162 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.

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 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 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 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.

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.

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 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.

To inhibit a photo-degradation odor in a soft fruit juice-containing beverage.SOLUTION: A beverage contains soft fruit juice and peptide. The peptide may be a milk derived-peptide. The peptide may be a milk-derived casein peptide. In the beverage the peptide content may be 0.05-0.25 mass%. In the beverage the fruit juice content may be 5-50 mass%. The soft fruit juice may be grape juice.SELECTED DRAWING: None

A photoresist composition comprising one or more alkali-insoluble, non-solvent base materials present in a combined amount of more than 50 wt% based on the total solids of the photoresist composition; a non-polymeric ionic photoacid generator compound comprising an anion and an iodonium or sulfonium cation, the anion being represented by formula (1); a photodegradable quencher, a basic quencher or a combination thereof and a solvent: where Ar 1 for a monocyclic or polycyclic aromatic C 3-60 -Group stands; L 1 L represents a single bond or one or more binary linkage groups. 1 is free of fluorine; Z 1 an anion-stabilizing group, wherein Z 1is designed in such a way that it forms an intramolecular non-covalent bond with the sulfonate anion group, forming a ring with 5 to 8 atoms; and the remaining substituents are defined as shown here.

A method, system, and apparatus for PFAS destruction, comprising: oxidatively pre-treating an aqueous foam separation solution containing PFAS by mixing the aqueous foam separation solution with a persulfate and an acid or base to raise or lower the pH, and then oxidizing the aqueous foam separation solution to form a pre-treatment solution; and then subjecting the pre-treatment solution to UV photodegradation, for example, by inducing UV light of 222 nm, 254 nm, and / or 185 nm into the pre-treated aqueous foam separation solution. The oxidation of the aqueous foam separation solution may include exposing the aqueous foam separation solution to elevated temperature and elevated pressure for a period of time sufficient for thermal oxidation, or subjecting the aqueous foam separation solution to ozono-oxidation.

The invention relates to the technical field of Pickering emulsion preparation, and discloses a functionalized mesoporous silicon particle, a Pickering emulsion as well as a preparation method and application of the Pickering emulsion. The functionalized meso-porous silicon particles comprise meso-porous silicon particles and silicon dioxide shell layers coating the surfaces of the meso-porous silicon particles; wherein an ultraviolet filtering agent is loaded in the meso-porous silicon particles. The functionalized meso-porous silicon particle provided by the invention not only reduces free radicals generated by photodegradation of an ultraviolet filtering agent by 89.3%, effectively overcomes the contradiction of'protection-damage 'in traditional ultraviolet protection, but also reduces the wettability of the particle from 114.7 degrees to 89.6 degrees, so that the particle has excellent emulsion stability and ultraviolet shielding function, and meanwhile, the functional meso-porous silicon particle can be applied to the field of ultraviolet protection. The secondary silicon layer packaging also reduces the leakage of the ultraviolet filtering agent; when the functionalized meso-porous silicon particle is used as an emulsifier for preparing a Pickering emulsion carrying a photosensitive active matter, a corresponding ultraviolet filtering agent is matched aiming at a sensitive wave band (UVA or UVB) of the photosensitive active matter, so that customized and high-efficiency light protection is realized.

The invention discloses an ultraviolet-responsive degradable polyester and a preparation method thereof, the ultraviolet-responsive degradable polyester is a copolyester composed of an aliphatic polyester segment and a photosensitive o-nitrobenzyl ester segment, and the ultraviolet-responsive degradable polyester is prepared by carrying out ring-opening-condensation cascade polymerization on aliphatic cyclic diol diacid ester and o-nitrobenzene dimethanol as monomers. Or dibasic acid, dihydric alcohol and o-nitrobenzene dimethyl carbinol are used as monomers to be prepared through condensation polymerization. The main chain of the polyester contains a photo-response unit based on o-nitrobenzyl ester, intramolecular isomerization can occur under ultraviolet irradiation and causes breakage of a molecular chain, and the molecular weight of the polymer can be quickly reduced in a short time to form a low-molecular-weight degradation product; the degradation product has certain solubility in alcohol, water or alkaline alcohol water solution and the like, and can be dissolved by using the solvent; through the dissolvability difference of an exposed part and a non-exposed part in the solvent, the solvent can be applied to the field of ultraviolet light degradation materials such as photoresists and the like.

