62 results about "Iron nanoparticle" patented technology

A nanocomposite material including iron sulfide (FeS2) nanoparticles, iron oxide (α-Fe2O3) nanoparticles, titanium dioxide (TiO2) nanoparticles, and graphitic carbon nitride (C3N4) nanosheets and a method of its preparation. The nanocomposite is used in a method of forming oxygen gas from water using an applied voltage and photoirradiation, a method of forming hydrogen gas from water using an applied voltage and photoirradiation, and a method of photodegrading organic pollutants using visible light photoirradiation.

The invention discloses iron oxide nanoparticles capable of responding to particle size change in a tumor microenvironment and a preparation method of the iron oxide nanoparticles, and belongs to the technical field of biomedical nano materials. The nano-particle comprises an iron oxide nano-crystal core with the particle size of 3-5nm and a tumor microenvironment response layer coating the surface of the iron oxide nano-crystal core. The response layer contains groups, such as disulfide bonds, enzyme digestion peptide fragments and the like, which can respond to acidic pH, high-concentration reduced glutathione or matrix metalloproteinase and other tumor characteristic stimuli to generate structural changes. In a tumor microenvironment, the hydration particle size of the nanoparticles can be directionally and controllably converted from 3-20 nm to 20-100 nm (or reversely). The preparation method mainly comprises two steps of preparing the core by a thermal decomposition method and modifying the surface response layer. The technical problems of insufficient tumor targeted enrichment capacity, limited imaging contrast and difficulty in balancing permeation and retention caused by fixed particle size of the existing iron oxide nanoparticles are solved, and the accuracy and efficiency of tumor diagnosis and treatment can be remarkably improved.

The invention discloses an ultra-small iron carbide nano-particle and a preparation method and application thereof, the particle size of the ultra-small iron carbide nano-particle is smaller than 10 nm, and the phase composition of the ultra-small iron carbide nano-particle comprises Fe3C, Fe5C2, Fe2C and the like; according to the preparation method, mesoporous silica is taken as a template, organic and inorganic double iron sources are adopted, and the iron carbide nanoparticles which are small in size and uniform in particle size distribution and can be stably dispersed in water for more than 2 months are prepared through the steps of hydrothermal reaction, high-temperature calcination, etching and the like; the ultra-small iron carbide nano-particles obtained by the invention have good activity of various nano-enzymes due to the brand-new image structure and ultra-small size of the nano-particles, and have good T1-magnetic resonance imaging performance.

The invention discloses a binder-free silicon / carbon nanotube composite carbon fiber negative electrode material, a preparation method thereof and an application of the binder-free silicon / carbon nanotube composite carbon fiber negative electrode material in a lithium ion structure energy storage composite material. Carbon fibers are used as a substrate, catalyst nanowires are grown through a hydrothermal method, then dicyandiamide is used as a carbon source and a nitrogen source through a chemical vapor deposition method, and the binder-free silicon / carbon nanotube composite carbon fiber negative electrode material is prepared. Uniform and compact carbon nanotubes doped with nitrogen and embedded with ferrocobalt nanoparticles and arranged in a three-dimensional disordered structure grow on the surface of the carbon fiber, and then ultra-thin nano silicon is uniformly sputtered on a carbon nanotube substrate supported by the carbon fiber through a radio frequency plasma magnetron sputtering technology. The carbon nano tube and the silicon material are effectively compounded together, the advantages of carbon and silicon are combined, and a synergistic effect is achieved. When the obtained silicon-carbon composite material is used as a negative electrode material of a lithium ion structure energy storage composite material, excellent electrochemical performance and cycling stability are shown, and the flexible structure and excellent mechanical performance ensure efficient use of the material in different fields and different application scenes.

