60 results about "Material Pore Size" patented technology

The invention relates to an SAPO-34/ZSM-5 composite molecular sieve and a synthesis method of the composite molecular sieve, solving the problems of single pore diameter, low acidity and low reaction activity of the porous materials which are synthesized by the prior art. The synthesis method of the composite molecular sieve comprises the following steps: firstly mixing a silicon source, an aluminum source, a phosphorus source and an organic template agent according to a certain ratio, then adding a certain quantity of ZSM-5 molecular sieves, uniformly mixing and carrying out hydrothermal crystallization, and synthesizing the SAPO-34/ZSM-5 composite molecular sieve by controlling nucleation and crystal growth conditions, wherein the composite molecular size is adjustable in ratio of two phases; an XRD diffraction spectrum of the composite molecular size has a maximum d interval at the positions of 7.92+/-0.1, 8.79+/-0.1, 9.52+/-0.1, 12.85+/-0.1, 16.00+/-0.1, 20.56+/-0.1, 23.01+/-0.05, 23.24+/-0.05, 23.86+/-0.05, 25.83+/-0.1, 30.55+/-0.1 and 31.32+/-0.1. The composite molecular sieve can be applied to industrial production for preparing aromatic hydrocarbon by reacting methyl alcohol/dimethyl ether.

The invention relates to a mordenite/beta zeolite/MCM-22 triphase coexisting molecular sieve and a method for synthesizing the same, and mainly solves the problems that a porous material synthesized by the prior art is single in pore-size, weak in acid and low in activity. The method prepares the porous coexisting material by adding a seed crystal containing an MCM-22 precursor and well controlling the nucleating and growing process of a molecular sieve during a synthesis process of triphase coexisting molecular sieve. The coexistence phase ratio of the triphase coexisting molecular sieve is adjustable, and a mole relation of the components of the synthesized triphase coexisting molecular sieve is nSiO2 :Al2O3, wherein n is between 4 and 400; the triphase coexisting molecular sieve has more than three phases; the XRD diffraction pattern of the triphase coexisting molecular sieve comprises a technical proposal that a maximum value of a distance d is at positions between 13.58-0.1 and 13.58+0.1 A, 12.35-0.1 and 12.35+0.1 A, 11.32-0.1 and 11.32+0.1 A, 11.08-0.1 and 11.08+0.1 A, 8.83-0.05 and 8.83+0.05 A, 8.96-0.05 and 8.96+0.05 A, 6.71-0.1 and 6.71+0.1 A, 6.17-0.1 and 6.17+0.1 A, 4.51-0.1 and 4.51+0.1 A, 4.15-0.05 and 4.15+0.05 A, 3.90-0.05 and 3.90+0.05 A, 3.42-0.05 and 3.42+0.05 A, 3.29-0.04 and 3.29+0.04 A, 3.19-0.04 and 3.19+0.04 A, and 3.02-0.1 and 3.02+0.1 A; therefore, the problems are solved well. The triphase coexisting molecular sieve can be used in the industrial production of ethylene and propylene through the catalytic pyrolysis of naphtha.

The invention relates to a coexisting molecular sieve and a synthesis method thereof, and mainly solves the problems that a porous material synthesized by the prior art is single in pore-size, weak in acid and low in activity. The method prepares the coexisting molecular sieve by adding a seed crystal containing a laminated structure precursor and well controlling the nucleating and growing process of a molecular sieve during a synthesis process of mordenite. The coexistence phase ratio of the coexisting molecular sieve is adjustable, and a mole relation of the components of the synthesized coexisting molecular sieve is nSiO2 :Al2O3, wherein n is between 4 and 400; the coexisting molecular sieve has more than two phases, the XRD diffraction pattern of the coexisting molecular sieve comprises a technical proposal that a maximum value of a distance d is at positions between 13.52-0.1 and 13.52+0.1 A, 12.35-0.1 and 12.35+0.1 A, 11.08-0.1 and 11.08+0.1 A, 8.96-0.05 and 8.96+0.05 A, 8.83-0.05 and 8.83+0.05 A, 6.71-0.1 and 6.71+0.1 A, 6.71-0.1and6.71+0.1 A,4.51-0.1 and 4.51+0.1 A, and 3.29-0.02 and 3.29+0.02 A; therefore, the problems are solved well. The coexisting molecular sieve can be used in the industrial production of ethylene and propylene through the catalytic pyrolysis of naphtha.

