276results about How to "High potential application value" patented technology

The invention provides a preparation method of a microalga-based biochar material for heavy metal ion adsorption. The preparation method comprises the following steps that 1, microalgae and water are added into a hydrothermal reaction kettle to prepare microalga suspension liquid; 2, organic acid is added into the microalga suspension liquid, and after the hydrothermal reaction kettle is sealed, protective gas is introduced into the hydrothermal reaction kettle to replace air in the hydrothermal reaction kettle; 3, the hydrothermal reaction kettle in the step 2 is placed in a drying oven for a carbonation reaction, and the microalga-based biochar material is obtained; 4, activating treatment is performed on the microalga-based biochar material, and the activated microalga-based biochar material is obtained. According to the preparation method, biochar is prepared through hydrothermal carbonization by taking the nitrogen-containing microalgae as the raw material, and then activated modification is performed on the biochar through a KOH activating method and a NH3 activating method separately by taking the biochar as a precursor; the activated microalga-based biochar material obtained through activated modification has micro-mesoporous structures, the large specific surface area and the large pore volume, and the adsorption capacity of porous charcoal is greatly improved.

The invention belongs to the technical field of synthesis and preparation of polymer materials, and discloses a synthetic method of triblock polymer, wherein stepwise polymerization (SGB), atom transfer radical polymerization (ATRP) and click chemistry method are combined at first; and 1, 3-dipolar cycloaddition reaction is performed to polymer with azido terminal group and polyurethane prepolymer with alkynyl terminal group to successfully synthesize triblock polymer containing triazole ring. The synthesis method provided by the invention overcomes the defects in traditional block polymer synthesis that reaction conditions are strict, molecular weight distribution is controlled difficultly, and selectable classes of monomers are less, and has the advantages of high conversion rate, mild reaction conditions, narrow molecular weight distribution and strong controllability. The triblock polymer provided by the invention has potential application in ways of medicine slow release, solubilizers and surfactants.

The invention belongs to the technical field of preparation of super-hydrophobic coatings, and particularly relates to a super-hydrophobic coating with self-cleaning and antibacterial functions and apreparation method thereof. The preparation method comprises the steps of: preparing PVDF solid suspension A by adopting an organic solution of polyvinylidene fluoride and small-molecular-weight alcohol, then adding ZIF nanoparticles into the suspension A, then adding fluoride with low surface energy to obtain a super-hydrophobic coating solution, and painting a substrate with the super-hydrophobic coating solution so as to obtain the super-hydrophobic coating with the self-cleaning and antibacterial functions. The super-hydrophobic coating with the self-cleaning and antibacterial functions isprovided, has the advantages of a simple preparation process, mild reaction conditions and good thermal stability and chemical stability, and is applicable to a plurality of different substrates andlarge-scale production, and not only can a function of surface contaminants self cleaning be achieved through the super-hydrophobic coating, but also bacteria on the surface of the coating can be killed at the same time, so that the formation of biofilm is prevented, and the super-hydrophobic coating has great potential application values in the self-cleaning and antibacterial fields.

The invention relates to a method for preparing micro-fibrillated nanocellulose by use of degummed ramie. The degummed ramie is used as a raw material and is crushed into short fibers by a physical-mechanical method, then the short fibers are soaked with distilled water, and then are prepared into cellulose pulp by a beating machine; the cellulose pulp is ground continuously in a reciprocating manner by an ultra-fine refiner to enable the cellulose to be stressed in a refining manner to obtain suspension liquid; and finally, the nanocellulose and water are separated by a centrifugal washing method, and drying is carried out by a vacuum freezing method to finally obtain the powdery micro-fibrillated nanocellulose. The method is simple, has high efficiency, raw material price is low, no chemical agent needs to be added, the energy consumption is low, pollution is slight, the control is easy, and the prepared micro-fibrillated nanocellulose has high yield, good repeatability and good performances and has important scientific significance and considerable application prospect.

