935 results about "Catalytic degradation" patented technology

The invention discloses a SnO2 / SnS2 / AgS nano material with piezoelectric electro-catalytic tooth whitening and sterilizing performance and a preparation method and application thereof, and the preparation method comprises the following steps: (1) dripping a silver nitrate aqueous solution into a prepared SnO2 / SnS2 nano material aqueous dispersion, carrying out hydro-thermal treatment for 2 hours, centrifuging, washing and drying to obtain a SnO2 / SnS2 / Ag2S ternary semiconductor heterojunction nano material; (2) food indigo is adopted to simulate tooth surface pigments, piezoelectric electro-catalytic degradation is carried out by using the SnO2 / SnS2 / Ag2S ternary semiconductor heterojunction nanomaterial, and the pigment degradation efficiency can reach 95% or above; (3) the SnO2 / SnS2 / Ag2S heterojunction nanomaterial is used for piezoelectric electro-catalysis treatment of the streptococcus mutans pellicle, and the antibacterial rate of the pellicle can reach 90% or above; and (4) compared with a 3% H2O2 aqueous solution for treating the enamel surface structure, the SnO2 / SnS2 / Ag2S nano-material piezoelectric electro-catalysis treatment of teeth has small damage to the enamel surface structure. According to the invention, more nano materials with tooth whitening and sterilizing performance and the preparation method thereof are provided, so that the problems of single variety, single preparation method, low electron-hole separation efficiency and large side effect of the existing tooth whitening and sterilizing nano materials are solved.

The invention discloses a multi-layer controllable degradation coating composition as well as a preparation method and application thereof, and belongs to the field of biodegradable high polymer materials and coating compositions. The coating composition comprises an outer protective layer and an inner functional layer, and the inner functional layer is arranged between a substrate and the outer protective layer and comprises a plurality of microcapsules. The key innovation lies in that the microcapsule encapsulates an enzyme capable of catalytically degrading the outer protective layer and is configured to be released after a predetermined delay time. The pH buffer system is integrated in the inner functional layer, and an optimal catalytic microenvironment is created for released enzyme, so that the outer protective layer is actively and quickly degraded, and programmable time-controlled removal is realized. The problem that the degradation rate of an existing biodegradable material is passive and uncontrollable is solved, and the coating has a remarkable application value in the field of seed coating or fertilizer controlled release by endowing the coating with a unique two-stage degradation characteristic.

The invention relates to the technical field of formaldehyde adsorption, in particular to a preparation method of modified activated carbon for removing formaldehyde, which comprises the following steps: S1, performing acidification pretreatment on coconut shell charcoal, and grafting the pretreated coconut shell charcoal with polyethyleneimine to obtain activated carbon loaded with polyethyleneimine; s2, carrying out dipping treatment and cyclohexanol treatment on the activated carbon loaded with polyethyleneimine to obtain functionalized activated carbon; s3, reacting the magnesium-aluminum hydrotalcite with a quaternary ammonium salt solution and a sodium benzenesulfonate solution to obtain modified hydrotalcite; reacting the modified hydrotalcite with a vinyl silane coupling agent to obtain vinyl hydrotalcite; s4, the vinyl hydrotalcite and 4-amino-3-hydrazino-5-sulfydryl-triazole are subjected to a reaction, and secondary modified hydrotalcite is obtained; and S5, dispersing the secondary modified hydrotalcite and the functionalized activated carbon in water, and adding glutaraldehyde to obtain the modified activated carbon. The modified activated carbon prepared by the preparation method disclosed by the invention realizes selective recognition, efficient adsorption and catalytic degradation of formaldehyde.

The invention belongs to the technical field of friction catalysis, and particularly relates to application of an aluminum oxide substrate in friction catalytic degradation of high-concentration organic dye wastewater, an aluminum oxide ceramic chip is used as a substrate, titanium dioxide nano powder is used as a catalyst, and the aluminum oxide ceramic chip is fixed at the bottom of a flat-bottom glass beaker; the method comprises the following steps: adding organic dye wastewater, a magnetic turntable and titanium dioxide nano powder into a flat-bottomed glass beaker, then putting the flat-bottomed glass beaker in a dark environment at room temperature, stirring and reacting on a magnetic stirrer for 90-150 minutes, and after the reaction is completed, completely degrading organic dye in the wastewater. According to the method, the aluminum oxide ceramic chip is added into a system for performing friction catalytic degradation on the organic dye wastewater by using the titanium dioxide nano powder as the substrate, so that the degradation rate of the organic dye is greatly improved, the complete degradation time of the organic dye is shortened, and a new thought is provided for performing friction catalytic degradation on the organic dye wastewater by using the titanium dioxide nano powder.