The invention relates to a beta zeolite /Magadiite/mordenite coexisting material and a method for synthesizing the same, and mainly solves the problems that a porous material synthesized by the prior art is single and nonadjustable in pore-size distribution. The method prepares the beta zeolite /Magadiite/mordenite coexisting material. A mole relation of the components of the synthesized beta zeolite /Magadiite/mordenite coexisting material is nSiO2 :Al2O3, wherein n is between 10 and 1,000; the beta zeolite /Magadiite/mordenite coexisting material has two coexisting phases; the XRD diffraction pattern of the beta zeolite /Magadiite/mordenite coexisting material comprises a technical proposal that a maximum value of a distance d is at positions between 15.73-0.1 and 15.73+0.1 A, 13.52-0.1 and 13.52+0.1 A, 11.32-0.1 and 11.32+0.1 A, 11.14-0.05 and 11.14+0.05 A, 9.96-0.1 and 9.96+0.1 A, 8.96-0.1 and 8.96+0.1 A, 7.74-0.1 and 7.74+0.1 A, 6.71-0.1 and 6.71+0.1 A, 5.14-0.1 and 5.14+0.1 A, 4.51-0.1 and 4.51+0.1 A, 4.14-0.05 and 4.14+0.05 A, 3.96-0.05 and 3.96+0.05 A, 3.86-0.04 and 3.86+0.04 A, 3.65-0.05 and 3.65+0.05 A, 3.47-0.1 and 3.47+0.1 A, 3.30-0.05 and 3.30+0.05 A, 3.14-0.1 and 3.14+0.1, and 3.02-0.05 and 3.02+0.05 A; therefore, the problems are solved well. The beta zeolite /Magadiite/mordenite coexisting material can be used in the industrial production of ethylene and propylene through the catalytic pyrolysis of naphtha and ethylene and propylene through the dehydration of methanol.

The invention relates to a ZSM-5/Magadiite/mordenite coexisting material and a method for synthesizing the same, and mainly solves the problems that a porous material synthesized by the prior art is single and nonadjustable in pore-size distribution. The method prepares the ZSM-5/Magadiite/ mordenite coexisting material. A mole relation of the components of the synthesized ZSM-5/Magadiite/ mordenite coexisting material is nSiO2 :Al2O3, wherein n is between 10 and 2,000; the ZSM-5/Magadiite/ mordenite coexisting material has three coexisting phases; the XRD diffraction pattern of the ZSM-5/Magadiite/mordenite coexisting material comprises a technical proposal that a maximum value of a distance d is at positions between 15.73-0.1 and 15.73+0.1 A, 13.52-0.1 and 13.52+0.1 A, 11.22-0.2 and 11.22+0.2 A, 9.96-0.1 and 9.96+0.1 A, 8.96-0.1 and 8.96+0.1 A, 7.73-0.1 and 7.73+0.1 A, 6.71-0.1 and 6.71+0.1 A, 5.99-0.1 and 5.99+0.1 A, 5.14-0.1 and 5.14+0.1 A, 4.51-0.1 and 4.51+0.1 A, 3.98-0.05 and 3.98+0.05 A, 3.86-0.05 and 3.86+0.05 A, 3.66-0.1 and 3.66+0.1 A, 3.47-0.05 and 3.47+0.05 A, 3.30-0.05 and 3.30+0.05 A, 3.14-0.1 and 3.14+0.1, and 2.99-0.05 and 2.99+0.05 A; therefore, the problems are solved well. The ZSM-5/Magadiite/mordenite coexisting material can be used in the industrial production of ethylene and propylene through the catalytic pyrolysis of naphtha and ethylene and propylene through the dehydration of methanol.

A process for increasing the energy conversion and electrochemical efficiency of a scaffold material using a deposition material comprises flowing by at least one surface of the scaffold material a solution which comprises the deposition material, forming agglomerations of the deposition material with at least one surface of the scaffold material, wherein the deposition material fills pores on the at least one surface of the scaffold material (“scaffold pores”) thereby increasing the surface area of the scaffold material, electrically connecting deposition material to the scaffold material via the formation of agglomerations, wherein said scaffold material is conductive and flow-through and wherein deposition material has a pore size (“deposition material pore size”) which is no larger than the scaffold pore size.