The invention relates to a terahertz-band metamaterial with three resonance absorption peaks, belonging to the technical field of electromagnetic function materials. The terahertz-band metamaterial comprises a substrate and metal resonance units periodically arranged on the surface of the substrate. Each metal resonance unit comprises an electric snap ring resonator, the middle part of the electric snap ring resonator is formed by oppositely connecting two same single metal snap rings, and each metal resonance unit further comprises two single metal snap rings connected with long edges of twosides of the electric snap ring resonator back to back. In each metal resonance unit, the central electric snap ring resonator is a resonator of a symmetric closed structure, and two side snap rings are resonators of asymmetric open structures, thus a three-resonance structure is realized. The terahertz-band metamaterial with the three resonance absorption peaks, provided by the invention, has three very obvious absorption peaks in the terahertz band, and the three absorption peaks are distinguished clearly. The terahertz-band metamaterial with the three resonance absorption peaks, provided by the invention, can be processed by a micro-electronics processing technique with low cost, and has very large potential application value in the field of terahertz-band communication (including switches, modems, filters and the like).

The invention relates to the sensor technology field and especially relates to a flexible self-energy-supply pressure sensor. The sensor comprises a dielectric frictional layer and a hydrogel dielectric layer which are attached with each other. Outer sides of the dielectric frictional layer and the hydrogel dielectric layer are successively provided with an electrode layer and a protection layer.The hydrogel dielectric layer is a mixture of a high-molecular polymer and a conductive liquid. The dielectric frictional layer is made of a friction dielectric polymer material. A convex microstructure is arranged on a contact surface of the dielectric frictional layer and the hydrogel dielectric layer. The flexible pressure sensor can be used to measure pressure on the structure. Compared with atraditional piezoresistive sensor, a piezoelectric sensor and a capacitive sensor, by using the pressure sensor of the invention, an idea of providing power by external pressure on the sensor itselfmakes the obtained sensor have advantages of flexibility, low power consumption, and high sensitivity and the advantage that there is no need to add power during measuring. Flexible pressure providedin the invention has a great potential application value on aspects of a wearable sensor and structural surface pressure measurement.

The invention discloses a method for using biomass waste for preparing a nitrogen-doped carbon nanotube coated metal particle composite material. The method includes the following steps that firstly, the biomass waste and KOH are evenly mixed in deionized water, an obtained heterogeneous mixture is carbonized under the protection of inert gas, and biomass charcoal is obtained; and then, the biomass charcoal, a nitrogenous nonmetallic compound and water-soluble divalent metal salt are evenly mixed in methyl alcohol, the obtained heterogeneous mixture is subjected to pyrolysis under the protection of the inert gas, and therefore a target product is obtained. By the adoption of the method, a two-step pyrolysis technology is adopted for achieving growth of carbon nanotubes, and dispersion of metal nanoparticles and formation of a cooperative acting mechanism are promoted; the stability of the composite material is reinforced through the structure of carbon nanotube coated metal nanoparticles; the surface activity and dispersity of a carbon layer are improved through in-situ decoration of the nitrogen element; and the contact and active site point number is increased through the formation of a rich pore structure and the high specific surface area.

The invention relates to a component prism-based phase diversity wavefront sensor comprising a lens, a component prism, a CCD imaging detector, and a computer system. After a parallel light beam containing wavefront distortion passes through the lens and is focused, the focused light beam is vertically irradiated on a front surface of the component prism; after the light beam passes through the component prism, an incident light beam is split into two beams of lights; and two beams of lights emitted by the component prism are imaged on a CCD photosensitive surface, wherein there is a fixed light path difference between the two beams of lights. According to the invention, the optical structure of the sensor is simple; the CCD imaging detector can simultaneously collect a focal plane light intensity distribution image and a defocused light intensity distribution image, so that the synchronism and the real-time property of the two images can be ensured as well as detection precision of the phase diversity wavefront sensor on dynamic aberration and restorability on an expansion object can be effectively improved; and moreover, the provided phase diversity wavefront sensor has obvious advantages in fields like optical detection, adaptive optics, high resolution imaging and the like.