The invention relates to the technical field of industrial wastewater deep purification, and discloses an industrial wastewater deep purification system based on nano catalytic membrane separation, which comprises a pretreatment module, a catalytic degradation module, a membrane separation module, an intelligent control module and a regeneration maintenance module which are sequentially connected according to a treatment flow, the pretreatment module adjusts the water quality of inlet water to a range suitable for subsequent treatment through pH adjustment and suspended matter interception, that is, the pH is 2-11, and the turbidity is less than or equal to 50NTU; the catalytic degradation module is used for decomposing organic pollutants and mineralizing refractory substances under the excitation of ultraviolet / visible light by utilizing the photocatalytic characteristic of a nano catalytic membrane. The TiO2 / WO3 heterojunction nano catalytic membrane is adopted, so that deep oxidation of refractory pollutants such as phenol and sulfonamide antibiotics is realized, finally, the COD removal rate of 98.7% is achieved, and compared with a traditional photocatalytic process, the energy consumption is reduced by 54%.

The invention discloses a high-entropy layered double hydroxide with a strong strain effect and a preparation method of the high-entropy layered double hydroxide. The preparation method comprises the following steps: firstly, preparing ferric salt, cobalt salt, nickel salt, copper salt and zinc salt into a mixed aqueous solution of five metal salts; preparing sodium hydroxide and sodium carbonate into an alkali source aqueous solution; then mixing and stirring the mixed aqueous solution of the five metal salts and the alkali source aqueous solution to gradually form yellowish-brown precipitates, then transferring the yellowish-brown precipitates into a polytetrafluoroethylene reaction kettle, and further reacting in a drying oven; and finally, carrying out centrifugal separation, deionized water and absolute ethyl alcohol washing and freeze drying on the fully reacted precipitate to obtain brown powdery solid, namely the high-entropy layered double hydroxide. The high-entropy layered double hydroxide can be used for advanced oxidation catalytic degradation of tetracycline antibiotic wastewater, the strong strain effect of the high-entropy layered double hydroxide enhances the benefit of activating peroxymonosulfate to generate active free radicals, the efficiency of degrading water pollutants is improved, and the high-entropy layered double hydroxide has good application prospects.

The invention belongs to the technical field of catalyst preparation, focuses on a high-entropy alloy nanowire catalyst, and mainly relates to a preparation method and application of an AuCuAgPtNi catalyst. A one-pot wet chemical method is innovatively adopted, a 4-aminopyridine solvent and metal precursors of gold, copper, silver, platinum and nickel are fully and evenly mixed and placed in an oil bath pot at the temperature of 90 DEG C, then a reducing agent ascorbic acid is rapidly added, after specific reaction time, washing, drying and other operations are sequentially carried out, and the high-entropy alloy nanowire AuCuAgPtNi catalyst can be successfully prepared. The preparation method disclosed by the invention has the remarkable advantages of simple process, simple steps, convenience in operation and the like. In an alkaline environment, the prepared nanowire-shaped high-entropy alloy AuCuAgPtNi catalyst shows extremely excellent catalytic activity and selectivity for catalytic degradation of waste plastic polylactic acid, the waste plastic can be efficiently upgraded and converted into pyruvic acid, a new way is opened up for resource utilization of the waste plastic, and the application prospect is wide. The method has a wide application prospect in the fields of environmental protection and resource recovery.

The invention belongs to the technical field of pharmaceutical wastewater treatment, and particularly relates to a device and a method for treating antibiotic production wastewater by coupling catalytic hydrolysis and catalytic degradation. The device comprises a catalytic hydrolysis reactor and an electro-catalysis reactor, the two reactors are connected in series through a pipeline with a water stop valve, the catalytic hydrolysis reactor is divided into a plurality of compartments by water baffles, and each compartment is filled with a catalytic porous hydrolysis filler; and a cathode, an anode and a stirrer are arranged in the electro-catalytic reactor. By utilizing the porous hydrolysis filler in the device, selective catalytic hydrolysis of high-concentration antibiotics in wastewater is completed by controlling the hydraulic retention time, the anodic oxidation efficiency is improved by virtue of the high contact reaction area of the porous blocky anode, and efficient mineralization degradation of residual antibiotics and hydrolysates thereof is realized. The treatment device and method for the antibiotic production wastewater are good in selective hydrolysis effect, high in mineralization degradation efficiency, easy and convenient to operate and maintain and low in energy consumption.

