47 results about "Formaldehyde degradation" patented technology

The invention discloses a manganese-based catalyst for efficiently degrading formaldehyde at room temperature and a preparation method thereof, the catalyst is prepared by taking a carbon dioxide storage material (CO2SM, ZL201410578343.6), Mn < 2 + >, alkali metal ions (A = Na < + >, K < + >, Li < + > or Cs < + >) and third metal ions (Mx < + > = Zn < 2 + >, Cd < 2 + >, La < 2 + >, Gd < 3 + >, Pr < 3 + >, Sm < 3 + >, Nd < 3 + >, Ce < 3 + > or La < 3 + >) as raw materials through a one-step hydrothermal method, a metering titration method or a stirring method combined with a thermal decomposition method. The manganese-based catalyst prepared by the invention can efficiently catalyze and degrade formaldehyde at room temperature, and the dissolution degradation rate of 10mL of 100mg / L formaldehyde can reach 94.86% at most. The manganese-based catalyst is simple in preparation method and low in cost, can be used in combination with existing air purification equipment, and is easy to popularize and apply.

The invention discloses conductive flame-retardant thermal-insulation aerogel capable of enhancing room-temperature catalytic formaldehyde degradation as well as a preparation method and application of the conductive flame-retardant thermal-insulation aerogel, and relates to the technical field of graphene-based aerogel. The preparation method comprises the following steps: loading a transition metal oxide catalyst with a formaldehyde catalytic oxidation performance on a graphene oxide sheet layer through a coprecipitation method; uniformly mixing the graphene loaded with the transition metal oxide catalyst in a sodium alginate aqueous solution, and performing freeze drying; and soaking in a mixed solution containing calcium salt and boric acid for cross-linking reaction, and then freeze-drying again to obtain the product. The material has good flame retardance and thermal insulation performance, can enhance the catalytic oxidation efficiency of low-concentration formaldehyde at room temperature under the assistance of a stable and controlled external electric field, realizes the long-term catalytic degradation effect on formaldehyde at room temperature, and can be applied to the field of buildings, such as buildings, buildings and the like. The multiple purposes of efficient heat preservation of the building envelope structure, remarkable improvement of fireproof safety and effective control of indoor formaldehyde pollution are achieved.

According to the preparation method of the efficient Pd-based bimetallic catalyst and the application of the efficient Pd-based bimetallic catalyst in air purification, Ba < 2 + > and Pd < 2 + > are introduced, the loading capacity and dispersity of Pd < 2 + > are improved, the formaldehyde degradation performance is improved, meanwhile, compared with a traditional high-loading-capacity Pd-based bimetallic catalyst, the usage amount of precious metal Pd is effectively reduced, and the cost is reduced. Therefore, the preparation cost of the Pd-based bimetallic catalyst is reduced. By adopting a step-by-step Ba < 2 + > and Pd < 2 + > adsorption treatment mode, Pd < 2 + > can be more uniformly distributed on the TiO2 carrier and has high dispersity, and more Pd active sites can be exposed and participate in a catalytic reaction during application, so that the utilization rate of Pd is increased, and material waste is reduced.

The present invention provides a binary composite material for highly efficient visible-light catalytic formaldehyde removal, its preparation method and application, which include the following preparation steps: Using Ce(NO3)3·6H2O as a reaction raw material, CeO2 is obtained by calcination; A basic mixed solution containing CaCl2 and SnCl4·5H2O with a molar ratio of 1:1 is mixed with CeO2, and transferred to a stainless-steel autoclave lined with polytetrafluoroethylene, and hydrothermal reaction is carried out at 180-200 °C. The product is centrifuged, washed, and vacuum dried to obtain CaSn(OH)6 / CeO2; wherein, the molar ratio of CeO2 to CaCl2 is 1:1. The present invention further proves through experiments that when the dosage of CaSn(OH)6 / CeO2, single CaSn(OH)6, and single CeO2 is the same (all 0.2 g), and the formaldehyde content in the sewage to be treated is the same (all 1 ppm), the formaldehyde degradation efficiency of CaSn(OH)6 / CeO2 provided by the embodiment of the present invention reaches 88.9% within 30 min, while the formaldehyde degradation efficiency of the single CaSn(OH)6 semiconductor photocatalytic material is only 4.9% within 30 min, and the formaldehyde degradation efficiency of the single CeO2 photocatalytic material is 39.6% within 30 min.

