813results about How to "Reduce direct contact" patented technology

The invention discloses a comprehensive treating system for domestic wastes. Reutilizing comprehensive treatment for mixed wastes is realized by the system according to a comprehensive sorting technology and a combined anaerobic fermentation technology, wherein the advanced sorting techniques, such as, crushing, magnetic separating, sieving, air classifying, and the like, are adopted in the comprehensive sorting technology; reutilized products, such as metal, plastics, organic matters, and the like, are screened out; the screened organic matters are prepared into slurry together with sludge and excrements and are then subjected to the combined anaerobic fermentation; the reutilized products, such as methane, organic fertilizer, and the like, can be produced under the action of anaerobic fermentation; and after the methane is purified, the methane is used for generating power, domestic fuel or vehicle-mounted fuel. According to the technology, the intensified treatment for organic wastes, such as domestic wastes, sludge, excrements, kitchen wastes, and the like, can be realized. The comprehensive treating system is high in mechanical and automated degree. Compared with the prior art, the comprehensive treating system has the advantages of simplification, effectiveness, less labor power, and the like.

The invention relates to a preparation method and application of electrospinning nanofiber. The preparation method is as follows: synthetic and / or natural polymer materials are dissolved in a volatilesolvent under normal temperature and normal pressure, functional substances are added, and nanofibers are obtained by electrospinning; the functional substances comprise, but are not limited to an odor substance, an organic fluorescent compound, a pigment, a temperature sensitive luminescent and color changing material, a cell growth factor, a hemostatic substance, one or a plurality of nutrientsincluding hyaluronic acid, collagen, and the like which promote skin growth. The nanofiber made by electrospinning has the special effects of sterilization, aromatic odor, fluorescent luminescence, multiple colors, temperature sensitive luminescence and color-changing, promoting wound healing, promoting inhibition and interfering with body function, maintaining skin cell vitality and the like. The method can be used in air purification, automotive air purification, fresh air systems, medical, beauty care, and other nanofiber products.

The invention provides a WiFi wireless control-based intelligent spraying robot which comprises a video acquisition device, a mobile equipment terminal, a system control part and a spraying device, wherein the system control part comprises a dolly module, a WiFi module, a single-chip microcomputer module, a driver module and an obstacle avoidance module. The dolly module comprises a quad-driver track, an aluminium alloy body shell and two motors which are connected in parallel and are positioned at left and right sides of a dolly to drive the dolly. According to the WiFi wireless control-based intelligent spraying robot, a touch button of smartphone software is triggered to send a control instruction so as to accurately control the robot to walk along a right route and spray a crop. By the use of the spraying robot for spraying, pesticides are prevented from being directly contacted with human body during the spraying process, harm of pesticides to human is reduced, physical labor of spraying workers is minimized, and work efficiency is raised.

The invention relates to a lithium ion battery composite diaphragm, a preparation method thereof and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The lithium ion battery composite diaphragm comprises a diaphragm matrix, wherein the diaphragm matrix is a polyolefin microporous membrane or a polyolefin microporous membrane whose surface is coated with a ceramic layer; a surface of the diaphragm matrix is coated with a lithium supplementing layer; and the lithium supplementing layer contains lithium powder. According to the lithium ion battery composite diaphragm, the surface of the diaphragm is provided with the lithium supplementing layer, lithium required for forming an SEI (Solid Electrolyte Interface) film is filled up, supplementationis provided for lithium ions consumed by formation of the SEI film on a surface of a negative pole piece, the irreversible capacity of the lithium ion battery is reduced, and the initial efficiency, the cycle performance and the energy density of the lithium ion battery are improved.

The invention discloses a ternary lithium-ion battery cathode material improved by active oxide multiply and a preparation method thereof. The ternary cathode material has the chemical formula as follows: LiNi1-a-bCoaMnbO2*cNb2O5, wherein a, b and c are mole numbers, a is greater than 0 and smaller than or equal to 0.4, b is greater than 0 and smaller than or equal to 0.4, c is greater than 0 and smaller than or equal to 0.05, and Nb2O5 is active oxide. The preparation method comprises the following steps: coating the surface of a precursor or a positive electrode material with a niobium source, mixing lithium into the precursor, and sintering at high temperature or performing heat treatment at low temperature to prepare the ternary lithium-ion battery cathode material of which the surface is doped with metal ions Nb5<+> and is coated with the oxide Nb2O5. The active oxide Nb2O5 can improve the ternary cathode material multiply. The ternary lithium-ion battery cathode material provided by the invention is greatly improved in aspects of cycle performance and rate performance of a battery, and has excellent electrochemical performance under a high-temperature and large-rate cycle condition.

