131 results about "Peroxymonosulfuric acid" 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 belongs to the technical field of environmental catalytic materials and pollutant control, and particularly relates to a Ni-coated NiS < 2 >-coated MoS < x > / NF composite catalyst and a preparation method and application thereof. According to the preparation method of the Ni-coated NiS2-coated MoSx / NF composite catalyst provided by the invention, the Ni-coated NiS2-coated MoSx / NF composite catalyst with a self-supported metal / crystalline / amorphous heterojunction is constructed by virtue of a collaborative strategy of directional self-assembly and internal Ni source and water dispersion, and meanwhile, the activation efficiency of peroxymonosulfate (PMS) can be remarkably improved by combining an Ni-Mo bimetal active center, so that the activation efficiency of the Ni-coated NiS2-coated MoSx / NF composite catalyst is improved. The problems that an existing catalyst is limited in active site and poor in structural stability are solved, the excellent capacity of activating PMS to remove antibiotics is shown, therefore, efficient degradation of antibiotic pollutants is achieved, and the catalyst has wide application prospects in antibiotic wastewater treatment.

The invention provides a method for degrading a perfluoroalkyl compound by activating peroxymonosulfate based on a graphite electrode. Comprising the following steps: step 1, pretreatment of a graphite rod electrode: soaking the graphite rod electrode in a sulfuric acid solution to remove surface impurities; step 2, preparing an electrolyte: preparing the electrolyte containing a perfluoroalkyl compound to be degraded, a background supporting electrolyte and peroxymonosulfate (PMS), and fully stirring to ensure uniform distribution; and step 3, inserting the pretreated graphite rod electrode into electrolyte in an electrolytic bath, adjusting current and voltage, and carrying out electrolysis under the condition of solution stirring. According to the method, the feasibility of activating the PMS to degrade the perfluoroalkyl compound by the low-oxygen-evolution-potential electrode is proved for the first time, and the cognitive limitation of the traditional technology is broken through; the prior art generally depends on a high oxygen evolution potential electrode (such as a BDD electrode, and the oxygen evolution potential is larger than 2.0 V / SHE) to activate PMS so as to degrade perfluoroalkyl compounds.

The invention discloses a zinc-sulfur co-doped ZIF-67 derivative composite material as well as a preparation method and application thereof, and belongs to the technical field of advanced oxidation. The composite material is prepared through a coordination-substitution-calcination integrated process. The preparation method comprises the following steps: firstly, mixing a cobalt source and an organic ligand in methanol, and introducing a sulfur source to form a cobalt-based precursor; and drying, grinding with a zinc source, and calcining in an inert atmosphere. According to the method, stable cobalt active sites are replaced by isocrystals of zinc, sulfur doping promotes cobalt and peroxymonosulfate to form a weak oxidizing intermediate, and efficient and high-selectivity degradation of organic pollutants is achieved under the condition that a strong free radical path is not needed. The material is stable in structure and high in water quality interference resistance, is suitable for catalyzing peroxymonosulfate to degrade organic pollutants in a water body, and particularly has remarkable advantages in a complex water body.

The present disclosure provides tooth whitening oral care compositions comprising potassium peroxymonosulfate having improved stability and methods of using the same.

The invention discloses a biomass carbon loaded manganese dioxide catalyst as well as a preparation method and application thereof. The biomass carbon loaded manganese dioxide catalyst comprises a carrier and MnO2 loaded on the surface of the carrier, and the carrier is carbonized biomass obtained by performing alkali treatment and hydrogen peroxide treatment on biomass and then carbonizing the biomass in an inert atmosphere. The supported catalyst prepared by the method has proper valence and morphology, a MnO2 mixed phase appears, more oxygen vacancies are generated, generation of free radicals in the activation process of peroxymonosulfate (PMS) is facilitated, PMS can be effectively activated to remove organic pollutants, and the activation efficiency of MnO2 on PMS and the operation stability of MnO2 in a packed column are greatly improved. Compared with a traditional method for adjusting the oxygen vacancy of MnO2, the method for loading the biochar is relatively controllable, simple in mode and low in cost.