The invention relates to the field of coatings, in particular to an antibacterial formaldehyde-removing art coating and a preparation method thereof.The antibacterial formaldehyde-removing art coating is prepared from, by weight, 35-55 parts of organic silicon modified acrylic emulsion, 10-20 parts of filler, 3-8 parts of antibacterial formaldehyde-removing composite material, 5-10 parts of pigment, 0.1-0.3 part of defoaming agent, 0.1-0.5 part of dispersing agent, 0.2-0.6 part of thickening agent and 10-20 parts of deionized water. According to the prepared coating, the self-crosslinking type organic silicon modified acrylic emulsion is used, a compact and durable paint film can be formed, and stable support is provided for functional components. The antibacterial formaldehyde-removing composite material and the porous filler are introduced, formaldehyde and bacteria are physically adsorbed and enriched through a porous frame of the antibacterial formaldehyde-removing composite material and the porous filler, then a loaded bimetallic complex is used as an efficient catalytic center, formaldehyde is degraded into harmless substances, and meanwhile, the antibacterial formaldehyde-removing composite material also has an efficient and lasting broad-spectrum antibacterial effect.

The application relates to the technical field of building materials, and particularly discloses a mortar material capable of degrading formaldehyde as well as a preparation method and application thereof. The mortar material capable of degrading formaldehyde comprises the following raw material components in mass fractions: cement 75-95 parts, quartz sand 100-130 parts, reinforcing agent 10-15 parts, water reducing agent 1-2 parts, dispersant 3-5 parts, stabilizer 0.5-1 part and composite degradation material 30-50 parts; wherein the composite degradation material comprises yttria modified sericite powder, expanded graphite powder loaded with manganese dioxide and tourmaline powder. The mortar material capable of degrading formaldehyde provided by the application has good compressive strength and bending strength and excellent formaldehyde degradation performance, can realize rapid formaldehyde degradation, does not need to rely on a light source, and effectively makes up for the defects of the prior art.

The application discloses a kind of delta-MnO2-GO catalyst and its preparation method and application in room temperature formaldehyde degradation, it is related to inorganic catalyst technical field.The preparation method of delta-MnO2-GO catalyst of the application can significantly limit the growth of manganese dioxide nanosheet by doping with low amount of GO, to manufacture abundant mass transfer transmission channel, delta-MnO2-GO catalyst presents unique two-dimensional crown structure, two-dimensional coral-like hierarchical pore structure delta-MnO2 nanorod is uniformly dispersed on the GO of plane structure, greatly promote the exposure of catalytic site and the mass transfer of reactant, produce a large number of surface active oxygen ROS and hydroxyl radical-OH, greatly maintain the excellent catalytic activity and stability to HCHO degradation, stably realize nearly 100% HCHO elimination at room temperature.

The invention discloses a photocatalyst for hydrogen production by reforming a formaldehyde solution and a preparation method of the photocatalyst, and belongs to the crossing field of catalyst preparation and a hydrogen energy technology. The photocatalyst is a bimetallic structure material with different Mn and Ni molar ratios, and the molecular formula of the photocatalyst is MnxNiy / C3N4. The preparation method comprises the following steps: adding manganese acetate and nickel chloride in different proportions to adjust the feeding ratio of Mn to Ni in the catalyst, uniformly dispersing the mixture in deionized water containing C3N4, dropwise adding a sodium borohydride solution, continuously stirring to obtain a precursor, and calcining in a hydrogen atmosphere to obtain the catalyst. The photocatalyst can synchronously realize formaldehyde degradation and stable hydrogen production, and the hydrogen production rate can reach 134.53 mmol.h <-1 >. G <-1 >. The photocatalyst shows excellent photocatalytic formaldehyde reforming hydrogen production performance under the mild reaction condition without a sacrificial agent, the problem that a traditional catalyst depends on the sacrificial agent can be solved, and the dual benefits of pollutant degradation and clean energy preparation can be achieved through efficient conversion of formaldehyde.