The application discloses a kind of by mesoporous Fe 0 Nanometer material enhances the method for activity of gallic acid and application thereof.The present application fixes gallic acid (GA) with redox activity in mesoporous zero-valent iron nanoparticles (Fe 0 NPs), and then encapsulated by SiO2 outer layer containing disulfide bond (denoted as Fe 0 @GA-ss-SiO2NPs). With the help of intracellular glutathione, oxygen molecules are activated by electron transfer, and a large amount of O2 ·‑ And H2O2 are spontaneously generated, and the sustained high concentration of Fe 0 Fe 2+ Further catalyzes the decomposition of H2O2, and generates highly oxidized ·OH free radicals. At the same time, GA quinone derivatives produce 1 O2 by Russel mechanism. In vitro cell experiments confirm that the nanometer material can cause cancer cell ferroptosis, and exhibits high-efficiency cancer cell killing effect at ultra-low dose.

The present invention relates to a catalytically active material comprising non-graphitizing carbon grains with iron nanoparticles dispersed therein, wherein dp, the average diameter of the iron nanoparticles in the non-graphitizing carbon grains, is in the range of 1 nm to 20 nm, D, the average distance between iron nanoparticles in the non-graphitizing carbon grains, is in the range of 2 nm to 150 nm, and Δ, the combined total mass fraction of metal in the non-graphitizing carbon grains, is in the range of 30 wt% to 70 wt% of the total mass of the non-graphitizing carbon grains, and wherein dp, D, and Δ conform to the following relationship: 4.5 dp / Δ > D = 0.25 dp / Δ. Furthermore, the present invention relates to a process for manufacturing the material according to the invention, as well as its use as a catalyst.

This invention relates to a mesoporous single-atom iron nanoparticle self-catalyzing material, its preparation method, and its application. The mesoporous single-atom iron nanoparticle self-catalyzing material comprises: a mesoporous polydopamine framework, and Fe metal catalytic centers chelated in the mesoporous polydopamine framework in the form of single atoms; the mesoporous polydopamine framework has catechol functional groups.

The invention discloses an iron / graphene oxide composite membrane for stable and complete dehalogenation, a preparation method of the iron / graphene oxide composite membrane and application of the iron / graphene oxide composite membrane in a self-circulation reduction system, and belongs to the field of catalytic membrane technologies and water treatment materials. According to the composite membrane, superfine zero-valent iron nanoparticles are uniformly loaded on a graphene oxide sheet layer through an in-situ growth method, and a ferrous iron-ferric iron-reduced graphene oxide cyclic catalytic system is constructed by utilizing a nano confinement effect in the membrane. The ferrous iron activates the sulfite to generate sulfite free radicals and ferric iron, and meanwhile, the ferric iron is reduced and regenerated into the ferrous iron by electrons provided by the reduced graphene oxide, so that a self-sustaining self-circulation catalytic system is formed. The system can realize efficient, rapid and stable degradation and complete dehalogenation of halogenated organic pollutants in a water body. The preparation process is simple, the material stability is high, the catalytic efficiency is remarkable, and the good practical application prospect is achieved.

The invention discloses a composition with a tumor mitochondrial dual regulation effect, temperature-sensitive hydrogel and application, and belongs to the technical field of biological medicine, the composition is composed of a peroxide initiator and a mitochondrial autophagy inhibitor, the peroxide initiator is used for causing mitochondrial damage, and the mitochondrial autophagy inhibitor is used for causing mitochondrial autophagy. The mitochondrial autophagy inhibitor is used for inhibiting mitochondrial The peroxide initiator is indocyanine green, chlorin, iron oxide nanoparticles or Fe-MOFs (Metal-Organic Frameworks); the mitochondrial autophagy inhibitor is chloroquine, 3-methyladenosine or bajulomycin A1; the tumor is specifically melanoma; the combination of the peroxide initiator and the mitochondrial autophagy inhibitor can better inhibit the energy metabolism of tumor cells and inhibit the occurrence and development of tumors, and after the composition is delivered through the temperature-sensitive hydrogel carrier, the treatment effect of the composition on tumors is further improved.

