64results about How to "Good environmental compatibility" patented technology

The invention relates to the technical field of moss cleaning in sewage treatment, and discloses a method for cleaning moss in a sedimentation tank, which comprises the following steps: S1, pretreating moss, and converting the moss into a state convenient to remove by physical and chemical methods; s2, spraying treatment: spraying the moss with reclaimed water containing sodium hypochloride in a temperature range of 20-30 DEG C; s3, performing ultraviolet irradiation, namely performing ultraviolet irradiation on the obtained first moss; s4, inhibiting the growth of moss, namely performing post-treatment on the second moss to inhibit the growth of the second moss; s5, waste is cleaned, moss residues, cleaning agents and other waste generated in the cleaning process are cleaned in time, influences of the residues on water quality are avoided, and moss is prevented from growing again. Through a physical and chemical combined mode, loose moss in the sedimentation tank is effectively removed firstly, then a solution containing sodium hypochloride is used for spraying the moss, it is ensured that all moss patches are in uniform contact, and the ideal chemical cleaning effect is achieved.

The invention discloses a synthesis method of a non-silicon defoaming agent and application of the non-silicon defoaming agent in the field of scandium extraction in hydrometallurgy. The defoaming agent is synthesized by a component A, a component B and a component C through a two-step reaction, the synthesis method comprises the following specific synthesis steps: 1) carrying out esterification reaction on an amino acid substance A and a fatty alcohol substance B to generate an amino ester substance D; and 2) carrying out substitution reaction on the amino ester substance D and a triazine compound C to obtain the non-silicon defoaming agent. The defoaming agent disclosed by the invention is wide in application range, can be applied to links such as a laterite-nickel ore hydrometallurgy front-end scandium extraction method and an MHP hydrometallurgy scandium impurity removal process, is added as an auxiliary agent in the extraction process, and is used for reducing the surface tension of liquid, preventing the formation and enrichment of a third-phase substance and reducing the occurrence of an emulsification phenomenon; the process stability and the output quality are improved, and the method has important industrial application value.

The invention discloses a composite loop tracking method of an anti-interference navigation signal receiver. The method comprises the following steps: copying a pseudo code and a carrier corresponding to a satellite signal based on a roughly captured signal; performing coherent operation to obtain a coherent integral value; performing FLL frequency discrimination, PLL phase discrimination and FFT frequency discrimination on the coherent integral value, and performing weighting processing to obtain a frequency error; carrying out carrier loop filtering on the frequency error to output a carrier loop tracking result; performing incoherent accumulation to obtain an incoherent integration result, and performing DLL phase discrimination to obtain an epoch code loop phase difference; performing code loop filtering on the epoch code loop phase difference to output a code loop tracking result; calculating a first frequency control word corresponding to the code loop according to the wave loop tracking result; and controlling code loop updating based on the first frequency control word and the code loop tracking result. According to the invention, stable tracking of navigation signals in different dynamic and different interference scenes can be realized.

The invention discloses a composite catalyst for a peracetic acid activation system and a preparation method and application thereof, and relates to the technical field of advanced oxidation water treatment. The preparation method of the catalyst comprises the following steps: preparing an aqueous solution of a cobalt source as a precursor solution; adding a manganese source into the precursor solution to obtain a Co-Mn mixed salt solution; adding a complexing agent into the Co-Mn mixed salt solution to form a stable sol system; heating the sol system at constant temperature to obtain wet gel; drying the wet gel to obtain a porous dry gel precursor; calcining the porous xerogel precursor, and then cooling and grinding to obtain the composite catalyst for the peracetic acid activation system. The composite structure in the catalyst greatly improves the rate of generating hydroxyl radicals and organic oxygen radicals by decomposing peracetic acid by promoting electron transfer circulation of a metal active center, shows good structural stability and recyclability, and is especially suitable for degradation of an organic pollutant sulfamethoxazole in a water body.

The invention discloses a method for biologically converting isorhamnetin, which comprises the following steps: adding a microorganism for producing glucosidase, glycosyl transferase and / or succinyl transferase, or producing glucosidase, glycosyl transferase and / or succinyl transferase into an isorhamnetin substrate, adding a glycosyl donor for synchronous conversion, and separating and purifying, thereby obtaining the isorhamnetin. And the isorhamnetin-3-O-glucoside, the isorhamnetin-3-O-beta-(6 ''-O-succinyl)-D-glucoside and / or the isorhamnetin-3, 7-O-diglucoside are obtained after the reaction is finished. The method is green, safe and high in conversion efficiency, the product has higher water solubility, the bioavailability and additional value of the flavone compound can be improved, and high-valued utilization of natural plant product raw materials is achieved.

