468 results about "Singlet oxygen" patented technology

The invention provides a preparation method of a Fenton-like catalytic material for selectively removing phenolic pollutants, the Fenton-like catalytic material and application of the Fenton-like catalytic material, and belongs to the technical field of water treatment.The preparation method comprises the steps that light MgO is added into a copper nitrate solution to be stirred for a reaction, obtained precipitates are filtered, washed and dried, and copper hydroxide nanoparticles are obtained; dispersing the copper hydroxide nanoparticles in a cerium nitrate solution for hydrothermal reaction, and filtering, washing and drying the obtained precipitate to obtain a Ce (at) Cu (OH) 2-IE intermediate; and calcining the Ce (at) Cu (OH) 2-IE intermediate to obtain the Fenton-like catalytic material CC-IE. The prepared catalytic material can efficiently activate PMS to generate singlet oxygen, utilizes an oxidative polymerization mechanism to stably remove organic phenol pollutants in water, and has the advantages of high electron utilization rate, selective oxidation, non-free radical path degradation and high TOC removal rate.

The invention discloses a preparation method and application of a manganese-based amino acid coordination polymer, and belongs to the technical field of nano-enzymes and nano-drugs. Divalent manganese salt, histidine and other amino acids are subjected to a co-precipitation reaction to prepare the manganese-based amino acid coordination polymer, and the polymer is of a nanoparticle structure, small in size and high in stability, has enzyme-like activity, catalyzes hydrogen peroxide to generate high-toxicity hydroxyl free radicals and is used for specifically killing tumor cells. The catalyst has the capability of catalytically generating singlet oxygen in the presence of hydrogen peroxide. Meanwhile, the manganese-based amino acid complex has glutathione oxidase-like activity, consumes glutathione to overcome the resistance of tumors to oxidative stress, improves the chemical kinetic curative effect, and has anti-tumor application potential.

The invention discloses a nano-carbon supported ruthenium cluster nano-catalyst as well as a preparation method and application thereof. According to the present invention, the synthesis process of the catalyst is simple and easy to perform, the reaction process is controllable, the nanocarbon with characteristics of rich defects and large specific surface area is adopted as the carrier, the ruthenium cluster is loaded on the surface of the nanocarbon, and the nanometer catalyst with characteristics of high specific surface area and high atom utilization rate is synthesized. The catalyst can catalyze persulfate (PDS) to generate products with strong oxidation activity, namely sulfate free radicals (SO4.-), hydroxyl free radicals (. OH) and singlet oxygen (1O2), so that effective inactivation of bacteria is realized. In the invention, the reaction of activating the persulfate to disinfect by the catalyst is carried out at room temperature under neutral conditions, and in a mild reaction environment, the nanocarbon-loaded ruthenium cluster nanocatalyst shows good capability of catalyzing the persulfate to inactivate bacteria, and has huge potential in practical application of water disinfection.

The invention discloses a targeted nano delivery system based on curcumin (Cur) and near-infrared aggregation-induced emission (AIE) molecule BDTA and application of the targeted nano delivery system in treatment of glioblastoma (GBM), and belongs to the field of biomedicine. The nano platform is composed of nanoparticles (MPMs (at) Cur-BDTA NPs) modified by a macrophage membrane, curcumin and BDTA are combined by adopting a coprecipitation method, and the targeting property of the nano platform to tumors is enhanced through modification of the macrophage membrane. The nanometer platform combines the functions of photo-thermal therapy (PTT), photodynamic therapy (PDT) and chemotherapy, and can achieve multiple treatment effects. The curcumin improves PTT sensitivity by down-regulating expression of heat shock protein HSP-70 in the platform, and effectively improves photothermal conversion efficiency (87.6%) and singlet oxygen generation amount (1.7 times higher than that of a control group) through a Foster resonance energy transfer (FRET) mechanism. In a glioblastoma in-vitro experiment, the nano platform shows a synergistic treatment effect of photo-thermal, photodynamic and chemotherapy. The invention provides an intelligent treatment platform integrating photo-thermal treatment, photodynamic treatment and chemotherapy, and provides an efficient and safe innovative treatment strategy for precise treatment of glioblastoma.

