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697results about How to "Improve adsorption capacity" patented technology

Preparation method of composite separating film filled by interpenetrating polymer network hydrogel

ActiveCN105289316AImprove adsorption capacityGood adsorption and separation performanceOther chemical processesWater contaminantsIonChemistry
The invention discloses a preparation method of a composite separating film filled by an interpenetrating polymer network hydrogel. The preparation method comprises the following steps of firstly, soaking a polymer membrane into a first monomer solution, fetching out, radiating under ultraviolet rays, and crosslinking, so as to obtain a first network gel composite separating film; then, soaking the first network gel composite separating film in a second monomer solution, fetching out, and performing thermal-initiation crosslinking, so as to form the composite separating film filled by the interpenetrating polymer network hydrogel. The composite separating film filled by the interpenetrating polymer network hydrogel has the advantages that the function of adsorbing heavy metal ions is realized; the heavy metal ions in water can be effectively adsorbed in the filtering and separating process; the method is simple, the efficiency is high, the operation is easy, the cost is low, the industrial production is realized, and the property of adsorbing multiple metal ions of copper, lead, mercury, zinc, cadmium, nickel and the like is excellent; the preparation can be used for the treatment of industrial heavy metal sewage, and the removal of heavy metal ions in domestic drinking water.
Owner:ZHEJIANG UNIV

Chitosan controlled release fertilizer microspheres and preparation method thereof

ActiveCN104311253AIncrease surface areaImprove adsorption capacitySolid/semi-solid fertilisersMatrix fertilisersFertilizerUltrasonic oscillation
The invention provides chitosan controlled release fertilizer microspheres and a preparation method thereof. The controlled release fertilizer consists of biodegradable chitosan, polyvinyl alcohol, sodium alginate and a chemical fertilizer. The preparation method comprises the following steps: dissolving chitosan in an acetic acid solution; dissolving the chemical fertilizer and polyvinyl alcohol in the chitosan acetic acid solution; adding an ion crosslinking agent to obtain microspheres; and putting the microspheres in a sodium alginate solution for ultrasonic vibration to form the chitosan controlled release fertilizer microspheres. In the process of crosslinking to form the microspheres, fertilizer molecules are adhered and wrapped in crosslinked network micropores of the chitosan microspheres, so that the solubility and releasing capacity of the fertilizer molecules are changed and nutrients are slowly released along with degradation of the chitosan microspheres. At the same time, a sodium alginate electrolyte membrane is wrapped on the surfaces of the microspheres, thereby reducing the burst release phenomenon of nutrients generated in the initial release stage. The controlled release fertilizer is simple in preparation process, relatively low in cost, environmentally friendly and non-toxic and suitable for industrial production.
Owner:四川天农农资有限公司

Nonwoven fabric lithium ion battery composite diaphragm and preparation method thereof

InactiveCN104835931AImprove adsorption capacityEffective control of current densityCell component detailsElectrospinningFiber layer
The invention relates to a nonwoven fabric lithium ion battery composite diaphragm and a preparation method thereof, the nonwoven fabric lithium ion battery composite diaphragm is provided with a three layer structure successively comprising a nonwoven fabric substrate layer, a nano ceramic layer and an electrostatic spinning nanofiber layer, or is provided with a five layer structure successively comprising a nonwoven fabric substrate layer, nano ceramic layers and electrostatic spinning nanofiber layers, wherein the nano ceramic layers and the electrostatic spinning nanofiber layers are arranged on both sides of the nonwoven fabric substrate layer; the nano ceramic layer and the nonwoven fabric substrate layer are bonded by pre polymer polymerization of nano ceramic layer ceramic powder as a polymerization site and a nonwoven fabric substrate layer contact site under uv irradiation, and the nano ceramic layer and the electrostatic spinning nanofiber layer are bonded by pre polymer polymerization of the nano ceramic layer ceramic powder as the polymerization site and a nano fiber layer contact site under uv irradiation. The nonwoven fabric lithium ion battery composite diaphragm has the advantages of high mechanical strength, high electrolyte retention rate high puncture strength, high diaphragm rupture temperature, uniform pore size distribution and the like, is an ideal power lithium ion battery composite diaphragm.
Owner:DONGHUA UNIV