The invention discloses a sanitary insecticidal composition containing cyprosulfuron and propoxur and application thereof, the effective components are cyprosulfuron and propoxur, the total content of the cyprosulfuron and propoxur is 2%-70%, and the balance is an auxiliary agent; the weight ratio of the cyprosulfuron to the propoxur is (15: 1)-(1: 15); the dosage form of the sanitary insecticidal composition is a suspending agent, an oil suspending agent, a dry suspending agent, wettable powder and water dispersible granules. According to the sanitary insecticidal composition, on one hand, the environmental compatibility is good, the use amount of pesticides is reduced, on the other hand, from the aspect of the action mechanism, the action mechanisms of the cyprosulfuron and the propoxur are different, cross resistance does not exist, the control effect is improved, and the insecticide resistance of pests can be delayed by compounding the two insecticides with different action mechanisms; the resistance treatment of the pests is facilitated.

The invention discloses a mixed herbicide containing pyroxasulfone and diflufenican, and relates to the technical field of pesticides, the herbicide takes pyroxasulfone and diflufenican as main effective components, and the mass ratio of pyroxasulfone to diflufenican is (0.1-80): (0.1-80). The mixed herbicide disclosed by the invention has the advantages of broad spectrum, quick effect, high efficiency, low toxicity, safety, environmental protection and the like when being applied to post-emergence weeding in wheat fields.

This invention provides an antibacterial and antistatic leather surface treatment agent, its preparation method, and its application, relating to the field of functional coatings technology. The treatment agent uses a water-based fluorocarbon-acrylic copolymer resin as a base material, and combines carbon nanotubes and conductive carbon black to construct a three-dimensional conductive network, which can stabilize the surface resistance of leather at 10 Ω·cm. 7 -10 8 This Ω-based antistatic agent exhibits superior long-lasting antistatic properties compared to traditional ionic antistatic agents. Simultaneously, it synergistically combines water-based thorium compounds with nano-titanium dioxide to form a highly efficient antibacterial system, achieving an antibacterial rate of >99.9% against Escherichia coli and Staphylococcus aureus within 24 hours, and still >95% after 6 months, thus solving the problem of short-lasting effectiveness of traditional antibacterial agents. As a water-based system, this treatment agent has VOC emissions <30g / L, meeting environmental protection requirements and satisfying the comprehensive needs of the automotive interior leather products industry for long-lasting antistatic, highly efficient antibacterial, and environmentally friendly performance.

The present invention relates to an offshore storage device for accommodating an inflatable liferaft, the inflatable liferaft comprising an internal volume containing a non-toxic gas, the internal volume having a controllable environment; an inflatable lifesaving device includes an interior volume, an uninflated inflatable lifesaving raft disposed in the interior volume, a gas cylinder disposed at least partially in the interior volume, the gas cylinder containing an inflation gas or a mixture of inflation gases for inflating the inflatable lifesaving raft, where a major portion of the inflation gas or the mixture of inflation gases is nitrogen or air, wherein the pressure indicator is operably connected with the gas cylinder to determine the pressure of the inflation gas in the gas cylinder.

The utility model relates to a kind of protective atmosphere electroslag furnace with furnace leg pneumatic clamping device, gas cylinder telescopic component is set in the lower of upper furnace leg;Lower furnace leg is set in the lower of upper furnace leg;Pneumatic clamping component is set in the upper of lower furnace leg;Gas cylinder telescopic component is through telescopic to pneumatic clamping component;Pneumatic clamping component clamps gas cylinder telescopic component, connects or disconnects the large current passage between upper furnace leg and lower furnace leg.Compared with the furnace leg clamping system of traditional single furnace head double-station rotary gas-protected electroslag furnace, the above problems are solved by adopting cylinder clamping mode and position encoder positioning mode, which has the advantages of low investment cost, high positioning accuracy, safe and reliable operation, convenient maintenance, good environmental compatibility and other advantages, solves the technical problems of traditional single furnace head double-station rotary electroslag furnace, such as complex sealing system, difficult leakage maintenance, large space occupation, high investment cost, poor environmental compatibility, large positioning error, low control accuracy and low production efficiency.