This invention provides an N-doped TiO₂ 2 -BiVO 4 This invention relates to heterojunction photocatalytic coatings, their preparation methods, and applications, belonging to the field of photocatalytic materials technology. The invention achieves nitrogen doping through nitrogen source pyrolysis, forming a N-doped Bi-Ti heterojunction. Furthermore, by optimizing the Bi:Ti molar ratio, a tight heterojunction interface can be formed, redshifting the light absorption edge to 600 nm and improving carrier separation efficiency. N doping introduces intermediate energy levels, resulting in BiVO₄… 4 By broadening the light response range, the two work together to achieve a net formaldehyde degradation rate of 78% in 24 hours, while also solving the problems of low visible light utilization and poor adhesion of existing photocatalytic coatings.

The application discloses a composite photocatalytic material and a preparation method and application thereof, and relates to the technical field of photocatalytic materials. 12 The composite photocatalytic material comprises a bismuth-based composite oxide layer and a phenolic resin layer loaded on the surface of the bismuth-based composite oxide layer; the material of the bismuth-based oxide layer is selected from at least one of Bi2WO6, BiVO4, Bi2Mo3O 12 The phenolic resin layer is irradiated by photon energy, surface-escaping electrons can participate in a water redox reaction to generate H2O2, and then the H2O2 can react with formaldehyde gas to generate formic acid and water, so that the formaldehyde degradation is realized; and the bismuth-based composite oxide layer can promote water splitting to generate oxygen under the action of light, the generated oxygen can promote the redox reaction of the phenolic resin layer, accelerate the generation of H2O2, improve the concentration of H2O2, and thus improve the formaldehyde degradation efficiency, so that the composite photocatalytic material can realize efficient photocatalytic degradation of formaldehyde.

The application discloses a preparation method of a photocatalytic material Bi / Bi2MoO6 / BiOBr for indoor formaldehyde degradation, which comprises the following steps: dissolving bismuth nitrate and sodium molybdate in ethylene glycol respectively to prepare bismuth nitrate solution and sodium molybdate solution; adding the sodium molybdate solution into the bismuth nitrate solution drop by drop to prepare a mixed solution, adding ethanol and BiOBr, stirring and ultrasonicating, transferring into a high-pressure reaction kettle, heating to 160 DEG C and keeping for 12 hours, drying the product to obtain Bi2MoO6 / BiOBr; dissolving the Bi2MoO6 / BiOBr in water and ultrasonicating, adding a sodium borohydride solution and stirring, washing with water and centrifuging, and drying the product to obtain Bi / Bi2MoO6 / BiOBr. The application provides a preparation method of the photocatalytic material Bi / Bi2MoO6 / BiOBr, which adopts a simple hydrothermal method and a sodium borohydride reduction method, and the ternary photocatalyst formed has excellent degradation effect on gaseous formaldehyde.

The invention relates to the field of filter materials, in particular to a photocatalyst-loaded filter screen and a preparation method thereof.The photocatalyst-loaded filter screen comprises a filter screen body and a photocatalyst coating, the photocatalyst coating is loaded on the surface of the filter screen body in the form of gel, the gel is formed by co-doped sol, and the photocatalyst coating is coated on the surface of the filter screen body. The co-doped sol is obtained by carrying out hydrolysis-polycondensation reaction on an ethanol mixed solution of tetrabutyl titanate, magnesium nitrate, ferric nitrate and urea, and the molar ratio of Ti to Mg to Fe to N in the ethanol mixed solution is 100: 3: 2: 5. According to the photocatalyst-loaded filter screen disclosed by the invention, Ti, Mg, Fe and N are co-doped, so that the formaldehyde degradation rate of the material is synergistically improved on the basis of improving the hydrogen yield of the material, and the photocatalytic activity and the spectral response range are simultaneously improved.

According to the application of the difunctional microcapsule in formaldehyde degradation, the difunctional microcapsule is of a core-shell structure, the core is a phase change material, and the shell is a polymer layer containing TiO2 nanoparticles. According to the technical scheme, the photo-generated carrier separation efficiency can be remarkably improved, the durability is enhanced, meanwhile, the inner core part of the microcapsule can further play an energy storage or heat management function, and the dual-function cooperation of photocatalysis and energy regulation and control is achieved.