The invention relates to a method for treating wastewater by activating peroxymonosulfate through cobalt nanoparticle encapsulated carbon nanotubes, which comprises the following steps: adding a nanoparticle encapsulated carbon nanotube catalyst with the concentration of 10-200mg / L into wastewater, and stirring; after uniformly stirring, adding peroxymonosulfate with the concentration of 0.1-2.0 mmol / L to generate hydroxyl radicals to degrade organic pollutants in the wastewater; and after the wastewater is treated, recovering the nano-particle encapsulated carbon nanotube catalyst. According to the invention, the carbon nano tube provides a protection effect on the cobalt nano particles and plays a role in continuously and efficiently activating peroxymonosulfate to generate active species, so that the carbon nano tube has excellent recycling performance; meanwhile, in practical application, the commercial PES film loaded with the cobalt nanoparticle encapsulated carbon nanotube catalyst can be used for continuously and effectively removing organic pollutants.

The invention discloses a tetrathiomolybdate intercalated ternary iron-magnesium-zinc layered double hydroxide catalyst, a preparation method thereof and an application of the tetrathiomolybdate intercalated ternary iron-magnesium-zinc layered double hydroxide catalyst in degrading azo dyes by activating peroxymonosulfate. According to the method, a carbonate intercalated ternary LDH precursor is synthesized through a hydrothermal reaction, interlayer anions are replaced with nitrate and tetrathiomolybdate through ion exchange, and the target catalyst is obtained. In the catalyst, a unique Fe-Mg-Zn ternary metal laminate and a MoS < 2-> intercalation structure cooperatively construct a multi-active center, and MoS < 2-> is used as an electron donor to promote cyclic regeneration of Fe < 3 + > / Fe < 2 + >. The catalyst keeps ultrahigh activity in a wide range of pH (potential of hydrogen) of 3-9, can completely degrade 10 mg / L of acid orange 7 within 5 minutes, and is stable in structure and low in metal dissolution risk. The problems of low activity, slow Fe < 3 + > reduction, metal ion dissolution and the like under neutral and alkaline conditions in an advanced oxidation technology based on peroxymonosulfate are solved, and the method has important application value in the field of printing and dyeing wastewater treatment.

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 an iron-cobalt spinel oxide, which is prepared by the following steps: with ferric salt and cobalt salt as raw materials, dissolving the ferric salt, the cobalt salt and sodium acetate in an ethanol aqueous solution to obtain a precursor solution, carrying out hydrothermal treatment on the precursor solution, and washing and drying a reaction product to obtain the iron-cobalt spinel oxide. The iron-cobalt spinel type oxide is stable in crystal structure, the leaching rate of metal ions is remarkably reduced due to existence of metal-oxygen bonds, the recycling rate is increased, and meanwhile the risk of secondary pollution of water is reduced. In the process of degrading nitrogen-containing organic wastewater by an advanced oxidation technology for generating sulfate free radicals based on peroxymonosulfate, the iron-cobalt spinel type oxide has good catalytic performance, and can basically complete degradation of multi-nitrogen organic pollutants in water; and the method has relatively strong capability of resisting interference of inorganic ions and organic matters, and has relatively great application potential in actual wastewater treatment. The invention also discloses a method for degrading the multi-nitrogen explosive wastewater by using the ferrocobalt spinel type oxide.

The application discloses a preparation method and application of nitrogen-doped oxygen-rich hierarchical porous carbon, and adopts a one-step co-activation method to prepare the nitrogen-doped oxygen-rich hierarchical porous carbon, which is simple in process and low in energy consumption. The structure and surface chemical performance of the prepared nitrogen-doped oxygen-rich hierarchical porous carbon catalyst are easy to control. The prepared TNS-X material has a large specific surface area and a developed pore structure, which is beneficial to exposure of catalytic sites and diffusion of reactants. Through ammonia and water vapor co-activation, efficient doping of nitrogen atoms and oxygen atoms is realized, the number of catalytic sites is increased, and the catalytic activity is improved. The TNS-800 material exhibits high catalytic performance in a peroxymonosulfate (PMS) activation process, and can completely remove organic pollutants such as acetylaminophenol in a short time.

The present disclosure provides tooth whitening oral care compositions comprising potassium peroxymonosulfate having improved stability and methods of using the same.

The invention discloses a device and a method for synchronously removing heavy metals and organic matters in industrial wastewater, and particularly relates to the technical field of water treatment.A complexing agent is used for promoting manganese dioxide on the surface of manganese sand to activate peroxymonosulfate to generate high-activity sulfate free radicals and persulfate free radicals, so that the oxidative degradation efficiency of organic pollutants is improved; meanwhile, residual manganese dioxide formed in the reaction process has good heavy metal adsorption performance, and the mass transfer and reaction rate of pollutants is enhanced by combining the dynamic fluidized contact effect of manganese sand particles in the fluidized bed reactor. According to the process provided by the invention, various organic pollutants and heavy metal ions in the wastewater can be synchronously and efficiently removed under a mild condition, the problems of low treatment efficiency, complex process flow, secondary pollution and the like in a traditional method are avoided, and the process has a good application prospect and popularization value; the technical challenges of complex components and high treatment difficulty of industrial wastewater can be effectively handled.

