13 results about "Gaseous formaldehyde" patented technology

The invention discloses a preparation method of a novel nitrogen-rich carbon nitride photocatalyst and an application of the novel nitrogen-rich carbon nitride photocatalyst in rapid removal of indoor formaldehyde, and belongs to the technical field of preparation methods of catalysts, 3-amino-1, 2, 4-triazole and molten salt are used as raw materials for copolymerization synthesis of an asymmetric carbon nitride material, cyano groups and hydroxyl groups are successfully introduced, and under visible light, the nitrogen-rich carbon nitride photocatalyst can be used as a catalyst for rapid removal of indoor formaldehyde. The degradation efficiency of gaseous formaldehyde with the concentration of 3 ppm can reach 90%, the performance is far higher than that of a sample without molten salt treatment, in addition, the technology also has considerable degradation activity on formaldehyde with the concentration of 8 ppm, and the degradation activity reaches 52%.

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 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 application provides a preparation method of a composite aerogel with room-temperature aldehyde-removing and sterilization functions, and the aerogel is a graphene composite aerogel loaded with silver-manganese dioxide. The composite aerogel has a three-dimensional porous structure, which provides a physical adsorption space for capturing gaseous formaldehyde. The loading of silver-manganese dioxide provides a chemical oxidation site for catalytic degradation of formaldehyde. The composite aerogel not only realizes the function of efficiently degrading gaseous formaldehyde at room temperature, but also has good antibacterial and sterilization effects. In the application, divalent manganese salt and persulfate are reacted under alkaline conditions to obtain manganese dioxide (delta type), which is used as a carrier. Silver ions are in-situ generated into silver particles under the action of a reducing agent citrate, and then silver-modified manganese dioxide is obtained. The obtained silver-manganese dioxide is fully mixed in a graphene oxide dispersion liquid, and a composite hydrogel is obtained after hydrothermal reaction. The graphene composite aerogel loaded with silver-manganese dioxide can be obtained after freeze-drying.

This invention discloses a paper-based sensor modified with a metal-organic framework (MOF) exhibiting aggregation-induced emission (AIE) and its application in formaldehyde detection. The paper-based sensor is prepared by in-situ growth of an AIE on a paper substrate. The AIE is formed by complexing zinc chloride with tetra(4-pyridinebiphenyl)ethylene in a mixed solvent of tetrachloroethylene and methanol. This paper-based sensor features low cost, minimal environmental pollution, small size for handheld use, and high stability. It can detect volatile formaldehyde using both fluorescence and chemiluminescence methods, exhibiting high sensitivity, a wide linear range, and rapid response. This not only provides a new approach for the real-time detection of gaseous formaldehyde but also enriches and expands the application of AIE-modified MOFs on paper substrates.

The present application belongs to the technical field of formaldehyde detection, and particularly relates to a hydrazinyl naphthalimide functionalized pillar[5]arene, a supramolecular assembly, a thin film sensor and a preparation method and application thereof. The hydrazinyl naphthalimide functionalized pillar[5]arene provided by the present application takes a pillar[5]arene with a specific cavity as a skeleton, and hydrazinyl naphthalimide is used as a fluorescent detection group, which can detect formaldehyde and recognize specific guest molecules to form a supramolecular assembly. The supramolecular assembly provided by the present application has good stability in liquid and solid modes, has a low detection limit, a short response time and is convenient to use, and can be used to make a thin film sensor which is convenient to carry and use. The thin film sensor can be used for gaseous formaldehyde detection and recognition.

The application provides a MnO2-RGO-BiOBr composite photocatalyst, a preparation method thereof and application thereof in degrading gaseous formaldehyde, and belongs to the technical field of formaldehyde catalytic degradation. The MnO2-RGO-BiOBr composite photocatalyst is composed of BiOBr, RGO and delta-MnO2, the mass ratio of the BiOBr in the MnO2-RGO-BiOBr composite photocatalyst is 50%, and in the photocatalytic degradation of formaldehyde, the synergistic mechanism of delta-MnO2 and BiOBr, the efficient separation efficiency of photo-generated electrons and holes, the photocatalytic performance of the composite material, the strong adsorption property of the three-dimensional structure, the capture and enrichment of low-concentration gaseous formaldehyde, the contact probability of the gaseous formaldehyde and the composite material, and the oxidation degradation efficiency are all improved.

The application provides a BiOI with iodine defects 1‑x Rod-like material, preparation method and application thereof. Bismuth nitrate pentahydrate and 1,3,5-benzene tricarboxylic acid are added into methanol in proportion, and a metal organic framework [Bi9(C9H3O6)·9(H2O)9] is synthesized by heating at 100-140 DEG C for 20-24 h; the metal organic framework is mixed with ammonium iodide in proportion, and then is subjected to water bath at 60-100 DEG C for 0.5-1.5 h to derive rod-like BiOI; the obtained BiOI is calcined in a muffle furnace at 350-450 DEG C to obtain the rod-like BiOI material with iodine defects, which is represented as BiOI 1‑x . The material has the rod-like microstructure of the precursor [Bi9(C9H3O6)·9(H2O)9], the axial size is slightly reduced, the diameter of the rod is about 1-2 microns, the length is about 3-8 microns, the surface is rough, and the material has a porous structure. The material can be used as a photocatalyst for degradation of gaseous formaldehyde and liquid tetracycline, and both have excellent degradation performance.

