306 results about "Methyl blue" patented technology

The invention provides a preparation method and application of an adsorbent. The preparation method comprises the following steps: grafting amido to the tail end of cyclodextrin, and then adding the cyclodextrin and polyacrylic acid to a graphene oxide dispersion liquid for reaction; preparing a surface grafting graphene oxide nanocomposite material through a one-step method, wherein the surface grafting graphene oxide nanocomposite material can fast and effectively treat dye wastewater and especially absorb methylene blue. The adsorbent prepared through the method provided by the invention has the advantages of property of forming clathration with a dye molecule by sufficiently utilizing a cyclodextrin molecule, large specific area of a nanometer material and a high-molecular material, abundance of oxygen-containing functional groups, good water solubility of the high-molecular material, abundance of hydroxy and carboxyl and the like and is capable of fast and effectively treating the dye wastewater by generating electrostatic attraction effect with a cationic dye by concentrating functional group carboxyl on the surfaces of the nanometer material and the high-molecular material; and the adsorbent prepared through the method provided by the invention is capable of fast and effectively treating the dye wastewater because the functional groups, namely the hydroxy, the carboxyl and the like, easily form hydrogen bonds with a water molecule.

The invention discloses a hydrophilic / hydrophobic transition polyelectrolyte / titanium dioxide composite nanofiltration membrane and a preparation method thereof, and belongs to the technical field of membranes. According to the key technology, PDDA-TiO2 nano particles, cationic polyelectrolyte and anionic polyelectrolyte are utilized, ultrafiltration membranes such as polysulfone and polyacrylonitrile serve as supporting base membranes, and the composite nanofiltration capable of conducting hydrophilic / hydrophobic intelligent transition is prepared by adopting the method of combining ion exchange and electrostatic layer-by-layer self-assembly. The method is easy to operate and is a green preparation method, and the obtained composite nanofiltration membrane is even in structure; meanwhile, the prepared hydrophilic / hydrophobic transition composite nanofiltration membrane can be used for removing water and dye, such as xylenol orange and methyl blue, of an organic solvent system, and a good application effect is achieved.

The invention discloses a CuO ball, a preparation method and a use thereof, as well as a visible light catalyst and relates to a CuO nanostructure. The preparation method is as follows: mixing a copper salt water solution, ammonia water and a sodium alginate water solution, wherein the volume ratio of the copper salt water solution to the ammonia water is 10: 0.5-10: 5, and the volume ratio of the copper salt water solution to the sodium alginate water solution is 2: 1-1: 2; and reacting for 1-24 hours under hydrothermal conditions at the temperature of 100-180 DEG C. The CuO can have two structures, namely the solid structure and the hollow structure according to different reaction time. The CuO solid ball and the CuO hollow ball, disclosed by the invention, can be used for visible light catalytic degradation of organic dyes, in particular to the visible light catalytic degradation of methyl blue.

The invention relates to a preparation method of high-adsorbability chitosan aerogel. The preparation method comprises the steps of 1, dissolving chitosan in an acidic aqueous solution; 2, cross-linking diluted alpha, beta-unsaturated aldehyde to the chitosan solution to form gel; and 3, washing with deionized water, and freeze-drying to obtain the chitosan gel material. The synthesis method is simple, and the obtained gel material is a functionalized modified chitosan aerogel material, and has the advantages of large adsorption capacity, good adsorption effect, good stability, high reusability and easy separation on anionic dyes, especially methyl blue dyes in wastewater.