187 results about "Singlet oxygen" patented technology

The invention provides an efficient chloramphenicol degradation method based on Co-Cu-carbon composite nano-catalyst activated peroxymonosulfate, which comprises the following steps: regulating the Co / Cu molar ratio in a bimetal organic framework precursor, and performing pyrolysis to prepare the Co-Cu-carbon composite catalyst with an optimized pore structure, graphitization degree and metal dispersity; peroxymonosulfate is activated by utilizing the synergistic effect of Co / Co and Cu / Cu redox pairs to generate sulfate free radicals, hydroxyl free radicals, singlet oxygen and superoxide free radicals, and direct oxidative degradation of chloramphenicol is promoted by taking a catalyst as an electron transfer bridge; the method realizes rapid and efficient removal of chloramphenicol, high mineralization rate, excellent cycle stability and strong anti-interference capability, and solves the technical problems of low removal efficiency, high cost and easy secondary pollution in the prior art.

The invention provides an oxygen vacancy defect carbon nitride anchored iron atom cluster catalyst and a preparation method and application thereof, and belongs to the technical field of catalysts. Iron atoms are anchored in a carbon nitride (Ov-C3N4) structure containing oxygen vacancy defects in a cluster form, and Fe-Ov-C defect bonds are formed between the oxygen vacancy defects in C3N4 and iron atom clusters to stabilize the iron atom clusters, so that the problem of thermodynamic instability of the catalyst is solved while higher atom utilization efficiency is obtained; the Fe-Ov-C defect bond atoms can reasonably regulate and control the electronic structure of the center of an iron cluster d band, so that the catalytic activity and the cycling stability are greatly enhanced; besides, iron atom clusters and persulfate act to cause O-O bond breakage, non-free radical singlet oxygen is formed, and the problem that the catalytic efficiency is sharply reduced due to free radical annihilation in a complex water environment can be effectively solved.

The invention belongs to the technical field of organic dye synthesis and application, and discloses a conjugated compound containing a benzothiophenazine structure as well as a preparation method and application thereof, and the conjugated compound containing the benzothiophenazine structure has excellent photophysical properties, singlet oxygen yield and superoxide anion generation capacity. The novel conjugated compounds ENBO-NI and ENBS-NI containing benzothiophenazine structures are successfully prepared by replacing a benzene ring of Nile blue with a cycloalkane structure and adjusting the electron donating ability of an R1 group. The two compounds have near infrared fluorescence emission, good solubility and relatively high ROS yield. Compared with a classical photosensitizer NB, the singlet oxygen yield of ENBO-NI is increased by about 117.65%, and the singlet oxygen yield of ENBS-NI is as high as 70%. The absorption wavelength of the conjugated compound is in a red light wave band. The preparation process is simple and efficient, large-scale production is easy, and the preparation method has a wide clinical application prospect.

The invention relates to a silver-iron diatom modified carbon nitride (AgFe-CN) photocatalytic material capable of synchronously removing organic pollutants and pathogenic bacteria as well as a preparation method and application of the silver-iron diatom modified carbon nitride (AgFe-CN) photocatalytic material, and belongs to the field of environmental chemistry and material science. The catalyst is prepared through a supramolecular coordination-thermal polymerization method, wherein silver and iron are highly dispersed on a porous carbon nitride substrate in a monatomic form. The monatomic Ag and Fe synergistically construct an electron channel, and jointly endow the catalyst with excellent photocatalytic activity. The preparation method comprises the following steps: combining the catalyst with peroxymonosulfate (PMS) to construct an AgFe-CN / PMS / Vis photocatalytic Fenton-like synergistic system; in the system, the catalyst can lead generation of an advanced oxidation system which takes singlet oxygen as a main component and cooperates with superoxide free radicals and high-valence iron oxygen species, so that efficient and synchronous removal of various organic pollutants and pathogenic microorganisms in the water body is realized. The catalyst is simple in preparation process and mild in condition, and the constructed water treatment method is high in efficiency, high in universality and good in stability and has wide application prospects.

