354 results about "Photodegradation" patented technology

The invention discloses a preparation method and application of monolithic BiVO4 photocatalytic foamed ceramic. The method comprises the following steps: 1) preparing composite slurry containing BiVO4 powder, an organic additive and a reinforced phase; (2) uniformly attaching the composite slurry to the organic foam skeleton by adopting an impregnation method; 3) performing drying and heat treatment to remove organic components; and 4) performing high-temperature sintering to form the three-dimensional communicated porous structure. Through the structure-function integrated design, the problems that a traditional powder catalyst is difficult to recover, the activity of an immobilized catalyst is low and a supported catalyst is easy to fall off are solved. The obtained product is high in porosity, the compressive strength is larger than or equal to 0.1 MPa, the specific surface area is larger than or equal to 0.1 m < 2 > / g, visible light can be efficiently utilized for degrading emerging organic pollutants in water, and the degradation rate reaches 20-99%. The material has no nano-particle leakage risk, has excellent mechanical strength, chemical stability and engineering applicability, and provides a feasible scheme for large-scale application of a photocatalytic water treatment technology.

The invention relates to a photo-degradable room temperature curing double-component polyurethane adhesive and a preparation method thereof.The adhesive comprises a component A and a component B. The component A comprises a polyol modified polyurethane prepolymer with the end group being an isocyanate group, and the component B comprises a polyhydroxy composition; the component A and / or the component B further comprises a photodegradable oximido unit. After the two components in the adhesive are mixed, sized and cured, the oximido unit can be degraded through ultraviolet irradiation, so that the bonding strength is reduced, and a bonding base material can be naturally debonded along with the prolonging of the irradiation time. In the gluing process, curing can be completed at the room temperature after the two components are mixed, bonding of a heat-sensitive material can be achieved easily, then a bonding sample can be detached through ultraviolet irradiation, and good application prospects are achieved.

The invention discloses a composite film based on light-biological synergistic gradient degradation and a preparation method thereof, the composite film sequentially comprises a light response layer, a transition layer and a biological response layer from outside to inside, and the light response layer comprises a polycaprolactone matrix, a tetraphenylporphyrin iron photosensitizer and anatase type TiO2 nanorods; the transition layer is a gradient blend of polylactic acid and modified starch; the biological response layer comprises polyhydroxyalkanoate and bacterial cellulose nanofibers; through the design of the three-layer gradient structure and the construction of the bionic microchannel, the synergistic effect of light degradation, hydrolysis and biodegradation is realized; the composite membrane has excellent mechanical properties and environmental adaptability, the degradation period can be accurately regulated and controlled within 30-180 days, and the soil degradation rate within 60 days reaches 91% or above; the preparation method comprises the processes of electrostatic spinning, gradient co-extrusion and bacterial cellulose in-situ culture. The material can be widely applied to the fields of agricultural mulching films, food packaging and the like, and the problems that a traditional degradable film is poor in mechanical property and uncontrollable in degradation are solved.

A photosensitizer chimera targeting PD-L1 protein, and a preparation method therefor and a use thereof. The photosensitizer chimera is of an X-R-G structure, wherein X is a photosensitizer unit, R is a linker, G is a polypeptide unit targeting PD-L1 protein, the photosensitizer is a porphyrin photosensitizer, and the excitation light wavelength of the photosensitizer is longer than 550 nm; the molar absorption coefficient at the maximum absorption wavelength longer than the wavelength of 550 nm is greater than 1000 M -1cm-1; the quantum yield of a triplet state exceeds 0.01; the linker is selected from the following structural formulas, wherein the amino side of the linker is connected to the photosensitizer unit, the carboxyl side of the linker is connected to the polypeptide unit, and n is an integer of 0-50; the binding constant of the polypeptide and h-PD-L1 is less than 20 µm. Combination therapy of immune checkpoint blockade and cytotoxicity induced by the photosensitive chimera based on photodegradation of PD-L1 protein in PD-1 / PD-L1 can cause stronger immune response than monotherapy, and thus the photosensitive chimera has great potential in enhancing antitumor therapy.

