117results about How to "Preparation method green" patented technology

The invention discloses a gold nanocluster-gold nanoparticle-titanium dioxide compound photocatalyst and application thereof. The gold nanocluster-gold nanoparticle-titanium dioxide compound photocatalyst having different particle sizes is firstly obtained by preparing a gold nanocluster solution based on chloroauric acid and a reducing type glutathione as raw materials and carrying out an impregnation method and illumination condition control on gold nanocluster solution and titanium dioxide nanoparticles. The gold nanocluster-gold nanoparticle-titanium dioxide compound photocatalyst is simple in preparation method without high temperature and high pressure conditions; compared with the existing gold nanocluster-titanium dioxide and gold nanoparticle-titanium dioxide catalysts, the gold nanocluster-gold nanoparticle-titanium dioxide compound photocatalyst disclosed by the invention is higher in photocatalytic efficiency and hydrogen production efficiency, can be used for hydrogen production by photolysis of water, and is beneficial to sustainable development of environments and energy sources.

The invention discloses a porous carbon, and a preparation method and applications thereof. The preparation method of the porous carbon comprises the following steps: (1) under the non-oxidizing condition, calcining at least one of alginic acid, sodium alginate, kalium alginate, lithium alginate, magnesium alginate and calcium alginate to obtain the porous carbon precursor; (2) treating the porous carbon precursor, which is obtained in step (1), with water or acid solution to obtain wet porous carbon; and (3) drying the wet porous carbon obtained in step (2) to obtain porous carbon. When the porous carbon is used as an electrode material for electrochemical capacitors, due to abundant multilevel pore structures and oxygen functional groups, the porous carbon can fully utilize the surface area in the structures and provide additional pseudo capacitance, so that the porous carbon has the advantages of higher capacity, energy density, power density and electrochemical stability. The preparation method is green and environment-friendly, and is very suitable for large-scale production.

The invention discloses a preparation method of polysaccharide-based nanometer particles sensitive to tumor microenvironments. The preparation method comprises the steps: preparing an initiator solution by adding an initiator to a water-soluble polysaccharide solution and adjusting pH, then adding a monomer-containing solvent (or directly adding monomers) and a cross-linking agent sensitive to reducing environments for carrying out polymerization and cross-linking reaction so as to obtain nanometer particles, and finally carrying out dialysis or centrifugal treatment and freeze drying to obtain the polysaccharide-based nanometer particles sensitive to tumor microenvironments. The preparation method is green, pollution-free, high in yield, efficient and convenient in synthesis and low in cost; the prepared polysaccharide-based nanometer particles are high in solid content and uniform in particle sizes; due to introduction of the cross-linking agent sensitive to reducing environments, the nanometer particles sensitive to tumor microenvironments can be prepared and have a wide application prospect in aspects of design and application of carriers for tumor treatment.

The invention provides hot-work die steel with good cutting performance and a preparation method of the hot-work die steel. The die steel comprises the following components of, in percentage by weight, 0.28%-0.31% of C, 0.56%-0.70% of Si, 1.10%-1.20% of Mn, smaller than or equal to 0.020% of P, 0.01%-0.05% of S, 0.40%-0.80% of V, 7.00%-8.00% of Cr, 0.20%-1.00% of Ni, smaller than or equal to 0.01%of Alt, 0.10%-0.30% of Cu, and 0.01%-0.02% of Ca, and meanwhile, the content of gas in steel is required to meet the conditions that [O] is smaller than or equal to 20 ppm, [H] is smaller than or equal to 3 ppm, [N] is 80 ppm to 120 ppm, and the balance is Fe and inevitable impurities. The preparation method comprises smelting, large slab continuous casting, heating, rolling, pre-treatment, normalizing and tempering; and the hot-work die steel has the advantages of high machinability and high corrosion resistance, and is suitable for continuous casting large slab production.

The invention relates to a preparation method of a sericin-polyvinyl alcohol blended antibacterial film loaded with nano-silver, and a product and application of the antibacterial film. The preparation method is characterized in that silkworm cocoons are treated at high temperature and high pressure to obtain a sericin solution; then, the sericin solution and a prepared polyvinyl alcohol solution are blended, and are poured into a container; through freezing-unfreezing circulation, sericin-polyvinyl alcohol blended gel is obtained; drying is performed; a sericin-polyvinyl alcohol blended film is obtained; finally, the prepared film is added into an AgNO3 solution; the sericin-polyvinyl alcohol blended antibacterial film loaded with the nano-silver is obtained by an ultraviolet radiation reduction method. The prepared sericin-polyvinyl alcohol blended antibacterial film loaded with the nano-silver has good mechanical performance, water absorption performance and antibacterial performance, and is hopeful to be applied to the field of biomedical materials.