This invention discloses a method for improving the resistance to postharvest black spot disease in sweet potato tubers and maintaining their quality, belonging to the field of postharvest preservation technology for agricultural products. The method includes: selecting undamaged sweet potato tubers for callus treatment at room temperature for 48 hours, disinfecting with 1% sodium hypochlorite, rinsing with sterile water and air-drying, then soaking them in a 9.0 mmol / L benzothiadiazole (BTH) solution (containing 0.05% Tween 80) at room temperature for 60 minutes, removing them and air-drying them to complete the treatment. This invention induces the activation of the sweet potato tuber's own defense system through BTH, increasing the activity of key enzymes in phenylpropane metabolism, chitinase and other disease-resistant enzymes, promoting the accumulation of total phenols and lignin, maintaining cell membrane integrity, inhibiting starch degradation and abnormal increase in soluble sugars. Under storage conditions of 28±1℃ and 80-85%RH, it can significantly inhibit the expansion of black spot disease lesions and extend the storage period to more than 25 days. This method has no pesticide residues, is unlikely to cause pathogen resistance, is environmentally friendly, simple to operate, and cost-controllable, and is suitable for large-scale postharvest preservation of sweet potato tubers.

The application is the application of Spirodela and microorganisms in repairing cadmium-polluted water bodies and reducing cadmium content in cadmium-polluted paddy field rice grains. The specific steps are as follows: first, prepare Oscillospiraceae bacterial suspension, Enterobacter bacterial suspension and Pantoea bacterial suspension respectively; then mix the three kinds of bacterial suspensions in proportion to obtain a mixed bacterial suspension; then add the mixed bacterial suspension and Spirodela prepared in proportion to the cadmium-polluted water bodies to be repaired or the cadmium-polluted paddy fields to be repaired, and the Spirodela and the microorganisms form a "Spirodela-functional bacterial community" symbiotic system; the microorganisms further transport cadmium to the leaves by adsorption, transformation, leaf surface sedimentation or transpiration; finally, the Spirodela is concentrated for treatment, thereby repairing the cadmium-polluted water bodies or reducing the cadmium content in the cadmium-polluted paddy field rice grains. Through the application, the cadmium-polluted water bodies can be better repaired, and the cadmium content in the cadmium-polluted paddy field rice grains can be effectively reduced.

The invention discloses a TEMPO-CNT composite membrane based on layer-by-layer assembly, a preparation method and application, and belongs to the technical field of preparation of electrochemical wastewater treatment materials. According to the composite membrane, a layer-by-layer assembly process is adopted, a carbon-based conductive adsorption layer and a TEMPO catalytic function layer are sequentially constructed on a substrate layer, and an ordered layered structure is formed. According to the structure, the high specific surface area and conductivity of the carbon material are fully reserved, TEMPO active sites are uniformly exposed, and efficient cooperation of pollutant adsorption and electrocatalytic degradation is achieved. The composite membrane prepared by the invention can be adapted to various electrochemical systems such as direct current and alternating current (pulse), trace organic pollutants in wastewater can be efficiently removed with low energy consumption by applying corresponding voltage, and the composite membrane has the advantages of flexible operation, wide application scene, good environmental compatibility and the like.

The invention discloses a fire extinguishing agent special for a lithium ion battery fire as well as a preparation method and application thereof, and belongs to the technical field of lithium ion battery fire extinguishing agents. The main component of the special fire extinguishing agent for the lithium ion battery fire comprises a 16F fluorocarbon, and a preparation method of the 16F fluorocarbon comprises the following steps: (1) fluorination reaction: mixing cyclohexanone, silver fluoride and a catalyst, and reacting under the protection of ice bath and inert gas; (2) epoxidation reaction: adding the suprapoeia acid salt and silver metal particles, heating in a water bath, and fully reacting; and (3) further fluorination: taking the obtained product as a raw material, repeating the steps (1) and (2), and then purifying to obtain the product. The preparation method has the beneficial effects that the obtained C8F16O fluorocarbon has excellent high insulation performance, and does not cause short circuit or other electrical faults; a large amount of heat can be quickly absorbed, and the fire source temperature is effectively reduced. Due to the characteristic, the fire extinguishing efficiency is improved, and the heat radiation influence of a fire disaster on the surrounding environment is reduced.