The invention relates to the technical field of nano materials and biomedical engineering, and discloses a dye-sensitized rare earth up-conversion luminescent nano material as well as a preparation method and application thereof. The dye-sensitized rare earth up-conversion luminescent nano-material comprises a rare earth doped up-conversion nano-particle core, an unsaturated fatty acid salt self-assembled shell layer and a near-infrared dye modified on the surface of the rare earth doped up-conversion nano-particle. The unsaturated fatty acid salt coating layer endows the material with excellent water dispersibility through a hydrophilic group; a hydrophobic chain segment and an unsaturated double bond can effectively block water and oxygen permeation and quench singlet oxygen, so that the photobleaching half-life period of the material is increased by 86.7 times or more compared with that of a conventional coating material, and the light stability is excellent; the material successfully realizes efficient up-conversion luminescence under excitation of a low-power near-infrared light emitting diode (NIR LED, the power density of which can be as low as 100mW / cm < 2 >), and thoroughly gets rid of dependence on a high-cost and high-risk laser.

The invention discloses a method for catalytically degrading dye wastewater based on tetrahedrite. The method comprises the steps that tetrahedrite is subjected to mechanical activation and then mixed with peroxymonosulfate, the mixture is added into dye wastewater, the initial pH of a system is adjusted, a catalytic degradation reaction is carried out, tetrahedrite is recovered after the reaction is finished, and tetrahedrite is obtained. The mass molar ratio of tetrahedrite to peroxymonosulfate is (0.33-6): 1g / mmol; the mass ratio of tetrahedrite to organic residues in the dye wastewater is (10-80): 1. According to the method, active sites on the surface of tetrahedrite are used for adsorbing PMS molecules, PMS is activated through electron transfer to generate active free radicals, singlet oxygen in the active free radicals plays a main role, superoxide free radicals and sulfate free radicals play auxiliary roles, and therefore the catalytic activity and the degradation rate of organic matter in dye wastewater are greatly improved.

This invention discloses a homogeneous microsphere based on singlet oxygen self-circulating aggregation-induced emission, its preparation, and a wash-free detection method, which improves the sensitivity and efficiency of wash-free luminescent oxygen channel immunoassay. This invention successfully prepared AIE receptor microspheres by embedding the photosensitizer AIER dye, ultra-bright AIEG dye, and singlet oxygen-responsive dye SO into carboxyl-modified polystyrene nanoparticles. Simultaneously, an antibody-1-labeled AIE receptor microsphere solution, an antigen-containing test solution, and biotinylated antibody-2 were added to a 96-well plate, followed by streptavidin-modified donor microspheres. After wash-free incubation, the fluorescence signal value was measured, and the concentration of antigen in the test solution was obtained according to a standard curve. This platform completes wash-free, highly sensitive detection within 5 minutes, innovatively combining the aggregation-induced emission characteristics of AIEgens and a singlet oxygen cycling strategy, providing an efficient and universal solution for wash-free diagnostics.

The application belongs to the field of heavy metal water pollution treatment, and relates to a method for rapidly and efficiently oxidizing trivalent arsenic through enhanced electron transfer, which comprises multifunctional biochar preparation and efficient oxidation process design. The method uses sludge as a biochar precursor, obtains multifunctional biochar with strong alkalinity, high specific surface area and super electron conduction through high-temperature pyrolysis, directly introduces oxygen into an As(III) solution, adds the biochar into the system after the aeration is completed, and fully stirs. The method is simple, economically feasible, has extremely high oxidation efficiency, does not require additional chemical reagents, has no reagent residues, and does not require external light or electricity. The non-free radical oxidation path dominated by electron transfer and singlet oxygen is not easily affected by inorganic ions and humic acid in actual water bodies, has strong anti-interference ability, and has a wide application range. The application not only helps to enrich the catalytic oxidation theoretical system, but also greatly improves the practical feasibility of biochar application, and has good environmental and economic benefits.