The invention relates to an individuation minimal invasive vertebral pedicle screw entering navigation template and a preparation method of the navigation template. The preparation method of the navigation template includes: reconstituting a three-dimensional model of a target vertebra based on a medical image; conducting the screw entering porous channel virtual analysis design on the three-dimensional model and defining a screw entering porous channel; taking feature points from the three-dimensional model, designing a vertebral pedicle screw entering navigation template prototype and obtaining a navigation template which fully fits for the vertebral body through the Boolean calculation; and manufacturing the navigation template through 3D printing and other processing methods. The individuation minimal invasive vertebral pedicle screw entering navigation template closely fits for the mastoid process and the lamina arcus vertebrae, is high in stability, ensures accurate implanting of the vertebral pedicle screw, avoids direct contact with the spinous process, reduces peeling of the muscle ligament, realizes minimal invasion, is applicable to various situations such as the vertebral distortion and slipping and the rupture of the vertebral pedicle, prevents slipping and distortion during screw entering due to the arrangement of a finger pressing board, and is convenient to operate and low in the requirement for doctors, degreases the operation risk, improves the operation efficiency and reduces the operation cost further.

A method for processing inferior heavy oil. The method comprises the following steps: allowing a heavy oil raw material to react with a contact agent in a reactor, performing a gasification reaction of the obtained catalyst in a gasifier to generate a syngas-containing gas product and to allow the catalyst to become a semi-regenerant; returning the semi-regenerant to the reactor. The method provided by the invention integrates two aspects of deep processing of inferior heavy oil and reasonable utilization of excess carbonaceous residues, adopts inferior heavy oil as a raw material, performs gasification of surplus coke in a gasifier to generate syngas with the proviso of light oil maximum production, makes reasonable use of residues of heavy oil processing, and produces a product with high economic value.

The invention discloses an intelligent disinfection and epidemic prevention robot which comprises a robot body, wherein the robot body comprises a wheel-type moving platform module, a disinfectant storage box module, a disinfection module and a sensing and control system; the wheel type moving platform module is used for position movement; the disinfectant storage box module is used for storing adisinfectant; the disinfection module comprises an ultrasonic wave spraying unit, a sprinkling unit, an air filtering unit and an ultraviolet ray disinfection unit; the ultrasonic wave spraying unit is used for performing dry fog spraying disinfection of the disinfectant; the sprinkling unit is used for performing wet sprinkling disinfection of the disinfectant; the air filtering unit is used forperforming filtration disinfection on environment air; and the ultraviolet ray disinfection unit is used for performing ultraviolet ray disinfection on the environment; and the sensing and control system is used for sensing the environment and sending control instructions. According to the embodiment of the invention, the intelligent disinfection and epidemic prevention robot provides options andcombination of a plurality of disinfection modes by aiming at the characteristics of novel coronaviruses, and can effectively block the spreading of the novel coronaviruses.

The invention provides a medicine eluting balloon catheter. The medicine eluting balloon catheter has the characteristics of simple structure, simple production process, less loss of medicines in a conveying process, and less medicine residue amount on a balloon after interventional operation. The medicine eluting balloon catheter has a simple structure and is also suitable for large-scale production.

The invention provides a two-layer coated modified ternary cathode high-nickel material and a preparation method thereof. The double-layer coated modified ternary cathode high-nickel material has a double-layer coated structure which is composed of a Ni-Co lithium manganate substrate, a manganese oxide layer coating layer and a metal oxide outer layer coating layer. The preparation method comprises coating the ternary cathode material precursor NixCoyMn1-x-y(OH)2 as a precursor with the manganese oxide and the metal oxide. The method not only reduces the residual alkali on the surface of the material, but also stabilizes the Ni4+ generated by the material when fully charged, improves the high temperature storage performance and the safety performance. Further, the coated nano metal oxide at the outer layer effectively prevents the electrolyte from reacting with the material, improves the cycle performance of the material, increases the material capacity retention rate, and reduces thecost.