The present invention relates to a composite-structure molecular sieve and a synthetic method thereof, and mainly solves the problems of single pore diameter, weak acidity and not-high activity of synthetic porous materials in the prior art. The problems can be well solved by the composite-structure molecular sieve, the composition of the composite-structure molecular sieve ZSM-5 / ZnVPI-8 is as follows: the molar ratio of n (ZnO): n (SiO2): n (Al2O3) is 1-100: 10-1000: 1, n represents the number of moles, and an XRD diffraction pattern has diffraction peaks at the position of 6.64 +/-0.1 angstroms,9.83 +/-0.07 angstroms,20.21 +/-0.1 angstroms, 21.14 +/-0.1 angstroms, 22.07 +/-0.1 angstroms, 23.22 +/-0.1 angstroms, 25.06 +/-0.01 angstroms, 26.64 +/-0.1 angstroms, 28.37 +/-0.1 angstroms, 7.96 +/-0.05 angstroms, 8.83 +/-0.05 angstroms, 13 diffraction occurs .23 +/-0.05 angstroms, 15.91 +/-0.01 angstroms, 25.91 +/-0.04 angstroms, 26.96 +/-0.02 angstroms, 45.05 +/-0.01 angstroms and 45.52 +/-0.01 angstroms. The composite-structure molecular sieve can be applied to industrial production of methanol downstream products.

The invention discloses a controllable-through-hole montmorillonite porous material adsorbent and a preparation method thereof. First, a pore-forming agent is well mixed into an MMT (montmorillonite) nano material, such that a mixture is obtained; polyvinyl alcohol PVA colloid is added into the mixture for granulation; drying is carried out; the obtained granules are ground and sieved, such that particles are obtained; the particles are aged; the aged powder is subjected to dry-press molding, such that an MMT blank is obtained; calcination is carried out, wherein heating rate and calcination temperature are controlled; after a temperature-maintaining process, the material is cooled with the furnace, such that the montmorillonite porous material adsorbent is obtained. The adopted pore-forming agent is a mixture of one or more selected from polymethylmethacrylate, starch, waste papermaking fiber, waste textile fiber and waste leather fiber. The pore-forming agent is decomposed into gas penetrating the blank under high temperature, such that through holes are formed, and a water permeation function is realized. With the control over pore-forming agent diameter, pore-forming agent mass percentage and calcination heating rate, material pore size and porosity are controllable. The preparation process is simple; cost is low; and no secondary pollution is caused.

The invention discloses a novel method for controlling aperture and hole pitch of mesoporous materials, and belongs to the technical field of methods for preparing massive mesoporous materials. In the method, gelation time length in the process of synthesizing the massive mesoporous materials is adjusted for controlling the aperture and the hole pitch of the synthesized materials. The method comprises the following steps: preparing tetraethoxysilane, hexadecyl trimethyl ammonium bromide, absolute ethyl alcohol, deionized water and 37.5 percent concentrated hydrochloric acid in a molar ratio of 0.9-1.1: 0.09-0.11: 9.1-10.8: 6-6.5: 0.0015-0.0019 into sol-gel precursors; and dispersing the precursors on a silicon substrate and placing in different environments. The volatilization velocity is adjusted through environmental differences to further change gelation time. The method has the advantages of simple and fast operation, low cost without impurity, and no adverse effect on the mesoporous order degree of the materials.

The invention relates to the technical field of foam materials, in particular to a PHBV microcellular foam material and a preparation method thereof. The PHBV microcellular foam material is prepared from a PHBV composition through a foaming process, wherein the weight percentage of PHBV used in the PHBV composition is 90-100%, the weight-average molecular weight of the used PHBV is 30000-350000, and the molar content of hydroxyvalerate is 1-20 mol%. A two-step foaming method is adopted in the invention. The prepared foam material is small in pore diameter and large in pore density, and a foundation is provided for application of PHBV.

The invention discloses a method for measuring pore size distribution of a rock material. The method comprises the following steps: acquiring a capillary pressure-water inlet cumulative saturation curve by adopting a centrifugal dehydration test; then, through curve fitting with nuclear magnetic resonance T2 spectrum inversion, obtaining optimal conversion coefficient, and finally, obtaining aperture distribution. Compared with the existing method, the method disclosed by the invention has the advantages that the operation is simple and convenient, the measurable aperture range is large, the measurement precision is high, the sample is not damaged, and the repeated measurement can be realized.