The application relates to the technical field of electroplating, and discloses a chromium electroplating process for improving the hardness of a connector terminal, which comprises the following steps: performing surface pretreatment on the connector terminal, removing surface impurities through ultrasonic cleaning and micro-etching treatment; performing heating treatment on the connector terminal; performing electroplating treatment on the connector terminal by using an electroplating solution comprising trivalent chromium salt, boron nitride nanoparticles, ferroferric oxide nanoparticles, nickel ions, sodium dichromate and chromium alloy additives, so as to form a chromium plating layer; performing passivation treatment on the plating layer; performing low-temperature treatment on the plating layer; and spraying a protective layer on the chromium plating layer. Through the trivalent chromium salt and the sodium dichromate, the trivalent chromium salt is used to reduce hexavalent chromium ions into trivalent chromium, the toxicity of the hexavalent chromium is reduced, the sodium dichromate is used to provide a stable chromium source, the deposition of chromium elements in the electroplating process is ensured, the pollution of hexavalent chromium to the environment and the harm of hexavalent chromium to the health of operators are solved, and the environmental protection and safety of the electroplating process are improved.

The invention relates to the technical field of surface treatment, and discloses a micro-arc oxidation electrolyte which comprises a basic electrolyte for micro-arc oxidation, ferric oxide nanoparticles and a dispersing agent, and the ferric oxide nanoparticles are dispersed in the basic electrolyte. On the basis of the basic electrolyte for micro-arc oxidation, the insoluble coloring agent ferric oxide nanoparticles are added, and in the micro-arc oxidation process, the nanoparticles can be efficiently and stably integrated into a film layer, so that the high-stability red ceramic film which is uniform in color, saturated in color, high in binding force and frosted in texture is prepared. The invention further discloses a preparation method of the micro-arc oxidation electrolyte, a preparation method of the micro-arc oxidation ceramic membrane, a metal workpiece and a terminal product.

The application belongs to the field of environmental functional materials and water treatment technology, and specifically discloses a composite material for simultaneously removing antibiotics and hexavalent chromium in water based on a selenium iron / carbon molybdenum heterostructure, and a preparation method and application thereof. The composite material comprises composite selenium iron nanoparticles and carbon molybdenum, and a heterojunction interface is formed between the selenium iron nanoparticles and the carbon molybdenum. The selenium iron / carbon molybdenum catalyst constructed by the heterojunction engineering utilizes the enhanced active metal circulation reaction and a large number of in-situ generated interface defects to synergistically improve the intrinsic electron transfer capability, constructs a high-efficiency redox reaction interface platform, and efficiently activates the persulfate oxidant, so as to realize the simultaneous and rapid removal of antibiotics and heavy metals in water.

The invention relates to Calpeptin magnetic nano drug-loaded particles of a targeted enrichment membrane layer and application, and belongs to the technical field of biological medicines. The invention designs a Calpeptin magnetic nano drug-loaded particle for targeting a middle membrane layer, the Calpeptin magnetic nano drug-loaded particle adopts a core-shell structure, a magnetic core is composed of superparamagnetic ferroferric oxide nano particles, and the core endows the material with response ability to an external magnetic field, so that the material can be used for preparing the drug-loaded particle. The polymer shell layer is formed by wrapping the surface of the magnetic core with polydopamine (PDA), and Calpeptin is covalently connected to a polydopamine shell. The Calpeptin magnetic nano drug-loaded particle disclosed by the invention solves the technical problem that a composite material cannot efficiently penetrate through an aorta wall and is specifically enriched in a middle membrane layer, so that a reliable directional intervention scheme with in-vivo experimental evidence support is provided for accurate treatment of TAAD.

The invention discloses a preparation method of a magnetic hydroxyapatite material and application of the magnetic hydroxyapatite material in the technical field of environmental governance materials, and the preparation method comprises the following steps: dissolving calcium nitrate tetrahydrate in deionized water as a calcium source at normal temperature by using a hydrothermal method which is simple to operate; the preparation method comprises the following steps: dissolving diammonium hydrogen phosphate in water to serve as a phosphorus source, mixing and stirring the two solutions, adding ferroferric oxide nanoparticles, adjusting the pH value with ammonia water, stirring and reacting, heating in a drying oven for a period of time, cooling to room temperature, and washing and freeze-drying the precipitate to obtain the magnetic hydroxyapatite material. The magnetic hydroxyapatite can be used for adsorbing micro-plastics in a water body. The material has the advantages of high adsorption capacity, high removal efficiency and easiness in recovery.