The invention relates to the technical field of lithium ion batteries, in particular to a modified positive electrode material, a preparation method and application thereof, a positive electrode plate and an all-solid-state battery. The modified positive electrode material comprises a positive electrode material matrix, a singlet oxygen quencher serving as an inner coating layer and a conductive polymer serving as an outer coating layer, wherein the quenching rate constant of the singlet oxygen quencher is greater than or equal to 1 * 10 < 6 > M <-1 >. S <-1 >. The modified positive electrode material provided by the invention adopts double-layer coating, so that the problem of interface stability caused by oxygen evolution on the surface of the positive electrode material is solved; meanwhile, the modified positive electrode material is applied to the lithium ion battery, especially an all-solid-state battery, so that the cycling stability and safety of the lithium ion battery at high temperature and high pressure are improved.

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.

Method and apparatus for directing pulsed light beams at an in vivo treatment site to create thermoelastic expansion of tissue which generates ultrasonic pulse waves in the mega hertz range. One or more photosensitizers are applied to the treatment site. Further, the ultrasonic pulse waves either singly, or in combination with the pulsed light waves cause the activation of the photosensitizers to generate singlet oxygen at the treatment site.

The invention discloses a preparation method and application of multifunctional antibacterial gel, and relates to the technical field of biomedical injectable hydrogel materials with antibacterial activity. The cationic guar gum (CG) is used as a cross-linked network and is loaded with a water-soluble Fe (II)-based metal organic metal cage (Fe-1SO4), and through in-situ chemical dynamic therapy (CDT) and photodynamic therapy (PDT) induced under irradiation of 660 nm laser, rapid healing of surface wounds is promoted through synergistic antibiosis. Fe-1SO4 is a water-soluble metal cage which takes Fe (II) as a metal node and 5, 10, 15, 20-tetra (4-aminophenyl)-21H, 23h-porphyrin (TAPP) as an organic ligand, and can be quickly degraded within 5 days in a biological environment. According to the present invention, with the application of the fenton-like reaction in the preparation of the antibacterial agent, the obvious PDT effect can be provided under the irradiation of 660 nm laser so as to generate a large amount of singlet oxygen (1O2), and the fenton-like reaction can convert H2O2 generated by bacterial infection into toxic hydroxyl radicals (OH) in situ, such that the excellent antibacterial activity can be provided in vivo and in vitro, and the wound healing can be promoted. The invention provides a simple strategy for the design of the rapidly degradable antibacterial hydrogel dressing, and is an important step for the clinical application of biological materials.

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 wastewater treatment, and provides a method for realizing continuous degradation of pollutants under a low dosage based on a self-assembly induced carbon confinement material, which comprises the following steps: adding peracetic acid and a carbon confinement material into wastewater containing organic pollutants, treating the wastewater under a stirring condition, and in the wastewater treatment process, adding the peracetic acid and the carbon confinement material into the wastewater, the carbon confinement material activates peracetic acid to generate hydroxyl free radicals, organic free radicals, singlet oxygen and Co (IV) to degrade organic pollutants in the wastewater; the carbon confinement material is composed of a cobalt material and a nitrogen-doped carbon material coating the cobalt material, the cobalt material is composed of Co and CoO, and the carbon confinement material is nanoparticles with a core-shell structure. According to the invention, the high-efficiency utilization of the oxidizing agent peracetic acid can be realized under the condition of low-carbon confinement material dosage, the continuous degradation of micropollutants can be mediated, and the treatment cost of wastewater containing organic pollutants can be reduced.

The invention relates to the technical field of mineral materials and nano-enzyme catalysis, in particular to an iron-containing layered silicate mineral nano-enzyme as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out ball milling on the iron-containing layered silicate mineral, carrying out centrifugal washing, and drying to obtain the iron-containing layered silicate mineral nano-enzyme. According to the method, silicate minerals with a layered structure and rich iron content are adopted as raw materials, the ball-milled layered silicate mineral nano-enzyme is successfully prepared through a ball milling method, the crystallinity of the minerals is reduced, the surface acidity of the minerals is improved, and low-spin iron is generated, so that the affinity of the ball-milled minerals to H2O2 is enhanced; h2O2 is catalyzed to generate singlet oxygen and superoxide free radicals, so that the peroxidase-like activity of the ball-milled minerals is improved. The enzyme-like activity is improved by 10 times, high catalytic activity can still be kept under the neutral condition, and the method can be used for colorimetric sensing and antibacterial application of small biological molecules such as glucose, hydrogen peroxide and glutathione.