The invention relates to a ZSM-5/ZSM-23/Y zeolite triphase coexisting molecular sieve and a method for synthesizing the same, and mainly solves the problems that a porous material synthesized by the prior art is single in pore-size, weak in acid and low in activity. The method prepares the ZSM-5/ZSM-23/Y zeolite triphase coexisting molecular sieve by adding a seed crystal containing a Y zeolite precursor during a synthesis process of triphase coexisting molecular sieve, and well controlling the nucleating and growing process of a molecular sieve during a synthesis process of triphase coexisting molecular sieve. The coexistence phase ratio of the ZSM-5/ZSM-23/Y zeolite triphase coexisting molecular sieve is adjustable, and a mole relation of the components of the synthesized triphase coexisting molecular sieve is nSiO2 :Al2O3, wherein n is between 10 and 1,000; the triphase coexisting molecular sieve has more than three phases; the XRD diffraction pattern of the triphase coexisting molecular sieve comprises a technical proposal that a maximum value of a distance d is at positions between 14.52-0.1 and 14.52+0.1 A, 11.22-0.1 and 11.22+0.1 A, 10.1-0.05 and 10.1+0.1 A, 9.97-0.05 and 9.97+0.05 A, 7.87-0.2 and 7.87+0.2 A, 5.98-0.1 and 5.98+0.1 A, 5.71-0.1 and 5.71+0.1 A, 5.59-0.1 and 5.59+0.1 A, 4.53-0.1 and 4.53+0.1 A, 3.90-0.1 and 3.90+0.1 A, 3.71-0.05 and 3.71+0.05 A, 3.43-0.05 and 3.43 +0.05 A, 2.99-0.05 and 2.99+0.05A, 2.86-0.05 and 2.86+0.05 A, and 2.53-0.1 and 2.53+0.1 A; therefore, the problems are solved well. The triphase coexisting molecular sieve can be used in the industrial production of ethylene and propylene through the catalytic pyrolysis of naphtha.

The present invention discloses a high uniformity glass fiber liquid filtration material and a preparation method thereof, wherein the raw material components of the high uniformity glass fiber liquid filtration material comprise, by mass, 40-95 parts of flame blowing micro-fiber glass cotton, 1-30 parts of centrifugal rotation micro-fiber glass cotton, 1-20 parts of glass fiber short chopped fibers, and 3-10 parts of a water-soluble acrylic acid binder. According to the present invention, the flame blowing micro-fiber glass cotton, the centrifugal rotation micro-fiber glass cotton and the glass fiber short chopped fibers are matched as the raw material so as to make the diameter of the micro-fibers in the raw material stable, and the dispersed slurry is uniform, such that the molding uniformity of the filtration material is improved, the filtration material pore size distribution is uniform and centralized, the production process ability control Cpk is more than 1.67, the production cost is saved, the requirements of the small size engine on the high uniformity of the filtration material performance are adapted, and the service life of the filter is improved.

The invention relates to a ZSM-5/beta zeolite/MCM-49 triphase coexisting molecular sieve and a method for synthesizing the same, and mainly solves the problems that a porous material synthesized by the prior art is single in pore-size, weak in acid and low in activity. The method prepares the ZSM-5/beta zeolite/MCM-49 triphase coexisting molecular sieve by adding a seed crystal containing an MCM-49 precursor during a synthesis process of diphase coexisting molecular sieve. A mole relation of the components of the synthesized triphase coexisting molecular sieve is nSiO2 :Al2O3, wherein n is between 10 and 1,000; the triphase coexisting molecular sieve has more than three phases; the XRD diffraction pattern of the triphase coexisting molecular sieve comprises a technical proposal that a maximum value of a distance d is at positions between 12.26-0.1 and 12.26+0.1 A, 11.32-0.04 and 11.32+0.04 A, 11.22-0.04 and 11.22+0.04 A, 11.08-0.05 and 11.08+0.05 A, 9.97-0.1 and 9.97+0.1 A, 8.82-0.1 and 8.82+0.1 A, 7.74-0.1 and 7.74+0.1 A,6.14-0.1 and 6.14+0.1 A, 5.14-0.1 and 5.14+0.1 A, 4.15-0.1 and 4.15+0.1 A, 3.90-0.05 and 3.90+0.05 A,3.71-0.1 and 3.71+0.1 A,3.45-0.05 and 3.45+0.05,3.29-0.04 and 3.29+0.04 A ,3.20-0.04 and 3.29+0.04 A ,3.08-0.04 and 3.08+0.04 A, and 2.98-0.05 and 2.98+0.05 A; therefore, the problems are solved well. The triphase coexisting molecular sieve can be used in the industrial production of ethylene and propylene through the catalytic pyrolysis of naphtha.