The invention discloses a method for treating antibiotic wastewater by using a nano confinement iron cluster catalyst. The method comprises the following steps: mixing and pyrolyzing an iron-containing compound and a carbon and nitrogen-containing precursor to prepare the nano confinement iron cluster catalyst, and then, adding the catalyst and an oxidizing agent into antibiotic-containing wastewater to carry out catalytic oxidation reaction. According to the catalyst, a high-activity iron cluster is stabilized by utilizing a nano confinement effect, an oxidizing agent can be efficiently activated, antibiotics are rapidly degraded through a non-free radical path with synergistic singlet oxygen and electron transfer, and the catalyst shows excellent catalytic activity, cycling stability and adaptability to different water qualities. The method is simple in process, mild in condition and environment-friendly, and a new strategy is provided for efficient deep treatment of the antibiotic wastewater.

The invention discloses a self-aggregation-induced emission type photosensitizer and a preparation method and application thereof. The photosensitizer has excellent AIE performance, and singlet oxygen can be efficiently generated after aggregation in a physiological environment; and the photosensitizer can effectively overcome the aggregation-induced quenching phenomenon, and has a synergistic effect with the lovir drugs, so that the anti-herpes virus activity is remarkably improved, and the dosage and side effects are reduced.

The present application relates to the field of environmental protection, and more particularly to an air treatment system and method based on TPOS phase transfer targeted catalysis technology. The system comprises a gas delivery unit, a free radical enhancement assembly, a phase transfer reactor, a catalysis assembly, and an intelligent control module. The gas delivery unit sends waste gas into the system, and uses ozone and singlet oxygen to preliminarily oxidize the waste gas. The free radical enhancement assembly comprises an aerosol generation unit. The aerosol generation unit converts the prepared free radical precursor solution into fine aerosol droplets. The phase transfer reactor is internally provided with a catalysis layer. The catalysis mode of the catalysis layer includes catalyst catalysis, heating catalysis, electrochemical catalysis, and ultraviolet light catalysis. The intelligent control module monitors the air treatment system in real time. Through the innovative design of multi-free radical synergistic oxidation, adjustable self-cleaning catalysis, intelligent control, and heat energy recovery, the present application realizes efficient purification, deep sterilization, energy saving and consumption reduction, and safe operation of waste gas.

The invention relates to the technical field of pharmaceutical preparations, in particular to composite condensing gel based on photodynamic therapy and a preparation method of the composite condensing gel. The preparation method of the composite condensate gel based on photodynamic therapy comprises the following steps: preparing a BSA (Bovine Serum Albumin) solution, uniformly mixing an inulin mother solution with the BSA solution, adjusting the pH value, heating in a water bath, cooling to room temperature, adding 5-aminolevulinic acid methyl ester hydrochloride into the condensate gel, adding an acid coagulant, diluting, and filling CO2 gas. According to the invention, CO2 is added into the composite condensation gel, so that the binding force of hemoglobin and O2 in tissues absorbing the composite condensation gel is reduced, and the concentration of free oxygen is improved, so that the composite condensation gel can transfer energy to surrounding oxygen and generate singlet oxygen with strong activity, thereby killing cancer cells and achieving the effect of improving the curative effect of photodynamic therapy.

This invention relates to the fields of brachytherapy and radiosensitization, specifically providing a... 125 I-nano implantable particles, their preparation methods, and applications. 125 The 1-nanometer implanted particles have a core-shell structure, consisting of a particle core and particles adsorbed on the outer surface of the particle core. 125 I and the particles encapsulated in the nucleus and 125 The outer shell of the I-type photosensitizer is a covalent organic framework. This invention... 125 The core of the I-nanometer implanted particle is used to enhance the energy deposition of gamma rays and X-rays, generating more hydroxyl radicals; the shell containing a type I photosensitizer is used to absorb the energy of Auger electrons and internal conversion electrons and excite the photosensitizer to generate singlet oxygen, effectively improving the response to... 125 The efficiency of I decay energy utilization. 125 I-nano implanted particles, combined with internal radiation therapy and radiodynamic therapy, destroy tumor cell DNA and cell membranes, enhance tumor killing and induce immunogenic cell death, thereby activating anti-tumor immunity and inducing remote effects.