A method of photodegrading an organic compound may include irradiating, in the presence of the organic compound, a nanocomposite including graphitic C3N4, MnO2, and MgAl2O4 in a mass relationship to each other in a range of from 5 to 15:2 to 7:75 to 95, at a temperature in a range of from 10° C. to 80° C. in a contaminated volume of water, thereby photodegrading the organic compound to partially decompose the organic compound and at least partially decontaminate the contaminated volume of water.

The invention relates to the technical field of recycling of waste textiles, in particular to a method for accelerating degradation of waste polyester, which comprises the following steps: S1, adding crushed polyester materials into organic alcohol, and then adding organic alkali and a photodegradation catalyst to obtain a degradation system; and S2, carrying out a degradation reaction in the degradation system under illumination and heating conditions, and after the reaction is finished, carrying out constant-temperature solid-liquid separation, cooling crystallization, washing and drying to obtain the terephthalic acid glycol ester. The photodegradation catalyst is at least one of nano ZnO and nano TiO2. According to the method disclosed by the invention, low-temperature and rapid degradation can be realized to obtain the terephthalic acid glycol ester, the energy consumption of polyester degradation is effectively reduced, the yield of polyester recovery is improved, and the recycling of polyester fabrics is realized.

To provide a photodegradable polymer that is easily decomposed upon exposure to light or the like.SOLUTION: The present invention provides a photodegradable polymer comprising a photodegradable monomer for polymerization with a group represented by a formula (1) as a radical-degradable moiety (where R1 and R2 independently represent an alkyl group or an aryl group).SELECTED DRAWING: None

The invention provides a VOCs gas purification system and method, and relates to the technical field of waste gas treatment.The system comprises a pre-filter, a modified zeolite rotating wheel, a UV photolysis oxidation unit, a target sensor, an intelligent controller and a draught fan, the pre-filter is used for filtering out particulate matter larger than 0.3 micrometer in gas to be purified; the modified zeolite rotating wheel is used for adsorbing part of VOCs gas in the filtered gas and heating and desorbing the adsorbed part of VOCs gas into the storage tank; the UV photolysis oxidation unit is used for performing photodegradation treatment on residual VOCs gas in the gas subjected to adsorption treatment to obtain purified tail gas; the target sensor is used for monitoring target concentration data of the VOCs gas, and the intelligent controller intelligently controls the air volume of the fan based on the target concentration data. By implementing the technical scheme provided by the invention, the effects of saving energy and reducing energy consumption are achieved.

The invention provides emamectin benzoate-sodium alginate composite microspheres and a preparation method thereof, and belongs to the technical field of pesticide preparations. The composite microspheres disclosed by the invention are prepared from the following raw materials: 0.5 to 1 part of emamectin benzoate, 0.2 to 1 part of a modifier, 0.1 to 0.5 part of isopropyl phenyl triphosphate, 0.5 to 5 parts of sodium bentonite and 1 to 8 parts of sodium alginate. The emamectin benzoate-sodium alginate composite microsphere photolysis-resistant slow-release pesticide is prepared by taking sodium alginate and modified organobentonite as carriers to load active ingredients of emamectin benzoate. The emamectin benzoate-sodium alginate composite microspheres prepared by the invention have the advantages that the drug loading capacity is obviously improved, the drug release time is obviously prolonged, and the slow release effect is better. According to the invention, sodium alginate and organic bentonite are utilized to load emamectin benzoate to form a'date cake model 'structure, so that direct irradiation of ultraviolet rays can be effectively shielded, the light degradation rate of emamectin benzoate is slowed down, and meanwhile, the effective utilization rate of emamectin benzoate is improved.

The present invention discloses a preparation method and application of a photocatalytic anti-pollution separation membrane. In the present invention, lignin is used as a carbon precursor to modify TiO2, and a lignin-TiO2 composite material is prepared by a sol-gel method, and a C-Ti composite material is obtained by pyrolysis; the C-Ti composite material is introduced into a polymer solution by a phase inversion method to prepare a photocatalytic anti-pollution separation membrane. The prepared C-Ti doped membrane can effectively separate lignin and salts in the simulated pulp-making waste liquid, realize the resource utilization of waste lignin and greatly reduce the usage amount of TiO2 while ensuring a similar photocatalytic degradation efficiency for BSA pollutants and better anti-pollution performance.