The present invention provides a culture device for tissue cell, and the culture device for tissue cell includes a tissue cell culture body. The porous material of the tissue cell culture body is composed by pore cavities which are classified according to the material pore size and cavity walls which are formed around the pore cavity at all levels. And the lower level small pore cavities are provided on the cavity wall formed around the upper level large pore cavities. The pore cavities within the same level are in communication with each other. And the pore cavities at all levels are also be in communication with each other. This device is particularly benefit for cell culture, so that tissue cells can freely and normally grow in three-dimensional space.

The invention provides a method for improving the measurement accuracy of pore structure parameters. The method is suitable for the field of measurement of pore diameter and specific surface area parameters of nano porous materials. The method specifically comprises the following steps: testing an adsorption-desorption curve of a to-be-tested material sample by using a specific surface area and pore size analyzer; obtaining pore size range data of the to-be-tested material according to the test data; selecting a specific numerical value in the pore diameter range of the to-be-detected materialby utilizing a giant regular ensemble (GCMC) molecular simulation system, building a simulation calculation structure model, and continuously increasing or decreasing the chemical potential of a mainfluid to obtain an adsorption hysteresis loop consisting of a stable state and a metastable state of the fluid in a nanopore; and selecting a particle system with an intermediate state at a given adsorption pressure position in the adsorption hysteresis loop. Analog computation involved in the method can be embedded into analysis software of a test instrument, the operation is simple, and the accuracy of detection results of the pore diameter and the specific surface area of the nano-porous material can be effectively improved.

The invention discloses a three-dimensional porous graphene aerogel wave-absorbing material and a preparation method thereof. The method comprises the following steps: respectively measuring a graphene oxide aqueous solution, a reducing agent and an anti-freezing agent, and obtaining a mixed solution after magnetic stirring and ultrasonic dispersion; transferring the mixed solution into a glass bottle, sealing and placing the glass bottle in a drying oven for pre-reduction to obtain pre-reduced graphene hydrogel; freezing the pre-reduced graphene hydrogel, and then unfreezing the pre-reduced graphene hydrogel at room temperature to obtain freeze-thawed pre-reduced graphene hydrogel; sealing the frozen and thawed pre-reduced graphene hydrogel and placing in a drying oven for continuous reduction, and obtaining graphene hydrogel; putting the graphene hydrogel into an ethanol/water mixed solution to be aged, performing freeze drying, and obtaining the three-dimensional graphene oxide aerogel. The pore size and the volume of the three-dimensional graphene wave-absorbing material can be freely controlled, and free design of absorption of different electromagnetic waves can be realized by controlling the pore size and the volume of the wave-absorbing material.

The invention relates to a method for preparing a functional multi-particle size monodisperse silicon dioxide spherical material. The method specifically comprises the following steps: (1) preparing seeds, namely preparing monodisperse polymer seeds; (2) swelling, namely mixing silicate ester M1, silicate ester M2 and an emulsifier, uniformly emulsifying, adding the monodisperse polymer seeds after reactions in the step (1), and carrying out swelling; (3) polymerizing, namely putting a polymerization agent into the solution obtained after reactions in the step (2), and heating to carry out polymerization; and (4) cleaning, namely removing the excessive solution after the reactions are completed, and cleaning with a detergent, thereby obtaining the monodisperse silicon dioxide spherical material. By adopting the method, the swellable particle-size monodisperse polymer seeds are adopted as a template, the preparation process is simple, the prepared porous silicon dioxide spherical material is good in morphology and has a monodisperse particle size, and compared with a conventional reported process, a calcining process is reduced, and the prepared monodisperse silicon dioxide spherical material is good in porosity controllability.

Disclosed are a method for adjusting the pore size of a porous metal material and the pore structure of a porous metal material. The method comprises: permeating at least one element into the surface of the pores of the material to generate a permeated layer on the surface of the pores, so that the average pore size of the porous material is reduced to within a certain range, thus obtaining a pore structure of the porous metal material having the pores distributed on the surface of the material and the permeated layer provided on the surface of the pores.