A Panax notoginseng polysaccharide iron nanoparticle preparation, its preparation method, and its application are disclosed. This invention can effectively prepare Panax notoginseng polysaccharide iron nanoparticles, solving the application problem in the preparation of drugs for treating iron deficiency anemia, inflammatory bowel disease-related anemia, iron deficiency anemia-related colitis, inflammatory anemia, or inflammatory bowel disease. The specific steps are as follows: The crude Panax notoginseng polysaccharide solution is purified using conventional purification methods to obtain purified Panax notoginseng polysaccharide. This purified polysaccharide is dissolved in ultrapure water, and an iron source is added under inert gas protection. After co-precipitation and chemical reduction reactions, the pH value is adjusted, and iron nanoparticles are loaded onto the Panax notoginseng polysaccharide to obtain Panax notoginseng polysaccharide-coated iron nanoparticles. The preparation method of this invention is simple, uses abundant raw materials, and has low production costs. It represents a major innovation in drugs for treating iron deficiency anemia and inflammatory bowel disease-related iron deficiency anemia, and has practical application value.

This invention discloses a pH-responsive soil heavy metal passivating agent and its preparation method. The passivating agent is a carbon nanowire / iron nanoparticle composite material, prepared by polyamide coating of an iron-based material followed by solution spinning and microwave carbonization. The composite material has a one-dimensional nanowire structure and its surface is grafted with acid-base functional groups. The passivating agent can dynamically respond to changes in soil pH and is compatible with both anionic and cationic heavy metal ions. Through adsorption and co-precipitation with metals, it converts active heavy metals into stable states and remains dormant when the heavy metals are in a stable state. The passivating agent of this invention can dynamically respond to soil pH and is compatible with cationic heavy metals in acidic soils and anionic heavy metals in alkaline soils, solving the problems of narrow adaptability and poor passivation specificity of traditional passivating agents. It has excellent passivation effects on various heavy metals such as mercury and cadmium.

This invention relates to the field of electromagnetic wave absorbing materials, specifically to a Fe@Fe / SiO2 gradient impedance electromagnetic wave absorbing material and its preparation method. The specific technical solution involves coating the surface of iron oxide nanoparticles with a SiO2 shell and performing high-temperature reduction heat treatment to transform the iron oxide core into a Fe magnetic core. Simultaneously, Fe single atoms, iron oxide, and Fe nanoparticles are loaded onto the inner wall of the SiO2 shell. This structure utilizes the SiO2 shell to block the continuous conductive network and suppress the skin effect, while the gradient impedance structure optimizes impedance matching to facilitate the entry of electromagnetic waves into the particle interior. The magnetic losses of the Fe magnetic core and the Fe magnetic particles on the inner wall of the SiO2 shell, as well as the dielectric losses of the Fe single atoms, iron oxide, and Fe magnetic nanoparticles, synergistically and efficiently dissipate electromagnetic waves. Furthermore, after reflection from the Fe magnetic core, the electromagnetic wave undergoes continuous reflection within the hollow cavity between the yolk and shell due to the gradient impedance structure, achieving efficient attenuation of electromagnetic wave energy.

The application discloses an ultrastable antibioadhesion coating and a preparation method and application thereof, and belongs to the technical field of functional materials. The coating provided by the application comprises an A component and a B component; the A component comprises nanoparticles, carboxyl silicone oil, a silane coupling agent and a solvent; the B component comprises a base material and a solvent; the nanoparticles comprise at least one of silicon nanoparticles, iron nanoparticles or zinc nanoparticles; and the base material comprises an epoxy resin. The carboxyl silicone oil and the functionalized nanoparticles are combined through cooperation of the A component and the B component and are embedded in the base material, so that the prepared coating can be used for preparing the ultrastable antibioadhesion coating, the stability and durability of the coating are good, and the coating can effectively reduce adhesion of blood components, proteins, bacteria and cells and the like, and the coating and the prepared coating have good application prospects in implantable medical devices.