The invention relates to a preparation method of paper, in particular to a preparation method of formaldehyde removal paper. The efficient formaldehyde degradation catalyst is prepared by doping the nanoscale OMS-2 molecular sieve into the activated carbon fiber raw material and loading the metal silver, the formaldehyde adsorption degradation performance of formaldehyde removal paper is remarkably improved, and the persistence and stability of formaldehyde degradation are ensured by uniformly embedding the molecular sieve into paper pulp. Compared with the traditional method of directly adhering the adsorption and degradation components to the surface of the wallpaper, the formaldehyde removal paper prepared by the invention can more effectively remove formaldehyde in indoor air in long-term use, and provides a healthier and more environment-friendly living environment for residents.

A ceramic-based composite material used for low-concentration formaldehyde degradation, and preparation method therefor belonging to the technical field of environmental engineering. The present invention comprises: utilizing an alkali metal-transition metal (i.e. A-T) alcohol solution mixed at low temperature with a TiO2 sol to obtain an A-T-TiO2 sol; immersing activated ceramic (HFC) into the A-T-TiO2 sol, and stirring at normal temperature to obtain A-T-TiO2 / HFC; subjecting the obtained A-T-TiO2 / HFC to primary drying and primary low-temperature calcination to form A-T-TiO2 / FC; then immersing the A-T-TiO2 / FC into a metal-organic framework (MOF)-amino silane sol to obtain an aminated A-T-TiO2 / MOF / NFC precursor; and finally, subjecting the obtained precursor to secondary drying and secondary low-temperature calcination, forming an A-T-TiO2 / MOF / NFC composite material. The present invention effectively degrades low-concentration formaldehyde in indoor environments or in air. Loading MOF on an aminated ceramic and doping alkali metal significantly improve the formaldehyde enrichment and degradation performance of the composite material, which is beneficial to the thorough removal of low-concentration formaldehyde in indoor environments or in air.

The invention belongs to the technical field of photocatalysts, and relates to a photocatalyst LZMO / OMS-2 and a preparation method and application thereof in formaldehyde degradation, the preparation method comprises the following steps: S1, preparing an LZMO precursor; s2, OMS-2 is prepared; s3, the LZMO precursor and OMS-2 are ground and then calcined, and the photocatalyst LZMO / OMS-2 is prepared. The prepared photocatalyst LZMO / OMS-2 can promote separation of light-excited charges and improve the electron transmission efficiency of the catalyst, so that the light utilization efficiency is improved, the photocatalytic performance is improved, and the photocatalyst has an excellent degradation effect on formaldehyde.

This invention discloses a method for preparing and applying a MnO2 / montmorillonite composite material for catalytic formaldehyde degradation, relating to the field of mineral composite catalytic material preparation technology. The method comprises the following steps: blending montmorillonite with a potassium salt to obtain potassium-based montmorillonite; reacting the potassium-based montmorillonite with potassium permanganate and ammonium oxalate to obtain the MnO2 / montmorillonite composite material. The potassium-based montmorillonite prepared in this application acts as a support and provides a solid potassium source for subsequent reactions; potassium permanganate provides a manganese source; and ammonium oxalate controls and reduces manganese defects in the manganese dioxide crystals, resulting in a manganese-defect-rich MnO2 / montmorillonite composite material. The MnO2 / montmorillonite composite material prepared in this application effectively improves the catalytic activity of the catalyst for formaldehyde oxidation at room temperature and reduces the cost of material preparation and application.

The invention discloses a preparation method of a photocatalytic material Bi / Bi2MoO6 / BiOBr for indoor formaldehyde degradation, which comprises the following steps: respectively dissolving bismuth nitrate and sodium molybdate in ethylene glycol to prepare a bismuth nitrate solution and a sodium molybdate solution; the preparation method comprises the following steps: dropwise adding a sodium molybdate solution into a bismuth nitrate solution to prepare a mixed solution, adding ethanol and BiOBr, stirring, carrying out ultrasonic treatment, transferring into a high-pressure reaction kettle, heating to 160 DEG C, keeping for 12 hours, and drying a product to obtain Bi2MoO6 / BiOBr; and dissolving Bi2MoO6 / BiOBr in water, carrying out ultrasonic treatment, adding a sodium borohydride solution, stirring, washing with water, centrifuging, and drying the product to obtain Bi / Bi2MoO6 / BiOBr. According to the preparation method of the photocatalytic material Bi / Bi2MoO6 / BiOBr, a simple hydrothermal method and a sodium borohydride reduction method are adopted, and the formed ternary photocatalyst has an excellent degradation effect on gaseous formaldehyde.