Provided is a compound represented by general formula (I). In general formula (I), X1 to X8 each independently represent a hydrogen atom or a substituent (which is not a halogen atom), X1 and X2, X3 and X4, X5 and X6, and X7 and X8 each may independently be bonded to each other via a substituent to form a benzene ring, Y represents an oxygen atom or a sulfur atom, and R1 to R8 each independently represent an organic group, with the proviso that when Y is an oxygen atom, not all of R1 to R8 are phenyl groups.

It is an object of the present invention to provide a compound that has absorption in a near infrared region, has high efficiency of singlet oxygen generation (quantum yield), and also has high tumor toxicity when it is combined with an immunotoxin. According to the present invention, provided is a compound represented by the following formula (1) or a salt thereof:wherein L1 and L2 each independently represent a single bond, —O—, —CO—, an alkylene group containing 1 to 8 carbon atoms, a sugar chain, or a combination thereof; R1 and R2 each independently represent an alkyl group containing 1 to 8 carbon atoms, a carboxylic acid group, an amino group, a hydroxyl group, a thiol group, or a biotin residue; R3, R4, R5, R6, R7 and R8 each independently represent an alkyl group containing 1 to 8 carbon atoms, a phenyl group, a carboxylic acid group, an amino group, a hydroxyl group, a thiol group, or a biotin residue; and M represents Mg, Zn, Fe, P, Si, Cu, Sn, Al, Ti, Mo, or Ni.

The application provides an electrochemical double membrane reactor and a wastewater treatment method based on the electrochemical double membrane reactor, and belongs to the field of membrane separation and electrochemical advanced oxidation technology. The wastewater treatment method based on the electrochemical double membrane reactor is coupled with membrane separation and electrochemical advanced oxidation technology, a first conductive microporous membrane is used as an anode membrane, a second conductive microporous membrane is used as a cathode membrane, the anode membrane generates hydroxyl radicals by electrolysis of water, the cathode membrane generates H2O2 by electro-reduction of oxygen and further converts the H2O2 into hydroxyl radicals through a Fenton catalyst, and the two cooperate to generate singlet oxygen, so that removal of refractory organic matter and / or heavy metals in wastewater is realized. The electrochemical double membrane reactor can make multiple active substances act together in the electrochemical process, removal of refractory organic matter and heavy metals in wastewater is realized, and the electrochemical double membrane reactor can be widely applied to treatment and reuse of industrial wastewater, landfill leachate and the like.

The application discloses a photosensitizer targeting beta amyloid, and a preparation method and application thereof. The photosensitizer is a photosensitizer with A-D-A configuration, and a structural formula thereof is shown as formula I. The photosensitizer synthesized in the application has a longer emission wavelength, and after being combined with beta amyloid, the fluorescence signal is obviously enhanced, and can effectively generate singlet oxygen, that is, the photosensitizer can target mark A beta protein, and is used for fluorescence imaging of the A beta protein; and after the photosensitizer synthesized in the application is combined with beta amyloid in the brain of an Alzheimer's disease (AD) model mouse, the cognitive ability of the AD mouse can be effectively improved, A beta-mediated neurotoxicity can be reduced, and clearance of A beta plaques can be promoted, that is, the photosensitizer can be used for early diagnosis and treatment of Alzheimer's disease.