The invention discloses a g-C3N4 / ZnO / activated carbon functional charcoal adsorption material and a preparation method of the g-C3N4 / ZnO / activated carbon functional charcoal adsorption material. The preparation method comprises the steps that biomass (wood or bamboo), melamine and zinc acetate are used as main raw materials, reactions of carbonization, dipping, activation, high-temperature polycondensation and the like are conducted, and then the g-C3N4 / ZnO / activated carbon functional charcoal adsorption material is prepared. According to the preparation method of the g-C3N4 / ZnO / activated carbon functional charcoal adsorption material, an activated carbon precursor, a g-C3N4 precursor and a ZnO precursor are combined, the zinc acetate is used as an activator of activated carbon, the prepared g-C3N4 / ZnO / activated carbon functional charcoal adsorption material is firm in combination, not prone to loss and long in service life, and in-site photocatalytic regeneration can be conducted.

The invention relates to bismuth tungstate nano-sheets and a preparation method thereof. The bismuth tungstate nano-sheets are approximately square-shaped. A single sheet layer has a thickness of 10-100nm, a length of 1-20mum, and a width of 1-20mum; a plurality of bismuth tungstate nano-sheets are stacked along a same specific direction, such that a multilayer square ordered stack is formed. A specific preparation method comprises the steps that: bismuth salt which is soluble in acid is added into concentrated nitric acid; primary stirring is carried out, and deionized water is added for dissolving and diluting; tungstate is added into ammonia water, and is dissolved by stirring; the two solutions are mixed, and a hydrothermal treatment is further carried out, such that the bismuth tungstate nano-sheets are obtained. The preparation method has the advantages of simple process, wide parameter adjustable range, high repeatability, and low cost. The method has good commercial prospect. The prepared bismuth tungstate nano-sheets have high application values in fields such as pollution treatment, environment protection, novel energy preparation, and the like.

The invention discloses a gadolinium compound with dual functions of a magnetic refrigeration function and a ferroelectric function. The chemical formula of the gadolinium compound is shown as follows: [Gd3(HL)(H2L)(NO3)4].C2H5OH, wherein H4L is N, N, N', N'-tetrahydroxyethyl-ethylene diamine; the EtOH is ethanol; and the gadolinium compound has three Gd atoms with different coordination environments, so that an isosceles triangle structure is formed. The preparation method for the gadolinium compound comprises the following steps of: using hexahydrate gadolinium nitrate as metal salt; using H4L as ligand; using LiOH alkali substance to regulate the pH of the mixed solution to 7; and stirring and baking the mixed solution, and separating out the solid and washing the separated solid to obtain the gadolinium compound. The invention has the advantages that the gadolinium compound has excellent magnetic refrigeration and excellent ferroelectric properties, and so that the gadolinium compound has a giant potential value in low-temperature magnetic refrigeration and solid apparatuses such as a ferroelectric memory and the like.

The invention discloses a preparation method of a porous carbon material based on an ionic heat process. The preparation method comprises the following steps: (1) adding a biological material into ionic liquid to form a mixed solution, wherein the ionic liquid consists of anions and cations, and the cations are one of formulas (I) to (IV); and (2) heating the solution to 140 to 260 DEG C, preserving heat for 10 to 48 hours, cooling and performing aftertreatment to obtain the porous carbon material. According to the preparation method of the porous carbon material based on the ionic heat process, the preparation process is simple, energy consumption is low, any severe conditions are not needed, products are easy to purify, the product structure is easy to adjust, and a great potential application value is achieved.