Fe-Co bimetal multiphase Fenton-like catalyst taking modified sepiolite as carrier and preparation method thereof

The invention discloses a preparation method of a Fe-Co bimetal multiphase Fenton-like catalyst taking modified sepiolite as a carrier, which relates to a preparation method of a catalyst, to solve the problems of narrow effective pH value range, low utilization ratio of hydrogen peroxide and easiness in generation of secondary pollution of iron ions of homogeneous Fenton. The preparation method comprises the following steps: (1) acidizing and activating sepiolite powder to obtain modified sepiolite; (2) preparing a mixed solution of ferric nitrate and cobalt nitrate, and adding urea to obtain a mixed solution; (3) heating the mixed solution and the modified sepiolite in a water bath for reacting, cooling and ageing to obtain a precipitate; and washing with water and drying to obtain a precursor of the catalyst, and calcining to obtain the Fe-Co bimetal multiphase Fenton-like catalyst. When the catalyst prepared in the invention is used, the pH value of water does not need to be regulated, so the range of the pH value is expanded, and the utilization ratio of the hydrogen peroxide is high; and meanwhile, iron ions can be slowly released to realize the synergistic effect of the iron ions and cobalt ions and speed up the reaction, so that organic pollutants which are difficult to biodegrade can be permanently and efficiently removed, and secondary pollution is difficult to cause.
Owner:HARBIN INST OF TECH

Bacteria immobilization particles for water purification and preparation method of bacteria immobilization particles

The invention discloses bacteria immobilization particles for water purification and a preparation method of the bacteria immobilization particles, and belongs to the technical field of water treatment. The preparation method comprises the following steps: preparing a bacteria concentrate through flocculation by utilizing activated carbon, diatomite and a chitosan acetic acid solution; adding diatomite, bentonite, silicon dioxide and a polyvinyl alcohol-sodium alginate mixed solution into the concentrate for stirring; carrying out granulation with a granulator to prepare the bacteria immobilization particles. The prepared bacteria immobilization particles are high in biological activity, high in bacteria content (5*10<9>-1*10<10> CFU/g), short in starting time, and high in reaction speed, has a honeycomb structure (100-300 m<2>/g in specific surface area) suitable for bacteria apposition growth and mass transfer, and can be used for immobilizing bacteria for long, prohibiting the invasion of external hazardous materials, and permanently and efficiently treating sewage in different environments and of different water quality types; meanwhile, industrialized production is available for a whole bacteria immobilization particle preparation process, and the prepared bacteria immobilization particles are high in mechanical property, long in service life, and convenient to store and convey.
Owner:CENT LAB FUJIAN ACADEMY OF AGRI SCI +1

A kind of composite functional fluoride removal resin and its preparation method

InactiveCN102268114AEfficient and deep defluorinationImprove adsorption capacityOther chemical processesWater/sewage treatment by sorptionChemistryDichloroethane
The invention discloses a composite functional fluorine-removing resin, which belongs to the field of resins. The resin is based on styrene-divinylbenzene resin, the structural unit is , contains functional groups -NH2 and -SO3-X (Fe/Al), the particle size is 0.3-0.5mm, and the saturated adsorption capacity for F- is 2.16~8.10mg/g. The preparation method is: take styrene-divinylbenzene resin as the matrix, add 60-80% concentrated nitric acid and 75-98% concentrated sulfuric acid to react at 40-80°C, and stir for 0.5-3 hours to obtain the loaded nitro Resin R-NO2; use dichloroethane as swelling agent, add 80-98% concentrated sulfuric acid to react at 70-120°C, stir and react for 8-16 hours to get nitro-sulfonic acid resin R-NO2 -SO3H; at 60-100°C, add SnCl2·2H2O, concentrated hydrochloric acid, ethanol, and reflux for 8-16 hours to obtain amino-sulfonic acid resin R-NH2-SO3H; at 20-60°C, add 0.1-1.0 mol/L iron salt or aluminum salt solution, stirred and reacted for 18-30 hours, and the composite functional fluorine removal resin R-NH2-SO3-X (Fe/Al) modified by amino groups and supported by metals was prepared. The composite functional fluorine removal resin prepared by the invention can be used for high-efficiency and deep fluorine removal.
Owner:NANJING UNIV