The invention relates to a preparation method of magnetic composite catalyst Ag / HNTs / Fe3O4, and belongs to the technical field of environmental function material preparation; a simple and effective chemical reduction method is used to prepare a Fe3O4 / Halloysite Nanotubes (HNTs / Fe3O4) magnetic composite material, then a silver nitrate solution and ammonia are mixed into a fresh silver ammonia solution as an oxidizing agent, glucose is used as a reducing agent, Ag nanoparticles are deposited on the magnetic composite material by a silver mirror reaction to prepare the magnetic composite catalyst Ag / HNTs / Fe3O4, and the magnetic composite catalyst Ag / HNTs / Fe3O4 is used for catalytic degradation of p-nitrophenol in a water solution.

The invention relates to a composition for treating a friction pair and a preparation method thereof. The composition consists of the following components in percentage by weight: 36-76 percent of aluminum silicate ore nano-powder, 28-58 percent of hydroxyl magnesium silicate nano-powder, 6-8 percent of boric acid or borate and 1-5 percent of dispersing agent. The composition is added into lubricating oil or lubricating grease by 0.1-5 percent by weight, and is uniformly mixed for use. The composition can be used for effectively clearing friction sediments on the surface of the friction pair and in a wear concave surface, so that the metal surfaces of the friction pair are clean and naked; and a self-repairing protective ceramic layer with high hardness and an ultralow friction coefficient is formed on the surface of the friction pair for repairing the surface friction of the friction pair, so that direct contact between the metal surfaces of the friction pair is effectively reduced, the friction coefficient is lowered, and the service life of the friction pair is prolonged. The composition has the advantages of strong dispersing action, capability of well suspending in the lubricating oil, no precipitation when standing for a long time, no reaction with the lubricating oil, no change of the viscosity of the lubricating oil, and the like.

The invention discloses an automated hot-stamping production line. An unstacking device is arranged on the production line and used for being docked with a heating feeding manipulator in a heating furnace feeding and discharging device after metal plates are separated, transferring the plates onto the heating furnace feeding manipulator and supporting the plates into a heating furnace, a heating furnace discharging manipulator in the heating furnace feeding and discharging device is docked with a press feeding manipulator in a press feeding device after supporting high-temperature plates out of the heating furnace and transfers the high-temperature plates onto a stamping machine to realize forming of the high-temperature plates through stamping, and finally the high-temperature plates are picked out by a press discharging manipulator in a press discharging mechanical device, so that the automated hot-stamping production line is reliable and stable in performance and high in production efficiency.

The invention provides a method for directly growing a carbon nano tube array on a fiber substrate. The method comprises the following steps: (1) pre-treating the fiber substrate; (2) attaching a catalyst precursor on the surface of the substrate obtained in the step 1, wherein the catalyst comprises transitional metal elements such as Fe, Co, Ni, Cu, Au, Pt, Mo or Ag; (3) putting the substrate obtained in the step (2) in a reaction furnace, heating the substrate to a first temperature and maintaining for a preset time, and introducing inert gas to remove organic matters in the catalyst precursor; (4) heating to a second temperature and maintaining for a preset time, continuously introducing inert gas, introducing mixed gas of reductive gas and carbon source gas, maintaining the pressure in the reaction furnace, and growing high-density carbon nano tubes on the surface of the substrate; and (5) after reaction, stopping introduction of the reductive gas and carbon source gas, and continuously introducing inert gas till the temperature is reduced to room temperature.

The invention provides a long-life nano-iron fluoride electrode material and a preparation method thereof. The electrode material is characterized in that the nano-iron fluoride particle is coated with a lithium fluoride nano-layer on the surface, thus reducing direct contact of the electrolyte solution and iron fluoride, and enhancing the cycle life. The preparation method comprises the steps of: putting iron fluoride particles into a soluble lithium salt solution, performing stirring constantly to form a uniformly dispersed slurry; and drying the slurry, then placing the dried slurry in a sealed container, and introducing a fluoride gas to carry out reaction under certain temperature and certain time, thus obtaining the lithium fluoride coated iron fluoride anode material.