The invention relates to a metal organic framework for improving charge separation efficiency based on a conjugated benzene ring, a preparation method thereof and application of the metal organic framework in degradation of methyl orange. The invention relates to a complex of MOF-2 [Zn8 (NDC) 8 (TRZ) 8] n, in which NDC is 2, 6-naphthalenedicarboxylic acid, and TRZ is 1, 2, 4-triazole, and a preparation method of the complex of MOF-2 [Zn8 (NDC) 8 (TRZ) 8] n. The extended pi conjugation in MOF-2 results in significant improvements, including reduced band gap, enhanced visible light absorption, and more excellent charge separation efficiency, as proved by comprehensive ultraviolet-visible spectroscopic analysis, electrochemical analysis, and valence band-XPS measurements. 83.8% of methyl orange degradation is realized by the MOF-2 under the irradiation of visible light within 30 minutes. According to mechanism research performed by using a free radical capture technology and electron spin resonance (ESR) spectroscopy, superoxide free radicals (. O2 <->), singlet oxygen (1O2) and hydroxyl free radicals (. OH) are determined as main active species.

The invention relates to the technical field of wastewater treatment, in particular to an electrocatalytic organic wastewater treatment device which comprises a tank body, an outer barrel and an inner barrel, the outer barrel and the inner barrel are arranged in the tank body, the inner barrel is arranged in the outer barrel, a first reaction area is arranged in the inner barrel, a second reaction area is formed between the inner barrel and the outer barrel, and a third reaction area is formed between the outer barrel and the tank body. A communicating hole is formed in the inner barrel and is communicated with the first reaction area and the second reaction area, and an overflow hole is formed in the outer barrel; a feeding assembly is arranged in the first reaction area, polytetrafluoroethylene balls are arranged in the second reaction area, and a waste treatment assembly is arranged in the third reaction area. Meanwhile, non-free-radical active species such as singlet oxygen generated by air on the surfaces of an electric field, ultrasonic waves and a polytetrafluoroethylene material are combined to form a double-effect oxidation system under the combined action of free radicals and non-free radicals, so that the degradation efficiency of organic pollutants is remarkably improved, and the application range of the organic pollutants is remarkably widened.

The application provides a Mo and K co-doped MnO2 catalyst, which is obtained by doping Mo and K in alpha-MnO2 nanowires, and Mo and K are uniformly distributed on the surface and tunnel structure of the alpha-MnO2 nanowires, and the catalyst has a hydroxyl functional group. The application also provides a preparation method of the catalyst, and a method for degrading pollutants by activating peracetic acid with the catalyst, wherein peracetic acid and the catalyst are added into wastewater containing organic pollutants under stirring, and the pH value of the wastewater is controlled to be 5-9; in the wastewater treatment process, the catalyst activates the peracetic acid to generate organic free radicals and singlet oxygen to degrade the organic pollutants in the wastewater. The application can improve the ability of the MnO2-based catalyst to activate peracetic acid to generate active species to degrade organic pollutants, and solves the problems that the existing MnO2-based catalyst has low ability to activate peracetic acid and poor degradation ability for organic pollutants.

The invention belongs to the technical field of nano-catalyst antibiosis, and particularly relates to a zinc-based nitrogen-doped carbon-loaded metal palladium nano-enzyme as well as a preparation method and application thereof. The ZnNC-loaded metal palladium nano-enzyme is prepared by adopting a deposition-precipitation method which is simple to operate, taking ZnNC as a carrier and taking metal palladium nano-particles as an active center. The nano-enzyme has excellent oxidase-like activity, can catalyze O2 to generate hydroxyl free radicals (. OH), singlet oxygen (< 1 > O2) and superoxide anion free radicals (O2 <->) so as to kill bacteria and achieve an antibacterial effect, and has a remarkable antibacterial effect on escherichia coli under an acidic condition.