An object of the present invention is to provide a liquid chemical exhibiting excellent defect inhibitive performance even in a case of being applied to a resist process by EUV exposure. Another object thereof is to provide a method for producing a liquid chemical. The liquid chemical of the present invention includes an organic solvent; Fe nanoparticles containing a Fe atom and having a particle size of 0.5 to 17 nm; and Pb nanoparticles containing a Pb atom and having a particle size of 0.5 to 17 nm, in which a ratio of the number of the Fe nanoparticles contained to the number of the Pb nanoparticles contained is 1.0 to 1.0×104, based on the number of the particles per unit volume of the liquid chemical.

A system (100) for the magnetic nanoparticle-mediated iron enrichment of staple foods with real-time MRI-trackable bioavailability monitoring, the system (100) comprising: a module (1) for the production of magnetic iron nanoparticles, designed to generate iron-containing magnetic nanoparticles suitable for food enrichment; a module (2) for the functionalization and stabilization of the edible surface, functionally connected to the module (1) for the production of magnetic iron nanoparticles and configured to coat and stabilize the magnetic nanoparticles for use in food;a module (3) for conditioning the food matrix and for dosed enrichment, which is functionally connected to the module (2) for functionalizing and stabilizing the edible surface and is designed to introduce the stabilized magnetic nanoparticles in a controlled amount into one or more staple food matrices; a module (4) for magnetic field alignment and penetration control, which is functionally connected to the module (3) for conditioning the food matrix and for dosed enrichment and is configured to guide, distribute and retain the magnetic nanoparticles within the staple food matrix by applying a controlled magnetic field;an MRI-trackable bioavailability monitoring module (5) functionally connected to the food matrix conditioning and dosed enrichment module (3) and configured to acquire magnetic resonance-based tracking data reflecting nanoparticle distribution, release behavior, and iron availability; a feedback-based enrichment control and prediction module (6) functionally connected to the MRI-trackable bioavailability monitoring module (5), the food matrix conditioning and dosed enrichment module (3), and the magnetic field alignment and penetration control module (4), and configured to dynamically adjust enrichment parameters based on monitored distribution and predicted bioavailability;and a module (7) for managing safety, release and traceability, which is functionally connected to the module (1) for the production of magnetic iron nanoparticles, the module (2) for the functionalization and stabilization of the edible surface, the module (5) for monitoring MRI-trackable bioavailability and the module (6) for feedback-based enrichment control and prediction, and is configured to validate food safety, regulate limits for iron release and maintain batch-related traceability data.

The present application belongs to the technical field of petroleum extraction, and specifically relates to a method for in-situ removal of reservoir plugging using microorganisms and in-situ reservoir oil displacement, and an iron-reducing bacterium activator. The method includes the following steps: injecting a microbial mixture into a target reservoir to allow in-situ activation of microorganisms, such that magnetic iron nanoparticles are generated in-situ in the target reservoir to obtain a plugging-removed target reservoir; wherein the microbial mixture includes an iron-reducing bacterium fermentation broth and an iron-reducing bacterium activator; and injecting water into the plugging-removed target reservoir to allow the reservoir oil displacement. In summary, the method removes reservoir plugging caused by secondary precipitation of Fe(OH)3 through an environmental-friendly biological method. Meanwhile, the microorganisms with an iron-reducing activity enable a green and low-cost biological method to produce highly-active magnetic nanoparticles in situ to allow the reservoir oil displacement.