The invention discloses an aeration type water treatment device for catalytic degradation of pollutants based on triboelectrification, and belongs to the field of sewage and wastewater treatment. The lower portion is of a hollow cone structure, and the upper portion is of a cylinder structure. Positive and negative friction particles with spherical structures are placed in the device, the built-in rotatable aeration device can rotate and uniformly distribute gas under the action of gas flow, a gas-liquid-solid three-phase vortex flow is formed in combination with the rotation action of the stirring paddle, the friction particles generate high-frequency collision to generate an electrification effect, and the gas-liquid-solid three-phase vortex flow is formed. Hydroxyl free radicals (. OH) and superoxide free radicals (. O2-) are generated, and organic pollutants are efficiently degraded. The externally added magnetic field can inhibit electron-hole recombination. The device can realize innocent treatment of toxic and harmful wastewater, and has better practical and economic values.

The invention provides a wastewater advanced oxidation catalyst and a preparation method and application thereof, the wastewater advanced oxidation catalyst is of a core-shell structure, the core is activated carbon containing copper oxide and optional ferrous sulfide, and the shell is a silicon oxide-aluminum oxide compound containing nano ferrous sulfide. The invention further provides a preparation method of the wastewater advanced oxidation catalyst and application of the wastewater advanced oxidation catalyst in organic wastewater treatment. The wastewater advanced oxidation catalyst has the characteristics of high catalytic degradation capability on organic pollutants and the like, solves the problem of copper dissolution, and improves the long-term effectiveness of the catalyst.

The invention provides a method for promoting acquisition of clean fuel by light / sound concerted catalytic degradation of waste plastics and upgrading and conversion thereof, which comprises the following steps: uniformly mixing g-C3N4, cadmium acetate and thioacetamide according to a predetermined proportion, pouring into a reaction kettle, placing in a high-temperature oven for a predetermined time, centrifuging, cleaning and drying to obtain a catalyst, the method comprises the following steps: loading a catalyst on the surface of aerogel, hydrogel or non-woven fabric to obtain an MTSJA-loaded catalyst, treating waste plastic with NaOH, adding the MTSJA-loaded catalyst, stirring under irradiation of a xenon lamp, starting ultrasound for reaction, and carrying out light / sound synergistic catalytic degradation on the waste plastic. According to the method, energy consumption is not needed, toxic and harmful gas is not generated, the purposes of energy conservation and environmental protection can be achieved, meanwhile, carbon dioxide in water can be catalytically reduced to generate clean energy such as methane in the process of degrading the waste plastic, and further obtaining of the energy is promoted.

The invention discloses a monatomic catalyst for activating peroxymonosulfate as well as a preparation method and application of the monatomic catalyst. The catalyst comprises a nitrogen and sulfur co-doped Ti3C2Tx nanosheet and an iron monatomic or cobalt monatomic targeted on the nanosheet in an asymmetric coordination structure. The preparation method comprises the following steps: mixing the Ti3C2Tx nanosheet, a precursor containing a nitrogen source and a sulfur source, and soluble metal salt, self-assembling, freeze-drying and pyrolyzing. The monatomic catalyst provided by the invention has excellent conductivity and electronic structure, can form a large amount of reactive oxygen species in a catalytic degradation system on the premise of low addition amount of peroxymonosulfate, and has the advantages of high activation efficiency on peroxymonosulfate, capability of effectively reducing the usage amount of peroxymonosulfate and the like; the peroxymonosulfate can be activated to achieve efficient purification of organic wastewater, the operation cost of the peroxymonosulfate activation technology can be effectively reduced, and meanwhile, the new environmental pollution risk caused by the fact that a large amount of peroxymonosulfate is used can be remarkably reduced.