The invention relates to a red long-afterglow luminescent material and a preparation method thereof. The chemical expression of the red long-afterglow luminescent material is (Ca1-x-y-a-b-delta SrxBay)2Nb2O7:Pra, Rb, wherein 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 than or equal to 0.1, a is less than or equal to 0.03 and more than 0, b is more than or equal to 0 and less than or equal to 0.03, delta is more than or equal to 0 and less than or equal to 0.1, and R expresses a rare earth element and selected from one or more of La, Nd, Sm, Eu, Gd, Yb and Lu. The red long-afterglow luminescent material is synthesized in the air by adopting a high-temperature solid phase method, the red long-afterglow luminescent material has obvious red long-afterglow characteristic after being activated by ultraviolet light or sunlight, an emission peak is positioned on a 614-nanometer position, and the longest afterglow observable time exceeds 30 minutes in a dark place under naked eyes. The preparation method disclosed by the invention is simple and easy to operate and can be used for large-scale production without a reducing atmosphere. The red long-afterglow luminescent material disclosed by the invention has the advantages of stability in physicochemical property, high brightness, good monochromaticity and long afterglow time and belongs to an environment-friendly material; according to the red long-afterglow luminescent material, the matrix elements, namely Ca, Sr, Ba, Nb and O, are all tellurian rich elements, and only a small quantity of rare earth elements are adopted, so that no physical injury and environmental pollution are generated in the production and usage of the material.

The invention relates to a flexible and electrically insulating fluorinated graphene heat-conducting composite film as well as preparation and an application thereof. The composite film comprises fluorinated grapheme nanosheets and polyvinyl alcohol. The preparation comprises the following steps: uniform dispersion of polyvinyl alcohol / fluorinated graphene is treated with a decompression-assistedfiltering film forming method to enable the fluorinated graphene nanosheets to be orderly stacked on a base film. The fluorinated graphene composite film obtained with the method not only has high in-plane thermal conductivity, but also maintains good electrical insulation and bendability, thereby having potential application value in future thermal management of flexible electronic devices. The method is convenient to operate, has relatively simple preparation conditions and low production cost, facilitates batch production and large-scale production, and has good industrial production foundation and broad application prospect.

The invention discloses a preparation method of a spherical gadolinium-doped titanium dioxide photocatalyst. The method comprises: using a sol-gel method to add tetrabutyl titanate into anhydrous ethanol, and adding nitric acid, gadolinium nitrate and distilled water during stirring, stirring them to make ions fully enter the interior or surface of titanium dioxide, then putting the mixture into a constant temperature drying box for drying, then grinding the product into powder, and putting the obtained powder in a muffle furnace for calcination, thus obtaining the rare earth gadolinium-doped nanometer titanium dioxide photocatalyst. The preparation method can load rare earth gadolinium ions on the interiors or surfaces of titanium dioxide nanoparticles successfully, and in a prepared sample, the gadolinium ions have high dispersity in titanium dioxide. The product has stable properties. And the method has the advantages of simple technology and process and the like.

The invention relates to a one-pot method for synthesizing N-substituted phthalimide through carbonylation. The method comprises the following steps: adding aromatic aldehyde, amine, a metal palladium catalyst and a solvent into a reaction container, then adding a copper salt as an oxidizing agent and carrying out stirring for 4 to 24 h at normal temperature; sleeving the reaction container with a balloon filled with carbon monoxide and oxygen and carrying out a stirring reaction at 40 to 150 DEG C for 12 to 72 h; after completion of the reaction, carrying out cooling to room temperature and dismounting the balloon; subjecting a reaction solution to filtering and carrying out pressure reduced evaporation to remove a solvent so as to obtain a crude product; and subjecting the crude product to column chromatographic purification so as to obtain the N-substituted phthalimide. The one-pot method for synthesizing N-substituted phthalimide through carbonylation is simple and safe to operate, uses easily available and cheap raw materials, has good function group applicability and can be used for synthesis of a plurality of drug molecules; and the method has excellent yield, is favorable for industrial production and has important application values in organic synthesis.

