90results about How to "Increase electropositivity" patented technology

The invention discloses a lime-fly ash joint treatment method for high-concentration fluorine-containing wastewater, which comprises the following steps: lime primary precipitation treatment stage: the temperature is 10°C, the amount of lime added is 0.1-0.2g per 50mL of fluorine-containing wastewater, Adsorption time is 30-60min, pH is 5.0-8.0; fly ash secondary adsorption treatment stage: temperature is 15°C-45°C, fly ash addition is 5.0-15.0g per 50mL fluorine-containing wastewater, adsorption time is 60- 120 minutes, pH is 5.0-7.0, and the fly ash has been modified by acid solution in advance. The modified fly ash is used for industrial wastewater treatment to improve the utilization rate and effect of the fly ash, and the fly ash is a renewable material, which can be recycled through pickling and other processes.

The invention discloses a method for preparing chitosan-like efficient flocculant, which comprises the following steps of: (1) pre-treatment of chitosan and derivatives of chitosan: dissolving chitosan and derivatives of chitosan in an acetic acid solution with pH value being 5, uniformly stirring, adding alkali until the pH value is 9 and chitosan separates out, and carrying out suction filtration for later use; (2) preparation of efficient flocculant: adding 1-2 parts of the pre-treated chitosan and derivatives of chitosan, 3-5 parts of cross-linking agents, 1 part of carbamide and 1.5-3 parts of aluminum sulfate in a four-port flask, stirring, pre-reacting for 0.5-1h in a water bath at 60-80 DEG C, then adding 3-8 parts of a dicyandiamide and carbamide mixed modifier, continuing to react for 2-4h, to obtain carbamide-chitosan-dicyandiamide like composite flocculant; and (3) purification of the product: after the reaction, separating out the product by using acetone; carrying out suction filtration; washing the product with ethanol; carrying out suction filtration, and drying in an oven at 90 DEG C for further use.

The invention discloses collagen-based composite hemostasis powder and a preparation method thereof. The method is characterized by comprising the following steps: modifying type I collagen by using dencichine, preparing the modified type I collagen into a solution with the concentration of 1-2 percent by using polylysine-modified chitosan; preparing medical gelatin into a 1-3% solution; preparing the modified chitosan into a 1-3% solution; blending the three solutions according to a mass ratio of 0.5-1:2-8:8-2; stirring at the temperature of 4-10 DEG C for 8-10 hours, and performing freeze drying to prepare composite sponge; sequentially impregnating the composite sponge in a modifier and a blood coagulation factor in an ultrasonic cleaner, fully washing, performing freeze drying, and grinding by a grinder to prepare the collagen-based composite hemostasis powder. The powder has the effects of rapidly and effectively stopping bleeding, resisting bacteria, diminishing inflammation, relieving pain, promoting wound healing and repairing, has high adhesion property, hydrophilicity, biological degradability and biocompatibility and is low in price and suitable for wound hemostasis or repair.

The invention discloses a preparing method for anti-microbial hemostatic chitosan. The preparing method for the anti-microbial hemostatic chitosan comprises the steps that a cationic reagent solution is dropwise added in an epoxy reagent solution, the reaction temperature is controlled at 25-90 DEG C, reaction is conducted for 2-24h, pressure-reduction and distillation are conducted after the reaction is finished, and a quaternary ammonium reagent is obtained; the quaternary ammonium reagent is dissolved in a solvent, and a quaternary ammonium reagent solution is prepared; chitosan is added in an alkaline solution, then the quaternary ammonium reagent solution prepared in the step S1 is added and stirred for reaction, and the anti-microbial chitosan is obtained after washing and drying of raw products. The invention further discloses the application of the anti-microbialhemostatic chitosan. A chitosan anti-microbial hemostatic sponge is prepared, according to the standard of GB/T20944.3-2008, the detected bacteriostasis rate of staphylococcus aureus is greater than or equal to 98%, the bacteriostasis rate of escherichia coli is greater than or equal to 90%, and it is indicated that the prepared chitosan anti-microbial hemostatic sponge has the anti-microbial effect; the hemostatic effect of the prepared anti-microbial hemostatichemostatic sponge is excellent, and hemostatic time is less than or equal to 60 seconds; and the anti-microbial hemostatic sponge prepared by utilizing the chitosan has no obvious cytotoxicity, and biodegradation can be achieved.

