410 results about "Dye adsorption" patented technology

The invention relates to a nanometer clay-containing high absorptive hydrogel as well as a preparation method and application thereof. The hydrogel contains an acrylamide monomer M1, a chemical crosslinking agent M2, inorganic nanometer clay M3 and a water soluble biopolymer M4 with use level of 98-50:0-10:2-25:015 in mass percent. The preparation method comprises the following step of: taking M3 as a filler or a reinforcing agent or a physical crosslinking agent and taking M4 as a second component in a water solution to prepare the environmentally-friendly hydrogel with high water soluble dye adsorption property and excellent mechanical property. The method has the advantages of simple and reliable preparation process, no environmental pollution, very strong dye adsorption removal effects and practicability; and the dye adsorption quantity can be adjusted by temperature, pH value, crosslinking degree, dye concentration, nanometer clay or biopolymer variety and use level and a reactant charge ratio. The hydrogel can be used for the fields of weaving and dyeing wastewater treatment, dye adsorption, and the like.

The invention discloses a method for preparing a graphene oxide. The method comprises the following steps of: a) adding concentrated inorganic acid into a sealed reactor, adding graphite powder with stirring, reducing the temperature to the temperature of between 0 and 4 DEG C, and adding potassium permanganate to react for 0.5 to 2 hours; b) heating the obtained reaction system to the temperature of between 60 and 70 DEG C, and standing for 12 to 24 hours; c) adding hydrogen peroxide into distilled water in a volume ratio of 1:10, freezing to obtain ice, transferring the graphite oxide to the distilled water containing the hydrogen peroxide until the ice is completely dissolved, uniformly stirring, performing suction filtration, washing and drying to obtain the graphene oxide. The graphite powder, the concentrated acid and the potassium permanganate serve as raw materials, and the raw materials are low in cost and readily available; NO, NO2 and other toxic gases are prevented from being produced; the reaction temperature is as low as 60-70 DEG C; and the product has high dye adsorption capacity and high industrial application value.

Disclosed herein is a printing medium provided on a base material with a porous ink-receiving layer which comprises, as principal components, an alumina hydrate having a boehmite structure and a binder, wherein when measuring with an ink containing 0.1% by weight of a surfactant, the time required to absorb 30 ng of an ink is 400 milliseconds or shorter, the dye-adsorbing capacity falls within a range of from 900 to 2,000 mg / m2, and the index of dye-adsorbing rate falls within a range of from 0.0 to 5.0.

The invention discloses a preparation method for laminated photo-anode film of dye-sensitized solar cell. A dense film can be prepared by adopting a magnetron sputtering method and a sol-gel spin-coating method, and the quality of the dense film is controlled by controlling magnetron sputtering parameters or the preparation of TiO2 colloid and the rotating speed of spin coating; nano TiO2 grain of small grain diameter (less than 8nm) is formed on the surface of porous nano TiO2 layer film by means of a liquid-phase chemical deposition method; and dye adsorption of the photo-anode film is increased by means of unsaturated bond on the surface of the nano TiO2 of small grain diameter. When the TiO2 photo anode prepared by the method is applied in a dye-sensitized solar cell, the cell has higher photoelectric conversion efficiency and the device has longer service life.

The invention relates to a method for preparing a crosslinked-chitosan-system azo dye wastewater adsorbent. According to the method, the chitosan microsphere adsorbent aiming at azo dye wastewater treatment is prepared by carrying out reversed phase emulsification process and a cross-linking reaction on a microfluidic focusing type chip made from a laboratory-made polymethyl methacrylate (PMMA) material; the chitosan adsorbent prepared by virtue of the method belongs to a micron scale; compared with adsorbents at present, the chitosan adsorbent has the advantages that the specific surface area is larger, the degree of sphericity and the monodispersity are higher, the biocompatibility and the reproducibility of the chitosan adsorbent are guaranteed by virtue of a chitosan matrix, and the dissolving resistance and the swelling resistance of the chitosan adsorbent are improved under acid conditions when relatively high template dye adsorption capacity is guaranteed in a crosslinking process; by testing template dye wastewater methyl orange, the maximal adsorption capacity can reach 65.83mg / g.

The invention relates to a preparation method of a crop straw dye adsorption material. The preparation method is characterized by comprising the process steps of adding straw powder into N, N-dimethylformamide, putting into an ultrasonic cleaning tank to perform ultrasonic treatment for 20-60 minutes at 30-50 DEG C, then adding phytic acid and urea into the system, heating to 50-90 DEG C, reacting for 2-6 hours, then cooling a product to the room temperature, precipitating, washing, drying and crushing to obtain phytic acid modified straw; neutralizing itaconic acid by using NaOH, then adding the phytic acid modified straw, acrylamide, vinyl pyrrolidone and a crosslinking agent, fully stirring for 30 minutes, then gradually heating to 50-60 DEG C, and finally slowly dropwise adding a redox initiator into a polymerization system to initiate a polymerization reaction for 3-5 hours; and after polymerization, precipitating, washing and drying to obtain the crop straw dye adsorption material. The adsorption capacity of the crop straw dye adsorption material to a cationic dye aqueous solution with the initial concentration of 200-2000mg / L is 195-1400mg / g, the decolorization rate of the crop straw dye adsorption material is 55-90%, and the crop straw dye adsorption material can reach adsorption equilibrium after 100-200 minutes of room temperature adsorption, and can be widely applied to the adsorption, separation and purification of cationic dyes, the environmental pollution control of cationic dye wastewater, and the like.