The invention discloses a preparation method and application of a monatomic catalyst for catalytic degradation of ethanethiol, and belongs to the technical field of organic sulfur pollutant treatment.The atomic-scale dispersion of Ce species is achieved through HY molecular sieve FAU type topological structure constraint and cerium loading capacity limitation, the catalyst shows atomic-scale active sites, and the catalytic degradation of ethanethiol is achieved. The conversion path of ethanethiol can be accurately regulated and controlled, and efficient degradation of ethanethiol is realized; the topological confinement effect guarantees the stability of the monatomic catalyst, and the HY molecular sieve pore channel restrains migration of Ce atoms and inhibits agglomeration of Ce metal, so that the monatomic catalyst shows good anti-sintering ability, and at the same time, sulfur poisoning and carbon deposition rate are slowed down.

The invention discloses a self-template synthesized linear biochar-based bimetallic material as well as a preparation method and application thereof, and belongs to the technical field of carbon materials. The method comprises the following steps: pretreating ganoderma lucidum residues, and pyrolyzing in a nitrogen atmosphere to prepare charcoal; and mixing the prepared biochar with cobalt nitrate and sodium molybdate to prepare CoMoO4 nanoparticles with in-situ growth of the biochar, and then washing and drying to obtain the BC-coated CoMoO4 linear biochar-based bimetallic material. Heterojunctions formed by binding sites of cobalt-molybdenum bimetal and biochar in the material form more defect sites, the synergistic effect of the metal and the micro-nano fibrous biochar is exerted, the degradation rate in the application of catalytic degradation of bisphenol A can reach 98.18% or above, a multiple reaction mechanism with sulfate free radicals is jointly shown, and the photocatalytic degradation of bisphenol A is realized. And the method has higher adaptability and effectiveness for complex pollutants.

The invention relates to a method for catalytically degrading a polyester material by using an ionic liquid and application of the polyester material, and mainly solves the technical problems of high energy consumption, environment unfriendliness and complex process in polyester material recovery research in the prior art. According to the technical scheme, the novel method for catalytically degrading the polyester material through the ionic liquid comprises the steps that the ionic liquid is used as a catalyst, diol is used as an alcoholysis agent, polyester is catalytically degraded, and the ionic liquid has the following general formula: A + B-(I); in the formula, A < + > is an organic alkali cation, and B <-> is an alkoxy anion, the problem is well solved, and the method can be applied to polyester recovery industry.

The invention discloses a near-infrared light response ultrathin nanosheet sulfur-doped BiOCl photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. The preparation method comprises the following technical steps: (1) preparing a BiOCl nanosheet; and (2) preparing the sulfur-doped BiOCl nanosheet. By adopting a secondary hydrothermal method and controlling the dosage of thioacetamide and BiOCl nanosheets, the prepared catalyst is an ultrathin nanosheet with uniform morphology, the average size is 70-120nm, the catalyst has light response in a near-infrared light region of 780-1200nm, the light absorption capacity of the catalyst is better, and near-infrared light response can be achieved. The catalyst is applied to catalytic degradation of ENR, the ENR degradation rate under visible light is 66.87%, and the degradation effect is good; under near-infrared light, the ENR degradation rate is 9.25%, and the degradation performance from zero to existence is achieved. The preparation method disclosed by the invention is simple, mild in condition, easy to control, low in raw material consumption, free of complex operations such as centrifugation, low in preparation cost and easy to popularize and apply.

The invention discloses a charge-discharge energy-saving electro-catalysis sewage treatment method which comprises the following steps: step 1, cleaning a carbon electrode, inserting the carbon electrode into sewage as a cathode and an anode at the same time, and arranging a magnetic stirrer at the bottom of an electrochemical reaction tank; step 2, applying constant voltage or constant current to the working electrode to ensure that the voltage can degrade pollutants, the anode does not generate oxygen evolution reaction, and the cathode does not generate hydrogen evolution reaction; step 3, stopping applying voltage or current to the working electrode, monitoring open-circuit voltage, gradually reducing the open-circuit voltage, and continuously degrading pollutants by utilizing the electric energy stored by the electrode; and step 4, repeating the step 2 and the step 3 until the electrocatalytic degradation is completed. Under the condition that the removal effect is guaranteed, electric energy is saved, and about 30-90% of energy consumption is reduced; the constant-current charging catalysis step ensures that the current density is controllable, and safe production is ensured; the process is simple, does not need special equipment and materials, and is suitable for upgrading and reconstruction of existing sewage treatment systems.