The invention relates to a toughening polyethylene-polylactic resin combination which comprises polyethylene, polylactic resin and an impact modifier. The impact modifier comprises a copolymer impact modifier composed of monomers (a), (b) and (c), wherein, the (a) is ethylene and the (b) is a kind or many kinds of alkene with a general formula CH2=CR<1>, wherein, the R<1> is an alkyl which comprises 3 to 9 carbon atoms like propyl, butyl or amyl; the (c) is a type or many types of alkene with a general formula CH2=C(R<2>)CO2R<3>, wherein, R<2> is hydrogen or an alkyl which comprises 1 to 5 carbon atoms like methyl and R<3> is glycidyl. The combination is characterized by favorable impact resistance and tractility, higher rigidity and being environmentally-friendly.

The invention discloses a method for preparing sulfydryl modified ferroferric oxide / silicon dioxide magnetic nanoparticles. The method comprises the following steps that 1, magnetic ferroferric oxide particles are prepared with trivalent ferric salt serving as raw materials through a solvothermal method; 2, tetraethoxysilane is adopted as a silicon source, generated silicon dioxide wraps the surfaces of the magnetic ferroferric oxide particles through a sol-gel method, and ferroferric oxide / silicon dioxide magnetic nanoparticles are formed; 3, the ferroferric oxide / silicon dioxide magnetic nanoparticles are placed in a methylbenzene solution and dispersed evenly to obtain a solution A, dimercaptosuccinate is added to a dimethyl sulfoxide solution and dispersed evenly to obtain a solution B, the solution A and the solution B are mixed and stirred and react for a period of time, then solid-liquid separation, cleaning and drying are carried out, and then the sulfydryl modified ferroferric oxide / silicon dioxide magnetic nanoparticles are obtained. The magnetic nanoparticles are good in dispersing performance, achieve good stability and biocompatibility, and has potential application value in the bio-medical field.

The invention discloses a method for preparing high-purity mono-disperse silicon dioxide hydrosol. The method comprises the following steps: a hydrolysis reaction is performed on monocrystal silicon powder serving as a silicon source by taking ammonia as a catalyst, the reaction is performed in a heating, stirring and ammonia (99.99 percent) atmosphere; the reactive liquid is filtered after the reaction is completed to obtain the high-purity mono-disperse silicon dioxide hydrosol product. In the silicon dioxide hydrosol prepared by adopting the method, the solid content is between 20 and 35 percent, and the sphere particle size distribution is between 25 and 35nm. In the preparation process, high-purity silicon powder is used as a silicon source instead of sodium silicate and other soluble silicate or orthosilicate, ammonia is used as the catalyst instead of alkaline metal, so metal impurities (such as sodium, iron, aluminum and the like) introduction or residual ester and alcohol is effectively avoided, and high purity of the product is ensured. The product has great potential application value in self assembly of photonic crystal, chromatography packing, size reference material, planar display and other fields.

The invention provides a magnetic biochar composite material preparation method based on microalgae. The preparation method at least includes the steps: firstly, adding microalgae and water in a hydrothermal reaction kettle to prepare a microalgae suspension; then successively adding an iron salt, an organic acid and a catalyst in the microalgae suspension, sealing, and then introducing a protective gas to displace air in the reaction kettle; placing in an oven, and carbonizing, to prepare a magnetic biochar composite material having the advantages of stable structure, controllable morphology, stronger magnetism and easy magnetic separation and having the surface rich in carboxyl functional groups. Compared with the prior art, by adding a small amount of the organic acid and the catalyst, the hydrothermal 'one-step method' is carried out to achieve primary biomass green preparation of the Fe3O4 magnetic biochar composite material, and the method is simple to operate, economic, efficient, and friendly to the environment, and has a relatively great potential application value.

The invention discloses a bacillus pumilus strain. The bacillus pumilus strain is preserved in the Guangdong culture collection center on June 5, 2018, is named as bacillus pumilus CFC-5, and has a preservation number of GDMCC NO:60397. The bacillus pumilus CFC-5 strain is able to degrade protein in tung cake, has a broad spectrum inhibition effect for soil-borne diseases of crops, has a growth promoting effect and provides a strain source to tung cake degrading. The invention further discloses application of the strain in degrading protein in tung cake and inhibiting crop diseases.