The invention relates to the technical field of photocatalytic materials, in particular to a metal single atom loaded defect carbon nitride catalyst and a preparation method and application thereof. The method comprises the following steps: by taking melamine as a nitrogen source, soluble metal salt as a metal source and ethylenediaminetetraacetic acid as a chelating agent, carrying out freeze drying in a solvent system, calcining in a protective atmosphere, and carrying out thermal polymerization, so as to obtain the metal single atom loaded defective carbon nitride catalyst. The metal in the soluble metal salt is copper, iron or manganese. Precise anchoring and high dispersion of metal ions are achieved through complexing of ethylenediamine tetraacetic acid, a stable metal-N coordination structure is formed, metal agglomeration is avoided, a defect structure is constructed synchronously, and the metal monatomic loading capacity is 1 wt.%-7 wt.%. The catalyst can efficiently catalyze and activate peroxymonosulfate and rapidly degrade antibiotic pollutants such as tetracycline, has the advantages of being low in preparation cost, environmentally friendly, high in catalytic activity and high in stability, and is suitable for the field of water pollution remediation.

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.

The application discloses an electrode material based on MOF@COF / BC and application thereof in wastewater treatment and belongs to the technical field of wastewater treatment. The electrode material is prepared by the following method: NH2-MIL101(Fe), melamine and phthalocyanine molybdenum are dissolved in dimethyl sulfoxide, reaction is carried out at 160-200 DEG C for 10-14 h, the precipitate is collected after reaction, and washing, drying are carried out to prepare NH2-MIL101(Fe)@Mel-MoPc; the biochar and NH2-MIL101(Fe)@Mel-MoPc are mixed in deionized water, ultrasonic treatment is carried out for 8-12 min, stirring is carried out for 10-14 h, then the precipitate is collected by centrifugation, and washing, drying are carried out to prepare the electrode material. The application develops and designs a novel electrode material, which is used for electrocatalytic activation of peroxymonosulfate to degrade OFX wastewater, and the degradation efficiency of the OFX wastewater is greatly improved.

The invention relates to silkworm cocoon-shaped zinc silicate nano-particles and a preparation method and application thereof, and the preparation method of the silkworm cocoon-shaped zinc silicate nano-particles comprises the following steps: preparing a zinc salt aqueous solution; mixing the zinc salt aqueous solution with the tetraethyl silicate solution, and adjusting the pH value to 7.0 to obtain a mixed solution; carrying out a reaction on the mixed solution in a hydrothermal reaction at a temperature of 180-200 DEG C for 12-18 h to obtain a precipitate; and washing and drying the precipitate to obtain the silkworm cocoon-shaped zinc silicate nanoparticles. The invention further provides the silkworm cocoon-shaped zinc silicate nano-particles prepared by the preparation method of the silkworm cocoon-shaped zinc silicate nano-particles and application of the silkworm cocoon-shaped zinc silicate nano-particle activated peroxymonosulfate in degradation of tetracycline antibiotics. The defects in antibiotic wastewater treatment in the prior art are overcome, the prepared silkworm cocoon-shaped zinc silicate nanoparticles provide efficient and stable catalytic performance for peroxymonosulfate, and efficient removal of tetracycline antibiotics is achieved.

The invention belongs to the technical field of sewage advanced oxidation technology treatment, and particularly relates to a defluorination device and method for peroxymonosulfate and manganese ferrite synergistic dielectric barrier discharge. The method comprises the following steps: 1) preparing a mixed sample of peroxymonosulfate, manganese ferrite and fluorine-containing organic matters; and 2) carrying out discharge degradation by adopting the device. The device comprises a voltage regulator; the plasma generator is electrically connected with the voltage regulator; the dielectric barrier discharger is electrically connected with the plasma generator; wherein the dielectric barrier discharger is filled with a mixed dispersion liquid of peroxymonosulfate and manganese ferrite. The peroxymonosulfate and the manganese ferrite cooperate with the dielectric barrier discharge, so that multiple technical problems of low defluorination efficiency of fluorine-containing organic matters such as PFOA, low utilization efficiency of DBD energy and DBD active substances, low activation efficiency of PMS and the like are effectively solved.

