40results about How to "Change surface charge" patented technology

A preparation method of a high-capacity monocrystalline type ternary cathode material comprises steps as follows: S1, a nickel cobalt manganese hydroxide precursor of a core-shell structure is prepared with a coprecipitation method, a loose and porous core is prepared by intermittently introducing a certain quantity of bicarbonate at the initial stage of core making, after core making ends, and loose flaky shells are prepared by substantially reducing the rotation speed and increasing pH; meanwhile, at the core-shell transition stage, a dispersant is added to effectively prevent agglomerationof the shells due to decrease of the rotation speed; S2, the prepared precursor and lithium salt are mixed and calcined once in the oxygen-rich atmosphere at the high temperature, and the monocrystalline type ternary cathode material is obtained. A battery is prepared from the ternary cathode material and has high capacity and good safety performance due to high lithium ion transport efficiency and reduced anisotropy in crystals. The problem of poor capacity of the material because of low lithium ion transport efficiency of monocrystalline type ternary materials is effectively solved. Besides,the monocrystalline type ternary cathode material is prepared through one-time sintering, the preparation procedure is simple, and the production cost is low.

The invention discloses a method for sustainably preparing nanometer cellulose in an environment-friendly and economic mode. The preparing method includes the following steps that 1, cellulose raw materials and organic acid are hydrolyzed and esterified; 2, the treated cellulose is prewashed in a centrifugal sedimentation mode, the organic acid is separated to be continuously recycled, washed cellulose suspension liquid is dialyzed, and then reacted acid and accessory substances are removed; 3, the dialyzed suspension liquid is separated to obtain small-particle cellulose nanometer crystals; 4, cellulose solid precipitated on a lower layer of the suspension liquid is treated through a high-pressure homogenizer or an ultrasonication physical machine to obtain colloidal cellulose nanometer fibrils. According to the method, in the preparing process, the modified cellulose raw materials are synchronously hydrolyzed and esterified through relative-safety and environment-friendly food-grade organic acid; compared with inorganic strong acid, the used organic acid is low in corrosion performance, high in boiling point, small in reaction pressure and easy to control and operate, and the cellulose nanometer crystals with the stable quality and the cellulose nanometer fibril products with the stable quality can be obtained at the same time.

The invention provides a compound type sludge dewatering conditioner which comprises the following components in parts by weight: 3-6 parts of ferric trichloride, 3-6 parts of calcium oxide, 1-2 parts of magnesium oxide, 1-4 parts of surfactant and 1-2 parts of sulfuric acid. The compound type sludge dewatering conditioner provided by the invention can realize efficient dewatering of sludge, the conditioning technology is simple and quick, the dosage of the conditioner is small, the moisture content of the dewatered sludge is reduced to below 45%, the pH value is 6-7, foul smell and the problem of capacity increase are avoided, and sludge reduction can be realized; and the compound type sludge dewatering conditioner has good environmental benefits, is favorable for subsequent sludge resource utilization, can be widely applied to the sewage and sludge treatment of the industries such as chemical industry, municipal affairs and the like, and is particularly suitable for treating the domestic sludge of urban sewage plant.

The invention relates to a polymer lipid nanoparticle, a preparation method and application thereof as a vaccine adjuvant system. The polymer nanoparticle is a solid sphere composed of a macromoleclar polymer, positively charged cationic lipid is inlaid on the surface, the nanoparticle surface can adsorb protein antigen, polypeptide antigen, viral antigen and other active drugs; the polymer nanoparticle has an average particle size of less than 300nm, a dispersion coefficient, i.e. a PDI (polydispersity) value of less than 0.2, and a Zeta potential average value of greater than 20mV. The polymer nanoparticle provided by the invention has the characteristics of uniform size, high antigen carrying rate, and good maintenance of antigen activity, when the polymer nanoparticle carries an antigen and serves as a vaccine adjuvant, the intake of antigen presenting cells (APCs) to the antigen can be increased, the activation level of antigen presenting cells is improved, and the follow-up immune response level is strengthened.

The invention discloses a technique for treating fermentation wastewater by a microbial fuel cell, and relates to a technique for treating wastewater. The method comprises the steps as follows: with conductive glass, carbon cloth or a carbon felt as electrode materials, active groups, polyelectrolyte multilayer films or nanoparticles/polyelectrolyte multilayer films are respectively modified on the electrode materials by an alkaline hydrolysis method, an acid hydrolysis method and a layer-by-layer self-assembly technique; the series materials are applied to an anode of a microbial fuel cell reaction device to treat the fermentation wastewater; with sodium acetate and lotus pond sludge as substrates, a microbial fuel cell system with a relatively high electricity generating rate, relatively good chemical oxygen demand (COD) removal effects and relatively high coulombic efficiency is obtained. The microbial fuel cell system is good in process repeatability, safe and reliable; the fermentation wastewater is treated; meanwhile, a relatively high electricity generating quantity and a relatively high electricity generating rate are achieved; the problems that the traditional microbial fuel cell is low in electricity generating efficiency and low in sewage COD removal rate are effectively solved; and the technique has a good industrial application prospect.