Modified graphene for efficiently adsorbing methyl orange dye and preparation method of modified graphene

The invention relates to modified graphene for efficiently adsorbing methyl orange dye. According to the modified graphene, water-soluble chitosan quaternary ammonium salt is grafted to the surface of graphene oxide by using the electrostatic function of a non-covalent bond, the graphene oxide is reduced by using a chemical reduction method, and meanwhile the chitosan quaternary ammonium salt is retained on the surface of graphene; specifically, the modified graphene is prepared by firstly, ultrasonically dispersing graphene oxide into sodium hydroxide solution so as to obtain a graphene oxide dispersion liquid, subsequently adding into a chitosan quaternary ammonium salt solution, and mixing and stirring; adjusting the pH value of the mixed liquid by using the sodium hydroxide solution, adding a reducing agent hydrazine hydrate, and heating to obtain black flocculent precipitate, performing suction filtration, washing and drying. The modified graphene provided by the invention is good in dispersity in water, with the combination of the electrostatic function of the chitosan quaternary ammonium salt and the synergistic effect of the large specific surface area of graphene, methyl orange in a solution can be effectively removed, the adsorption property is high, the adsorption is stable, and the dye wastewater treatment efficiency is improved.
Owner:WUHAN UNIV OF TECH

Gasoline desulfurization adsorbent and preparation and application thereof

The invention relates to a gasoline desulfurization adsorbent and preparation and application thereof. A preparation method of the gasoline desulfurization adsorbent comprises the following steps of: mixing a zinc salt, a VIII family non-precious metal salt, other salts and a precipitant in a proton-containing polar solvent, and undergoing a precipitation reaction at the temperature ranging from the room temperature to 15 DEG C to obtain a sulfur storing agent; and soaking a soluble salt containing a VIB and/or VIII family transition metal into a molecular sieve carrier containing gamma-Al2O3to obtain an octane number restorative, wherein the gasoline desulfurization adsorbent comprises 5-50 percent by mass of molecular sieve, 5-80 percent by mass of zinc oxide, 1-30 percent by mass of VIB and/or VIII family non-precious metal and 5-50 percent of other bonding agents; the sulfur storing agent and the octane number restorative can be combined for using by mixing, soaking, performing deposition sedimentation and co-precipitating, and can be used separately; and the absorbent can be used for adsorbing almost all sulfides in gasoline to obtain ultra-low-sulfur even sulfur-free gasoline while the octane number is kept to be constant or be increased slightly.
Owner:PETROCHINA CO LTD +1

Bast fiber fabric with protective function and preparation method thereof

ActiveCN106012495AIncrease added valueImprove adsorption capacityBiochemical fibre treatmentLight resistant fibresChemistryChemical Linkage
The invention discloses a bast fiber fabric with a protective function and a preparation method thereof. The preparation method comprises the preparation steps of bast fiber pretreatment, oxidation treatment, chitosan acetic acid solution preparation, chitosan-modified oxidized bast fiber fabric preparation, chitosan-modified oxidized bast fiber fabric composite finishing through tea polyphenol and the like. According to the preparation method, bast fiber is selectively oxidized through periodic acid or periodate, a generated active group aldehyde group -CHO can generate an imidization reaction with chitosan containing -NH2, chemical bonding is generated between the aldehyde group and chitosan containing -NH2 under the condition that no cross-linking agent or other chemical additive is used, therefore, the tea polyphenol adsorption capacity of the fabric in the subsequent finishing process is enhanced, combination between tea polyphenol and the bast fiber is promoted, and the condition that other reagents are used in the tea polyphenol function finishing process is avoided. The bast fiber fabric has the good multifunctionality such as the antibacterial property, the wrinkle resistance and the ultraviolet resistance; the preparation technology of the bast fiber fabric is simple and convenient to operate, clean production is achieved in the preparation process, and the requirements of ecological textiles are met.
Owner:ANHUI AGRICULTURAL UNIVERSITY
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