The application discloses a tungsten oxide photocatalyst capable of selectively generating singlet oxygen and a preparation method and application thereof, and the preparation method comprises the following steps: S1, uniformly mixing a small molecule regulator, ethanol and water to obtain a mixed solution; S2, adding a tungsten element compound into the mixed solution to stir and dissolve, obtaining a yellow solution, and then adding the small molecule regulator until the solution turns blue; S3, placing the blue solution obtained in S2 into a hydrothermal reaction device to react, and after the reaction is completed, washing and drying the solid to obtain the tungsten oxide photocatalyst capable of selectively generating singlet oxygen. The tungsten oxide photocatalyst provided by the application can degrade various organic pollutants, and has the advantages of simple preparation method, low cost, macro-preparation, and suitability for industrial production and the like. The prepared tungsten oxide photocatalyst can be applied to the field of photocatalytic degradation of organic pollutants and the like.

The present invention relates to an assembly comprising a carbon nanotube coated successively with: a primary coating resulting from the polymerisation of an amphiphilic diynic compound bearing an anionic or cationic group; optionally an intermediate coating of a cationic or anionic polymer; and a final coating of a porphyrin derivative which is either an anionic porphyrin or a cationic porphyrin, the coatings being linked to each other by electrostatic interactions. The present invention relates also to a method to prepare such an assembly and to its use as a photocatalyst, especially in a water medium, in particular in oxidation reactions, and for the production of singlet oxygen which is especially useful for disinfection or photodynamic therapy (PDT).

A sulfur-modified iron-nitrogen-carbon catalyst and its preparation and application. The present application relates to a preparation method of a series of sulfur-doped iron-nitrogen-carbon catalysts with high catalytic activity obtained by changing the addition amount of thiourea in the catalyst synthesis process and its application. Even under the water quality conditions containing a series of high-concentration inorganic anion humic acid, the catalyst can still achieve high-efficiency degradation of hydroxybenzoic acid. The sulfur atom doping plays a very important role in improving the activity of the main catalytically active site Fe-N4 activated persulfate, forming a catalytic reaction system dominated by singlet oxygen active groups, and realizing selective degradation of organic pollutants with different molecular structures, not only meeting the requirements of high catalytic activity, high stability and high adaptability of the catalyst, but also providing an effective preparation method for improving the catalytic activity of the traditional Fe-N4 structure site, which has good prospects in the application field of degrading organic wastewater containing a large amount of complex matrix.

This invention discloses a tandem-responsive self-assembled molecular probe and its applications. The HPO-CYFF-TPP of this invention is converted to HO-CYFF-TPP under the dephosphorylation of overexpressed ALP, restoring the intramolecular charge transfer effect. It then self-assembles into nanoparticles in situ through π-π stacking, exhibiting fluorescence signal quenching and photoacoustic signal enhancement at low viscosity. Upon laser irradiation, the NPs generate a large amount of singlet oxygen in the mitochondria, thereby achieving efficient photodynamic therapy (PDT) and leading to increased viscosity. At high viscosity, due to the suppression of the distorted intramolecular charge transfer effect of HO-CYFF-TPP, the NPs activate the FL signal with a high signal-to-noise ratio and further enhance the PA signal. Therefore, the HPO-CYFF-TPP of this invention can achieve efficient PDT and enable real-time therapeutic effect assessment through FL / PA signals.

The invention relates to the technical field of biosensing, and discloses a pH / viscosity double-lock activated afterglow luminescent small molecule probe as well as a preparation method and application thereof. The structural formula of the afterglow luminescent small-molecule probe is shown in the specification. A rhodamine light-emitting unit and an afterglow light-emitting matrix unit SO are covalently connected through a chemical bond. The luminescent mechanism is as follows: under illumination, molecules generate singlet oxygen to oxidize and activate adjacent SO units, so that active oxygen mediated afterglow luminescence is generated. The afterglow luminescent small-molecule probe has a double-lock activation characteristic, that is, a strong afterglow signal can be generated only when a subacid environment and a high-viscosity condition are met at the same time. And the signal is weak under a single condition or a normal physiological environment. The probe provided by the invention has excellent environmental specificity and high signal-to-noise ratio imaging capability, and provides a powerful tool for realizing accurate imaging in a complex biological system.