The present invention relates to the technical field of electronic ceramic substrate materials, and more specifically, to a tape casting slurry, a green porcelain tape and a preparation method thereof. The tape casting slurry of the present invention is made of component A, component B and component C, wherein component A comprises: calcium borosilicate glass powder; component B comprises: solvent, binder, plasticizer and dispersant; component C comprises: one or more of acrylic adhesive, alkane mixture, pre-dispersant and auxiliary agent; the mass ratio of component A, component B and component C is 100:(50-150):(0.02-20). The tape casting slurry provided by the present invention has moderate viscosity and good fluidity, and can obtain a green porcelain tape with uniform film thickness and smooth surface.

The application discloses a pesticide synergist and a preparation method thereof. The pesticide synergist comprises a silanol-initiated polyether shown in formula I, an inositol phosphate-initiated polyether shown in formula II, an alcohol auxiliary agent and water. The silanol-initiated polyether shown in formula I and the inositol phosphate-initiated polyether shown in formula II are synergized, so that the adhesion, spreading, penetration and retention capacity of pesticide droplets on a target surface are significantly enhanced, and the utilization rate of the pesticide is effectively improved. The product has the advantages of low toxicity, environmental friendliness, multi-functional synergism, wide compatibility and the like, the preparation process is simple and stable, and the product is suitable for industrial production.

The invention belongs to the technical field of chemical engineering separation, and provides a natural eutectic solvent and a preparation method and application thereof, the natural eutectic solvent comprises the following components: caprolactam, citric acid and water; wherein the molar ratio of caprolactam to citric acid is (1-4): (1-2); the mass of the water is 20-40% of the sum of the mass of the caprolactam and the mass of the citric acid. By introducing water as a third component, the viscosity of the system is effectively reduced, the mass transfer performance is improved, and the denitrification efficiency is improved. The eutecticevaporate solvent provided by the invention can provide more reaction sites, has relatively strong removal capacity and selectivity on nitrogenous organic matters, and can realize efficient denitrification under mild conditions. The natural deep-eutectic solvent prepared by the preparation method disclosed by the invention is applied to removal of basic nitrides of oil products, and has the advantages of short time consumption and low dosage, namely high removal efficiency.

This invention relates to the fields of compound synthesis technology and pesticide technology, specifically to natural naphthoquinone derivatives and their preparation methods and applications. The natural naphthoquinone derivatives are either natural naphthoquinone derivatives containing aryl carboxylic acids or natural naphthoquinone derivatives containing diphenyl ether units. Some of the natural naphthoquinone aryl carboxylic acid derivatives and natural naphthoquinone diphenyl ether derivatives of this invention exhibit 100% control efficacy against six weeds (barnyard grass, crabgrass, foxtail grass, velvetleaf, amaranth, purslane, etc.) at a dosage of 300 a.g. / ha. These compounds achieve good weed control effects at low dosages and have relatively good safety for crops such as corn, wheat, peanuts, soybeans, and cotton. They can be used as selective herbicides in agriculture. The compounds of this invention can be developed and used as potential PSII inhibitors and post-emergence herbicides for broadleaf weeds. The derivatives have simple structures and preparation processes, low production costs, and broad application prospects.

This invention relates to the fields of adsorbent preparation and heavy metal remediation technology, and particularly to an amorphous iron-magnesium-aluminum silicate, its preparation method, and its applications. This invention utilizes molten salt-mediated ion exchange and lattice recombination under high-temperature conditions to completely and uniformly transform various silicate minerals from complex and inconsistent natural clay minerals into a non-naturally formed, structurally homogeneous, and stable amorphous iron-magnesium-aluminum silicate. This overcomes the limitation of traditional adsorbents having a narrow applicable concentration range, exhibiting extremely strong removal capabilities for heavy metal ions from high to low concentrations, achieving deep purification. Based on the theory of "increasing configurational entropy," this invention proposes the design of a silicate network framework with dense, highly active sites and multiple metals, breaking through the traditional approach of "simple modification" of natural clay minerals. It fundamentally reconstructs their material composition, providing a material that combines low cost with revolutionary adsorption performance.

The invention discloses an application of a gnetum macrophyllum extract in preparation of a nematicide. The gnetum giganteum extract can be used for preventing and treating potato stem nematode Ditylenchus destructor on crops such as potatoes and sweet potatoes, not only has a good nematode killing effect, but also is safe to the environment, human, livestock, natural enemies of pests and other beneficial organisms. The nematicide is simple in preparation process, low in cost and suitable for popularization and application.

