9 results about "Ultrapure water" patented technology

The invention relates to a preparation method of a graphite sheet surface chemical plating iron-nickel alloy layer. The preparation method comprises the following steps of 1, carrying out degreasing treatment on a graphite sheet; 2, carrying out oxidation treatment on the graphite sheet subjected to degreasing treatment; 3, carrying out the following sensitized treatment on the graphite sheet by utilizing a stannous chloride solution; 4, carrying out activating treatment on the graphite sheet by utilizing a palladium chloride solution; 5, sequentially adding 8-10 parts of C6H5Na3O7.2H2O powder, 4-5 parts of NH4Cl2 powder, 3-6 parts of FeSO4.7H2O powder, 2-3 parts of NiSO4.6H2O powder and 2-4 parts of NaH2PO2.H2O powder into ultra-pure water according to the mass ratio so as to fully dissolve the powder, adopting a NaOH aqueous solution as a pH adjustment solution, and dropwise adding the pH adjustment solution with the pH being controlled in a range of 9-9.5 to prepare a plating solution for surface chemical plating of the graphite sheet; 6, carrying out chemical plating treatment on the graphite sheet subjected to preliminary treatment. The preparation method is convenient in manufacturing and simple in process, and a compact and uniform plating layer with controllable thickness can be obtained on the surface of the graphite sheet.

The invention provides a 3D-printed xanthan glue gel scaffold. The scaffold is prepared by the following steps: S1, dissolving xanthan gum in ultrapure water at normal temperature to prepare a xanthangum aqueous solution, adding methacrylic anhydride, performing full stirring, adjusting the pH value of a system to 8-10, continuing reaction for 3-5 hours, and dialyzing and freeze-drying the solution to obtain xanthan gum methacrylate; and S2, dissolving the xanthan gum methacrylate in sterile PBS solution containing a photoinitiator to prepare sol in a sterile environment, uniformly mixing thesol and cartilage cells, performing extrusion printing by using a 3D biological printer to form the scaffold, and irradiating the scaffold with ultraviolet light for cross-linking so as to obtain the3D-printed xanthan glue gel scaffold. The invention also provides a preparation method of the 3D-printed xanthan glue gel scaffold. According to the 3D-printed xanthan glue gel scaffold provided by the invention, the mechanical property is adjustable, the shape and the microstructure are controllable, the biocompatibility is good, and the scaffold can be compounded with cartilage cells.

In a water treatment method, raw water supplied from a water supply reservoir for reserving the raw water is biologically treated by a biological treatment means before being supplied to a primary pure water apparatus. Thereafter, urea or a urea derivative and/or an ammoniacal nitrogen source (NH₃—N) are added before the biological treatment means. In such a treatment flow, it is preferred that a reduction treatment means is provided after the biological treatment means and before the primary pure water apparatus. According to the water treatment method, the TOC, in particular urea, in the raw water can highly be decomposed.

The invention discloses preparation of a water-soluble metal-organic framework composite material and application thereof in detecting the concentration of fluorine ions in water. The preparation comprises the following steps of: preparing a urea solution; adding aluminum trichloride into ultrapure water, carrying out ultrasonic treatment until the aluminum trichloride is completely dissolved, adding 2-aminoterephthalic acid under a stirring condition, and stirring until the 2-aminoterephthalic acid is completely dissolved to obtain a mixed solution; slowly dropwise adding the urea solution into the mixed solution, and stirring to obtain a reaction solution; carrying out heat preservation after the reaction solution is heated, cooling, centrifuging, washing precipitates, and carrying out centrifugal separation to obtain a first product; and dispersing the first product into N, N-dimethylformamide, stirring, carrying out centrifugal separation to obtain a second product, dispersing thesecond product into methanol, stirring, carrying out centrifugal separation, and carrying out vacuum drying to obtain the water-soluble metal organic framework composite material. The composite material is used for detecting the fluorine ion concentration in water. The fluorescent probe prepared by the preparation method has a nanosheet microstructure, is easy to store, and has excellent solubility and good stability in water.

The invention discloses a method for preparing a magnetic hybridized microsphere adsorption material for sewage treatment. The method comprises the steps: dissolving ferric nitrate and cobalt nitratein deionized water, adding modified attapulgite hybridized microspheres, carrying out uniform stirring and mixing, carrying out a heated refluxing reaction, and carrying out centrifugation, washing and baking, so as to obtain modified attapulgite-cobalt iron oxide magnetic hybridized microspheres; adding 2-methylimidazole and hollow zinc oxide microspheres into methanol, carrying out a stirred-mixed dissolution reaction, carrying out centrifugal separation and washing, and carrying out drying, so as to obtain zinc oxide composite microspheres; and adding cetyl trimethyl ammonium bromide, ultrapure water, anhydrous ethanol and ammonia water into nano ferroferric oxide, carrying out ultrasonic dispersion, then, dropwise adding tetrabutyl titanate, carrying out ultrasonic treatment, adding sunflower powder, carrying out magnetic stirring, carrying out magnetic field separation, then, carrying out washing, carrying out dispersing in acetone, carrying out heated refluxing stirring, carryingout magnetic field separation, carrying out alcohol washing, then, carrying out drying, carrying out heating-up treatment in a tubular furnace, carrying out cooling, and then, carrying out mixed ball-milling with the modified attapulgite-cobalt iron oxide magnetic hybridized microspheres and the zinc oxide composite microspheres, thereby obtaining the magnetic hybridized microsphere adsorption material.

The invention discloses a control method for effectively achieving rotation and spraying in a single wafer cleaning process, and relates to the technical field of wafer cleaning, and the method comprises the steps: S1, providing a wafer and a wafer bearing platform, clamping the wafer, enabling the wafer to be located on the wafer bearing platform, and then driving the wafer to rotate through the wafer bearing platform; s2, providing a first chemical cleaning solution, and uniformly spraying the first chemical cleaning solution on the surface of the wafer through reciprocating swing of a first spraying assembly; s3, providing a first ultrapure water cleaning solution, and spraying the first ultrapure water cleaning solution on the surface of the wafer through compound swing of a second spraying assembly; and S4, providing a drying solvent, spraying the drying solvent through a third spraying assembly, and covering the surface of the wafer with the drying solvent. According to the invention, the adhesive force between the cleaning fluid and the wafer surface can be increased, the reaction between the cleaning fluid and the wafer surface is more thorough, and impurities on the wafer surface can be gathered and removed, so that the impurities can be effectively removed.

The invention discloses an ultrapure water ion column waste crusher. According to the technical scheme, the ultrapure water ion column waste crusher comprises a rack, and the rack is provided with a material conveying device used for conveying filter waste particles and a crushing mechanism used for crushing the filter waste particles; the crushing mechanism comprises a main shaft rotationally connected to the rack, a crushing hammer arranged on the main shaft and used for crushing filter waste particles, a first driving assembly arranged on the rack and used for driving the main shaft to rotate, a shaft sleeve structure arranged on the main shaft in a sleeving mode and rotating relative to the rack, a rotating disc arranged on the shaft sleeve structure and corresponding to the crushing hammer, and a second driving assembly arranged on the rack and driving the shaft sleeve structure to rotate. The rack is provided with a feeding channel for filter waste particles in the material conveying device to enter the rotating disc. The crushing efficiency of waste particles of the filter is improved through reverse rotation of the crushing hammers and the rotating disc, the rotating disc is of an annular structure, the length of the impact plate can be increased, and the efficiency of crushing the waste particles of the filter is further improved.