The invention discloses an anti-mite antibacterial healthy knitting fabric and a preparation method thereof. Anti-bacterium and bacterium-resistant silver fibers, anti-bacterium and bacterium-resistant polyester fibers, jute fibers and / or cotton fibers and / or regenerated cellulose fibers are adopted as raw materials to be woven into a gray fabric, then preprocessing, dyeing, softening finishing, anti-mite antibacterial finishing and drying shaping are conducted, and the anti-mite antibacterial healthy knitting fabric is obtained. According to the anti-mite antibacterial healthy knitting fabric and the preparation method thereof, independently designed separant and an anti-mite finishing agent are adopted, biological activity of the anti-mite finishing agent and binding firmness of textiles are guaranteed, the relatively durable anti-mite effect is achieved, direct contact between the human body and mites on the fabric can be reduced, sensibility of the skin is protected, and safety of contact with the human body is guaranteed.

The invention provides a magnet-based torsion percussion boring tool.. The magnet-based torsion percussion boring tool mainly consists of an upper joint, a falling-proof nut, a falling-proof baffle plate, a supporting blocking ring, a casing, a worm wheel, hammer body fixing cavities, percussion hammers, splines, bore bit joints, a fixing cavity baffle plate, magnets, a supporting cylinder, a transmission shaft and a falling-proof pull rod, wherein the casing is connected with the bore bit joints through the splines; the casing is in threaded connection with the upper joint. When the magnet-based torsion percussion boring tool works, drilling fluids drive the worm wheel to rotate, the worm wheel transmits kinetic energy to a lower end hammer body fixing cavity through the transmission shaft, the percussion hammers fixed in the cavities continuously hit a corresponding striking bearing block on the casing during rotating, and percussion energy is transmitted to a bore bit for rock breaking through the bore bit joints. The magnets are used in a percussion assembly of the torsion percussion tool disclosed by the invention, and are fixed to the end surfaces of the inner sides of the percussion hammers. When the percussion hammers hit the striking bearing block, under the effect of percussion force, the hammer bodies can move to the inner side of the fixing cavity, and can be reset by repulsion force of the magnets after percussion is completed. According to the magnet-based torsion percussion boring tool disclosed by the invention, high-frequency torsion percussion force for rock breaking can be formed, and the stick-slip vibration of the bore bit is reduced.

The invention discloses a positive electrode composite material of a lithium ion battery. The specific preparation method of the material is as follows: step 1: weighing an appropriate amount of solidelectrolyte and dissolving into an organic solvent, adding an appropriate amount of positive electrode material to the above solution, stirring uniformly in a high-speed dispersion machine, then putting into a vacuum drying oven and drying till the solvent is volatilized completely; and step 2: calcining the obtained solid powder in an atmosphere of an inert gas for a certain time, and cooling with a furnace to obtain the positive electrode material having a core-shell structure. The positive electrode composite material prepared by the invention is provided with the core-shell structure, a positive electrode active material is taken as a core, and the solid electrolyte coated on a surface of the positive electrode active material is a shell layer; with such a core-shell structure, the direct contact between the positive electrode active material and the solid electrolyte can be reduced, and thus the interface problem between a positive electrode and the solid electrolyte is improved;and in addition, the solid electrolyte of the shell layer can further reinforce the ionic conductivity of the material.

The invention discloses a composite cathode material of a sodium-ion battery. The composite cathode material is characterized by comprising a core part and a sheath coating the surface of the core part. The core part is made from a compound shown in the formula (i), that is Na2MnPO4F (i), and doped with amorphous carbon. The sheath is made from a compound shown in the formula (ii), that is Na3V2(PO4)2F3 (ii) and doped with amorphous carbon. The weight ratio of the compound shown in the formula (i) to the compound shown in the formula (ii) to amorphous carbon is (10-95):(3-90):(0.1-20). The provided composite cathode material of a sodium-ion battery is good in structural stability and cycling performance.

The invention provides a novel drug eluting balloon catheter. The novel drug eluting balloon catheter comprises a catheter body, a balloon body (1) and a balloon surface (2) and further comprises a hydrophilic and lipophilic bottom layer (3) and a drug loading coating layer (4). The hydrophilic and lipophilic bottom layer (3) is arranged on the upper surface of the balloon surface (2), the drug loading coating layer (4) is arranged on the upper surface of the hydrophilic and lipophilic bottom layer (3), and the drug loading coating layer (4) is composed of polymer and drug. The novel drug eluting balloon catheter has the advantages of simple structure, simple production process and procedures, low drug loss during delivery and low drug residues on the balloon after interventional operation.