The invention discloses a pH value response type soil heavy metal passivator and a preparation method thereof.The passivator is a carbon nanowire / iron nanoparticle composite material, the carbon nanowire / iron nanoparticle composite material is prepared by coating an iron-based material with polyamide and then conducting solution spinning and microwave carbonization, the composite material is of a one-dimensional nanowire structure, and the surface of the composite material is grafted with acid-base functional groups; the passivator can realize dynamic response along with the change of soil acidity and alkalinity, is adaptive to anionic or cationic heavy metal ions, converts active heavy metals into stable heavy metals through the synergistic effect of adsorption and metal coprecipitation, and is in a dormant state when the heavy metals are in the stable heavy metals. The passivator disclosed by the invention can dynamically respond along with the soil acidity and alkalinity, is adaptive to cationic heavy metals in acidic soil and anionic heavy metals in alkaline soil, solves the problems that a traditional passivator is narrow in soil acidity and alkalinity adaptation range and poor in passivation pertinence, and has an excellent passivation effect on various heavy metals such as mercury and cadmium.

A preparation method of a particle hydrogel includes: mixing a gelatin nanoparticle, a calcium carbonate nanoparticle, an iron oxide nanoparticle, and a sodium alginate solution under alkaline conditions, and adding GDL to produce the particle hydrogel with improved mechanical properties, which is abbreviated as Ca-Alg / MCG. The present disclosure endows the hydrogel system with properties such as catheter injectability, vascular deliverability, and intravascular hardenability. The particle hydrogel can be delivered to fine blood vessels of tumors. The mechanical properties of the particle hydrogel can be gradually enhanced over time, which further improves the embolization efficacy of the particle hydrogel in blood vessels. Magnetic nanoparticles endow the particle hydrogel with magnetothermal responsiveness. Thus, the particle hydrogel can undergo a rapid temperature rise under an alternating magnetic field to further kill tumor cells. The particle hydrogel demonstrates improved embolization efficacy in rabbit renal embolization models and rabbit liver cancer-embolization models.

The invention discloses a sewage treatment method, and belongs to the technical field of water, wastewater, sewage or sludge treatment. According to the invention, halotolerant bacillus, halomonas sphaeromonas and an embedding medium containing a nano synergist are combined to finally form a carrier, and an immobilized strain preparation is obtained. When the compound is applied to a high-salt organic wastewater degradation experiment, COD (Chemical Oxygen Demand) in water quality indexes of a compound group is 51.3 mg / L, ammonia nitrogen is 5.9 mg / L, total nitrogen is 10.6 mg / L, and volatile phenol is 0.23 mg / L, so that the compound group is superior to a salt-tolerant bacillus group using a single strain, a stone spring halomonas group using a single strain, a magnesium synergist group using nano magnesium particles and a zinc synergist group using nano zinc particles. Therefore, after the halotolerant bacillus and the halomonas

The application discloses a method for screening iron nanoparticles with POD-like catalytic activity, which comprises the following steps: firstly, calculating the most stable iron sites of iron nanoparticles with different ligands and the surface combination of the nanoparticles; and then, using the density functional theory, respectively calculating the POD-like enzyme catalytic path and energy of the iron nanoparticles with different ligands, the reduction process path and energy of the surface atoms, and the surface charge analysis after the modification of the ligands, and selecting the ligand most prone to the POD-like catalytic reaction. The method provided by the application can selectively guide the synthesis of the iron nanoparticles according to the requirements of the catalytic reaction.

The invention discloses a magnetic targeting biological material as well as a preparation method and application thereof. The magnetic targeting biological material comprises a spirulina carrier; a GLP-1 receptor stimulant, wherein the GLP-1 receptor stimulant is loaded on the spirulina platensis carrier; the magnetic nanoparticles are fixed on the surface of the spirulina carrier through physical adsorption or surface modification. The magnetic targeting biological material can effectively regulate and control gamma delta T cell metabolism, inhibit glycolysis, promote aerobic respiration and reduce secretion of a proinflammatory factor IFN-gamma, under the action of an external magnetic field, the iron nanoparticles can be directionally migrated to a targeting area, and through magnetic responsiveness of the iron nanoparticles, the magnetic targeting biological material can be used for preparing a targeted magnetic field. Active and efficient enrichment of the magnetic targeting biological material at an inflammation part around a prosthesis can be achieved, the concentration of local medicine can be remarkably improved, the whole body exposure risk is reduced, a non-invasive and remotely controllable medicine delivery mode is provided, and on-demand and fixed-point treatment is achieved.