The present invention relates to a process for enhancing the photocatalytic degradation of perfluorooctanoic acid by a foam-supported nanocatalyst, which comprises the following steps: the first step is the collection and detection of industrial wastewater containing perfluorooctanoic acid; the second step is the pH adjustment of the industrial wastewater; and the third step is the process for photocatalytically degrading perfluorooctanoic acid. By effectively inhibiting the aggregation of the nanocatalyst during the reaction, the present invention can achieve the effective degradation of perfluorooctanoic acid (the degradation rate is 73.2-99.9%) and the recycling and reuse of the nanocatalyst.

The invention provides a bolete concentrated powder composition lipid carrier with an anti-aging effect as well as a preparation method and application of the bolete concentrated powder composition lipid carrier. The lipid carrier is prepared from the following substances in percentage by mass: 10 to 40 percent of bolete extract, 0.2 to 0.8 percent of antioxidant, 45 to 66 percent of solid lipid, 10 to 16 percent of liquid lipid and 4.2 to 7.8 percent of surfactant. According to the bolete concentrated powder composition lipid carrier provided by the invention, liquid lipid with anti-oxidation and light protection effects is mixed into solid lipid to construct a nano carrier matrix with a light protection function. Plant active ingredients with a light protection effect and an anti-oxidation effect and ergothioneine in the bolete extract are jointly loaded in a nano-structure lipid carrier, so that synergistic interaction of multiple effects is realized. The synergistic delivery system of the nanostructured lipid carrier can inhibit the photodegradation reaction of the ergothioneine and the generation of peculiar smell, improve the photostability of the ergothioneine, enhance the oxidation resistance of the ergothioneine in an acid environment, and improve the anti-aging effect.

The invention discloses a foaming sealing strip material and a preparation method thereof, and relates to the technical field of high-molecular compound compositions. The foaming sealing strip material is prepared from the following components in parts by mass: 80-110 parts of ethylene propylene diene monomer, 5-15 parts of a foaming agent, 3-8 parts of an activating agent, 2-6 parts of a cross-linking agent, 30-60 parts of a filling agent, 20-40 parts of a softening agent, 1-3 parts of a foaming aid and 1-4 parts of an anti-aging agent. The anti-aging agent adopted by the invention can effectively capture free radicals generated in a rubber oxidation process, terminate a chain reaction and prevent a rubber main chain from being broken; ultraviolet light energy can be absorbed and converted into heat energy, and light degradation of a rubber molecular chain is reduced, so that the aging resistance of the sealing strip is remarkably enhanced.

The invention discloses a method for promoting photodegradation of coexisting ciprofloxacin and reducing ecological toxicity of the coexisting ciprofloxacin by active oxygen generated by photoaging polystyrene microplastics. The polystyrene micro-plastic PS-MPs is subjected to light irradiation to be aged to a certain degree, and surface physicochemical property changes of the PS micro-plastic PS-MPs are represented through SEM, FTIR and XPS. Especially in the coexistence of aged PS, the degradation rate (67%) of CIP is almost three times of the degradation rate (21%) of CIP in the presence of original PS. Quenching experiments and steady-state concentration experiments prove that the enhancement of CIP photodegradation by aged PS-MPs is related to reactive oxygen species (ROS) generated on the surfaces of the aged PS-MPs, and < 1 > O2 plays a leading role in the photodegradation process of CIP. Bacteria inhibition experiments prove that in the presence of aged PS, the biotoxicity of CIP is weakened. The method also shows a relatively strong application effect in actual water bodies.

A radiation-sensitive composition contains a polymer having an acid-releasable group, and a compound represented by formula (1). In the formula (1), A1 represents a (m+n+2)-valent aromatic ring group. Both —OH and —COO− are bound to a common benzene ring in A1. Atom to which —OH is bound is located next to an atom to which —COO31 is bound. R1 represents a monovalent group comprising a cyclic (thio)acetal structure. m is an integer of ≥0. n is an integer of ≥0. M+ represents a monovalent organic cation.