A method for preparing a C/SiC material brake disc by a carbon fiber prepreg tape comprises the following steps: clipping the carbon fiber prepreg tape into a short carbon fiber tape with the length of 3-10 mm and pressing the short carbon fiber tape into a brake disc blank; carbonizing the blank to obtain a carbon/carbon preform; and finally carrying out carburizing treatment to obtain a product.Carburizing treatment comprises the steps of placing the carbon/carbon preform in a graphite crucible; heating the carbon/carbon preform for 0.5-2 hours at the temperature of 1,550-1,650 DEG C undervacuum or in an inert atmosphere; and then cooling the carbon/carbon preform in a furnace to finish carburizing treatment. A C/SiC composite material has the advantages of low cost, short process period, pollution-free preparation process, simplicity and controllability and the like on preparation of the carbon/carbon preform, and is expected to be extensively applied to a C/SiC composite brake disc.

The invention discloses a method for preparing a nano FeOx/NiOy/mesoporous material catalyst. The method comprises the following steps: mixing and soaking an aqueous solution of Ni<2+> and Fe<3+> with a mesoporous material, drying, roasting and reducing to prepare a mixed-phase multi-metal oxide catalyst. The invention further discloses a catalyst prepared by the method and an application of the catalyst. According to the method disclosed by the invention, the mesoporous material is utilized to perform spatial definition on the growth of nano particles to obtain the nano particles with uniform particle diameters. Iron and nickel are co-loaded to further improve the shapes, the particle diameters and the dispersion of the nano particles, so that the activity of the catalyst is greatly improved, and the Fenton degradation rate and the hydrogen peroxide utilization rate of the organic substances are greatly increased. The catalyst application method is simple, the types and the proportions of the active ingredients can be precisely controlled through the reducing temperature, and multiple components co-exist in a polyvalent manner. The preparation method disclosed by the invention is simple; and the oxidant is green and environment-friendly, high in utilization rate, can directly react at a room temperature and has an industrial application prospect.

The invention belongs to the field of medicine chemicals and in particular relates to application of resveratrol in preparing an anti-SARS-CoV-2 (severe acute respiratory syndrome-coronavirus-2) medicine. According to the application, in-vitro cell level experiments show that a prepared novel high-solubility quick-release RES (resveratrol) preparation has a certain inhibition function on SARS-CoV-2, the inhibition function is prior to that of RES which is independently used, and possibility of clinical use can be achieved. In the preparation, super-saturation formation modes are concluded intothree principles in mutual combination and mutual synergism, that is, the RES is formed at an amorphous molecular state by using a water-soluble high polymer material, a part of the RES at the molecular state is wrapped by using cyclodextrin and is distributed to the surface of the water-soluble high polymer material, and charges on the surface of a medicine-high polymer material complex are improved by using surfactants such as phospholipid and sodium cholate.

The invention discloses a synthetic method of a ZSM-5/mordenite composite molecular sieve, comprising the following steps of: firstly carrying out alkali treatment on mordenite under an enclosed condition so as to prepare a structure-directing agent; mixing inorganic base, an aluminium source, a silicon source and water with stirring according to a certain mole ratio, adding the structure-directing agent, ZSM-5 zeolite and chloride, and crystallizing at the temperature of 160-180 DEG C for 15-45 hours so as to obtain the product. According to the method, the structure-directing agent is used to greatly raise directing efficiency of mordenite, greatly reduce the amount of mordenite and simultaneously increase crystallization degree of mordenite in the composite molecular sieve. During the synthetic process, addition of the chloride is beneficial to synthesis of the core-shell structured molecular sieve with high degree of complexation. The method provided by the invention is simple and easy to operate. Raw materials are cheap, easily available and nontoxic and harmless such that the use of expensive and toxic organic template raw materials is avoided. Therefore, production cost is reduced, and the whole preparation process is green and environmental friendly.

The invention provides an environment-friendly chromium-free leather retanning method. The dyeing uniformity and strength of the leather are further improved, and the durability of the leather is improved. The retanning fullness and the filling property of the leather are improved, so that the leather with obviously higher cutting yield is obtained; a traditional retanning agent is designed into astrip-shaped microcapsule form, good filling performance is realized, the flatness of the leather is improved; in addition, the grain defects of the leather are well repaired, and the retanning agentcan be released for a long time under stress or heating through the design of the microcapsules, so that the obtained leather product is more durable; through cooperation of carboxymethyl cellulose,non-chromium metal and acrylic polymers, dyeing is brighter and more uniform, the tinting strength of the surface of the leather is improved, the color fading phenomenon is basically avoided, and theleather can be endowed with better properties such as bacterium resistance and mildew resistance according to needs. The leather process disclosed by the invention is green and environment-friendly, not only does not discharge chromium, but also reduces the use of dyes, and the microcapsule-shaped retanning agent is beneficial to recycling and has good social and economic benefits and applicationvalues.