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 the technical field of sewage treatment, in particular to a composition for degrading triazole bactericides and application of the composition. The invention provides a composition for degrading triazole bactericides. The composition comprises persulfate and a catalyst, the catalyst takes foamed nickel as a carrier and is loaded with a cobalt-nickel layered bimetallic oxide. The cobalt-nickel layered bimetallic oxide is rich in oxygen vacancies, and has a larger specific surface area, higher stability and a higher oxidation reduction rate. In the process of activating sulfate by the cobalt-nickel layered bimetallic oxide, a large amount of free radical sulfate free radical # imgabs0 # superoxide free radical # imgabs1 # and non-free radical singlet oxygen (1O2) are generated, and triazole bactericides are synergistically degraded based on a free radical path and a non-free radical path.

The invention provides a water treatment method for generating singlet oxygen based on electron beam irradiation, belongs to the technical field of water treatment, and aims to provide a universal singlet oxygen generation method for a water treatment process, the method comprises the following steps: adding a metal salt into sewage to be treated, and uniformly stirring to obtain a mixed solution; wherein the metal salt comprises reducing metal ions; continuously aerating air into the mixed solution, so that the mixed solution is rich in oxygen; and carrying out electron beam irradiation on the mixed solution rich in oxygen, so that the reducing metal ions cooperate with the electron beam irradiation to activate the oxygen in the mixed solution to generate singlet oxygen, and removing new pollutants in the sewage to be treated.

The invention discloses an application of aminated MIL-101 (Fe) in piezoelectric catalytic degradation of ciprofloxacin, which comprises the following steps: adding aminated MIL-101 (Fe) into water containing ciprofloxacin, stirring to enable the adsorption of a ciprofloxacin solution to reach equilibrium, and then carrying out ultrasonic treatment. The process is simple, the prepared NH2-MIL-101 (Fe) catalyst has obvious piezoelectric catalysis performance, good stability and excellent catalysis performance, the separation efficiency of photo-induced electron hole pairs can be greatly improved, H2O2 does not need to be additionally added into the catalyst, hydrogen peroxide can be automatically generated through ultrasonic treatment under the piezoelectric catalysis condition, and the catalyst is suitable for industrial production. Then hydrogen peroxide generates singlet oxygen to degrade pollutants, the degradation rate of CIP reaches up to 86.11%, and the cytotoxicity of a degradation product is reduced. In addition, the catalyst disclosed by the invention can be recycled after reaction and is easy to recover, and is a green, non-toxic and pollution-free piezoelectric catalyst.

The invention relates to the technical field of electrochemistry, in particular to a foam titanium-based iodine iron double-monatomic electrode, preparation thereof and application of the foam titanium-based iodine iron double-monatomic electrode in preparation of singlet oxygen. The configuration of the foamed titanium-based iodine-iron double-monatomic electrode provided by the invention has a double-monatomic synergistic effect, iodine monatomic can be utilized to dissociate water molecules to release atomic hydrogen, and the atomic hydrogen is used for reducing and activating oxygen adsorbed by iron sites, so that active sites are fully utilized, the atom utilization efficiency and reaction activity are improved, and competitive side reactions are reduced; according to the foamed titanium-based iodine iron double-monatomic electrode material, the singlet oxygen electrosynthesis rate is remarkably increased, the use scene of singlet oxygen in-situ utilization is expanded, and the foamed titanium-based iodine iron double-monatomic electrode material has excellent performance in the fields of degradation of aromatic organic pollutants in water, removal of antibiotic resistance genes, purification of pollutants such as pathogenic viruses in air and the like.

The invention discloses a method for degrading organic pollutants by utilizing self-decomposition reaction of decoupling peroxide, which is used for efficiently activating hydrogen peroxide through an electrochemical process to realize efficient degradation of the organic pollutants in water. The method is based on an electrolysis system, and an anode and a cathode have a synergistic effect: the anode is subjected to a hydrogen peroxide oxidation reaction, and superoxide free radicals (. O2 <->) and singlet oxygen (1O2) are generated in the process of electrooxidizing hydrogen peroxide to generate oxygen; the cathode is subjected to hydrogen peroxide reduction reaction, and hydroxyl radicals (. OH) are generated in the process of electrically reducing hydrogen peroxide to generate water. Under the driving of an external power supply, the method decouples a hydrogen peroxide self-decomposition path, promotes hydrogen peroxide to generate reactive oxygen species (ROS) with strong oxidizing property and non-selectivity through an electrochemical reaction path, and further efficiently degrades organic pollutants. The method has the advantages of low energy consumption, environmental friendliness, sensitive operation and high degradation efficiency.