The invention relates to a non-aluminium zeolite molecular sieve containing a TON / MTT skeleton topology structure and a preparation method of the zeolite molecular sieve. The preparation method comprises the steps of dissolving an inorganic alkaline source by using deionized water, then adding a template agent A, a boron source, an iron source or a gallium source, dissolving completely, then adding a template agent B or a silicon source, and adding an-all silicon ZSM-22 molecular sieve as seed crystal into obtained initial gel and then performing ultrasound; utilizing microwave radiation to heat a mixture subjected to the ultrasound so as to obtain a non-aluminum zeolite molecular sieve with a TON / MTT composite topology structure after crystallization. According to the method, the non-aluminium zeolite molecular sieve replaced with a heteroatom is utilized, the acidity is moderate, and the multilevel acidity distribution is adjustable; by adopting the preparation method provided by the invention, the synthesis time is short, the miscellaneous crystal is less, the particle size is uniform, and the repeatability is good. The composite molecular sieve has a huge potential application value in the aspects such as hydrocracking and isomerization.

The invention relates to a selenium-silicon-silver-barium compound, a selenium-silicon-silver-barium middle and far infrared non-linear optical crystal as well as a preparation method and application thereof. A chemical formula of the compound is BaAg2SiSe4, molecular weight of the compound is 697.01, the crystal is a tetragonal crystal system, a space group is of a non-centrosymmetry type (described in the specification), cell parameters comprise that a=b=7.066(3) angstrom, c=8.233(7) angstrom, alpha=beta=gamma=90 degrees and Z=2, and unit cell volume V=411.1(5) angstrom<3>. The preparation method comprises the step of carrying out solid-phase reaction on simple substances barium, silver, silicon and selenium under vacuum condition. Powder XRD spectra of the selenium-silicon-silver-barium compound and the selenium-silicon-silver-barium middle and far infrared non-linear optical crystal are consistent with theoretical values; and under irradiation of lasers with the wavelength of 2090nm, and frequency doubling effect of BaAg2SiSe4 with the granularity of 55-88 Mum is two times that of AgGaS2 with the same granularity.

The invention discloses a polymer with a bidirectional reversible shape memory effect. The polymer comprises at least one amorphous phase and a crystal phase, wherein the glass-transition temperature of the amorphous phase is higher than the melting temperature of the crystal phase and the difference is at least 20 DEG C. The preparation method of the polymer comprises the step of preparing a single-crystal thermosetting bidirectional reversible shape memory molecule by taking the high-temperature amorphous phase as a stress phase to replace the high-temperature crystal phase in a bi-crystal thermosetting reversible shape memory molecule. The glass-transition temperature of the amorphous phase of the polymer can be continuously controlled through different comonomers; the control of the proportion of the two phases, the crosslinking densities and the transition temperature of the crystal phase can be realized under the premise of ensuring that the glass-transition temperature of the amorphous phase is higher than the transition temperature of the crystal phase. The polymer is light in material weight, easy to process and low in cost, has excellent insulation property and thermal insulation effect and has wide potential application value in the fields of biomedicine, cable industry and packaging industry.

The invention relates to an intelligent measurement robot system based on BIM, which comprises a mobile chassis, a master control device, a leveling device, an intelligent total station, a handheld terminal and 360-degree prisms. The master control device comprises a master control box, a wireless router, a positioning module and an industrial personal computer. The wireless router is connected with the handheld terminal to realize communication and data exchange between the industrial personal computer and the handheld terminal. The positioning module is used for roughly positioning a measurement robot. All instructions of the handheld terminal need to be distributed through the industrial personal computer, and instruction feedback information of all devices is collected and processed bythe industrial personal computer. The leveling device is installed on the master control box, and the intelligent total station is installed at the top end of the leveling device. The 360-degree prisms are arranged on three control points with known coordinates on site. According to the invention, the intelligent total station is used for automatically aiming at the three 360-degree prisms arranged at known positions in advance to carry out intelligent station setting, and then, rapid acquisition and automatic analysis of three-dimensional coordinates of a construction completion surface arerealized through automatic lofting and prism-free measurement.