The invention relates to a magadiite-beta zeolite coexisting material and a method for synthesizing the same, and mainly solves the problems that a porous material synthesized by the prior art is single and nonadjustable in pore-size distribution. The method prepares a magadiite-beta zeolite coexisting material by well controlling the nucleating and growing process of a molecular sieve during a synthesis process of beta zeolite molecular sieve material. The coexistence phase ratio of the magadiite-beta zeolite coexisting material is adjustable, and a mole relation of the components of the synthesized magadiite-beta zeolite coexisting material is nSiO2 :Al2O3, wherein n is between 20 and 2,000; the magadiite-beta zeolite coexisting material has two coexistence phases, the XRD diffraction pattern of the magadiite-beta zeolite coexisting material comprises a technical proposal that a maximum value of a distance d is at positions between 15.73-0.1 and 15.73+0.1 A, 11.14-0.1 and 11.14+0.1 A, 9.97-0.1 and 9.97+0.1 A, 7.74-0.1 and 7.74+0.1 A, 5.14-0.1 and 5.14+0.1 A, 3.86-0.05 and 3.86+0.05 A, 3.66-0.05 and 3.66+0.05 A, 3.45-0.05 and 3.45+0.05 A, 3.30-0.05 and 3.30+0.05 A, and 3.14-0.1 and 3.14+0.1 A; therefore, the problems are solved well. The magadiite-beta zeolite coexisting material can be used in the industrial production of ethylene and propylene through the dehydration of methanol.

The invention relates to a method for reducing a three-dimensional structure of a non-woven material through a fiber central axis. The method comprises the following steps: extracting a central axis of a fiber through a same-field multi-layer multi-focal-plane non-woven material microscopic image so as to restore the three-dimensional form and position of the central axis in the non-woven material; collecting and fusing multilayer microscopic images; performing the circular segmentation of the fibers, selection of circle center points, calculation of the depth of the circle center points, extraction of the central axes of the fibers and reduction of the closed three-dimensional surfaces of the fibers; extracting the depth of a source point on the central axis of the fiber and the section radius of the fiber at the source point, and then restoring the three-dimensional coordinates of the fiber axis and the closed surface in a spatial interpolation mode. Compared with other reconstruction methods, the method provided by the invention truly restores the relationship between fiber longitudinal directions, and provides a high-quality three-dimensional model for subsequent research on key parameters such as pore size and distribution, pore inner surface area, pore volume, air fluid resistance and pressure difference of the non-woven material.

The invention provides a device for testing the aperture of a porous material. The device comprises: a lower chamber, wherein an air inlet and a first pressure detection port are formed in the side edge of the lower chamber, a first sample detection port is formed in the top of the lower chamber, an air inlet which is externally connected with an air inlet control device, a first pressure detection port which is externally connected with a first pressure sensor, and the opening of the first sample detection port is upward; and an upper chamber which is mounted and fixed above the lower chamber, wherein a liquid adding opening and a second pressure detection opening are formed in the side surface of the upper chamber. The invention further provides a corresponding testing method which has the beneficial effects that the dry-method detection and the wet-method detection of the porous material are completed on the same equipment in sequence, and only one piece of equipment is needed, so that the cost is saved; in addition, the wet method is carried out after the dry method is finished, and the porous material does not need to move, so that the dry method and the wet method are used for detecting at the same position of the porous material, deviation caused by movement is avoided, and the correctness of a final result is ensured.

The invention relates to a preparation method of a quantum dot/zeolite imidazole metal-organic frameworks (MOFs) composite material, in particular to a preparation method of a composite material which takes a zeolite imidazole metal-organic framework structure as a carrier and in-situ grows quantum dots inside the zeolite imidazole metal-organic framework structure. The method has the advantages that the quantum dots are synthesized in situ in the metal organic framework in an ion exchange mode, the quantum dots grow in the pore diameter of the MOFs material in a limited mode, the uniformity of the synthesized quantum dots is improved, and the stability of the quantum dots in an aqueous solution is also improved through the MOFs shell. The prepared composite material is enhanced in electron conduction, stable in fluorescence property and good in biocompatibility, and can meet the requirements of biological detection and imaging application.