The invention relates to a triazinyl covalent network loaded metal single atom composite material, a preparation method and application thereof. The composite material comprises a triazinyl covalent network and transition metal single atoms loaded on the triazinyl covalent network, the triazinyl covalent network is composed of a structural unit shown in a formula (I), and the structural unit is formed by crosslinking a pyridine unit and a triazinyl ring. The composite material has a multilayer hierarchical porous structure, endows the material with extremely high specific surface area and rich catalytic active sites, and has excellent catalytic activity, excellent stability and methanol resistance in electrocatalytic oxygen reduction reaction. The method overcomes the defect that in the prior art, a monatomic catalyst is prone to agglomeration and causes unstable catalysis, single atoms can be evenly loaded in a triazinyl covalent network structure, the utilization rate of the single atoms is increased, side reactions in the electrocatalytic reaction are inhibited, and the selectivity of the electrocatalytic reaction is improved.

The invention discloses a method for preparing a high-crystallinity covalent organic framework membrane by using an ionic liquid-water interface. The method comprises the following steps of: dissolving an aldehyde monomer in a hydrophobic ionic liquid to obtain a solution A; dissolving an amine monomer and an acid catalyst p-toluenesulfonic acid in deionized water to obtain a solution B; transferring the solution A into a reactor, adding deionized water to the surface of the solution A, layering, adding the solution B to the upper part of the deionized water layer, and performing a reaction for more than 3 days in the reactor under the condition of still standing at room temperature, so as tosynthesize the covalent organic framework membrane by using a double-diffusion control mechanism that the hydrogen-bond interaction of the acid catalyst and the amine monomer and the high viscosity of hydrophobic ionic liquid are utilized and the diffusion rates of the two monomers are limited at the same time. The covalent organic framework membrane prepared by the method has very high crystallinity, the specific surface area of themembrane is increased by 4 times compared with that of a covalent organic framework membrane synthesized on a traditional dichloromethane-water interface, and the solvent flux is also increased by 2 times under the condition that dye interception is not influenced.

The invention discloses a multifunctional natural super-hydrophobic material and application thereof. The material is a super-hydrophobic coating formed by modifying a safe and nontoxic hydrophobic substance on a phase transformation coating obtained by reducing protein with a reducing agent. The preparation method of the super-hydrophobic coating is simple, and the material can be adhered to thesurface of any base material and has good mechanical stability and hydrophobic stability. The super-hydrophobic coating can be used for modifying a cellulose membrane to obtain a recyclable super-hydrophobic packaging material with anti-mold performance, so that the adhesion of liquid food is resisted; medical materials (blood transfusion tubes, blood transfusion bags and the like) are modified, and the super-hydrophobic medical material capable of resisting biological fluid adhesion is obtained; ceramic surfaces of toilets, urinals and the like are subjected to super-hydrophobic modificationto resist adhesion of urine; super-hydrophobic modification is performed on living goods (clothes and aprons); and the material is used as a waterproof coating for large-area application scenarios (walls, ships, concrete reservoirs, wooden floors, interiors of refrigerators, interiors of range hoods, air conditioner water storage boxes and internal pipelines).

The invention provides a preparation method of a rare earth cerium-quantum dot coordination polymer double-emission fluorescent probe. The method comprises the following steps that (1) triphosadenineis added into a tromethamine hydrochloride buffer solution; after the uniform mixing, carboxyl quantum dots and a Ce(NO3)3 solution are added; slow stirring and uniform mixing are performed at room temperature; a white turbid solution is formed; (2) the white turbid solution obtained in the first step is centrifugalized at a certain rotating speed for certain time; white precipitates are obtained;ultrapure water is used for cleaning for three times; the white precipitates are resuspended in 1mL of ultrapure water; the rare earth cerium-quantum dot coordination polymer double-emission fluorescent probe is prepared. The prepared double-emission fluorescent probe can be used for sensitive detection of hydrogen peroxide and glucose.

The invention discloses a surface-enhanced Raman flexible substrate and a method for quantitatively detecting a pesticide parathion-methyl. A filter paper sheet is soaked in a gold nanoparticle sol for a certain time, Au NP is adsorbed to the surface of the filter paper sheet to form the surface-enhanced Raman flexible substrate, and a strong Raman signal is generated, and residual pesticide molecules are detected; the reproducibility, stability and sensitivity of the substrate are evaluated by using a probe molecule 4-mercaptobenzoic acid, and a linear relationship between the concentrationof 4-MBA and Raman characteristic peak intensity is established; a parathion-methyl standard solution is detected by using the paper surface enhanced Raman flexible substrate, and a corresponding standard curve is established; and the substrate is applied to detection of pesticide residues on the surface of an actual sample through a pasting-uncovering method, and a result shows that the recoveryrate is high. According to the invention, the surface-enhanced Raman flexible substrate is constructed by combining a nano material with paper, and is used for rapidly detecting pesticide residues onthe surface of the actual sample, so that complex sample pretreatment is omitted, and the method has the characteristics of simplicity and high efficiency.