The application belongs to the technical field of environmental material synthesis, and particularly relates to a method for synthesizing a composite film by means of NMP-induced surface self-corrosion assisted rapid spin coating and application thereof; the steps are as follows: firstly, PDI and PEDOT are prepared, then a photocatalyst is prepared by means of a microwave method and a surface imprinting technology, and then the photocatalyst is embedded in surface pores of a PVDF film by means of NMP-induced surface self-corrosion assisted rapid spin coating to prepare an imprinting composite film with high stability and high permeability; the imprinting PDI / PEDOT photocatalyst is firmly embedded in the surface pores of the PVDF film, the stability is effectively improved, and a high water flux and a high light degradation activity are maintained. In addition, the construction of a heterojunction structure and the existence of imprinting cavities endow the imprinting composite film with good self-cleaning performance, photocatalytic performance and significant selectivity, and the imprinting composite film has a wide application prospect.

Provided herein are stabilizer compositions, along with master concentrate compositions containing the stabilizer compositions, and methods of using them for stabilizing organic materials to protect against photodegradation and thermal degradation due to exposure to UV radiation, the stabilizer compositions having a stabilizing amount of at least one co-stabilizer, and a stabilizing amount of any one or more ultraviolet absorbers selected from an ortho-hydroxyphenyl triazine, an ortho-hydroxybenzophenone, or an ortho-hydroxyphenyl benzotriazole, optionally in combination with a stabilizing amount of a hindered amine light stabilizer.

The invention discloses a cesium-tungsten bronze composite molybdenum disulfide material for photodegradation and a preparation method thereof, the material is formed by compounding molybdenum disulfide powder and cesium-tungsten bronze powder according to the mass ratio of 1: 3-2: 3, a final product is blue black powder, and the preparation method comprises the step of compounding the molybdenum disulfide powder and the cesium-tungsten bronze powder according to the mass ratio of 1: 3-2: 3. The final product is blue black powder, and the preparation method comprises the following six specific steps and conditions: preparing molybdenum disulfide powder, compounding a cesium tungsten bronze coating layer, dissolving a tungsten source in absolute ethyl alcohol, adding a cesium source and molybdenum disulfide powder, adding acetic acid, and performing post-treatment to obtain blue black cesium tungsten bronze compounded molybdenum disulfide photocatalyst powder. The preparation method has the advantages of simplicity, mild reaction conditions, low energy consumption, considerable high degradation efficiency on organic pollutants, promotion effect on full-spectrum photocatalytic degradation, simple process, low cost, suitability for industrial production and the like.

This invention provides an easily recyclable, floating cyano-modified carbon nitride catalytic reactor for the natural photodegradation of polluted water bodies from dyeing and printing industries, along with its preparation method and application, belonging to the field of photocatalytic water treatment. Addressing the problems of difficult recovery and low carrier separation efficiency of traditional powder photocatalysts, this invention provides a carbon nitride photocatalytic material co-modified with cyano and sodium ions. This material is loaded onto graphite felt to form a photocatalytic film, which is then wrapped and fixed by an anti-floating mesh to constitute a floating catalytic reactor. The strong electron-withdrawing effect of cyano groups and the intercalation coordination effect of sodium ions synergistically promote the separation and migration of photogenerated carriers. This reactor is self-floating and easily recyclable, and can efficiently degrade organic dye pollutants in dyeing and printing water bodies under natural light, making it suitable for the remediation of static or slow-flowing water bodies such as rivers in dyeing and printing industrial parks. This invention features a stable structure, easy recovery, and modular deployment, providing a feasible solution for the transformation of photocatalytic technology into practical dyeing and printing water treatment projects.

The invention relates to the field of organic chemical materials, in particular to a conductive polymer material and application. The polymer material is synthesized by accurately introducing a specific functional group with strong ultraviolet absorption capacity into a polymer main chain based on a novel molecular design, so that a multifunctional conductive polymer with an efficient ultraviolet protection function and excellent electrochemical activity is constructed. The material not only can effectively shield ultraviolet rays and protect an electrochromic layer from being degraded by light, but also can remarkably enhance the response speed and coloring efficiency of an electrochromic device and greatly improve the cycling stability of the device due to the optimized energy band structure and ion transmission characteristic of the material, and has a huge prospect in the application of an electrochromic intelligent window and the like.

The application discloses a preparation method and application of a Ti3C2-MXene / TiO2 Schottky heterojunction fiber photocatalyst, develops an alkalization / delocalization process to treat a Ti3C2-MXene colloidal solution, then converts the two-dimensional Ti3C2-MXene colloidal solution into a one-dimensional fiber structure through a wet spinning technology, and finally obtains the Ti3C2-MXene / TiO2 composite fiber material through calcination in a tube furnace. The catalyst is a visible light catalyst with novel structure and excellent catalytic performance, has good light degradation capacity on organic pollutants under visible light, and has a stable fiber structure, and has the properties of recyclability and reusability when applied in water. Meanwhile, the catalyst has the characteristics of simple preparation process, environmental friendliness, high efficiency, energy saving, environmental protection, low cost, safety and the like, is suitable for large-scale production and preparation, and has a good application prospect in the fields of sewage treatment and waste gas treatment.