The invention especially discloses a preparation method for a lithium metatitanate-coated nickel-cobalt-lithium aluminate positive electrode material, belonging to the field of positive electrode materials of lithium ion batteries. The preparation method for the lithium metatitanate-coated nickel-cobalt-lithium aluminate positive electrode material is characterized by comprising the following steps: adding titanium dioxide and nickel-cobalt-lithium aluminate powder into a coating device and carrying out sufficient dispersion, adsorption and recombination so as to obtain solid powder; and putting the solid powder into a muffle furnace, carrying out heating, roasting the solid powder in an air atmosphere and then carrying out natural cooling to room temperature so as to obtain lithium metatitanate-coated nickel-cobalt-lithium aluminate. According to the invention, lithium metatitanate is used for surface coating and used as a conductor material for Li<+>, so intercalation and deintercalation of Li<+> can be better realized, and the cycle performance and rate performance of the material are improved; and through coating with lithium metatitanate, humidity sensitivity of NCA is reduced, direct contact between the electrode material and an organic electrolyte is decreased, so the structural stability of NCA is further improved and security of the material is enhanced.

The invention discloses a storage battery production device. The storage battery production device comprises a packaging machine, a grooving machine, a shearing, brushing and pinching device, a cast welding machine and a connecting machine, wherein the packaging machine comprises a bottom plate; a pole plate placement device and a pole group outlet are arranged on the bottom plate; a suction plate device is arranged on the pole plate placement device; a pole plate transportation device is arranged above the pole group outlet; a blanket folding guide device is arranged on the rear side of the pole group outlet; a grooving machine bottom plate comprises a clamp positioning device; a clamp reshaping device is arranged above the clamp positioning device; a storage battery shell transportation device is arranged right below the clamp positioning device; the shearing, brushing and pinching device comprises a shearing machine, a brushing machine and a pinching machine; the cast welding machine comprises a lead melting device and a cast welding device; a traveling crane is arranged between the lead melting device and the cast welding device; and the connecting machine comprises a storage battery positioning device, a storage battery vertical movement device and a storage battery welding device.

The invention discloses a rapid generating method for an ancient site virtual scene based on a virtual reality technology. The rapid generating method comprises the following steps: 1) acquiring images relating to an ancient site and preprocessing the images; 2) performing ancient site modeling according to the images relating to the ancient site; 3) exporting the ancient site model in a *.3DS format, and saving the ancient site model and texture of the ancient site model in a pre-created folder; 4) adopting Visual Studio software, and using a VC++ platform configured with OpenGL (Open Graphics Library) to read and redraw the *.3DS format file, constructing the 3D (Three-Dimensional) ancient site scene, and adding illumination and the texture; 5) setting up the file path, invoking the constructed 3D ancient site scene as a roaming scene, and implementing roaming in the 3D ancient site virtual scene. The rapid generating method of the ancient site virtual scene can effectively implement construction of the ancient site virtual scene and complete roaming in the ancient site virtual scene.

The invention relates to the technical field of composite materials, in particular to a self-lubricating composite material and a preparation method and application thereof. The self-lubricating composite material is prepared from the following raw materials: a two-dimensional layered nano material, epoxy resin and a curing agent, wherein each sheet layer of the two-dimensional layered nano material consists of a plurality of layers of MXene units; the mass ratio of the two-dimensional layered nano material to the epoxy resin is (0.1-40):(60-99.9); and the mass of the curing agent is 10-15% ofthe mass of the epoxy resin. The two-dimensional layered nano material with a graphene-like structure is added into the epoxy resin matrix, so that the self-lubricating composite material with excellent tribological properties under boundary and mixed lubrication conditions is obtained.

The invention discloses a nickle-cobalt-aluminium anode material used for a lithium ion battery with a long cycle life and a high specific capacity and a preparation method thereof. The chemical formula of the anode material is Li1.05Ni1-x-yyCoxAlyMgzO2.wAl2O3, where x, y, z, w are mole numbers, x is more than or equal to 0 and less than or equal to 0.2, y is more than or equal to 0 and less thanor equal to 0.1, x+y is more than or equal to 0 and less than or equal to 0.2, z is more than 0 and less than or equal to 0.02, w is more than 0 and less than or equal to 0.02, Mg is a doped element,and Al2O3 is a cladding layer oxide of the nickle-cobalt-aluminium anode material with long cycle life and high specific capacity. According to the invention, on the premise of keep a relatively highspecific discharge capacity, the cycle performance of the lithium ion battery nickle-cobalt-aluminium anode material can be greatly improved, and excellent electrochemical performance can be presented. Cheap metal materials such as Mg and Al are introduced in the preparation process of the nickle-cobalt-aluminium anode material, the cost is low, the preparation process is simple, and the problem of short cycle life of the nickle-cobalt-aluminium anode material can be improved to a great extent.