The invention discloses an algae harvesting method taking modified chitosan as a flocculant. The method comprises the following steps: firstly, modifying chitosan to obtain a guanidine chitosan flocculant, and then adding the guanidine chitosan flocculant to a micro algae culture solution, so that the concentration of the guanidine chitosan flocculant in the micro algae culture solution is 2-100mg/L, stirring for 5-10 minutes, standing and participating for 10-120 minutes; removing supernate, and harvesting the micro algae. The chitosan has a better flocculation effect after being modified in a guanidination manner, and can be applied to collection of micro algae after large-scale cultivation, and rapid treatment of a harmful algal body of leading to water eutrophication, and the algae harvesting method has the advantages of low cost, less investment, simple preparation technological condition, environment friendliness and the like.

The invention discloses a novel metal oxide iron-copper composite modified quartz sand filter material, and a preparation method and application thereof. Concretely, the metal oxide iron-copper composite modified quartz sand filter material is prepared by modifying quartz sand with ferric trichloride and copper sulfate as modifying agents by adopting a microwave technology at the same time. The metal oxide iron-copper composite modified quartz sand filter material prepared by using the method in the invention can effectively adsorb organic and inorganic pollutants, heavy metals, phosphorus, etc. in water; the material has a specific surface area which is 8.96 times of the specific surface area of ordinary quartz sand, and has larger adsorption capacity than the ordinary quartz sand; a removal rate of the material to humic acid is 96.58% and is increased by 67.86% than the removal rate of the ordinary quartz sand to the humic acid; and the removal rate of the material to the phosphorus in water is 71.5% to 96.23%. Moreover, the modified quartz sand filter material has higher adhesion strength to pollutants and is reduced in desorption rate to surface metals; meanwhile, the material has low production cost and investment cost and is convenient for industrial production.

The invention provides a friction nano generator based on biomembrane materials and suitable for being used in a high humidity environment and a preparation method and application thereof, and belongsto the technical field of friction nano generators. The friction nano generator uses high polymer of which surface is modified by oxygen group, fluorine group or nitrogen group as a friction layer. Under high humidity, the group on the surface of the friction layer can form hydrogen bonds with water molecules in the environment, so that the density of electron clouds around the group is equalized, and the energy of the friction layer is reduced, the water molecules are caused to participate in friction electrification. Since the water molecules are prone to losing the positive charge of electrons in the friction electrification process, and the friction layer is further a material which loses the positive charge of the electrons in the friction process, the water molecules and the friction layer have a superposition effect, so that the positive electricity of the friction layer-water molecules is enhanced, the output is increased, anti-humidity effect is achieved, higher electric output can be kept in a high-humidity environment, and the friction nano generator based on the biomembrane materials is applied to the fields of environmental dissipation energy collection, humidity early warning or humidity sensing. The preparation method is simple and easy to operate.

The invention discloses a bio-based high-breathability antibacterial fabric and a preparation method thereof. The antibacterial fabric comprises a base cloth and an outer-layer cloth, and the base cloth and the outer-layer cloth are bonded through a modified hot melt adhesive; the modified hot melt adhesive comprises a hot melt adhesive, modified silicon dioxide, an additive A and an additive B; the modified silicon dioxide is mainly prepared from hexadecyltrimethylammonium bromide, tetraethoxysilane, mercaptopropyltrimethoxysilane, methylbenzene and hydrogen peroxide; the additive A is mainlyprepared from silver nitrate, glucose and sodium chloride; and the additive B is mainly prepared from chitosan, 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, N-hydroxysuccinimide and lysine. According to the bio-based high-breathability antibacterial fabric and the preparation method thereof, the process design is reasonable, the component proportion is proper, and the prepared antibacterial fabric has excellent antibacterial performance and breathability and has high practicability.