The invention belongs to the field of wastewater treatment, and particularly relates to a method for co-treating high-salt degradation-resistant organic wastewater based on electro-polymerization of in-situ activated chlorine free radicals of a penetrating electrode. The method comprises the following steps: by taking a penetrating electrode as an anode, sequentially and alternately arranging the anode and the cathode to form an electrode group, placing the electrode group in a reaction tank, connecting the cathode and the anode of the electrode group with a direct-current power supply, and carrying out electrocatalytic degradation on the high-salt degradation-resistant organic wastewater to be treated in the reaction tank; the transmission type electrode comprises a porous conductive substrate and a metal oxide catalytic layer loaded on the surface of the porous conductive substrate. Under the action of low current, the metal oxide catalytic layer of the anode activates chloride ions in the wastewater in situ to generate chlorine free radicals, and refractory pollutants are degraded through the action of electrocatalytic oxidation; meanwhile, a low-current polymerization reaction is initiated to generate a polymer to adsorb pollutants, so that electrocatalytic oxidation and polymerization synchronous synergistic decontamination is realized.

The invention provides application of a Lewis acid-base eutectic solvent in sludge modification, modified sludge, a preparation method and application of the modified sludge, sludge coke slurry and application of the sludge coke slurry, and relates to the technical field of sludge resource utilization. According to the invention, the Lewis acid-base eutectic solvent is adopted to modify the sludge, so that the catalytic degradation of hydrophilic oxygen-containing functional groups (HOFG) in the sludge can be effectively promoted, the interaction between the hydrophilic oxygen-containing functional groups and water molecules is weakened, the conversion from bound water to free water is promoted, and the water content of the sludge is remarkably reduced. Moreover, the Lewis acid-base eutectic solvent promotes bound water to be converted into free water, so that not only is the viscosity of the sludge reduced, but also the flowability of the sludge is improved, and the treatment and processing characteristics of the sludge are optimized. The modified sludge obtained through modification of the Lewis acid-base eutectic solvent is used for preparing slurry fuel, the addition amount of the modified sludge is large, and resource utilization of the sludge is achieved.

The invention relates to the technical field of wastewater treatment, in particular to a composite bio-based wastewater treatment agent and a wastewater treatment method.The composite bio-based wastewater treatment agent is applied to treatment of industrial wastewater, heavy metal ions in the industrial wastewater can be efficiently removed, and organic pollutants can be efficiently adsorbed and catalytically degraded; the negative influence of the industrial wastewater on the environment is reduced, the water quality is improved, heavy metal resources are recycled, and harmless and resourceful treatment of the industrial wastewater is realized.

The invention belongs to the technical field of chemical recycling, and particularly relates to a one-way depolymerization, high-purity and high-yield epsilon-CL closed-loop recycling method. According to the method, only trace acetylacetone metal salt is used as a catalyst, the epsilon-caprolactone monomer is recovered in a manner of in-situ catalytic degradation of PCL (polycaprolactone) under the assistance of heating and temperature rise in a low-vacuum environment, the depolymerization efficiency of 100% is realized, and the problems of low depolymerization yield, easiness in carbonization, long time, low purity of recovered products and the like in an existing method are solved. The product obtained by the method disclosed by the invention is pure, does not need complex post-treatment such as secondary purification, water removal and the like, has reaction activity of 100% repolymerization, can be directly used for repolymerization reaction to obtain regenerated PCL, and has the tensile strength of 31.3 MPa and the elongation at break of 831%. According to the method disclosed by the invention, polymer-monomer-polymer closed-loop circulation of PCL is perfectly realized by a mild depolymerization reaction process, and the possibility of industrial depolymerization-polymerization is expected to be realized.

The invention provides a double-defect-modified porous carbon nitride photocatalyst prepared by one step from ferromolybdic acid as well as a preparation method and application of the double-defect-modified porous carbon nitride photocatalyst. The catalyst is of a thin-layer porous structure, so that the specific surface area of the catalyst is increased, and more surface active sites are provided for adsorption and reaction; compared with pure g-C3N4, the visible light absorption intensity of the catalyst is obviously enhanced, due to the existence of surface N vacancies and defects formed by doping of metal oxides, effective charge separation is enhanced, the photon-generated carrier separation and transfer capacity is higher under visible light irradiation, and the catalytic activity is remarkably improved. When the photocatalyst is applied to degradation of tetracycline antibiotic pollutants, photocatalytic degradation of tetracycline can be realized only under the condition of low-power 5W LED visible light, the preparation process is simple, and the cost is lower.

