6results about How to "Low ecotoxicity" patented technology

The invention discloses multi-walled carbon nanotube functionalized sludge biochar as well as a preparation method and application thereof. The method comprises the following steps: firstly, mixing sludge biochar prepared by anaerobic pyrolysis with a multi-walled carbon nanotube, and carrying out ball milling treatment, so as to prepare the sludge biochar functionalized by the multi-walled carbon nanotube; the multi-walled carbon nanotube functionalized sludge biochar prepared by the invention can efficiently activate peroxymonosulfate to degrade trace antibiotics in a water body, and the removal rate of sulfamethoxazole can reach 96% when the reaction is carried out for 60 minutes. According to the method, harmless treatment and resource utilization of the sludge can be realized, and meanwhile, efficient removal of antibiotics in the water body is also realized.

This invention discloses a method for preparing and applying an antibacterial composite coating based on quaternized zinc oxide nanoparticles. The preparation method includes: grafting quaternary ammonium salt compounds onto the surface of zinc oxide nanoparticles to prepare synergistic antibacterial nanoparticles; modifying the substrate surface by co-deposition of dopamine and polyethyleneimine to introduce active functional groups; and spraying or dipping the quaternized zinc oxide nanoparticles onto the modified substrate surface to obtain the antibacterial composite coating. This novel antibacterial material preparation scheme can integrate the advantages of zinc oxide nanoparticles and quaternary ammonium salts, while solving key technical problems such as nanoparticle aggregation, weak interfacial bonding, and limited antibacterial efficiency. It is of great significance for promoting the upgrading of hygiene and safety in the fields of medicine, food, and building materials.

The invention provides a copper mine tailing pond in-situ soil construction method. According to the in-situ soil construction method for the copper mine tailing pond, a water retention layer is arranged on the copper mine tailing pond, then a planting layer is arranged on the water retention layer, finally vegetation is planted on the planting layer for regreening, and the water retention layer and the planting layer both comprise two kinds of biogas residues with different water contents. On one hand, by adjusting the content of biogas residues with different water contents and particle sizes in the water retention layer and the planting layer, the water retention capacity of reconstructed soil is improved, the soil hardening phenomenon of the planting layer can be effectively prevented, the survival rate and the growth speed of vegetation are improved, and long-term regreening of the copper mine tailings pond is guaranteed; the characteristics that the organic solid waste biogas residues are rich in organic matter, high in water content and the like are fully utilized, the organic solid waste biogas residues are combined with the inorganic solid waste tailings to conduct in-situ soil construction on the copper mine tailing pond, large-scale utilization of solid waste resources is achieved, and the repairing cost of the copper mine tailing pond is greatly reduced.

The application provides an ethanol-mediated linear RNA-lipid nanoparticle demulsification method, comprising the following steps: performing three demulsifications on an mRNA-lipid nanoparticle sample with an ethanol solution to obtain mRNA precipitation; the concentration of the ethanol solution is 85wt%-90wt%, and the ethanol solution used in each demulsification is reduced in the three demulsifications. The technical scheme of the application significantly reduces the ecological toxicity, is safer, improves the mRNA recovery rate and purity, and can maximize the integrity of the mRNA. In addition, the method is simple to operate, does not require complex experimental operations and special equipment, reduces the operation difficulty and time cost, improves the experimental and production efficiency, and has a wide application prospect.

This application provides a bio-based chain extender and its application. The bio-based chain extender includes the bio-based compounds 2,5-furandicarboxaldehyde dioxime and / or 5-hydroxymethyl-2-furancarboxaldehyde dioxime. Using these as bio-based chain extenders, modified polyurethanes with antibacterial and antifungal properties can be synthesized. This imparts long-lasting, stable, and broad-spectrum antibacterial and antifungal properties to polyurethane materials, eliminating the need for additional antibacterial agents. This avoids problems such as environmental pollution, short antibacterial time, and unstable antibacterial performance caused by antibacterial agent migration during the use of polyurethane materials. In particular, this bio-based chain extender is bio-based, safe, and environmentally friendly, and has a significant effect on the antibacterial and antifungal modification of polyurethane materials, showing broad application prospects in medical materials, public facilities, and health protection.

The invention relates to the technical field of acrylate emulsions, in particular to an environment-friendly acrylate emulsion and a preparation method thereof, and the emulsion comprises the following components: 50-65 wt% of an acrylate monomer mixture; 3-5 wt% of modified starch; 1-2 wt% of sodium oleate; 0.2 to 0.5 wt% of ammonium persulfate; 0.1 to 0.3 wt% of sodium bicarbonate; the modified starch (hydroxypropyl starch) and the sodium oleate are introduced to form a composite emulsification system, so that synergistic interaction is realized. The hydroxypropyl starch forms a net structure in a water phase, and the sodium oleate forms a stable monomolecular layer on an oil-water interface, so that a stable'cage 'structure is jointly constructed, the acrylate monomer is effectively wrapped, and the stability of the emulsion is remarkably improved; the hydroxypropyl starch forms a semi-interpenetrating network structure in a film forming process, and generates physical crosslinking with an acrylate polymer chain, so that the film forming performance is greatly improved. The structure not only accelerates the film forming process, but also effectively prevents the formation of cracks.