19 results about "Toxic chemical" patented technology

The application discloses a kind of positive charge biomass carbon dots and preparation method and application thereof, belong to biomass carbon dot technical field.The application provides a kind of method for preparing nanoscale biomass carbon dots with positive charge using agricultural waste-tomato seedling, and the preparation method is simple and easy to operate, and the equipment requirement is low, material source is extensive, cheap and easy to obtain, no toxic chemical reagent is used, and it is environment-friendly, and the preparation cost is low;A new way for high-value utilization of tomato seedling is provided;The biomass carbon dots prepared are approximately spherical in shape, uniform in size, well dispersed, and have no aggregation phenomenon, with an average diameter of 10 nm and an average potential of +42.03 mV;Good hydrophilicity, strong stability;With blue, green, red and other fluorescent properties.

This invention discloses a diatomaceous earth-based graphene composite aerogel, its preparation method, and its applications. The preparation method includes: preparing a graphene oxide dispersion; pretreating unmodified natural diatomaceous earth; mixing the graphene oxide dispersion with the pretreated diatomaceous earth and then performing a hydrothermal reaction to obtain a hydrogel; freeze-drying the hydrogel to obtain an aerogel precursor; and annealing under an inert atmosphere to obtain the target aerogel. This invention uses unmodified natural diatomaceous earth, avoiding the surface modification steps in traditional processes, simplifying the preparation process, and reducing production costs. Combined with annealing, it eliminates the need for toxic chemical reducing agents, making the process green and environmentally friendly. The resulting composite aerogel possesses both lightweight and structurally stable properties, showing promising application prospects in water treatment, thermal insulation, and electrochemical energy storage.

The application provides a phosphorus modified zero-valent iron catalytic material, a preparation method, a remediation agent and application. 3‑ The phosphorus modified zero-valent iron catalytic material is obtained, wherein the particle size of the zero-valent iron is micron level. The preparation method of the application can be completed in an air atmosphere, and does not need high temperature, vacuum or addition of toxic chemical reagents. The preparation process only involves physical mixing and mechanical ball milling, the equipment requirement is simple, the operation is convenient, the energy consumption is low, the dual benefits of environmental governance and ecological restoration are combined, and the green and sustainable development environmental governance concept is met.

This invention relates to the field of textile processing technology, specifically to a method for preparing hydrophobic PET fabrics via an enzymatic process, and the resulting fabric. The invention pre-activates the surface of the PET fabric using an enzymatic method, followed by an amidation reaction with a long-chain fatty amine in the presence of a condensing agent, constructing a covalently fixed alkyl hydrophobic layer. Compared to traditional surface treatments or coatings using alkalis, the method provided by this invention offers milder processing conditions, eliminating the need for large amounts of toxic chemical reagents. Furthermore, the PET hydrolase used in this method exhibits mild action, high selectivity, and high specificity, preferentially attacking the amorphous regions of PET with minimal impact on the crystalline structure and mechanical properties of the PET fibers. This achieves a balance between surface modification and mechanical properties, which is of significant importance for the subsequent functional finishing of PET fibers.

This invention discloses a method for preparing van der Waals metal thin films. The method includes the following steps: S1, coating a polyvinyl alcohol (PVA) film onto the surface of a supporting substrate; S2, depositing a metal film on the surface of the PVA film to obtain an intermediate; S3, placing the intermediate in water at 60-80°C to remove the PVA film, obtaining a floating metal film; transferring the metal film to the surface of a target substrate, and bonding the two together using van der Waals forces to obtain the final product. This invention utilizes the controllable dissolution properties of PVA, achieving the separation and transfer of the metal film from the supporting substrate using deionized water, avoiding the use of toxic chemical solvents and interface damage caused by high-energy bombardment. The method is simple, environmentally friendly, and can be widely applied to the preparation of van der Waals heterostructures such as metal-semiconductor and metal-insulator structures.

A long-lasting hydrogel for use against drug-resistant bacteria, and a preparation method and use thereof are provided. In the present disclosure, polyvinyl alcohol (PVA) is mainly adopted as a matrix, and phytic acid and honey including glucose and fructose are added to modify the PVA to obtain the hydrogel. During preparation of the antimicrobial hydrogel, no toxic chemical crosslinking agent or initiator is added, and the antimicrobial hydrogel is mainly obtained by crosslinking PVA, phytic acid, and monosaccharides through ester bonds, hydrogen bonds, and electrostatic adsorption. In addition, the hydrogel obtained by adding phytic acid and honey to the PVA matrix exhibits a significant long-lasting antimicrobial effect for Staphylococcus aureus (S. aureus), drug-resistant S. aureus, and Pseudomonas aeruginosa (P. aeruginosa), and the antimicrobial effect can last for about 3 months.