The invention relates to a method and a device for preparing piezoelectric catalytic degradation PFAS nano barium titanate from sludge graded extracts, and belongs to the technical field of sludge utilization environments. The method comprises the following steps: uniformly mixing fresh sludge and modified cation resin, and extracting a cation resin extracting solution to obtain the cation resin extracting solution and cation sludge; uniformly mixing the cation mud and the modified anion resin, and extracting an anion resin extracting solution to obtain the anion resin extracting solution and the cation mud; mixing the sludge and alkali for reaction to obtain an alkali extracting solution and extraction residues; mixing barium salt with the cation resin extracting solution to obtain a barium complexing solution, and mixing titanium salt with the anion resin extracting solution to obtain a titanium complexing solution; and mixing the barium complexing solution with the same volume of the alkali extracting solution, then adding the titanium complexing solution with the same molar ratio, heating, drying and calcining to obtain the piezoelectric catalytic degradation PFAS nano barium titanate. According to the method, multi-stage extraction can be carried out according to application property requirements, extraction is sufficient, the comprehensive utilization rate of sludge is high, dispersity is good, the particle size is small, piezoelectric catalysis performance is high, and synthesis cost is low.

The invention relates to a preparation method and application of a composite piezoelectric catalytic material NaNbO3-coated BiFeO3 for rapidly degrading antibiotics, NaNbO3 is flaky crystal grains with [001] crystallographic orientation prepared by a two-step molten salt method, and BiFeO3 is micro-nano particles prepared by a coprecipitation method. Composite micro-nano BiFeO3 powder and [001] oriented NaNbO3 flaky grains form a heterojunction, conversion of mechanical energy and electric energy of the material is achieved under the ultrasonic vibration condition, inductive charges are generated on the surface of the material, and photon-generated carriers move reversely under driving of a built-in electric field. According to the invention, the piezoelectric catalytic degradation capability of the BiFeO3 and NaNbO3 composite piezoelectric catalytic materials with different proportions on four antibiotics, namely oxytetracycline, levofloxacin, carbamazepine and paracetamol in different time periods is researched. When the mass ratio of the BiFeO3 to the NaNbO3 composite material is 1: 3, the oxytetracycline degradation rate within 30 min can reach 78.2%, the oxytetracycline degradation rate within 120 min can reach 91.8%, and the piezoelectric electro-catalysis characteristic is rapid and efficient. The method disclosed by the invention has important significance in developing a high-efficiency piezoelectric catalyst for degrading antibiotics.

The invention discloses an electrode material for electrocatalytic degradation of organic wastewater containing high-concentration nitrate and application of the electrode material, a copper salt precursor solution and a tin salt precursor solution are sequentially attached to the surface of a Ti plate, so that a Ti / Cu-Sn multi-metal coating electrode material is obtained, the Ti / Cu-Sn multi-metal coating electrode material is used as a cathode, a metal electrode is used as an anode to construct an electrolytic tank, and the high-concentration nitrate-containing organic wastewater is obtained. The catalyst is used for simultaneous degradation of NO3 <-> and COD in organic wastewater containing high-concentration nitrate and co-production of hydrogen. The electrode material is simple in preparation process, low in cost and high in catalytic activity and stability, nitrate and organic matter in wastewater can be safely, mildly and simultaneously removed in the electrolysis process of the electrode material, and secondary pollution byproducts such as ammonia nitrogen and nitrite are hardly generated. Tests show that the removal rate of nitrate radicals can reach 99.72%, the removal rate of COD (Chemical Oxygen Demand) can reach 84.61% and the selectivity of nitrogen can reach 99.83% when the method is used for treatment.

