weight: 30-40% of a first hydroxy acrylic resin, 10-15% of a second hydroxy acrylic resin, 5-10% of an amino resin, 20-30% of a modified flame retardant, 2-5% of a coated luminescent powder, 5-10% of hollow glass microspheres and the balance of a solvent; wherein, the modified flame retardant is an inorganic flame retardant modified by an amino silane coupling agent and hexachlorocyclotriphosphazene; the coated luminescent powder comprises an inner layer and a coating layer, the inner layer is strontium aluminate doped with europium and dysprosium, and the coating layer is alumina. The luminescent heat-resistant and flame-retardant coating of the invention has excellent flame retardant and smoke suppression effects, good heat resistance, water resistance and mechanical properties, and at the same time, the luminescent performance of the coating is stable, and it is suitable for use in fire-fighting equipment.

The invention discloses a series of high-stability negative temperature coefficient heat-sensitive materials based on seven-principal-element high-entropy rare earth stannate and application, and aims to solve the problem that existing stannate heat-sensitive materials with pyrochlore structures cannot meet long-term application in high-temperature environments. The series of heat-sensitive materials are prepared by mixing lanthanum trioxide, neodymium oxide, samarium oxide, europium oxide, gadolinium oxide, dysprosium oxide and tin dioxide with erbium oxide or ytterbium oxide respectively, and the preparation process comprises the steps of wet three-dimensional vibration ball milling, powder calcination, cold isostatic pressing, high-temperature sintering and the like. And finally obtaining the negative temperature coefficient heat-sensitive material with the pyrochlore structure. The electrical property parameters of the series of materials are as follows: B is equal to 13914-14067 + / -1.89% K, and rho 1500 DEG C is equal to 180.26-204.09 + / -1.38% omega.cm. The negative temperature coefficient heat-sensitive material has the negative temperature coefficient characteristic in the wide temperature range of 400-1500 DEG C and shows excellent high-temperature aging stability under the high-temperature condition of 1500 DEG C, and the resistance drift rate of the negative temperature coefficient heat-sensitive material is only 0.7% after an aging test for 500 hours.

The present invention provides an application of a colloidal material for adsorbing metal elements in a groundwater environment, belonging to the fields of environmental protection and water treatment. The colloidal material is illite colloid, and the illite colloid is used for adsorbing the metal elements europium or americium. In the present invention, the initial concentration of europium or americium in water is above 0.3 mg / L, the dosage of the illite colloid is 0.5 - 2 g / L, the contact time of the illite colloid with the water containing europium or americium is above 10 min, and the adsorption reaction temperature is above 20 °C. The illite colloid provided by the present invention can be effectively used for adsorbing europium and americium in water treatment.

The invention relates to the technical field of tungsten alloy materials, in particular to a tungsten alloy wire and a preparation method and application thereof.The tungsten alloy wire is composed of, by mass, 0.4-1.1 wt% of L, 0.001-0.01 wt% of X, 0.001-0.25 wt% of Z and the balance tungsten and inevitable impurities; wherein L is one or more than two of lanthanum, cerium, praseodymium, neodymium, gadolinium and erbium; x is one or more than two of lutetium, europium, ytterbium, dysprosium, holmium, terbium and samarium; the Z comprises oxygen; the wire rod has a wire diameter of 20-60 [mu] m, the wire rod contains a linear L or L compound in the axial direction, and the average radial width D of the L or L compound is less than or equal to 5 nm. According to the tungsten alloy wire, the linear element L is doped between the tungsten matrixes, the radial average width of L is controlled to be smaller than or equal to 5 nm, the wire diameter of the wire can range from 20 micrometers to 60 micrometers, the tensile strength of 5000 MPa or above can be achieved under the wire diameter of 60 micrometers, and the machining performance of the tungsten alloy wire is enhanced.

This invention discloses a method for preparing diamond rare-earth europium (EEUR) color core particles, belonging to the field of non-metallic element materials. The method involves coating a europium oxide suspension onto a single polished silicon wafer, followed by microwave plasma chemical vapor deposition (CPCVD) to form EEUR color core particles. This method allows for the growth of EEUR color core particles on the surface of a diamond film. The absence of obvious traces of Eu₂O₃ nanoparticles on the surface of the EEUR color core particles indicates that the diamond implantation solution within the europium oxide particles rapidly forms the EEUR color core particles during CPCVD, resulting in the diamond core ultimately covering the europium oxide particles, thus forming a core-shell structure, i.e., the diamond rare-earth europium color core particles. The obtained EEUR color core particles are mostly irregularly shaped with a diameter of approximately 8 μm.

This invention discloses a NiAlEu-LDHs photocatalyst, its preparation method, and its application in catalytic CO2 synthesis of syngas, belonging to the field of catalyst preparation technology. The NiAlEu-LDHs photocatalyst is a europium-doped layered double hydroxide prepared by a hydrothermal reaction using nickel, aluminum, and europium sources, possessing a multi-level nanoflower-like structure assembled from nanosheets. The preparation method includes the following steps: a one-step hydrothermal method is used to dissolve the nickel, aluminum, and europium sources, along with urea and ammonium fluoride, in deionized water; the solution is then transferred to a polytetrafluoroethylene-lined autoclave for hydrothermal reaction. This invention introduces europium through a one-step hydrothermal method, constructing a europium-doped nanoflower-like NiAlEu-LDHs photocatalyst. In production applications, this invention's preparation method is simple and novel, with low synthesis cost, easy mass production, and significant application value.