The invention discloses an electrochemical method for self-doping modification of a titanium dioxide photo-catalyst. The electrochemical method comprises the following steps: firstly, anodizing a Ti sheet for in-situ growth of titanium dioxide nano-tubes (TiO2 NTs), then performing cathode reduction on the titanium dioxide nano-tubes to obtain Ti<3+> self-doped TiO2NTs and finally putting a samplein a tubular furnace in which nitrogen gas is introduced for high-temperature calcination to obtain self-modified TiO2NTs (Reduced TiO2 NTs) containing stable Ti<3+>. The electrochemical method disclosed by the invention has the benefits that firstly, due to the contained stable Ti<3+>, the material photo-catalytic activity is high, and the performance is stable; secondly, tubular structures of the prepared TiO2 NTs enable the directional transmission of photo-generated electrons, and due to larger specific surface area, light and contact contaminants are more easily captured; finally, a material preparation method is green and simple, and the prepared all-solid-state catalyst is convenient to use and recover and can also be used as an electrode to participate in the application to the electrochemical field. The catalyst with high performance loss can also be prepared again by ultrasonic cleaning, so that the catalyst regeneration is realized, and the cost is reduced.

The invention discloses a method for determining ultratrace oleylamine grafted polysuccinimide based on a carbon dot marked fluorometric immunosorbent method. The method comprises the following steps:preparing PSIOAm coating antigen and immunogen, injecting the immunogen into an animal body to obtain a high-specificity antibody, then preparing C-dots marked PSIOAm antibody into a fluorescent antibody, and then establishing carbon dot fluorometric immunosorbent to accurately determine the content of PSIOAm. By combining the specificity of the antigen and antibody reaction and the carbon dot with high fluorescent quantum yield, the PSIOAm nano particles are quantitatively detected and analyzed. A linear range of the detection method is 5*10<-4> to 5*10<2>ng/mL, and the detection limit can reach 0.15 pg/mL.

The invention discloses a treatment process for degrading printing and dyeing wastewater through photocatalysis. An adopted photocatalyst is a bismuth nanocluster-bismuth nanoparticle/TiO2/graphene composite photocatalyst. According to the catalyst, oxidized graphene is firstly prepared, then TiO2 with photocatalytic activity is loaded on a slice layer of the oxidized graphene, a bismuth nanocluster is modified onto a graphene slice layer of TiO2, and photo-reduction is carried out. The composite photocatalyst has high catalytic degradation activity aiming at the printing and dyeing wastewater. The treatment process provided by the invention solves the problem of low degrading efficiency of the printing and dyeing wastewater in the prior art, and is applicable to degrading organic dyes inthe printing and dyeing wastewater.

The invention discloses a bamboo cellulose aerogel thermal insulation material and a preparation method and application thereof. The preparation method comprises the steps that bamboo processing wasteis subjected to bleaching treatment to remove lignin to prepare holocellulose, the holocellulose is prepared into suspension liquid and then subjected to ultrasonic crushing, and then pre-freezing and vacuum freeze-drying treatment are conducted in sequence. The preparation method comprises a chemical treatment step, an ultrasonic treatment step and a freezing treatment step, so that the use of chemical agents can be greatly reduced, and the preparation method is green and environmentally friendly; the preparation method is simple in preparation process, low in energy consumption, short in preparation time, wide in raw material source, low in price, low in cost and wide in practical application prospect; the prepared bamboo cellulose aerogel thermal insulation material not only has certain strength, but also has a good thermal insulation effect, can effectively improve the utilization rate and the industrial added value of the bamboo processing waste, expands the recycling way of thebamboo processing waste, and is of great theoretical significance.

The invention discloses a deacidfieation method of high-acid-value vegetable oil. The deacidified vegetable oil is obtained by mixing and dissolving the high-acid-value vegetable oil and monoethanolamine in an organic solvent, adding a catalyst, reacting for 1-24 hours at the temperature of 50-100 DEG C, and removing the catalyst, the unreacted monoethanolamine and fatty acid glycollic amide in the vegetable oil after the reaction. The invention provides a deacidfieation process of the high-acid-value vegetable oil, calcium oxide which is extensive in sources, low in price and easy to obtain is taken as the catalyst, and monoethanolamine is taken as an acyl acceptor for an amidation reaction with free fatty acid in the high-acid-value vegetable oil, so that the problems of high consumptionof neutral oil, high energy consumption, a large number of byproducts, strict process, high cost and the like in the previous deacidfieation process are avoided, and the deacidfieation method is suitable for the high-acid-value vegetable oil. The deacidfieation method meets the new national standard for the vegetable oil that an acid value is not higher than 3 mg KOH per g, and is simple in process, low in cost, green, efficient, and huge in application potential.