The invention discloses a method for degrading organic pollutants in a water body by using modified goethite reinforced ferrate, the method comprises the following steps: adding modified goethite into a degradation system constructed by ferrate to degrade the organic pollutants in the water body, and the modified goethite is prepared by calcining metal-doped goethite as a raw material. The doped metal in the metal-doped goethite is cobalt and / or copper. According to the method, the ferrate is activated by the modified goethite with rich oxygen vacancies and surface activity Fe (II) sites, so that the ferrate can be promoted to quickly generate a large number of strong-activity species, a catalytic degradation system taking high-valence metal as a main component is constructed, and organic pollutants can be efficiently degraded under the condition that the dosage of the ferrate is less; the method can realize efficient removal of various organic pollutants in water, has the advantages of strong degradation selectivity, high degradation efficiency, good removal effect, less catalyst and oxidant dosage, no secondary pollution and the like, and has high use value and good application prospect.

The invention provides a CeOx-TiO2 catalyst for efficiently catalyzing and degrading chlorine-containing VOCs (Volatile Organic Compounds) as well as a preparation method and application of the CeOx-TiO2 catalyst, and belongs to the field of catalysts. The method comprises the following steps: dispersing a titanium source and a cerium source in deionized water, then adding ammonia water, stirring, filtering and washing until the pH value of filtrate is close to neutral, and drying and roasting to obtain the cerium nano island catalyst CeOx-TiO2 with uniformly dispersed titanium dioxide surface. According to the invention, the zeta negative potential of titanium dioxide and the positive potential of [Ce (OH) x] y < + > interact under an alkaline condition to prepare cerium active sites which are isolated and dispersed on the surface of titanium dioxide, and finally, precursor powder is calcined to prepare the Cl-VOCs catalyst with cerium nano islands dispersed on the surface of titanium dioxide. The Cl-VOCs catalyst prepared by the method has low-temperature purification performance on chlorobenzene and chlorine poisoning resistance, and meanwhile, the sintering resistance of the Ce active component is also effectively relieved.

The invention relates to a preparation method and application of a 2D / 2D heterostructure wave-absorbing material based on solvent regulation and control growth, and belongs to the technical field of preparation of wave-absorbing materials. The preparation method comprises the following steps: constructing 2D tabular Bi4NbO8Cl which mainly exposes {001} and {110} high-activity crystal faces through a crystal face engineering technology, and further performing in-situ growth of a 2D ZnIn2S4 nanosheet on the surface of Bi4NbO8Cl, thereby obtaining the ZnIn2S4 / Bi4NbO8Cl composite wave-absorbing material. Under MW driving, the material shows ultrahigh catalytic degradation activity on OTC, and has potential application prospects in the aspect of purification of environmental water bodies polluted by antibiotics.

The invention relates to the technical field of friction catalytic degradation of pollutants, in particular to application of nano bismuth ferrite in friction catalytic degradation of high-concentration methyl orange dyestuff, and a specific catalysis method comprises the following steps: S1, pouring a methyl orange solution into a container, and adding bismuth ferrite nano powder into the methyl orange solution; s2, adding a friction turntable into the container, wherein the bottom surface of the friction turntable is in contact with the bottom surface of the container; s3, enabling the friction turntable to rotate through external force, and completing catalytic degradation of methyl orange by the bismuth ferrite nano powder. According to the method, methyl orange is degraded in a friction catalysis manner, so that the degradation efficiency is greatly improved, and further exploration of a friction catalyst is promoted.

The invention relates to a preparation method of an A-site cerium-doped double perovskite catalyst and an application of the A-site cerium-doped double perovskite catalyst in catalytic oxidation of toluene, and belongs to the technical field of environmental catalytic materials. Aiming at the technical defects that a traditional noble metal catalyst is high in cost and the oxygen mobility of a perovskite material is insufficient, the double perovskite material is designed through A-site Ce < 3 + > / Ce < 4 + > doping and B-site Co / Mn bimetal collaboratively, and the chemical general formula is La2-xCexCoMnO6 (x is greater than or equal to 0 and less than or equal to 0.3). The catalyst shows remarkable advantages in catalytic oxidation of toluene: under the conditions that the mass space velocity is 18000 mL. (g.h) <-1 > and the toluene concentration is 2000 mg. M <-3 >, T50 (50% conversion rate temperature) is 223 DEG C, T90 (90% conversion rate temperature) is 243 DEG C, and the catalyst is superior to an undoped sample La2CoMnO6 catalyst. The preparation method of the catalyst is simple, the product selectivity is high, the stability is good, and the catalyst is especially suitable for efficient low-temperature catalytic degradation of methylbenzene.