The invention belongs to the technical field of photocatalysis, and provides a preparation method and application of a composite photocatalyst for photodegradation of lignin, the preparation method comprises synthesis of indium zinc sulfide, synthesis of bismuth tungstate and preparation of the composite photocatalyst ZnIn2S4 / Bi2WO6, and the composite photocatalyst is used for photodegradation of lignin in water. According to the present invention, the precursor indium zinc sulfide and the bismuth tungstate are synthesized through the hydrothermal method, and according to the morphology, the different response to light and the inherent characteristics of the indium zinc sulfide and the bismuth tungstate, the ZnIn2S4 / Bi2WO6 Z-type heterojunction is constructed from the indium zinc sulfide and the bismuth tungstate through the physical grinding in-situ method, and the composite photocatalyst has characteristics of more active sites, good light absorption ability, good charge transfer efficiency, and good photocatalytic activity. And the capability of photocatalytic degradation of lignin under visible light is obviously improved.

This invention discloses a method for preparing avermectin nanoparticles supported on zein-sodium lignin sulfonate, and its applications. The preparation method involves dissolving avermectin and zein in an organic solvent to form a solution (stream 1), and dissolving sodium lignin sulfonate or modified sodium lignin sulfonate in deionized water to form a solution (stream 2). Both streams are simultaneously injected into a dual-channel confined counter-current mixer for rapid mixing. The resulting nanoparticle suspension is then collected, completing the preparation process. This invention utilizes the compatibility of hydrophobic zein with avermectin, combined with the self-assembly properties of zein and the use of sodium lignin sulfonate or modified sodium lignin sulfonate as a stabilizer, to prepare avermectin nanoparticles with high drug encapsulation efficiency and excellent drug release performance. Furthermore, these nanoparticles exhibit excellent resistance to UV photodegradation, effectively reducing the photodegradation of avermectin. The method is simple, rapid, and easy to control.

The invention belongs to the technical field of drug analysis, and discloses a method for determining photodegradation impurities in ofloxacin ear drops, which adopts high performance liquid chromatography, takes octadecylsilane chemically bonded silica as a filler, and takes a citric acid solution and acetonitrile as mobile phases to analyze the impurities generated by photodegradation in the ofloxacin ear drops. And measuring the peak area of the impurities in the test solution and the main peak area of the contrast solution by adopting a main component self-contrast method without adding a correction factor, and calculating the content of the impurities. The method can rapidly and accurately analyze ofloxacin photodegradation impurities, is strong in specificity, good in separation degree, stable and reliable, and can realize quality control of ofloxacin ear drops.

The disclosure relates to photocleavable crosslinkers that are suitable for preparing photodegradable hydrogels and to methods for volumetric imaging of biological specimens by photochemical sectioning and imaging of photodegradable hydrogels. A photocleavable crosslinker according to the disclosure can include one or more water-soluble hydrocarbon linkers, two or more reactive functional groups such as ethylenically unsaturated groups, and one or more photocleavable groups. A crosslinked hydrogel can be formed between the photocleavable crosslinker and other hydrogel monomers. The crosslinked hydrogel can be used as a matrix immobilize a biological or other sample material in a hydrogel composite. The hydrogel composite and the sample material therein can be volumetric imaged by sequentially and repeatedly optically imaging an image layer of the hydrogel composite and then photochemically sectioning a depolymerization layer of the hydrogel composite.

The beverage contains an anthocyanin. A copper ion is blended into the beverage containing the anthocyanin. When a copper ion content is “B” ppm and an anthocyanin content is “A” ppm, a ratio of B / A, is adjusted to 0.000003 or more. It was found that an effect of photodegradation of the anthocyanin can be suppressed.

This invention belongs to the field of film production technology, specifically relating to a non-starch-based biodegradable polyethylene film and its preparation method. The non-starch-based biodegradable polyethylene film comprises the following raw materials in parts by weight: 30-50 parts LDPE, 30-50 parts LLDPE, 5-20 parts HDPE, 0.1-0.8 parts photosensitive system, and 0.5-4 parts biodegradable system. This invention uses polyethylene resin as the base material, combined with a specific photosensitive system and biodegradable system, and is prepared using a masterbatch method and a direct method. A floating dyeing process ensures uniform dispersion of additives, and a standardized blown film and thickness control process ensures that the resulting film requires no starch filler. It possesses mechanical properties that meet application requirements and achieves a synergistic effect of photodegradation and biodegradation. After field use, it gradually and completely degrades, avoiding soil pollution, thus balancing practicality and environmental friendliness.