The invention discloses a synthetic method of a collagen hyperbranched polyester/metallic ion loaded fluoride adsorbent. The synthetic method is characterized in that terminal hydroxyl hyperbranched polyester is grafted to collagen under the effect of a cross-linking agent to increase the content of surface active group in collagen; the prepared hyperbranched polyester loaded collagen is complexed with metallic ion; and then the complexed and hyperbranched polyester/metallic ion loaded collagen can be utilized for treating fluoride-containing wastewater. The synthetic method is simple, and industrial production is easy to realize; the prepared product shows high selectivity for the fluoride in an aqueous solution and can perform complete adsorption; the collagen of the waste leather in tanning process can be used for treating the fluoride-containing wastewater after being modified, so that the purposes of treating sewage with waste and maximizing the economic benefit can be reached.

The invention discloses a hydrophobic modified organic/inorganic composite flocculant and a preparation method and application thereof. The structural formula of the hydrophobic modified organic/inorganic composite flocculant is as follows: R1 is Al or Fe or Ti, R2 is-NH (CH2) 2CH3 or-NHCH (CH3) 2, n ranges from 4.012 to 19.47, and the value range of x: y is (3.1 to 12.4): 1. The flocculant has both inorganic groups and organic groups, improves the defect of insufficient charge density of a single flocculating agent, and improves the electric neutralization characteristic so that the flocculation speed of the composite flocculating agent is increased, the effective flocculation range is widened, and the floc settling performance is good; the nanocrystallization flocculant has the advantages of multiple surface atoms, large particle specific surface area, high specific surface energy and the like, and the flocculation performance of the flocculant on pollutants is further improved; in addition, the flocculating agent subjected to moderate hydrophobic modification has excellent flocculation performance on micromolecular organic pollutants containing hydrophobic functional groups in awater body, and is wide in application range.

The invention discloses a polyethyleneimine modified porous silicon dioxide-coating LDH core-shell nano composite material and a preparation method thereof, and relates to a core-shell structure nanocomposite material and a preparation method thereof. The problems that plasmid DNA combined by an existing LDH-coated SiO2 shell-core nano composite material is easily degraded by nuclease, and the biological stability is poor are solved. The method comprises the following steps: 1, preparing aminated porous silicon dioxide; 2, preparing carboxylated porous silicon dioxide; 3, preparing polyethyleneimine modified porous silicon dioxide; and 4, preparing the polyethyleneimine modified porous silicon dioxide-coating LDH core-shell nano composite material. According to the core-shell nano composite material prepared by the method, plasmid DNA cannot be recognized by protease and nuclease and cannot be degraded, and the core-shell nano composite material has very high biological stability. Theinvention is applied to the field of gene delivery vector materials.

The invention relates to a compound flocculant with polymerization ferric chloride and amination polymers based on papermaking sludge and a method for preparing the compound flocculant. The method includes synthesizing amination polymers from the papermaking sludge generated in the papermaking industry; compounding the amination polymers and the inorganic flocculant polymerization ferric chloride to prepare the compound flocculant with the polymerization ferric chloride and the amination polymers based on the papermaking sludge. The compound flocculant and the method have the advantages that the color removal rate of disperse yellow water samples can reach 95% at least when the compound flocculant is used for treating the simulated dye water samples and the dosing quantity of the compound flocculant is 5 mg/L, excellent flocculation effects can be realized by the compound flocculant for water samples under different acidity and alkalinity conditions and other diversified water samples, the capital construction cost of reaction tanks and sedimentation tanks can be reduced, and the compound flocculant is high in electricity performance and flocculation efficiency, good in dissolving property, long in storage cycle and applicable to the field of water supply, wastewater treatment and the like and suitable for actual application to water treatment.