The invention relates to a preparation method of a heavy-atom-free photosensitizer based on a BODIPY dye, the photosensitizer comprises a thiocarbamate light cage, not only can generate singlet oxygen (1O2) under red light irradiation, but also can release carbonyl sulfide (COS), and generates hydrogen sulfide (H2S) under physiological conditions through carbonic anhydrase catalysis. By reasonably adjusting the molecular structure, the singlet oxygen quantum yield and hydrogen sulfide release efficiency of the photosensitizer are remarkably improved. The method is the first case which is reported at present and can simultaneously activate and release the organic optical functional micromolecules of H2S and 1O2 through a single beam of red light. The strategy effectively solves the problem of dependence on oxygen in type II photodynamic therapy (PDT), and further effectively improves the effect of PDT hypoxic tumors. In in-vitro and in-vivo experiments, hydrogen sulfide gas and photodynamic synergic treatment trigger pyroptosis of cells, promote maturation of dendritic cells and stimulate antitumor immune response. Therefore, the invention provides a synergistic treatment strategy combining gas, photodynamic and immunotherapy, and has a remarkable effect in the aspect of hypoxic tumor treatment. The photosensitizer material disclosed by the invention is simple to prepare and low in cost, has a wide application prospect, and particularly provides a solution with huge potential for cancer treatment in the field of biomedicine.

The invention belongs to the technical field of food packaging materials and bacteriostatic packaging films, and discloses an active packaging film capable of generating singlet oxygen bacteriostasis based on light driving, a preparation method and application of the active packaging film in fresh keeping of fruits, vegetables and edible mushrooms, and the active packaging film comprises the following steps: S1, obtaining a chitosan film solution A for later use; s2, obtaining a polyvinyl alcohol membrane solution B for later use; s3, obtaining a polyvinyl alcohol / chitosan composite membrane solution D based on food-grade nano silicon dioxide loaded sodium copper chlorophyllin; s4, preparing the bacteriostatic active packaging film, and using the bacteriostatic active packaging film in combination with blue-violet light. The antibacterial film disclosed by the invention has the advantages of high barrier property, ultraviolet-resistant optical property, strong and flexible mechanical property, good thermal stability, biodegradability and antibacterial property of CD-ROM movable product singlet oxygen (1O2). The packaging film can be used as a bio-based active package, can reduce the environmental pollution of a traditional petroleum-based packaging film, can prolong the shelf life of fruits, vegetables and edible mushrooms, and has the dual effects of environmental protection, bacteriostasis and preservation.

The invention discloses a preparation method and application of a Br and N co-doped cobalt-based monatomic catalyst, and relates to the technical field of preparation of catalytic materials. A zeolite imidazole framework ZnCo-ZIF is selected as a precursor and is pyrolyzed, NH4Br is adopted as a nitrogen source and a bromine source to optimize the prepared conventional cobalt-based monatomic catalyst, and a chemical vapor deposition technical synthesis method is utilized to modify the catalyst, so that the cobalt-based monatomic catalyst is prepared. Through the synergistic effect of short-range regulation and control of a first shell coordination microenvironment of Co and long-range regulation and control of an induced electron effect in a carbon matrix, an electronic structure of a Co site is effectively regulated and controlled, and the intrinsic catalytic activity of the catalyst is improved, so that generation of singlet oxygen and degradation of pollutants are enhanced. Compared with a conventional cobalt-based monatomic catalyst, the prepared catalyst has the advantage that the catalytic performance is remarkably improved. Meanwhile, the prepared catalyst is mild in reaction condition, has excellent acid and alkali resistance, good anti-interference capability and excellent durability, and has wide practical application potential.

Disclosed are novel phenalene-l-one photosensitizers capable of generating singlet oxygen, compositions comprising at least one novel phenalene-l-one photosensitizer, and uses of the novel phenalene-l-one photosensitizers. The compositions are bleaching compositions, comprising at least one phenalene-l-one photosensitizer, at least one persulfate, at least one alkalizing agent and at least one peroxide source. (Formula I)