The invention discloses a preparation method of high-viscosity attapulgite-based inorganic gel, which comprises the steps of crushing natural attapulgite raw ore, rolling, dispersing into an acidic aqueous solution, activating, and sequentially carrying out rotational flow grading treatment and ultrasonic rod crystal beam dissociation treatment to obtain a suspension after rod crystal beam dissociation; adding inorganic salt into the suspension, and stirring to react to obtain a modified suspension; and obtaining the modified suspension through solid-liquid separation, finally, rolling a filter cake into slices, and drying the slices to obtain an inorganic gel product. According to the method, the attapulgite suspension subjected to acid activation, purification and rod crystal beam dissociation is subjected to inorganic salt modification and the like, so that the modification effect and the viscosity of the gel product are effectively improved, and the attapulgite-based mineral inorganic gel product with excellent suspension stability, viscosity and adaptability is obtained, and can be used as a tackifier and a suspension stabilizer to be applied to the fields of high-end coatings, biomedicine or daily chemicals and the like.

The invention discloses a washing-resistant rubber lining for a cyclone and a preparation method thereof. The rubber lining is prepared by taking the nitrile rubber and butadiene rubber as matrix, taking polyurethane cellosilk, carbon fiber and polyamide fiber as the skeleton fiber, taking the sepiolite powder, carbon black and nano-aluminum oxide powder as filler, taking a aluminic ester couplingagent, liquid coumarone resin and modifying additive as the additive, and mixing the raw materials with anti-wearing auxiliary, a sulfurizing agent BPO and DM, wherein the anti-wearing auxiliary is prepared by mixing nitrile rubber powder, dioctyl phthalate, aluminium oxide, succinic acid and KH580; the modifying additive is prepared by mixing KH570, nanometer aluminum hydroxide, acetone and barium hydroxide. By arranging the rubber lining on the inner wall of the cyclone, thus the ore pulp directly impacts on the rubber lining, and the aim of protecting the inner wall of the cyclone is achieved; the rubber lining is easy to change after being damaged, and the service life of the cyclone is greatly prolonged.

The invention provides a sewage treatment agent as well as a preparation method and application thereof, and relates to the technical field of sewage treatment, and the sewage treatment agent comprises a component A and a component B. The component A is prepared from the following raw materials in parts by weight: 20-40 parts of biologically modified zeolite powder and 10-23 parts of non-ionic polyacrylamide; the component B is prepared from the following raw materials in parts by weight: 8-18 parts of carbon-doped modified titanium dioxide, 5-10 parts of polyaluminum chloride, 3-8 parts of amino trimethylene phosphonic acid and 8-15 parts of silicate,. The sewage treatment agent has an excellent removal effect on dyes, organic pollutants, ammonia nitrogen, suspended solids, total phosphorus, heavy metals and the like in sewage, the treated wastewater can reach the first-grade discharge standard, and the preparation method is simple and convenient to popularize and apply.

The invention provides a simple preparation method of a continuous compact mordenite membrane, and mainly aims to solve the problem that a uniform, complete and high-flux membrane cannot be obtained due to poor binding force between a carrier and a seed crystal layer and thick seed crystal layer. The preparation method comprises the following steps: firstly, carrying out hydrolytic copolymerization on tetraethoxysilane and zirconium n-butoxide to prepare nano-scale SiO2-ZrO2 sol containing polyhydroxy; dispersing a micron-sized mordenite (MOR) molecular sieve into the silicon-zirconium sol to form a seed crystal solution; and finally, coating an alumina carrier tube with a seed crystal by adopting a dip-coating method, drying and roasting to obtain a complete and continuous seed crystal tube, and growing to form a film by adopting a secondary hydrothermal method. According to the invention, the problems of defects caused by poor binding force between the carrier and the seed crystal layer and membrane flux reduction caused by over-thick seed crystal layer are effectively solved.

The invention relates to the technical field of titanium dioxide, in particular to slurry titanium dioxide and a preparation method thereof. The slurry titanium dioxide comprises titanium dioxide, sodium hexametaphosphate and a dispersing agent which are sequentially coated with a first film layer and a second film layer from inside to outside; the first film layer comprises a zirconium coating layer or a silicon coating layer; the zirconium coating layer mainly comprises nano zirconium oxide and zirconium oxide; the silicon coating layer is mainly composed of nano silicon oxide and silicon oxide; the second film layer is mainly composed of nanometer aluminum oxide and aluminum oxide. The surface of titanium dioxide is coated with a specific coating layer, and particularly nano oxide is added into the coating layer, so that the number of micropores and the hydroxyl content of the surface of titanium dioxide can be increased, surface charges of titanium dioxide can be changed, and repulsive force among titanium dioxide particles and the binding degree between the particles and a dispersing agent can be enhanced; the heat treatment can reduce the isoelectric point of the inorganic coated titanium dioxide slurry and improve the dispersion stability and storage stability of the slurry titanium dioxide. And the slurry titanium dioxide can save the cost of secondary dispersion.