The invention belongs to the technical field of high polymer materials, and particularly relates to an in-vehicle aldehyde substance purification filler based on a coordination polymer and a preparation method. The in-vehicle aldehyde substance purification filler comprises an aldehyde targeting coordination polymer and a carrier with a purification function, and the aldehyde targeting coordination polymer is loaded on the carrier with the purification function. According to the technical scheme, the purification efficiency of the in-vehicle aldehyde substance purification filler based on the coordination polymer is remarkably improved, through precise molecular design of the aldehyde targeted coordination polymer, the specific pore diameter of the aldehyde targeted coordination polymer is highly matched with the molecular size of formaldehyde and acetaldehyde, and selective adsorption of aldehyde substances is achieved. Metal active sites Cu or Zn in the coordination polymer can catalyze aldehyde molecules to be subjected to oxidative degradation reaction, the highest formaldehyde degradation rate within 6 hours reaches 88.6%, the acetaldehyde degradation rate reaches 84.2%, and the equilibrium adsorption capacity reaches 22.5 mg / g and is 2.5 times or above that of a traditional mineral adsorption material.

The present invention provides a composite material NaFeS2 / ZnO for efficient formaldehyde degradation under visible light catalysis and a preparation method thereof, belonging to the field of air purification, and aims to solve the problem of low catalytic performance resulting from low sunlight utilization rate and wide band gap of current photocatalysts. The method comprises: step 1, using Fe(NO3)3·9H2O and Na2S·9H2O as reactants, and preparing NaFeS2 by a hydrothermal synthesis method; step 2, mixing a ZnSO4·7H2O solution and a Na2CO3 solution in a molar ratio of 1-3:1, stirring and mixing at room temperature to obtain a precipitate, washing, separating, and drying the precipitate to obtain a precursor Zn5(OH)6(CO3)2; and calcining the precursor Zn5(OH)6(CO3)2 and the NaFeS2 in a molar ratio of 1:100 at 300°C for 2h to obtain the NaFeS2 / ZnO.

The invention relates to the field of rare earth-based catalyst production, in particular to a preparation method and equipment of a formaldehyde degradation catalyst based on a rare earth metal matrix, and the equipment comprises an oil bath pan, a driving motor, a circulating assembly, a reciprocating plate and a mixing assembly; a heating wire is installed at the bottom of the oil bath pan, a placing plate is arranged above the heating wire and located at the lower end of the oil bath pan, an adjusting chamber is formed in the inner wall of the oil bath pan, a driving motor is installed in the adjusting chamber, a circulating assembly is arranged above the driving motor, and a reciprocating plate is arranged on the circulating assembly. The driving motor drives the reciprocating plate to slide up and down through the circulation assembly, and then oil circulation is achieved. A mixing assembly is arranged on the inner side of the circumference of the circulating assembly, when the reciprocating plate slides up and down, the reciprocating plate promotes oil liquid to flow through the mixing assembly, circulating flowing of the oil liquid is achieved through rotating motion, the overall uniformity of the oil liquid temperature is guaranteed, and the reaction efficiency and quality are guaranteed.

The invention relates to the technical field of industrial wastewater treatment, in particular to a catalysis-ultrasonic synergistic treatment process and system for targeted degradation of formaldehyde in wastewater, and is used for solving the problems of no selectivity, high energy consumption, weak impact resistance and poor long-period stability of high-concentration formaldehyde wastewater treatment in related technologies. The system comprises a reactor main body, a catalyst unit, an array ultrasonic unit, an intelligent regulation and control unit and an auxiliary unit, and all the units form a full-closed-loop integrated processing system of data acquisition, prediction calculation, instruction execution and feedback correction through structural assembly linkage and signal transmission cooperation. The technical problems of unstable formaldehyde degradation efficiency, high energy consumption, weak impact resistance and poor adaptation to extreme working conditions in the prior art can be solved in modes of two-dimensional partition adaptation, dual-drive cavitation coordination, intelligent closed-loop regulation and unit integrated coordination.