This invention discloses a method for preparing and applying a coumaric acid-modified MOF nanopesticide loaded with chlorantraniliprole, belonging to the field of pesticide formulation technology. The nanopesticide comprises: an iron-based metal-organic framework carrier MIL-101(Fe); chlorantraniliprole loaded within the pores of the carrier; and coumaric acid modified on the surface of the carrier through electrostatic interactions. The preparation method includes three steps: MIL-101(Fe) carrier synthesis, chlorantraniliprole loading, and coumaric acid surface modification. The process is simple and the conditions are mild. This invention utilizes the alkaline environment of the fall armyworm's gut to trigger carrier degradation, achieving targeted and controlled release of active molecules. Simultaneously, the released MIL-101(Fe) is reduced under the action of GSH in the gut, generating reactive oxygen species through the Fenton reaction, forming a synergistic insecticidal effect with coumaric acid. Experiments have shown that this nanopesticide exhibits far superior insecticidal activity against fall armyworm compared to single agents or carriers, possessing excellent insecticidal activity and environmental compatibility, making it suitable for green agricultural production.

The invention relates to a preparation method of a catalyst for preparing acetyl n-propanol through catalytic oxidation of 2-methyltetrahydrofuran, and belongs to the technical field of catalyst preparation. The preparation method specifically comprises the following steps: dissolving a vanadium-containing compound serving as a main component of the catalyst and oxalic acid serving as a pore-forming agent into deionized water; heating and hydrolyzing the solution to completely evaporate water to obtain a solid; and roasting the solid in an air atmosphere to obtain the catalyst. The prepared catalyst is a catalyst for catalyzing molecular oxygen to oxidize 2-methyltetrahydrofuran to prepare acetyl n-propanol, and a new route for preparing acetyl n-propanol is realized.

The invention relates to a Mn-based contrast agent and a preparation method and application thereof, and the preparation method comprises the following steps: 1) dissolving deferasirox or a derivative thereof in water to obtain a solution a; (2) adding an aqueous solution of manganese salt into the solution a, and sequentially stirring, dialyzing and freeze-drying to obtain a Mn-based complex; 3) dissolving the Mn-based complex in water to obtain a solution b; and 4) adding an aqueous solution of human serum protein into the solution b, and sequentially stirring and performing ultrafiltration to obtain the Mn-based contrast agent, the structural general formula of deferasirox or the derivative thereof is as follows: # imgabs0 #, wherein R is carboxyl or carboxylic acid methyl ester group. Compared with the prior art, the preparation method disclosed by the invention is simple in synthesis process, low in energy consumption and good in environmental compatibility, and the prepared Mn-based contrast agent has relatively high relaxation rate, excellent thermodynamic stability and good biocompatibility and can be used as a T1 magnetic resonance imaging contrast agent for magnetic resonance imaging.

The present application relates to the field of compound synthesis technology and pesticides, and in particular to a pyridazine derivative, a preparation method and application thereof, the pyridazine derivative is an aromatic ether and an N-substituted phenylcarboxamide group; the aromatic ether is a substituted pyridazine group substituted phenyl ether; the substituted phenyl group is trifluoromethyl or halogen substitution, and the phenyl group containing the N-substituted phenylcarboxamide group is substituted by different halogen groups; the derivative has effective pre-emergence and post-emergence herbicidal activity, and can be applied as a herbicide; the structure of the derivative is simple, the production cost is low, and the application prospect is wide.

The utility model relates to the technical field of beam columns, and discloses a beam column connecting assembly which comprises a cylindrical female part and a circumferential connecting part arranged at the top of a column body. The T-shaped component is connected with the splicing component of the beam body; wherein the T-shaped son piece is connected with the barrel-shaped mother piece in an inserted mode; wherein the T-shaped sub-piece is connected with the beam body through a pin body which transversely penetrates through the beam body. According to the scheme, the installation efficiency of construction is remarkably improved, the labor intensity and the construction cost are reduced, and the use efficiency of wood and the attractiveness of the structure are improved by reducing the complexity of wood structure machining. And due to the standardized components and the prefabricated installation mode, the building block has the high popularization value and is particularly suitable for the rapidly-developed multi-layer wood structure building market. According to the scheme, a traditional wood structure connecting mode is fundamentally improved, an economical and efficient solution is provided, the construction and installation efficiency of the wood structure building is improved, and new possibility is opened for wide application of the wood structure building.