This invention belongs to the field of environmental functional materials technology, and provides a self-healing, regenerable photocatalytic coating for environmentally toxic substances and its preparation method. The invention uses fluorinated polyurethane as the continuous phase, introduces reversible bonding units, and constructs a dynamic polymer network with photothermal triggering self-healing capabilities. The coating is loaded with a heterojunction composed of nitrogen-doped carbon quantum dots and bismuth tungstate, and a silica shell inhibits catalyst surface poisoning and deactivation. Furthermore, titanium carbide-based two-dimensional materials are used as conductive and photothermal aids to effectively accelerate the separation and migration of photogenerated carriers, while simultaneously generating a mild localized temperature rise under illumination, promoting the reversible bond breaking and recombination in the polyurethane network, achieving in-situ self-healing of microcracks and photo-etching damage in the coating. Additionally, the coating surface is endowed with selective enrichment and self-cleaning capabilities. The coating of this invention can maintain stable adhesion and continuous catalytic activity under long-term illumination and complex pollution environments, and has a continuous degradation capability for environmentally toxic substances such as gaseous formaldehyde.

The invention provides a silver-method formaldehyde production process, and belongs to the field of organic synthesis. By adopting the technical scheme that the methanol is pumped into the evaporator through the methanol pump, the methanol enters the evaporator through pressure boosting of the Roots blower, the methanol heat exchange plate exchanger, the gas distribution cylinder and the like, efficient evaporation of methanol and effective recovery of heat are realized, unit consumption of methanol is remarkably reduced, and production efficiency is improved; by arranging the three absorption towers and adopting a circulating absorption technology, the temperature of gaseous formaldehyde is effectively reduced, so that the production of 37% high-concentration liquid formaldehyde is realized, the formaldehyde concentration is improved, the content of methanol in a formaldehyde product is reduced, and the production cost is remarkably reduced; and a soft water storage tank circulating pump system and accurate flow control are adopted, so that accurate material supplementation of the third absorption tower is realized, reasonable addition of water in the absorption process is ensured, and the purposes of diluting formaldehyde and stably outputting formaldehyde on the same set of equipment are achieved.

The application discloses a kind of based on solvent load belt volatile gaseous formaldehyde purifying agent, system and method, the gaseous formaldehyde purifying agent is homogeneous liquid mixture, including gaseous formaldehyde capture agent and core load solvent;With the total mass of the gaseous formaldehyde purifying agent as 100%, the mass ratio of gaseous formaldehyde capture agent is 5%-20%, and the mass ratio of the core load solvent is 75%-95%;The core load solvent is high-boiling point organic solvent with boiling point between 150 DEG C to 300 DEG C;The gaseous formaldehyde capture agent contains active group with the ability of nucleophilic addition reaction with formaldehyde.The gaseous formaldehyde purifying agent of the application has the advantages of uniform volatilization, safety and non-toxic, and can efficiently remove formaldehyde in air.

The invention belongs to the technical field of environmental functional materials, and provides a self-repairing renewable photocatalytic coating aiming at environmental toxicants and a preparation method of the self-repairing renewable photocatalytic coating. According to the invention, fluorine-containing polyurethane is taken as a continuous phase, a reversible bonding unit is introduced, and a dynamic polymer network with photo-thermal triggered self-repairing capability is constructed; heterojunctions formed by nitrogen-doped carbon quantum dots and bismuth tungstate are loaded in the coating, and surface poisoning and inactivation of the catalyst are inhibited through a silicon dioxide shell layer. Furthermore, a titanium carbide two-dimensional material is used as a conductive and photo-thermal auxiliary agent, so that separation and migration of photon-generated carriers are effectively accelerated, mild local temperature rise is generated under illumination, breakage and recombination of reversible bonds in a polyurethane network are promoted, and in-situ self-repairing of coating microcracks and light etching damage is realized; in addition, the coating surface is endowed with selective enrichment and self-cleaning capability; the coating provided by the invention can keep stable adhesion and continuous catalytic activity under long-term illumination and complex pollution environments, and has continuous degradation capability on environmental toxicants such as gas-phase formaldehyde and the like.

The invention provides a MnO2-RGO-BiOBr composite photocatalyst, a preparation method of the MnO2-RGO-BiOBr composite photocatalyst and application of the MnO2-RGO-BiOBr composite photocatalyst in degradation of gaseous formaldehyde, and belongs to the technical field of catalytic degradation of formaldehyde. The MnO2-RGO-BiOBr composite photocatalyst is prepared from BiOBr, RGO and delta-MnO2, the mass ratio of the BiOBr in the MnO2-RGO-BiOBr composite photocatalyst is 50%, the BiOBr is derived from a synergistic mechanism of the delta-MnO2 and the BiOBr in formaldehyde photocatalytic degradation, the efficient photo-induced electron and hole separation efficiency improves the photocatalytic performance of the composite material, meanwhile, a three-dimensional structure exerts the strong adsorption characteristic, and the photocatalytic performance of the composite material is improved. The low-concentration gaseous formaldehyde can be captured and enriched, and the contact probability of the formaldehyde and the composite material is obviously improved, so that the oxidative degradation efficiency is enhanced.