The present application belongs to the technical field of environmental pollution microbial treatment, and discloses a formaldehyde degradation composite agent, a formaldehyde removal device, a preparation method and application. The preparation method of the formaldehyde degradation composite agent provided by the present application comprises: activating and culturing a formaldehyde degradation strain with an activation culture solution to obtain an activated strain; S2, mixing the activated strain with a treatment solution A to obtain a mixed solution; adding the mixed solution into a treatment solution B for forming treatment to obtain the formaldehyde degradation composite agent; wherein the activation culture solution comprises 0.1-5 mu g / L of potassium sulfite and 5-10 mg / L of carrageenan oligosaccharide, the treatment solution A comprises polyvinyl alcohol, sodium alginate and carrageenan, and the treatment solution B comprises 0.15-0.5% (w / v) of boric acid and 1-3% (w / v) of calcium chloride. The formaldehyde degradation composite agent prepared by the method provided by the present application has excellent degradation effect on formaldehyde pollution of different concentrations, and has wide application prospect.

The invention discloses a method for in-situ construction of a Co (OH) 2 / Co3O4 heterojunction material through hydrothermal temperature regulation and control and application of the Co (OH) 2 / Co3O4 heterojunction material in indoor formaldehyde purification, belongs to the technical crossing field of material preparation and volatile organic compound purification, and aims at solving the problems that an existing cobalt-based photocatalytic material is complex in preparation process, insufficient in catalytic performance and poor in stability. Phase change from Co (OH) 2 to Co3O4 and heterojunction in-situ construction are achieved through single hydrothermal temperature variable regulation and control, specifically, a precursor suspension is subjected to a hydrothermal reaction for 48 h at 410-470 K, the Co (OH) 2 / Co3O4 composite heterojunction material with the controllable surface hydroxyl content is obtained, the heterojunction can enhance the visible light absorption capacity of the material, separation and migration of photo-induced electrons and holes are effectively promoted, and the visible light absorption capacity of the material is improved. Therefore, the photocatalytic reaction efficiency is obviously improved; wherein a CC150 sample (Co (OH) 2 is a main phase) prepared by 423K has a degradation rate of 99.15% and a mineralization rate of 99.59% for 200ppm formaldehyde within 11min under visible light, the activity is not attenuated after continuous operation for 6.5 h, and the CC150 sample has broad-spectrum degradation capability for toluene, benzene and the like. The method is simple in process, low in cost, excellent in material performance and high in stability, can be widely applied to indoor formaldehyde treatment, has important application prospects in the aspects of decoration pollution treatment and indoor air quality improvement, and has extremely high practical value.

The preparation method comprises the following steps: firstly, grafting polyether amine on the surfaces of inorganic nanoparticles, compounding the polyether amine with polyamide with flexible long-chain alkyl and a polyformaldehyde matrix, and preparing the heat-stable toughened polyformaldehyde by taking isocyanate as a reactive compatibilizer, through the reaction of isocyanate groups with polyether amine amino groups, polyamide amino groups and polyformaldehyde terminal hydroxyl groups, the interface interaction and compatibility among the components are improved, and inorganic nanoparticles and polyamide molecules are promoted to be uniformly dispersed in a polyformaldehyde matrix; the polyformaldehyde / flexible polyamide / flexible polyether amine molecular entangled network and the nano cross-linked network between the polyformaldehyde / flexible polyamide / flexible polyether amine molecular entangled network and the inorganic nano particles are formed, the reinforcing and toughening effects on a polyformaldehyde matrix are achieved, and the effect of the polyamide formaldehyde absorbent is achieved by utilizing the reaction of polyamide amido and formaldehyde generated by degradation of polyformaldehyde; meanwhile, the inorganic nanoparticles also have the effect of absorbing formic acid generated by degradation of the polyformaldehyde, so that the thermal stability of the polyformaldehyde is favorably improved.