The application belongs to the technical field of agricultural fungicidal active ingredients, and particularly relates to a copper-tungsten polyoxometalate and a preparation method and application thereof in the field of agricultural fungicides. The existing agricultural fungicidal POM compounds have defects such as insufficient targeted bacteriostatic activity and insufficient preparation stability. The application provides a copper-tungsten polyoxometalate compound Cu-W-POMs, which exhibits excellent fungicidal activity and can effectively inhibit the cucumber fusarium wilt pathogen. Meanwhile, the compound also has a good inhibitory effect on crop disease pathogenic bacteria such as soybean seed rot, pear black spot and apple anthracnose. In particular, the compound can be used for preparing an agricultural fungicide to prevent and control cucumber fusarium wilt and other crop diseases.

The invention belongs to the technical field of degradation of high polymer materials, and relates to a method for degrading polyethylene glycol terephthalate microplastics. The method comprises the following steps: S1, pretreating polyethylene glycol terephthalate to obtain PET micro-plastic powder; and S2, adding the PET micro-plastic powder obtained in the step S1 into an electrolyte containing a surfactant, adjusting the pH value of the electrolyte to 4-7, stirring and electrolyzing at the temperature of 80-90 DEG C, and degrading the PET micro-plastic. Compared with the prior art, the method has the advantages that the polyethylene glycol terephthalate micro-plastic is quickly degraded within a short time under the condition that a catalyst is not added through the electrochemical oxidation effect, the reaction conditions are easy to operate, the cost is low, and the degradation rate is high.

The invention discloses a sanitary insecticidal compound composition and application thereof, the effective component of the compound insecticide is composed of an active component A and an active component B, the active component A is a piperic acid derivative compound, the active component B is an organophosphorus insecticide, and the organophosphorus insecticide is any one of dithiophosphos, fenthion, fenitrothion and pirimiphos-methyl. The total weight of the active component A and the organophosphorus insecticide accounts for 2-50% of the insecticidal composition, and the compounding weight ratio is (20: 1)-(1: 10). The binary composition solves the problem of resistance of sanitary pests to organophosphorus, improves the control effect, reduces the pesticide application amount, reduces the pesticide application irritation, and prolongs the persistence. The active component A is used as a lethal agent, has no cross resistance with organic phosphorus, has a good lethal effect, has no repellency to sanitary pests, is widely applied to places such as hotels, schools, factories and farms, and has a special effect on prevention and treatment of the sanitary pests.

The invention provides a refrigeration and heat supply circulation system coupled with carbon dioxide energy storage, and relates to the technical field of energy storage circulation, energy storage circulation is carried out based on conversion of a carbon dioxide critical state by taking carbon dioxide as a working medium, and cold and hot self-circulation in the refrigeration and heat supply circulation system is carried out through heat exchange. The cold and heat storage module is coupled to the carbon dioxide energy storage sub-module through the energy storage heat exchanger to conduct internal heat exchange of the refrigeration and heat supply circulation system, and heat exchange is conducted through the combination of the carbon dioxide energy storage sub-module and external energy. The refrigeration and heat supply module is coupled to the carbon dioxide sub energy storage module through the refrigeration and heat supply heat exchanger to conduct heat exchange between the refrigeration and heat supply circulation system and the outside, and the problems that an energy storage circulation system is low in energy utilization rate, large in environmental influence, low in system efficiency and unstable in energy utilization are solved. And the effects of improving the system efficiency, ensuring the stability of energy supply of the whole system and realizing zero carbonization of the technology are achieved.

This invention discloses a Bi@Ce-UiO-66-Br catalyst and its photocatalytic reduction of CO. 2 In this application, the catalyst is prepared by a solvothermal method using a ligand-functionalized Ce-based metal-organic framework (Ce-UiO-66-Br), followed by in-situ reduction encapsulation to confine and encapsulate metallic Bi within Ce-UiO-66-Br, forming a core-shell structured photocatalyst. The Ce-UiO-66-Br shell provides spatial confinement and dispersion stability for the metallic Bi, while the Bi core and the Ce-UiO-66-Br shell produce a synergistic catalytic effect, precisely controlling CO2 emissions. 2 The reduction reaction pathway directs the reaction to produce CH4. 4 The catalyst of this invention has a simple and highly controllable preparation process, and the resulting catalyst has a stable structure. It also exhibits photocatalytic CO2 production under simulated sunlight. 2 Reduction of CH 4 The selectivity is nearly 90%, and the photocatalytic stability is excellent; this catalyst can be directly applied to gas / liquid phase photocatalytic CO2 production. 2 The reducing system is CO. 2 Highly selective conversion of CH 4 It provides highly efficient core materials, which have both academic research value and industrial application prospects.