The invention discloses a CoNiFc-MOF catalyst and a preparation method and application thereof, and belongs to the technical field of catalysts, the preparation method comprises the following steps: carrying out solvothermal reaction on a mixed solution of Fc (COOH) 2, CoCl2. 6H2O and NiCl2. 6H2O, and after the reaction is finished, cooling, washing and drying to obtain the CoNiFc-MOF catalyst. The invention also discloses the CoNiFc-MOF catalyst prepared by the preparation method and application of the CoNiFc-MOF catalyst in removal of organic pollutants in wastewater. According to the catalyst provided by the invention, extra energy and chemicals are not needed to generate active species, and singlet oxygen and superoxide free radicals are generated only by PDS and the catalyst. Besides, a non-free radical path of electron transfer exists for a typical endocrine disrupter bisphenol A (BPA) removal mechanism, and the catalyst has the advantages of being more economical and simpler and can be widely applied.

The invention belongs to the field of biomedical luminescent composite materials, and particularly relates to a rare earth up-conversion nanocrystalline particle-hydrogen bond organic framework composite material and a preparation method thereof.The rare earth up-conversion nanocrystalline particle NaGdF4: Yb / Er serves as a core of the composite material, a hydrogen bond organic framework serves as a shell of the composite material, and the rare earth up-conversion nanocrystalline particle-hydrogen bond organic framework composite material is prepared. The advantages of the rare earth up-conversion nanocrystal particles and the hydrogen bond organic framework are ingeniously combined, the rare earth up-conversion nanocrystal particles and the hydrogen bond organic framework form a synergistic system, active oxygen is generated under excitation of 980 nm near-infrared light during photodynamic therapy, meanwhile, generation of the active oxygen is more efficient, the killing efficiency on tumor cells is improved, and the application prospect is wide. The rare earth up-conversion nanocrystal particle is suitable for deep tumor (such as brain glioma) treatment, meanwhile, the porphyrin core of TCPP is matched with the visible light emission spectrum of the rare earth up-conversion nanocrystal particle, efficient energy transfer is achieved, and the singlet oxygen yield is remarkably higher than that of a traditional PDT material.

The invention belongs to the field of nano material preparation, and particularly relates to a preparation method and application of seaweed biomass derived manganese / nitrogen doped carbon composite nano enzyme. The low-cost manganese nanoparticle / seaweed biomass derived nitrogen-doped carbon composite nano-enzyme is prepared by taking seaweed biomass as a raw material through an impregnation-pyrolysis method. The nano-enzyme has high-efficiency enzyme-like activities such as peroxidase-like activity, glutathione oxide enzyme-like activity, singlet oxygen generation catalysis capability and the like, and shows application prospects in the antibacterial and anti-tumor fields.

The invention belongs to the technical field of singlet oxygen generation, and discloses an efficient singlet oxygen generation photosensitizer based on nitrogenous aliphatic ring size regulation and a theoretical calculation design method. A donor is introduced to the meso site of stilbene-BODIPY, the ring tension of the stilbene-BODIPY is effectively changed by adjusting the size of a nitrogen-containing ring, and the larger the ring tension is, the more unstable the molecule is, so that the oxidation potential of the donor is reduced, and the electron donating ability of the stilbene-BODIPY is further improved. The donor with stronger electron donating ability can obviously improve the intersystem crossing efficiency of photosensitizer molecules, thereby improving the quantum yield of singlet oxygen. According to the donor designed by the invention, the electron donating capability of the donor can be enhanced by adjusting the size of the nitrogen-containing aliphatic ring, the spin-orbit coupling is increased, and intersystem crossing is promoted. The calculation result shows that the photosensitizer has lower oxidation potential, smaller single triplet state energy gap, larger spin-orbit coupling coefficient and higher intersystem crossing rate, and shows more excellent potential in the field of singlet oxygen generation.