The invention relates to the technical field of multi-layer material preparation, in particular to a high-light-transmittance weather-proof impact-resistant striped sound insulation board. The problem that transparency, weather resistance and sound insulation effect of a traditional stripe material are difficult to consider at the same time is solved. The light scattering and absorption center is reduced and high transparency and low haze are realized through reactive extrusion of the recycled material, combination of high-temperature adsorption activated carbon, multi-stage high vacuum and deep purification of a reactive decolorizing agent, and matching of transparent dispersion diffusion master batch and a compatilizer. The surface layer adopts the core-shell weather-resistant master batch and the secondary high-energy UV fluorosilicone curing coating for double shielding of ultraviolet and inhibition of photodegradation and yellowing; styrene-maleic anhydride damping resin is introduced into the middle layer, and uniform inclined micropores and asymmetric stripes formed by supercritical CO2 are combined, so that the medium and low frequency sound insulation index is improved; the bottom layer is repaired and guaranteed to be durable in impact resistance by virtue of a core-shell toughening agent and molecular chain extension; the defects of traditional products are overcome, and the service life requirement of sound barriers for expressways and rail transit is met.

The invention discloses a high-performance photochromic composite fabric and a preparation process thereof, and relates to the technical field of photochromic composite fabrics, the high-performance photochromic composite fabric is composed of a longitudinal fiber layer, a waterproof layer, combed cotton, cool fibers and a photochromic fiber layer; the longitudinal fiber layer is formed by interweaving chinlon and spandex, a waterproof layer is sprayed on the top of the longitudinal fiber layer, a photochromic fiber layer is connected to the top of the waterproof layer in a hot-pressing mode, combed cotton is connected to the bottom of the longitudinal fiber layer in a knitted mode, and cool fibers are connected to the bottom of the combed cotton in a knitted mode; and the surface of the photochromic fiber layer is coated with an ultraviolet light absorber. According to the photochromic composite fabric, the ultraviolet light absorber is sprayed on the surface of the photochromic composite fabric to fill gaps among the photochromic fiber layers, so that the number of ultraviolet rays reaching the photochromic material is reduced in the subsequent use process, the damage degree of the photochromic material due to photodegradation is reduced, and the service life of the fabric is prolonged.

The invention discloses a tetrapyridine pyrene-based metal organic cage as well as a preparation method and application thereof, and belongs to the technical field of supramolecular chemistry. The metal organic cage is prepared from a tetrapyridine pyrene ligand, a tetradentate sodium carboxylate ligand and a cis-platinum metal ligand, and the metal organic cage is endowed with photocatalytic performance by introducing a photosensitive group into the ligands, so that the metal organic cage can effectively degrade perfluorooctanoic acid through a photo-induced electron transfer mechanism, thereby realizing an adsorption-degradation integrated function. The metal organic cages can release effective reactive oxygen species under the irradiation of a 365 nm ultraviolet lamp and can degrade the perfluorooctanoic acid, the defluorination rate can reach 80%, the perfluorooctanoic acid is degraded into a short-chain compound, and a photodegradation system is artificially prepared.

Provided in the present invention are a reactive composite light stabilizer and the use thereof, and a light-stable modified polymer material. The reactive composite light stabilizer comprises a reactive ultraviolet light absorber and a reactive hindered amine light stabilizer, the reactive ultraviolet light absorber being a reactive triazine ultraviolet light absorber. The reactive triazine ultraviolet light absorber and the reactive hindered amine light stabilizer are combined to achieve a higher absorptivity, a better combining effect, a lower volatility and a higher light-degradation resistance stability, and, both being reactive components, they can exist in the form of chemical bonding in a polymer material, thus having a better long-effective property.

The invention belongs to the technical field of ion detection, antibiotic detection and dye degradation, and relates to a zinc complex as well as a preparation method and application thereof. The chemical formula of the zinc complex is [Zn (NPTH) (4, 4 '-BMIBP). 3H2O], 4, 4'-BMIBP is 4, 4 '-bis (2-methylimidazolyl) biphenyl, and H2NPTH is 3-nitrophthalic acid. The zinc complex disclosed by the invention has a fluorescence recognition function on ferric ions, bivalent copper ions and furantoin and can be used for detecting the ferric ions, the bivalent copper ions and the furantoin in an aqueous solution, and the quenching constants are 4.91 * 10 < 3 >, 1.11 * 10 < 4 > and 7.22 * 10 < 3 > respectively. The degradation rate of the zinc complex disclosed by the invention on methylene blue within 130 minutes is 91.44%.