This invention discloses an interference-resistant method for purifying DOM-rich, high-arsenic groundwater. The method involves adding an Fe / Co bimetallic organic framework (BOF) material and potassium persulfate solution to a high-arsenic groundwater sample rich in dissolved organic matter, maintaining stirring at room temperature, and achieving efficient simultaneous oxidation-adsorption removal of As(III). This method is unaffected by dissolved organic contaminants and common anions and cations. The method described herein, using the Fe / Co BOM coupled with peroxymonosulfate, can effectively purify complex, high-arsenic groundwater.

The present invention discloses a modified vermiculite-loaded cubic cobalt-manganese spinel material and a preparation method thereof, belonging to the technical field of environmental remediation functional materials. The present invention first synthesizes cubic cobalt-manganese spinel by in-situ coprecipitation on the surface and interlayers of vermiculite. The vermiculite-loaded cubic cobalt-manganese spinel material is then modified using hexadecyltrimethylammonium bromide to prepare the modified vermiculite-loaded cubic cobalt-manganese spinel material. The reaction conditions are mild, and no toxic or hazardous raw materials are involved. The prepared catalyst is stable, efficient, and environmentally friendly, effectively reducing the activation energy of oxidants such as peroxymonosulfate, thereby achieving efficient removal of perfluorooctanoic acid.

The present invention relates to the field of energy conservation and environmental protection, and more particularly to a catalyst for degrading organic pollutants, a preparation method thereof, and an application thereof. Double-modified MCM-49 zeolite nanocrystals are prepared in a one-step method by hexamethylimine and quaternary ammonium salt as a dual-template agent. This makes the prepared MCM-49 zeolite nanocrystals amphiphilic, i.e., having both hydrophilic and lipophilic properties and synergistic effects with peroxymonosulfate or peroxydisulfate, and can efficiently degrade organic pollutants such as antibiotics, dyes, and endocrine disruptors within a wide pH range, and is suitable for treating wastewater containing organic pollutants. The number of reuses is ≥10 times, and the activity retention rate of the catalyst reaches more than 95%. The catalyst preparation process of the present invention is simple, low cost, and has good application prospects.

The invention discloses a method for degrading benzo (alpha) pyrene in water by using gamma rays, belongs to the technical field of sewage treatment, and aims to solve the technical problem that the degradation efficiency and the degradation degree of the benzo (alpha) pyrene in the water by using the gamma rays in the prior art need to be further improved. An iron circulation-peroxymonosulfate composite system composed of a quaternized porous aromatic material, a sulfonated silicon-based hybrid channel material and a cross-linked beta-cyclodextrin material in a synergistic manner is constructed, and the quaternized porous aromatic material realizes stable enrichment of pollutants and peroxymonosulfate through a positive electricity interface; the sulfonated silicon-based hybrid channel material provides a continuous coordination and electron transfer environment for iron species, the cross-linked beta-cyclodextrin material performs confinement and secondary inclusion on hydrophobic pollutants and intermediates, and the sulfonated silicon-based hybrid channel material, the cross-linked beta-cyclodextrin material, the hydrophobic pollutants and the intermediates form a mutually linked reaction path in structure and function, so that construction and maintenance of a reaction micro-domain and continuous organization of the reaction path are realized, and the hydrophobic pollutants and the intermediates are subjected to continuous coordination and electron transfer. Therefore, the degradation efficiency and the cycling stability of pollutants are remarkably improved.

This invention provides a method for the degradation of bisphenol A (BPA) by persulfate activated by tea residue and iron filings. The method includes: freeze-drying and pulverizing tea residue to obtain coarse tea residue powder; sieving the coarse tea residue powder to obtain tea residue powder; mixing the tea residue powder with iron-containing substances to obtain an iron-containing tea residue mixture; adding the iron-containing tea residue mixture to a solution containing persulfate and BPA to initiate a chemical reaction; and measuring the BPA content to obtain the measurement results. This invention utilizes tea residue to replace pure tea polyphenols, constructing a persulfate degradation system activated by tea residue and iron filings, achieving a high-efficiency removal of 93.7% of BPA. This not only maintains the complexation and reduction advantages of tea polyphenols but also realizes the resource utilization of waste. It provides a low-cost, green, and sustainable technical path for BPA pollution control, with significant environmental and economic benefits.