The invention discloses a nano assembly capable of automatically releasing CO as well as a preparation method and application of the nano assembly, and belongs to the technical field of biomedical materials. The nano assembly comprises a co-assembly product prepared from a system comprising the following components through a hydrophilic and hydrophobic self-assembly forming method; (1) an amphiphilic block polymer A for a CO donor, which has a chemical structure as shown in formula (I) or (II) in the application; and (2) an amphiphilic block polymer B for a singlet oxygen donor, wherein the amphiphilic block polymer B has a chemical structure as shown in a formula (III) in the application. The CO donor and the singlet oxygen donor capable of releasing singlet oxygen at the temperature close to the human body temperature are combined into a whole, so that singlet oxygen can be released through the singlet oxygen donor in the human body to oxidize the CO donor to release CO, and triggering dependence on external stimulation such as illumination / ultrasonic waves is avoided; the spontaneous release of CO in a normal oxygen, hypoxia and dark human body environment is effectively achieved.

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 discloses a photosensitizer for endogenous hydrogen sulfide activation and visible light excitation as well as a preparation method and application thereof, and relates to the technical field of medical photosensitizers. According to the photosensitizer provided by the invention, BA and NIS react to obtain a BODIPY compound I2BA substituted by double atoms I, so that the intersystem crossing capability is enhanced, and the yield of active oxygen is increased; a target photosensitizer is obtained by introducing a tetraazobenzene ring Cyclone into the para-position of a benzene ring and combining copper ions Cu < 2 + >. The prepared photosensitizer has good light stability and water solubility, can be activated by endogenous hydrogen sulfide in cancer cells, can generate singlet oxygen (1O2) under the irradiation of green light (520 nm), shows excellent photodynamic activity to tumor cells and low dark toxicity to normal cells, has a high photodynamic activity index (PI value), and can be used as a photosensitizer for cancer cells. The compound is successfully used for photodynamic inhibition and elimination of tumors on HCT116 tumor-bearing mice.

The invention discloses a Fe-N-C catalyst and application thereof in degradation of perfluorinated and polyfluoroalkyl substances, and belongs to the technical field of water treatment. The preparation method comprises the following steps: taking nitrogen-doped carbon derived from pine cones as a substrate, dissolving aminated pine cones, FeCl36H2O, sodium acetate and polyethylene glycol in ethylene glycol, reacting at 200 DEG C for 10 hours, putting in an inert gas atmosphere, and calcining at 900 DEG C for 2 hours; the Fe-N-C catalyst which simultaneously contains Fe nano particles (Fe NPs) and Fe-N single atoms (Fe SAs) and has different sizes and double sites is prepared. The catalyst and PMS are mixed and then added into water, and perfluoro and polyfluoroalkyl substances in the water can be degraded; the catalyst can activate PMS to promote formation of a non-free radical pathway, depends on a degradation mechanism of Fe (IV) = O and singlet oxygen (O), the degradation rate of PFOA within 2 hours reaches 90.5%, and the catalyst also shows relatively strong tolerance in different natural water bodies; a key thought is provided for designing the efficient catalyst, and a new technical direction is expected to be provided for environmental treatment of persistent organic pollutants such as PFOA.

The present invention belongs to the field of biomedicine, and specifically relates to a light-controlled release of ONOO － Compounds and preparation methods and applications thereof. The present invention provides ONOO ‑ The donor is composed of a diphenyl phenothiazine analogue and arginine covalently linked. Its strong conjugation effect makes it extremely photoresponsive. The polymer has near-infrared light emission and excellent reactive oxygen and reactive nitrogen generation capabilities. When L6 is irradiated with a 660nm laser, it will produce superoxide anions and singlet oxygen. Singlet oxygen oxidizes the guanidine group of arginine to produce NO and ·O2 ‑ and NO to form peroxynitrite (ONOO ‑ ), achieving the goal of highly effective tumor cell killing. Therefore, this compound is a potentially highly effective photosensitizer for tumor killing. Compared to conventional photosensitizers, this killing method has stronger oxidative and nitrative cell damage capabilities, and its development cycle is shorter than that of other photosensitizers, thus possessing great potential application value in clinical treatment.