The invention relates to the technical field of degradable particles, in particular to photodegradable drug-loaded particles as well as a preparation method and application thereof, and the photodegradable drug-loaded particles comprise a cross-linked polymer M1, a cross-linked polymer M2 and a polyelectrolyte polymer M3; wherein M2 contains a plurality of photocleavable groups; m3 contains a plurality of ionizable groups and is adsorbed with drug molecules through static electricity; m1, M2 and M3 all contain at least two terminal bridging groups, and the terminal bridging groups are mutually subjected to cross-linking reaction to form the photodegradable drug-loaded particles with a gel three-dimensional network structure. When being irradiated by light with specific wavelength, the particles are degraded due to chemical bond breakage; in addition, due to the existence of a gel three-dimensional network and ionizable groups in the particle material structure, various macromolecular or micromolecular drugs can be loaded. When the particles are irradiated by light, light degradation occurs, the medicine loaded in the particles is released, the degradation rate of the particles can be accurately controlled, and programmed release of the medicine can be achieved.

The present application relates to an embolic microsphere and a preparation method thereof and a drug-loaded embolic microsphere, belonging to the technical field of embolic microspheres. The embolic microspheres include a three-dimensional network structure formed by cross-linking polymerization of a polyhydroxy water-soluble polymer modified mainly by a photodegradation agent and a photosensitizer, a water-soluble monomer with a polymerizable double bond, and a water-soluble cross-linking agent, wherein the photosensitizer is covalently coupled to the photodegradation agent, and the photodegradation agent is covalently coupled to the polyhydroxy water-soluble polymer. The embolic microspheres can have the therapeutic effects of embolization and photodynamic therapy, and embolization therapy and photodynamic therapy can be synergistically treated to improve the therapeutic efficiency of tumors.

The invention belongs to the field of catalytic materials, and particularly relates to a preparation method and application of a bismuth oxybromide / indium oxide heterojunction photocatalytic material. The method specifically comprises the following steps: dispersing indium nitrate pentahydrate and p-dibenzoic acid in dimethylformamide, then carrying out hydrothermal reaction on the obtained mixed solution, collecting the product, washing and drying to obtain an indium oxide precursor; dispersing bismuth nitrate pentahydrate, sodium bromide and indium oxide precursors into deionized water, stirring, drying and collecting a white product; and calcining the obtained white product to obtain the bismuth oxybromide / indium oxide photocatalytic material. The obtained composite photocatalytic material is controllable in morphology, and rapid light degradation of tetracycline can be achieved.

The invention provides polyamide acid ester, photosensitive polyimide resin, a negative photoresist composition and application thereof. A covalent bond on a side chain of the polyamic acid ester contains a benzoylmethyl-containing structure, the structure has an ultraviolet light sensing function and can realize light degradation, so that the polyamic acid ester is converted into polyamic acid and primary alcohol, and the formed polyamic acid can be dissolved in a water-based developing agent, so that the targets of water-based developing and photoetching are realized. Besides, after the polyamic acid ester provided by the invention is imidized, no crosslinking component is left, and the polyamic acid ester has high mechanical property, high resolution, high film thickness and depth-to-width ratio gt; and 2.0, good performance can be achieved even if low-temperature curing is carried out.

The invention provides an organic wastewater degradation device system and method based on photocatalysis and plasma discharge. The device system comprises a three-dimensional photocatalysis and plasma synergistic degradation reaction device and a wastewater aeration treatment device, the degradation reaction device comprises an inner cylinder and an outer cylinder which are coaxially arranged, a plasma discharge inner electrode, a plasma discharge outer electrode, a glow discharge electrode, a wastewater conveying pipeline, a pulse xenon lamp and a spiral xenon lamp, and the first plasma generation cavity, the wastewater aeration treatment device and the wastewater conveying pipeline are sequentially communicated. According to the device system provided by the invention, a coaxial surrounding type plasma discharge structure is designed, gas-liquid secondary degradation is formed on the organic wastewater, glow discharge is designed on the two sides of a pipeline to enable a spiral xenon lamp to emit light, uniform three-dimensional xenon light degradation is formed by combining a pulse xenon lamp, and further through the synergistic effect of photocatalysis and a plasma field, the gas-liquid secondary degradation of the organic wastewater is realized. The degradation process of organic matters is enhanced, and the degradation efficiency of organic wastewater is improved.