The invention discloses a coated ternary positive electrode material and a preparation method and application thereof. The coated ternary positive electrode material comprises a ternary positive electrode material and a lithium-and-tantalum-containing coating layer coated on the surface of the ternary positive electrode material. According to the preparation method, a tantalum compound is used asa coating raw material to coat a ternary material containing residual alkali on the surface, the residual alkali reacts with the tantalum compound to form the lithium-and-tantalum-containing coating layer on the surface of the ternary positive electrode material, so that the coated ternary positive electrode material is obtained, and the residual alkali comprises Li2CO3 and / or LiOH. By adopting the preparation method disclosed by the invention, the electrochemical properties such as rate capability and cycle performance of the material can be improved while the solubility of residual alkali and the material is reduced.

The invention discloses a microorganism-embedded carrier with composite nanostructure and a preparation method thereof. The microorganism carrier is hydrogel in which active microorganisms are embedded and which is prepared by polymerization reaction and has a composite nanostructure. The preparation method mainly comprises the following steps of: 1, fully dispersing clay particles in water; 2, adding amide monomer into the mixture and fully stirring the mixture; 3, adding a microorganism preparation and a free radical polymerization initiator into the mixture and uniformly stirring the mixture; and 4, performing the free radical polymerization in a sealed container at the normal temperature and the normal pressure to obtain the hydrogel, namely the nano composite microorganism-embedded carrier. The compression ratio of the nano composite microorganism carrier of the embodiment of the invention can reach 97 percent. The method preparing the microorganism-embedded carrier has the advantages of simple, convenient and practical process, and stable quality and superior mechanical property of the prepared carrier.

The invention relates to the field of polishing processing and in particular relates to gear polishing equipment. The gear polishing equipment comprises a rack, a main polishing mechanism, a supporting mechanism and a secondary polishing mechanism, wherein a sliding groove is formed in the bottom of the rack; the main polishing mechanism comprises a motor case, a motor and a ball screw pair; the ball screw pair comprises a rotary rod, a ball nut, a gear and a toothed rod; a main polishing wheel sleeves the toothed rod; the supporting mechanism comprises a supporting seat and a supporting rod;channels are formed in the supporting seat and the supporting rod; airbags are mounted in the channels; a through hole is formed in the supporting rod; a wedged block is mounted in the through hole; the secondary polishing mechanism comprises a base and a connection rod; the connection rod is provided with a secondary polishing wheel; polishing discs are mounted at two sides of the secondary polishing wheel; an electromagnet is arranged at one side of each polishing disc; the electromagnets are fixed on the rack through fixed rods; the supporting seat and the motor case slide in the sliding groove. According to the gear polishing equipment provided by the invention, when a gear is polished, planes at two sides of the gear can be polished, and a toothed surface of the gear also can be polished at the same time.

The invention relates to a method for preparing a superparamagnetic nanoparticle photocatalyst with a Fe3O4-PAMAM-TiO2 core-shell structure by using polyamide-amine (PAMAM) dendrimer as a template and an isolation layer in a low-temperature aqueous solution. The method is characterized by comprising the following steps: firstly, with the PAMAM dendrimer as the template, preparing a superparamagnetic Fe3O4-PAMAM nanoparticle colloidal solution by using a co-precipitation method; then adding the PAMAM dendrimer with different terminal groups and coating Fe3O4-PAMAM nanoparticles so as to form a dendrimer isolation layer; finally, dropwise adding a TiCl4 absolute ethanol solution, and carrying out normal pressure reaction and hydrothermal reaction so as to obtain the nanoparticles with the Fe3O4-PAMAM-TiO2 core-shell structure and a complete TiO2 shell layer; and carrying out washing and redispersion so as to obtain the nanoparticle photocatalyst with the Fe3O4-PAMAM-TiO2 core-shell structure.