This invention discloses a surface-enhanced Raman spectroscopy (SERS) substrate material, its preparation method, and its applications. The method includes the following steps: S1, extracting and pretreating silk material; S2, immersing the silk material in a chloroauric acid solution; S3, heating and reducing a mixture of silk material and chloroauric acid solution; S4, removing the silk material, washing, and drying to obtain the SERS substrate material. The SERS substrate of this invention significantly improves the detection sensitivity and selectivity for mucin through optimized nanoparticle distribution and porous structure. This invention uses silk fiber waste as a bio-substrate and utilizes sericin and fibroin for in-situ reduction, effectively reducing the use of toxic chemicals and improving the biocompatibility and environmental friendliness of the substrate. The preparation method of this invention is simple, low-cost, suitable for mass production, and convenient for on-site testing in resource-limited environments.

The present application relates to the technical field of drug delivery carrier, and discloses a composite hydrogel microsphere, a preparation method and application thereof.The composite hydrogel microsphere provided by the present application comprises a continuous phase and a dispersed phase dispersed in the continuous phase, the dispersed phase comprises drug-loaded microspheres, the drug-loaded microspheres comprise a drug active ingredient and a carrier, the carrier comprises enzymolysis fibroin fibers, the continuous phase comprises a silk fibroin hydrogel, and the silk fibroin hydrogel comprises silk fibroin and water.The composite hydrogel microsphere has a long-acting slow-release effect, meanwhile, the preparation method of the composite hydrogel microsphere adopts a physical cross-linking mode throughout the whole process, and does not use any toxic chemical cross-linking agent, so that cytotoxicity and inflammatory reactions caused by the residual cross-linking agent are avoided, and the safety is high.

This application discloses a postoperative endometrial protective anti-adhesion repair dressing for uterine cavity surgery. The dressing is a sterile hydrogel preparation comprising gradient cross-linked sodium hyaluronate, recombinant type III humanized collagen, and carboxymethyl chitosan. Therefore, this application uses medical-grade natural genipin to replace toxic chemical cross-linking agents such as BDDE to construct a gradient cross-linked sodium hyaluronate system, which is non-irritating to the uterine cavity mucosa, ensuring the safety of postoperative recovery. By precisely compounding high-molecular-weight and low-molecular-weight sodium hyaluronate and accurately controlling the cross-linking time, the anti-adhesion effect and postoperative repair quality are significantly improved. The gel rheological properties are optimized, resulting in a long retention time in the uterine cavity, excellent uterine cavity adaptability, and a stable and reliable physical barrier function. It integrates anti-adhesion, wound protection, and lubrication protection functions, and adopts a pre-filled uterine cavity-specific pusher design, allowing for immediate use without the need for additional intraoperative configuration, effectively reducing the risk of cross-contamination.

This invention discloses a method for improving the properties of composite gels based on tannic acid crosslinking, belonging to the field of composite gel preparation technology. The method includes five steps: preparing a chia seed gum / fish gelatin mixture, pre-gelation treatment, preparation of the tannic acid crosslinking solution, crosslinking reaction, and gel formation. The concentrations of chia seed gum and fish gelatin are precisely controlled. After stirring at 30-40 °C and pre-gelling at 25 °C, the mixture is crosslinked with a 0.5-2 mg / mL tannic acid solution with a pH adjusted to 6.0-6.5. By replacing traditional toxic chemical crosslinking agents with natural tannic acid, synergistic optimization of process parameters is achieved. The prepared composite gel has a uniform structure, is green and safe, and exhibits excellent thermal stability. Simultaneously, the mechanical properties and water retention of the gel are significantly improved. This invention features a simple preparation process, mild reaction conditions, and easily controllable parameters, making it suitable for large-scale industrialization. The prepared composite gel can be widely used in food preservation, drug carriers, biomedical dressings, and other fields, possessing high practical value and promising market application prospects.

The application discloses a kind of green enzymatic polycondensation synthesis polyamide 6,5 method, with dimethyl glutarate and 1,6-hexanediamine as raw material, using Novozym435 immobilized lipase as biological catalyst, by direct enzymatic polycondensation reaction preparation biobased polyamide 6,5.The method uses toluene as reaction medium, combined with vacuum by-product, molecular sieve water absorption balance control strategy, realizes the green efficient synthesis of polyamide 6,5, product has excellent thermal stability (melting point 221 DEG C, maximum decomposition temperature 434 DEG C), suitable for melt spinning and other industrial processes, compared with traditional chemical synthesis method, greatly reduce energy consumption, reduce the use of toxic chemicals, provide a new way for the green manufacturing of polyamide.