The utility model discloses an air formaldehyde treatment device, which belongs to the field of formaldehyde purification equipment and is used for solving the problems that the formaldehyde content is gradually increased and the formaldehyde treatment effect and efficiency are gradually reduced when the existing spraying liquid is used for treating formaldehyde. The spraying device is internally provided with a spraying cavity and a solution cavity from top to bottom in sequence, the solution cavity and the spraying cavity are used for containing spraying liquid, the bottom of the spraying cavity is used for inputting to-be-treated air, the top of the spraying cavity is provided with a spraying mechanism used for spraying the spraying liquid to the to-be-treated air, and the spraying cavity is used for outputting the sprayed air; the immobilization column comprises a shell, a formaldehyde degradation device and a filtering device. The air formaldehyde treatment device disclosed by the utility model can be used for carrying out formaldehyde degradation treatment on the spraying liquid and reducing the formaldehyde content in the spraying liquid and the air, so that the formaldehyde treatment effect and efficiency are improved.

The preparation method comprises the following steps: firstly, taking a PET (Polyethylene Terephthalate) film as a base material, and compounding medical non-toxic acrylate coating glue on the surface of the PET film; secondly, bonding a nano carbon nitride sol-gel film on a base material, spraying a CaO solution, and drying; and finally, sequentially growing the three molecular sieve crystals on the surface of the carrier to form a film. The molecular sieve aperture and the specific surface area of the adsorption layer are sequentially decreased from outside to inside, a polymolecular layer with a long and narrow pore channel is formed, diffusion of formaldehyde gas molecules in the polymolecular layer is facilitated, and the efficient and accurate adsorption effect is achieved through strong coulomb force. The adopted nano carbon nitride has a visible light response function and can degrade formaldehyde into carbon dioxide and water, and the added nano calcium oxide can well adsorb photocatalytic products (carbon dioxide and water), so that the adverse effect of competitive adsorption between water vapor and formaldehyde particles caused by the strong hydrophilicity of a molecular sieve is eliminated, and the formaldehyde adsorption effect is improved. Therefore, the benefit of efficient and sustainable use is achieved.

The invention relates to a spongy composite membrane material based on a micro-flower-shaped catalyst. The catalyst can effectively remove a trace amount of indoor formaldehyde gas. The composite film material is composed of Pt (at) delta-MnO2 (at) MnCo2O4 micro-flower-shaped catalyst particles and a spongy conductive cotton film. By applying tiny voltage to the composite membrane catalyst, the indoor trace formaldehyde gas can be effectively removed through room-temperature catalytic reaction without illumination activation, so that the indoor formaldehyde concentration reaches the safe concentration range specified by the national standard GB / T 18883-2022. The catalyst has the characteristics of no need of activation and sustainable use, and solves the problem of environmental pollution caused by continuously releasing formaldehyde building decoration materials.

The present invention provides a method for preventing deformation of a Chinese fir core ecological board, belonging to the technical field of wood boards. After the Chinese fir core ecological board is modified by a silane coupling agent, it is immersed in an aqueous dispersion of a water-absorbing and insect-proof nano-molecular sieve for 5-7 days, taken out and dried. After the Chinese fir core ecological board of the present invention is modified by a silane coupling agent, it promotes the uniform distribution and stable fixation of the water-absorbing and insect-proof nano-molecular sieve inside the Chinese fir core ecological board. It has rich pores, good water absorption performance, can release anti-insect and antibacterial active substances for a long time, and has good photocatalytic antibacterial, formaldehyde degradation, VOCs degradation and other characteristics, so that the treated Chinese fir core ecological board can remain unchanged for a long time, and is more environmentally friendly, safe and of better quality, and has broad application prospects.

The application belongs to the technical field of photocatalysts, and discloses a CdIn2S4Sv / Bi2O3 composite material and a preparation method and application thereof. Bi2O3 nanofibers are synthesized by controlling calcination after electrospinning, serving as an ideal substrate for subsequent growth of CdIn2S4Sv, and then CdIn2S4Sv and CdIn2S4Sv / Bi2O3 are synthesized by a simple oil bath method. The composite material exhibits significant photocatalytic performance in the production of hydrogen peroxide without a sacrificial agent in pure water, and the production rate is much higher than that of original CdIn2S4Sv, Bi2O3 and most reported S-scheme heterojunctions. In addition, the composite material realizes efficient degradation of formaldehyde, and exhibits potential for multifunctional application. The application establishes a comprehensive design paradigm, integrating interface chemical bonding, defect engineering and heterojunction structure, to realize advanced photocatalytic application.