A method of modifying biomechanical properties of tissue in a region of interest includes application of laser energy to one or more first volumes of tissue in the region of interest to cause softening via photodegradation, and application of laser energy to one or more second volumes of tissue within the region of interest to cause stiffening via photocrosslinking. The one or more second volumes are different from the one or more first volumes.

A method for forming a photoresist pattern includes: (i) a step of forming a photoresist film on a support using a photoresist composition; (ii) a step of exposing the photoresist film; and (iii) a step of developing the exposed photoresist film to form a photoresist pattern, characterized in that the photoresist composition contains: a resin (A) whose solubility in the developer changes due to the action of an acid, an acid-generating agent (B) that generates acid upon exposure, a photodegradable alkali (D1), a solvent (S), and a compound (X) represented by the following formula (x-1), wherein the amount of solvent remaining in the photoresist film formed in step (i) is 910 ppm or more, wherein R 1 ~R 4 It is a hydroxyl group or an alkyl group having 1 to 5 carbon atoms, R 5 and R 6 It is a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, or an alkyl group having 1 to 10 carbon atoms obtained by substitution with a hydroxyl group.

The invention provides a preparative liquid chromatography method of nifedipine photodegradation impurities. The method comprises the following steps: placing nifedipine under an illumination condition, carrying out isocratic elution on impurities generated by a sample by adopting preparative liquid chromatography, taking octadecylsilane chemically bonded silica as a stationary phase and taking acetonitrile-water as a mobile phase, collecting effluent at the wavelength of 265 nm, and enriching to obtain the nifedipine compound. The method is high in separation degree, and the purity of impurity monomers can reach 90% or above; acetonitrile-water is used as a mobile phase for elution, so that the method is simple and efficient; the method is suitable for separation of difficult-to-separate components. An impurity reference substance is more sufficiently provided for nifedipine impurity research, so that the quality of nifedipine is effectively controlled.

The present invention relates to an application of a photocomposite catalyst of a magnetic covalent organic framework structure. The following steps are included: 1) synthesizing magnetic Fe3O4 nanoparticles by a hydrothermal method; 2) subjecting Fe3O4 to amination treatment; 3) reacting NH2-Fe3O4 with 2,5-dimethoxybenzene-1,4-diformaldehyde (DMTP) in acetonitrile; 4) adding 1,3,5-tris(4-aminophenyl)benzene (TAPB) for cross-linking reaction; 5) separating the target product. This highly efficient and reusable photocatalytic degradation material can be used to treat drug residues such as tetracycline hydrochloride (TC-HCl) in wastewater. The synthesis reaction is simple and the conditions are mild. When the light is irradiated for 5 minutes, the degradation rate of TC-HCl can reach 57.34%, proving that it has good photodegradation ability and good magnetic recovery performance. After experimental verification of the photocatalytic degradation of a simulated tetracycline hydrochloride solution, the photocomposite catalyst of the magnetic covalent organic framework exhibits good degradation performance and long-term stability.

The application relates to a light-degradation-driven high-molecular nanomotor and a preparation method, and aims to solve the environmental pollution and biological safety problems caused by the degradation difficulty or long cycle of the nanomotor power assembly. The nanomotor has an asymmetric nanostructure and is assembled by a light-degradation high-molecular assembly and a biocompatible high-molecular effective load in a nanometer scale. The preparation method comprises the following steps: 1. uniformly mixing a light-degradation high-molecule and a biocompatible high-molecule in an organic solvent to prepare a mixture A; 2. mixing the mixture A and water at a high speed to prepare a mixture B; and 3. removing the organic solvent to prepare the nanomotor. Under light, the light-degradation assembly absorbs light energy to degrade and generate bubbles, which push the nanomotor to move in the solution. The start / stop of the nanomotor is controlled by the on / off of the light source, and the fast / slow movement of the nanomotor is controlled by the strong / weak of the light source. The structure of the light-degradation assembly is gradually degraded and finally completely destructed with the reaction, so that the biological safety and environmental pollution problems of the nanomaterial are relieved.