The invention belongs to the technical field of organic polymer materials, and discloses a diamine monomer with a carbazole structure and polyimide synthesized by the diamine monomer. The diamine monomer with the carbazole structure is prepared by 3,6-dibromo-9-phenyloxazole and 4-aminobenzeneboronic acid hydrochloride through a one-step reaction, the monomer and aromatic dianhydride are subjectedto a ring-opening reaction to obtain polyamide acid, and polyimide is obtained through a heating ring formation method. A method for synthesizing polyimide adopts mild reactions and is easy to operate and provides possibility for industrialization. The prepared polyimide material shows excellent performance, particularly has significantly-improved thermal stability, and has great potential application value and good application prospects in the fields of aerospace, electrical engineering, microelectronics and the like.

The invention relates to a hierarchical porous composite molecular sieve with adjustable acidity distribution. The composition of the molecular sieve in molar ratio is that SiO2:Al2O3 is equal to 4.6-982, the molecular sieve contains TON and MTT framework topological structures, the molar ratio of ZSM-22 to ZSM-23 is (10-90):(90-10), the specific surface area of BET is 253.2-283.7m<2> / g, and each granule is a stick-like substance with the length less than or equal to 1 Mum and the outer diameter of 20-30nm. The composite molecular sieve provided by the invention has the characteristics of hierarchical acidity, hierarchical pores and the like, the TON / MTT proportional distribution is adjustable, and silica-alumina ratio can be adjusted and changed in a wider range.

The invention provides a method for preparing a metal micro-nano array electrode by using a ZnO crystal as a template. The method employs a ZnO crystal array as the template and comprises the steps of submerging the template by photoresist, dissolving ZnO away after the photoresist is stabilized, and electrodepositing the metal crystal in holes formed by dissolving ZnO away. The obtained metal crystal has ZnO morphology, being in hexagonal prism shapes.

The invention relates to an orange long-afterglow luminescent material and a preparation method thereof. The material takes Ca4Nb2O9 as a matrix and takes Pr<3+> as an activating agent, the expression formula of the material is [(Ca(1-x)Mx)(1-z)]4Nb2O9:(Pr(1-y)Ry)z, x is larger than or equal to 0 and smaller than or equal to 0.2, y is larger than or equal to 0 and smaller than or equal to 0.5, z is larger than 0 and smaller than or equal to 0.1, and M represents a Ca-site substitute element and is one or more of Mg, Sr and Ba; R represents a rare earth or transition metal element and is one or more of La, Nd, Sm, Eu, Gd, Yb, Lu, Cr and Mn; x, y and z represent molar content. The material is synthesized in the air with a high-temperature solid phase method. After excitation by ultraviolet light or daily light, the material has a remarkable orange long-afterglow characteristic, and people can watch afterglow for more than 10 minutes with naked eyes in a dark place. The orange long-afterglow luminescent material and the preparation method have the advantages as follows: (1) the preparation method is simple and easy to operate, and the reducing atmosphere is not required; (2) the material has stable physicochemical properties, high brightness and long afterglow time; (3) the matrix elements of the material are all elements rich on the earth, no physical harm or environmental pollution is caused during production and use of the material, and the material belongs to an environment-friendly material.

The invention relates to a preparation method for a metallocene-containing porous polymer material. The method comprises the main steps that with a metallocene compound or a mixture of the metallocenecompound and an aromatic compound as a raw material, under the function of a Lewis acid catalyst, the metallocene-containing porous polymer is prepared through a Friedel-Crafts reaction. The preparedmetallocene-containing porous polymer material is adjustable in pore size, pore volume and specific surface area, an obtained porous network is formed by connecting covalent bonds, and the material has good chemical stability and thermal stability. By introducing metal and heteroatoms to the porous polymer network, the interaction force of a polymer framework and adsorbed molecules can be increased, and the adsorption amount and speed of carbon dioxide, methane, hydrogen, sulfur dioxide, dyes and the like are increased.