The invention provides an oxime ester photoinitiator, a preparation method, a light-sensitive resin composition and application. The oxime ester photoinitiator contains polymerizable groups and is ofa structure shown in the general formula (I). Since the oxime ester photoinitiator contains the polymerizable groups, in the application process, the oxime ester photoinitiator can form a high molecule condensate with large molecular weight through a polymerization reaction, and the photo-initiation mobility can be effectively lowered. The oxime ester photoinitiator further contains electron-withdrawing groups, so that the electropositivity of the polymerizable groups is improved, which helps to further improve the initiation efficiency of the photoinitiator. In conclusion, the oxime ester photoinitiator of the structure has the advantages that the oxime ester photoinitiator is not easily migrated and is high in photo-initiation efficiency.

The invention provides a preparation method of a catalytic cracking flue gas desulfurization agent. The preparation method provided by the invention comprises the following steps: dipping cerium ion active components on a granular carrier under a certain condition, adding alumina sol and/or silica sol, drying, and roasting to obtain a semi-finished product, wherein the active components can be better dispersed on the carrier; simultaneously, more acid centres can be formed in the carrier; and the reaction activity is increased; and then, dipping magnesium ion active components on the semi-finished product, drying, and roasting to obtain the desulfurization agent. According to the invention, the cerium ion active components are dipped at first; the magnesium ion active components are dipped after alumina sol and/or silica sol are/is added; therefore, the cerium active components are sufficiently dispersed in an aluminium oxide porous channel; the magnesium active components form a clad layer outside the cerium active components; in the event of desulfurizing, desulfurization reaction is carried out in different levels; the desulfurization activity is higher; the transfer rate of SOx in flue gas is high; and the desulfurization agent is long in service life.

The invention provides a preparation method of a polybutadiene, which comprises the following steps: under the actions of a cocatalyst and a cobalt complex disclosed as Formula (I), carrying out polymerization reaction on butadiene in an organic solvent to obtain polybutadiene. In the polybutadiene preparation process, the cobalt complex disclosed as Formula (I) and the cocatalyst are used as the catalyst, the electrophilic chlorine atoms introduced into the ligand structure of the cobalt complex increase the electropositivity of the active center cobalt atom, thereby endowing the butadiene monomer with larger coordination space; and thus, the cobalt complex has higher catalytic activity, so the polybutadiene has higher yield. The experiment proves that the yield of polybutadiene is 72-97% in the butadiene catalytic polymerization process of the cobalt complex.

The invention discloses a fast preparation method of a high-transmittance silica aerogel film, and belongs to the technical field of function materials. After tetraethoxysilane and ethylene glycol monomethyl ether, ethanol or methanol are uniformly mixed, deionized water and a dryness control chemical additive are added, the mixture is stirred uniformly, ammonium fluoride is added, and silica sol is obtained; a cleaned and dried glass substrate is immersed in the silica sol, constant-speed pulling and film coating are performed, and a wet gel film is obtained; the wet gel film is subjected to ambient pressure drying in the atmosphere of ethylene glycol monomethyl ether, and the silica aerogel film is obtained. The preparation period is greatly shortened, nucleophilic attack can be performed to form an intermediate state of a high coordination state, fluorine has lower electronegativity compared with oxygen, central silicon ions have higher electropositivity, a silicon oxygen bond is weakened, a gel polymerization reaction is facilitated, and the high-transmittance silica aerogel film with excellent mechanical property is formed.

The invention provides a post-transition metal complex having a structure shown in a formula (I). The invention also provides a preparation method of the post-transition metal complex, which comprises the following steps: performing first reaction on di(substituted phenylamine)-2,6-pyridine dicarboxamide and phosphorous pentachloride in a first organic solvent to obtain a ligand having a structure shown in a formula (II); and performing second reaction on the ligand and post-transition metal halide in a second organic solvent to obtain the post-transition metal complex having the structure shown in the formula (I). The invention also provides a polyethylene preparation method which comprises the following specific step: under the effects of a cocatalyst and the post-transition metal complex having the structure shown in the formula (I), performing polymerization reaction on ethylene in an organic solvent to obtain polyethylene. The post-transition metal complex provided by the invention has high catalytic activity in catalytic ethylene polymerization.