The invention relates to the technical field of chemical engineering and equipment, and discloses a continuous feeding reaction device for lignin photodegradation, which comprises a reaction tube, an LED light source array and a transducer arranged outside the reaction tube, and a rotating shaft arranged inside the reaction tube and driven by a rotation driving mechanism. A composite scraping mechanism is mounted on the rotating shaft and is used for forcibly scraping reaction liquid on the inner wall of the reaction tube to form a thin film. The transducer is used for generating an ultrasonic standing wave field to drive photocatalyst particles to form a high-density array; the LED light source array works in a pulse mode, and the triggering time of light pulses of the LED light source array is matched with the time when the density of the catalyst array reaches a peak value. Through the synergistic effect of dynamic film scraping self-cleaning, the sound field tissue catalyst and pulsed light synchronous irradiation, the problems of light shielding, easy blockage and slow mass transfer in a high-viscosity dark multiphase system are solved, and the reaction efficiency and stability are improved.

The drug photodegradation device comprises a test box, an opening of the test box is rightward, the test box is of a double-layer structure design, a sealing frame is arranged in the right end of the test box and fixedly connected to the inner wall of the test box, the rear side of the right end of the test box is rotationally connected with a box door, and the right end of the test box is fixedly connected with the box door. The front end of the box door is fixedly connected with a sealing plate, a plurality of LED lamp strips and a plurality of ultraviolet lamp strips are arranged in the lamp panel and are vertically and transversely distributed at intervals, standard cold light and ultraviolet light can be emitted, different experiment requirements are met, starting and stopping of the LED lamp strips and the illuminance can be controlled through a cold light control knob, and the experiment efficiency is improved. Starting and stopping of the ultraviolet lamp strips and the wavelength of ultraviolet light are controlled through the two ultraviolet control buttons, a light source is convenient to control, the two sets of lamp beads of the multiple ultraviolet lamp strips can be independently controlled, precise adjustment is achieved, the LED lamp strips, the ultraviolet lamp strips and the two sets of lamp beads in the ultraviolet lamp strips can be independently used and can also be used in a mixed mode, and the service life of the LED lamp strips is prolonged. And the device is suitable for photodegradation experiments under different conditions.

The present application provides a kind of microcapsule aqueous dispersion and preparation method and its application in water-based photosensitive solder resist ink.The microcapsule aqueous dispersion is shell-core structure, the core material of the microcapsule aqueous dispersion is water-soluble basic epoxy acrylate resin, the wall material of the microcapsule aqueous dispersion is ultraviolet light degradable resin, and the ultraviolet light degradable resin is selected from urea-formaldehyde resin or melamine-formaldehyde resin.Microcapsule aqueous dispersion is configured into water-based photosensitive solder resist ink with conventional water-based alkali-soluble epoxy acrylate resin, hydrophilic multifunctional acrylate reactive diluent, photoinitiator, auxiliary agent and water.This application realizes the physical isolation and light-controlled release of basic active component through microcapsule technology, fundamentally solves the poor long-term storage stability of traditional water-based solder resist ink, the poor pattern accuracy caused by uneven volatilization of amine neutralizer, and the contradiction between alkali-soluble requirement and chemical resistance.

The application provides a photobiodegradable material, which comprises degradable microspheres prepared by blending polylactic acid, polycaprolactone and a photosensitizer; the degradable microspheres are prepared by polymerization of at least 66-92 parts of polylactic acid, 4-30 parts of polycaprolactone and 0.2-5 parts of the photosensitizer by weight. The photobiodegradable material has a simple preparation method, and by changing the preparation process and raw materials, a composite material with controllable microsphere size, uniform particle size and photodegradation performance and biodegradation performance is obtained, which greatly improves the poor degradation efficiency of the biodegradable material under seawater conditions.

The application discloses a kind of polydopamine (PDA) modified BTO / Ag / TiC composite material and preparation method thereof.By introducing PDA into BTO / Ag / TiC composite material system, the conductivity of the material, carrier concentration are significantly improved, thereby improving its performance in electrochemical sensing, photodegradation and antibacterial and the like.The method is simple, low in cost, and the prepared composite material shows excellent photoelectric conversion performance, antibacterial performance and photocatalytic performance.The composite material is widely used in electrochemical sensor, photocatalytic degradation and antibacterial field, and lays a solid foundation for the wide application of the material.