The present application relates to a kind of activated lignin / chitosan synergistically modified soy protein adhesive and its preparation method, belong to biomass adhesive technical field.The adhesive includes soy protein powder, calcium demethylated lignin sulfonate and chitosan, significantly improve bonding strength and mildew resistance by synergistic modification.Calcium demethylated lignin sulfonate introduces o-diphenol structure, and forms dynamic covalent / non-covalent hybridization network with soy protein;Chitosan provides intrinsic antibacterial property.The adhesive preparation process is simple, raw material is all biomass resources, without adding toxic chemical reagent, environmental protection and safety.When applied to plywood preparation, its dry-state bonding strength can reach more than 2.47 MPa, wet-state bonding strength reaches more than 1.49 MPa, and has good mildew resistance in humid environment.The present application is suitable for wood-based panel industry, and has broad market application prospect.

The invention relates the use of a compound comprising an aromatic group comprising at least one nitrogen-containing aromatic ring, which ring bearing at least two substituents, at least one of the substituents of which comprises a double bond conjugated with said ring as a detection indicator for detecting a compound chosen from organophosphorus compounds, sulfide compounds, amine compounds and arsenic compounds.

FIELD: training military personnel.SUBSTANCE: invention relates to training military personnel to act in conditions of chemical contamination. When training in the operation of chemical reconnaissance and control devices that operate in the presence of a simulator, 1,2-propanediol, which has spectral characteristics of reduced ion mobility close to ammonia, is used as a simulator.EFFECT: using a non-toxic and readily available compound, 1,2-propanediol, as a simulant of the toxic chemical ammonia. This simulator can also be used to evaluate the performance of chemical reconnaissance and control devices.1 cl, 1 dwg

The application relates to a kind of toxic chemical wastewater advanced treatment recycling device and process in the technical field of chemical wastewater treatment, comprising a treatment tank, the side top of the treatment tank is connected with liquid inlet pipe for passing wastewater into the inside of treatment tank, the top of the treatment tank is provided with oxidant tank containing oxidant.The application installs multiple filter screens for filtering water on the outer wall of vertical pipe, so that the wastewater flowing into the inside of vertical pipe can filter out the oxidation product therein via filter screen, the liquid moves to the top of water baffle and is finally discharged through liquid discharge pipe, and the oxidation product filtered by filter screen falls into the inside of mud containing cavity under the action of its own gravity, realizing solid-liquid separation, and the rotating column can drive the rotation of mud containing cavity, so that the oxidation product in mud containing cavity can be poured into the bottom end of treatment tank, thereby realizing the extraction of oxidation product without shutdown, ensuring the treatment efficiency of the application for wastewater.

A modular mineral processing apparatus is disclosed for the high-yield recovery of fine gold from high-viscosity, clay-rich slurries without the use of toxic chemical reagents. The apparatus comprises: a rustfree structural enclosure (12) fabricated from corrosion-resistant material housing ሟ vertically oriented, electric motor (3) driven centrifugal concentrator assembly; an internal processing bowl (7) featuring specialized annular riffles with fluidization microapertures configured to generate and sustain a dilated heavy-mineral bed under 8 centrifugal force field of between 60g and 2000; 8 water-jacketed fluidization system (10) delivering controlled upward water flow through the annular riffle micro-apertures to maintain the fluidized bed state; and ዉ precision fluid discharge mechanism incorporating independently operable separation valves (9) for the controlled extraction of the high-density gold-bearing concentrate from the lower-density tailings discharge stream. The apparatus enables fine gold patticles, including sub-100-micron patticles, to displace lower-density silicate gangue material while actively rejecting clay-mineral overflow, thereby producing a clean concentrate suitable for further upgrading.

The application discloses a biocompatible starch-based reference electrolyte resistant to silver ion leakage and a preparation method thereof, and contains the following components in percentage by weight: hydroxypropyl distarch phosphate: 15-25%; xanthan gum: 0.5-1.5%; potassium chloride, the concentration of which in the electrolyte is 3.0-4.5 mol / L; propylene glycol: 5-10%; sodium phytate: 0.1-0.5%; and water for injection, the balance. The application forms a high-osmotic-pressure environment by using high-concentration potassium chloride, and adjusts the water activity of the system by adding propylene glycol, so that a physical antibacterial system is constructed in cooperation, and a toxic chemical preservative such as sodium azide, which must be added in a traditional formula, is completely replaced. The system not only effectively inhibits the growth of microorganisms in the electrolyte gel, but also is food or medical grade, so that the risk of migration of toxic substances to the cell culture solution is eliminated, and the biosafety of a monitoring system in a long-term cell culture process is ensured.