The invention relates to a monatomic nanofiber catalytic membrane with gradient distribution of catalysts as well as a preparation method and application of the monatomic nanofiber catalytic membrane, and belongs to the technical field of membrane separation-catalytic coupling and sewage treatment. The technical problems that in the prior art, a catalytic membrane cannot effectively treat high-salinity wastewater, and the utilization rate of a catalyst and active oxygen is low are solved. The monatomic nanofiber catalytic membrane comprises a nanofiber base membrane and a metal-C3N4 monatomic catalyst which is distributed on the surface of the nanofiber base membrane in a gradient manner. The preparation method comprises the following steps: firstly, synthesizing a metal-C3N4 monatomic catalyst; then preparing spinning solutions of metal-C3N4 monatomic catalysts with different concentrations; finally, gradient spinning, hole forming and drying are conducted, the monatomic nanofiber catalytic membrane is obtained, stable loading of a monatomic catalyst in the catalytic membrane is achieved, gradient distribution of the singlet oxygen concentration of a hole channel is achieved, and the catalytic degradation efficiency of the nanofiber catalytic membrane on organic pollutant molecules is greatly improved.

The invention discloses a preparation method of an inorganic piezoelectric catalytic membrane and application of the inorganic piezoelectric catalytic membrane in water treatment by coupling an advanced oxidation technology, and belongs to the technical field of environmental functional materials and water treatment. Technical breakthrough is achieved through a synergistic mechanism of an inorganic piezoelectric material and an advanced oxidation technology, the inorganic piezoelectric catalytic membrane is prepared by taking the piezoelectric material as a core piezoelectric component through ball-milling mixing, dry-pressing forming and high-temperature calcination processes, a multi-stage pore channel structure (the pore diameter is 50-100 nm) is formed, and a piezoelectric electric field larger than or equal to 0.5 V is generated under dynamic mechanical energy; the electric field is used for directionally activating the oxidant to generate high-selectivity singlet oxygen (1O2) by adjusting an electron structure on the surface of the catalyst, and the selectivity of the singlet oxygen reaches 95% or above; the mass transfer efficiency is remarkably improved through the synergistic effect of the membrane confinement effect and the piezoelectric micro-current, efficient removal of refractory pollutants such as sulfamethoxazole and bisphenol A is achieved (the degradation rate within 30 minutes is larger than or equal to 99%), and the self-cleaning function is achieved (the flux recovery rate is larger than or equal to 98%).

The invention discloses a preparation method and application of a monatomic catalyst for activating peroxymonosulfate. The monatomic catalyst provided by the invention comprises a carrier and cobalt monatomic loaded on the carrier, the carrier is an oxygen-doped graphite phase carbon nitride nanosheet; the cobalt single atoms exist on the carrier in a well dispersed single atom structure. The monatomic catalyst disclosed by the invention has excellent capability of degrading organic pollutants, takes singlet oxygen as a key active oxygen species, and shows high selectivity, wide pH tolerance and adaptability to various complex water matrixes. Meanwhile, the monatomic catalyst disclosed by the invention has the potential of sustainable water purification application, so that the operation cost of a peroxymonosulfate activation technology is reduced, and the problem of ecological pollution caused by the use of a large amount of peroxymonosulfate is avoided.

The invention is suitable for the technical field of sonodynamic antibacterial materials, and provides a preparation method of a polyphenol nanodot sonosensitizer and application of the polyphenol nanodot sonosensitizer in sonodynamic antibiosis. The method comprises the following steps: dissolving tannic acid (TA) in deionized water, stirring at room temperature until the tannic acid is completely dissolved, carrying out oxidative polymerization reaction on the dissolved solution, assembling the tannic acid through oxidative polymerization to obtain the polyphenol nanodot sound-sensitive agent (TANDs), cooling after the reaction is finished, collecting the product, filtering, transferring the filtrate into a dialysis bag for dialysis, changing water once every 6 hours, and drying to obtain the polyphenol nanodot sound-sensitive agent (TANDs). Freeze-drying the dialyzed solution into solid powder, and dispersing the freeze-dried solid powder into deionized water for later use; tA is used as an element, the TANDs with the sound-sensitive property are prepared through simple oxidative polymerization reaction self-assembly, the TANDs show excellent singlet oxygen (1O2) generation capacity under the ultrasonic (US) condition, and the TANDs also show excellent antibacterial performance in the actual antibacterial application process.