A method for preparing para toluene sulfonamide by directly amidating para-toluenesulfonic acid comprises the following steps: (1) anhydrous para-toluenesulfonic acid is dissolved in dichloromethane, a catalyst, namely organic boronic acid, and a 5A molecular sieve are added in a mixed solution, and the mixed solution is uniformly stirred for a certain time under the condition that the temperature is controlled to be -10 to 0 DEG C; (2) an ammonia gas is introduced at the -10 to 0 DEG C for reaction; (3) after the reaction is finished, suction filtration is conducted on the reaction liquid to remove the molecular sieve, and then washing is respectively performed once with an acid solution, an alkali solution and a salt solution; (4) an organic phase is dried through anhydrous sodium sulfate, then a drying agent is removed, a dichloromethane solvent is subjected to distillation recovery, and crude para toluene sulfonamide is obtained; (5) weighing is performed after washing with distilled water and drying, and the product purity is analyzed through liquid chromatography. The complexation is generated between organic boric acid energy and oxygen on a sulfonic acid molecule, the reaction activity of the para-toluenesulfonic acid is improved, ammonia molecules are easily combined with sulfur to generate amide, the whole reaction energy consumption is low, no waste acid is discharged, and the yield of para toluene sulfonamide is about 40%.

The invention belongs to the field of medical materials for bone damage repair and specifically relates to rubidium-containing bone cement and a preparation method and application thereof. The rubidium-containing bone cement disclosed by the invention is prepared from a rubidium salt solution and calcium aluminate, wherein a concentration of rubidium salt in the rubidium salt solution is 0.01 to 1 mol/L. The rubidium-containing bone cement disclosed by the invention has the advantages of short setting time, low setting temperature, good plasticity and biological compatibility and suitability for plastic repair in the fields of orthopedics, cerebral surgery, dentistry, cranium and the like.

The invention provides a semiconductor device, and particularly relates to an aluminum silicate glass-passivated semiconductor device. For example, a lead or zinc oxide and aluminum oxide aluminum silicate glass layer is suitable for high-voltage application. In order to increase the reliability of the semiconductor device under reverse bias and high stress, an aluminum silicate glass-passivated layer often contains caesium of which the concentration is 20ppm (mol, mole percent) to 200ppm (mol, mole percent).

The invention relates to a phosphorus-free environmentally-friendly type imidazoline corrosion and scale inhibitor and a preparation method thereof. The phosphorus-free environmentally-friendly type imidazoline corrosion and scale inhibitor is prepared from, by weight, 30-40% of water-soluble imidazoline, 4-6% of nonionic terpolymer, 15-20% of sodium gluconate, 1-3% of dissolvable zinc salt, 0.5-1.5% of sodium tetraborate, 0.5-1.5% of sodium bromide and the rest distilled water. According to the phosphorus-free environmentally-friendly type imidazoline corrosion and scale inhibitor, the annualcorrosion rate is lower than 0.0500 mm/a, the scale inhibition rate reaches 98% or above, and the good scale and corrosion inhibition effects are achieved.

The invention provides a red-light carbon dot, and belongs to the technical field of biological materials. The preparation method comprises the following steps: adding metal phthalocyanine into organic solvents, carrying out ultrasonic treatment, adding hydrogen peroxide, stirring the mixture at normal temperature, adding cationic polymers or cationic lipids to carry out a hydrothermal reaction, naturally cooling reaction products to room temperature after the reaction, and dilutting the cooled reaction products, centrifuging, filtering, dialyzing and drying to obtain water-soluble red-light carbon dots or fat-soluble red-light carbon dots. Two kinds of carbon dots, the water-soluble or fat-soluble carbon dots, can be obtained by adding different raw materials. The water-soluble carbon dots can be directly mixed with a gene drug to form a red-light carbon dot nucleic acid compound, and an amphiphilic red-light carbon dot nano-compound is obtained by adding amphiphilic macromolecules with good biocompatibility into the fat-soluble red-light carbon dots. The red-light carbon dot nucleic acid compound and the amphiphilic red-light carbon dot nano-compound can be applied to medical imaging and tumor treatment products, and the amphiphilic red-light carbon dot nano-compound is a multifunctional diagnosis and treatment integrated material with great clinical transformation potential.