The invention relates to a preparation method of a magnetic polymer dye adsorbent. An improved chemical co-precipitation method is adopted to prepare magnetic nano particles. Then the surface of nano particles is modified by using gamma-chloropropyl trimethoxysilane and polyethyleneimine to obtain polyethyleneimine modified magnetic nano particles. Finally, polyethyleneimine modified magnetic nano particles and functional monomers carry out copolymerization to prepare the magnetic polymer dye adsorbent with a multilayer crosslinking structure and multiple adsorption groups. The saturation magnetization intensity is 3.5 to 15.5 emu / g. The residual magnetism and coercive force are close to zero. The dye adsorbent has para-magnetism and magnetic responsiveness. For a dye water solution with a primary concentration of 100 to 1000 mg / L, the dye adsorption capacity can reach 50 to 600 mg / g; and the adsorption balance is reached within 60 to 150 minutes. After the dye adsorbent is repeatedly used for five times, the dye adsorption capacity exceeds 90% of first adsorption capacity. The dye adsorbent can be applied to dye adsorption separation and dye wastewater pollution treatment.

The invention relates to a beta-cyclodextrin-based nanometer fiber film, a preparation method thereof, and application of the beta-cyclodextrin-based nanometer fiber film to dye adsorption and separation. The nanometer fiber dye adsorption and separation film is prepared by combining the electrospinning technology with the in-situ thermo-crosslinking method. The beta-cyclodextrin-based nanometer fiber film is prepared from body beta-cyclodextrin, crosslinking agent citric acid and polyacrylic acid which plays a role of crosslinking agents while assisting in spinning macromolecules. A crosslinking reaction happens between hydroxide radicals of beta-cyclodextrin and carboxyl of citric acid and polyacrylic acid to form ester bonds, and therefore the ester bonds are connected to form a three-dimensional crosslinked structure. The beta-cyclodextrin-based electrospinning nanometer fiber film obtained through the method can effectively separate positive ion and negative ion mixed solutions; the obtained beta-cyclodextrin-based electrospinning nanometer fiber film is high in recycling capacity. The preparation process is simple and easy to implement, raw materials can be easily obtained, friendliness to the environment is achieved, cost is low, and good application prospects are achieved.

An ink-jet recording liquid using a dye and a pigment, which is excellent in dispersibility and has good printing performance and storage stability, and a process for producing the same are provided. There are provided an ink-jet recording liquid containing a pigment, a dye and a surfactant which are incorporated in an aqueous medium, characterized in that (1) the pigment and the dye at least partly comprise a pigment and a dye reversibly adsorbed thereon without involving a chemical reaction, (2) the dye reversibly adsorbed on the pigment without involving a chemical reaction contains a dye having a dye adsorption shown by the following formula (1) of 0.02 g / g or more, and (3) as the surfactant, a nonionic surfactant and an anionic surfactant coexist; and a process for producing the same.

The invention belongs to the technical field of inorganic composite materials and particularly relates to a preparation method for an MIL-101 composite material based on Keggin type poly-tungstate and a molecule-group porous material, and an application of dye absorption of the MIL-101 composite material. The material is prepared from the Keggin type poly-tungstate, tetramethylammonium hydroxide, terephthalic acid and chromic nitrate which are used as raw materials by adopting a hydrothermal method. The prepared material can be used for adsorbing a cation organic dye; the adsorption rate to methylene blue within short time can be up to 98% and the adsorption effect is obviously higher than that of a pure MIL-101 material and is higher than the adsorption capability of active carbon. The preparation method has the characteristics of being easy and convenient to prepare and rapid and efficient in adsorption; the prepared material has a wide acid-base applicable range, is easy to separate and can be repeatedly used.

The invention discloses a humic acid microsphere as well as a preparation method and application thereof. An isoelectric point of the humic acid microsphere is pH 2, and is negatively charged when pH is more than 2, and the humic acid microsphere is of a quasi-spheral shape with a diameter of 1mm. According to the preparation method, humic acid is fixed on starch to form the fixed microsphere. The humic acid gel sphere is low in cost and environmentally friendly and can be completely biologically degraded; meanwhile, adsorptive property research of the humic acid gel sphere finds that the humic acid gel sphere has very high efficiency in the removal of cationic dyes in waste water as well as very high recovery utilization rate, so that the humic acid gel sphere has wide use in many fields of dye adsorption, water treatment, adsorbents and the like as well as very high practicability.