The present invention relates to a hybrid iron nanoparticle catalyst comprising: i) 1 to 50 wt. % nanoparticles comprising iron and at least one of a metal M selected from the group consisting of alkali metals, alkaline earth metals, transition metals of groups 3 to 7 and 9 to 11 of the Periodic Table of Elements, lanthanides and combinations of M thereof; and ii) 50 to 99 wt. % of an aluminosilicate or silicoaluminophosphate zeolite, based on the total weight of the catalyst, wherein said nanoparticle has a diameter of about 2 to 50 nm. The present invention also relates to a method of preparing the hybrid iron nanoparticle catalyst and a process for the production of light olefins using the hybrid iron nanoparticle catalyst.

This invention relates to the field of composite material preparation technology, specifically to a high-mechanical-performance particulate hydrogel, its preparation method, and its applications. The method involves mixing gelatin nanoparticles, calcium carbonate nanoparticles, iron oxide nanoparticles, and sodium alginate solution under alkaline conditions, followed by the addition of gluconate-δ-lactone to prepare a high-mechanical-performance particulate hydrogel, abbreviated as Ca-Alg / MCG. This hydrogel system possesses properties suitable for catheter injection, vascular delivery, and intravascular hardening. The hydrogel can be delivered to the small blood vessels of tumors, and its mechanical properties gradually increase over time, further enhancing its embolizing effect in blood vessels. Simultaneously, the magnetic nanoparticles endow the hydrogel with magnetothermal responsiveness, allowing it to rapidly heat up under an alternating magnetic field, further killing tumor cells. Excellent embolizing effects have been observed in rabbit kidney embolization models and rabbit liver cancer embolization models.

The invention relates to the technical field of wastewater treatment, and discloses a wastewater heavy metal ion adsorbent and a preparation method thereof. Ferroferric oxide nanoparticles are prepared through a coprecipitation method to serve as an adsorbent core, the adsorbent is endowed with the rapid magnetic separation characteristic, and the solid-liquid separation efficiency can be improved under an external magnetic field; a silicon dioxide coating layer is generated on the surface of the magnetic core in situ, oxygen and moisture erosion can be effectively isolated, and the adsorption capacity is still kept stable after simple cyclic regeneration. Zinc chloride and sodium bicarbonate are combined to construct a micropore-mesopore composite carbon-based structure, so that the specific surface area is increased, and meanwhile, the adsorption rate constant is increased by accelerating mass transfer through a mesopore channel; functional groups such as carboxyl and hydroxyl on the surface of the carbon-based material and heavy metal ions form a complex, and the electrostatic shielding effect of the silicon dioxide layer is combined, so that the adsorbent keeps higher adsorption efficiency in a wider pH range. The waste biomass is used as the raw material, so that the adsorbent has the advantages of high adsorption efficiency, wide pH applicability and green economy.

This invention belongs to the field of biomedical materials technology, and relates to a signal probe that simultaneously possesses CT and MRI imaging capabilities, its preparation method, and its application. The preparation method includes the following steps: dissolving bismuth citrate and iron salt in water, adjusting the pH of the solution to <7, adding polyvinylpyrrolidone, then adding gallic acid, adjusting the pH of the mixed solution to >7, and after the reaction is complete, filtering through a membrane to remove impurities, dialysis, and drying to obtain bismuth-iron nanoparticles; mixing citric acid with the bismuth-iron nanoparticle solution, stirring and reacting to obtain citric acid-treated bismuth-iron nanoparticles; further activating to obtain an activated bismuth-iron nanoparticle solution; adding RGDfk and amino-terminated polyethylene glycol to the activated bismuth-iron nanoparticle solution, stirring and reacting in the dark, dialysis, and drying to obtain a signal probe that simultaneously possesses CT and MRI imaging capabilities. The signal probe prepared by this invention has a small particle size and simultaneously possesses CT and MRI imaging functions.