Various formulations of a disinfectant are disclosed. The disinfectant includes an amount of potassium peroxymonosulfate, at least one organic acid, and at least one surfactant. The disclosed disinfectant can exist in both powder form and liquid form, and can also be in kit form having a variety of form factors. These disinfectant formulations offer higher efficacy and lower toxicity when compared with disinfectants known in the art, and when compared with potassium peroxymonosulfate alone.

The invention belongs to the technical field of sewage treatment, and particularly relates to preparation of an iron-carbon material-persulfate composition and application of the iron-carbon material-persulfate composition to degradation of perfluorooctanoic acid in a water body. The iron-carbon material-persulfate composition provided by the invention comprises an iron-carbon material and peroxymonosulfate, the iron-carbon material comprises a carbon material and vulcanized nano zero-valent iron loaded on the carbon material; the mass ratio of the iron-carbon material to the peroxymonosulfate is (0.1-2): (0.1-2). The method for degrading the perfluorooctanoic acid in the water body, provided by the invention, comprises the following steps: putting an iron-carbon material-persulfate composition into the water body containing the perfluorooctanoic acid, and degrading the perfluorooctanoic acid in the water body. According to the degradation method provided by the invention, the iron-carbon material and the peroxymonosulfate are utilized to generate a synergistic effect, the degradation effect on the PFOA in the water body under the environment concentration is good, the method has practical application value, secondary pollution is not caused in the degradation process, and the method is an effective method for removing the PFOA.

The invention discloses modified biochar, a preparation method and application of the modified biochar in organic wastewater treatment, and belongs to the technical field of material preparation. Microalgae powder, thiourea and sodium bicarbonate are modified by a one-step complete mixing method, then low-temperature drying is performed, and the algae-based biochar is prepared through carbonization in an oxygen-free high-temperature environment. The prepared modified biochar can activate a peroxymonosulfate system to rapidly degrade tetracycline pollutants in sewage, and the removal rate of the tetracycline pollutants within 40 min can reach 94% or above. The preparation method and the pollutant removal process are simple in step, efficient in performance and free of additional active metal addition, secondary pollution is avoided, good economic and environmental benefits are achieved, and the actual application value is outstanding.

The invention discloses sludge biochar as well as a preparation method and application thereof, and belongs to the technical field of sludge resource utilization. According to the method, the excess sludge of a municipal sewage treatment plant is used as a raw material, efficient sludge dehydration is achieved through gravity concentration, ferric chloride-thiourea combined chemical conditioning and a filter pressing technology, obtained dehydrated sludge cakes are subjected to high-temperature pyrolysis in an inert atmosphere through a tubular furnace, and the sludge biochar material is prepared. The prepared sludge biochar is used for an advanced oxidation system activated by peroxymonosulfate so as to efficiently degrade organic pollutants. According to the method, the raw materials are easy to obtain, the process is simple and convenient, the sludge dewatering performance is remarkably improved, reduction, harmlessness and resource utilization of the sludge are achieved, environmental, social and economic benefits are considered, and a novel technical path is provided for collaborative treatment of the sludge.

The application discloses a phosphate-enhanced cobalt monatomic catalyst system and application thereof in removal of halogenated pollutants. The phosphate-enhanced cobalt monatomic catalyst system comprises a cobalt-based monatomic catalyst with a Co-N2O2 coordination structure, a peroxymonosulfate and a phosphate. The phosphate-enhanced cobalt monatomic catalyst system is used for the first time, in which the phosphate is used as a synergistic component instead of an inhibiting factor, and is combined with the cobalt-based monatomic catalyst and the peroxymonosulfate, so that the degradation efficiency of the halogenated pollutants is remarkably improved.

The application provides a construction process for ex-situ chemical oxidation remediation of high-viscosity organic contaminated soil, and comprises the following steps: adding quicklime and inorganic porous structure material into the organic contaminant, crushing and screening after mixing and stirring; adding biochar, crushing and screening after mixing and stirring again; spreading the product obtained in the previous step, and turning and stirring; adding humic acid, organic waste mixture and peroxymonosulfate into the mixture after the previous step, and mixing and stirring uniformly; and curing under natural conditions. The application solves the problem of high viscosity and high water content of the organic contaminated soil by controlling the adding sequence of different reagents, reduces the water content of the clay soil, makes the clay soil loose, and makes the organic contaminant in the clay soil be oxidized by the oxidation reagent, so that the remediation effect is achieved.