425 results about "Alginic acid" patented technology

The invention relates to the technical field of land improvement, in particular to an alginic acid type multifunctional long-acting soil conditioner and a preparation method and application of the alginic acid type multifunctional long-acting soil conditioner. The core particle layer comprises an organic material, nano silicon, calcium magnesium polyphosphate, magnesium hydride, ammonium borate, rhamnose and an adhesive, and the slow release layer comprises clay minerals and alginate; the mass ratio of the clay mineral to the alginate to the organic material to the calcium magnesium polyphosphate to the nano silicon to the magnesium hydride to the ammonium borate to the rhamnose to the binder is controlled within a certain range. The soil conditioner provided by the invention is good in slow release performance, can release effective components durably and slowly, and has multiple effects of improving soil quality, providing nutrition, promoting crop growth, improving resistance and the like; the problems of soil acidification, heavy metal pollution, micro-plastic pollution, pesticide pollution, antibiotic pollution and the like in agricultural production can be effectively solved.

The invention discloses a microbial compound fertilizer for improving soil pollution, which is prepared by mixing a matrix fertilizer, alginic acid, cellulase, modified bentonite, biochar, a microbial agent, nano zero-valent iron and monopotassium phosphate according to a mass ratio of (30-40): (6-10): (5-8): (20-25): (15-20): (3-5): (4-6): (4-8), the microbial agent comprises pseudomonas, bacillus and silicate bacteria; heavy metal ions in soil can be effectively neutralized through the nanoscale zero-valent iron and the phosphate, pollutants in the soil can be effectively degraded through the microbial flora, meanwhile, nutrients needed by plant growth are provided, the modified bentonite is added, the soil structure can be changed, meanwhile, phosphorus and potassium fertilizers are provided for the soil, and the soil quality is improved. By adding alginic acid and cellulase, the activity of microorganisms is effectively enhanced, the fertility conversion efficiency of the microorganisms is improved, and soil improvement and remediation are achieved.

The invention relates to the technical field of soil conditioners, and particularly discloses an intelligent controlled-release core-shell alginate soil conditioner and a preparation method thereof.The conditioner is of a core-shell-layer three-layer structure and comprises a core layer, a middle shell layer and an outer layer, the three layers account for 30%, 40% and 30% of the total weight respectively, and the core layer mainly comprises improved alginate and nutrients; the middle shell layer mainly comprises chitosan and a microbial preparation; and the outer layer mainly comprises modified charcoal and magnetic nano # imgabs0 #. The preparation method comprises the four steps of core layer preparation, middle shell layer coating, outer layer coating and forming post-treatment, and multiple functions of accurate nutrient supply, efficient heavy metal fixation and soil microenvironment regulation and control are achieved through a core-shell-layer three-layer structure design and a pH / temperature / microorganism triple response mechanism by adopting a coaxial electronic injection and layer-by-layer self-assembly technology; the fertilizer has a remarkable improvement effect on sandy soil and saline-alkali soil, and the organic matter increasing rate reaches 40%.

The invention relates to the technical field of agricultural fertilizers, discloses a seaweed extract-functional microorganism compound slow-release fertilizer and a preparation method thereof, and solves the problems in the background art. The seaweed extract is a compound containing enteromorpha polysaccharide and alginic acid extract; the functional microorganism is a complex microbial inoculant composed of phosphate solubilizing bacteria, nitrogen-fixing bacteria, phosphate solubilizing bacteria and bacillus; the slow-release carrier is prepared by coating the seaweed extract and the functional microorganisms with sodium alginate-chitosan microcapsules; the signal molecule is selected from at least one of polyamine substances and jasmonic acid methyl ester; the fertilizer has the advantages that the utilization rate of the fertilizer can be increased, growth and reproduction of soil microorganisms are promoted, the stress resistance of crops is improved, and the requirements of different soil types and planting environments can be met.

The invention discloses a biochar-based slow-release fertilizer and a preparation method thereof, and relates to the technical field of fertilizer production, the biochar-based slow-release fertilizer comprises a core, a carrier layer, a biological layer and a protective layer, the core is composed of macroelements, microelements and a nitrification inhibitor; the carrier layer comprises graphene quantum dot modified charcoal, chitosan, glycerol and cyclodextrin grafted starch; the biological layer is prepared from magnetic Fe3O4 and humic acid nanoparticles, alginic acid oligosaccharide and diatomite; the protective layer comprises a polylactic acid-polycaprolactone block copolymer, acetone, calcium lignosulphonate, a dynamic covalent cross-linking agent gelatin, nano cellulose and an anti-blocking agent. Therefore, by adopting the polylactic acid-polycaprolactone (PLA-PCL)-based segmented copolymer and the dynamic covalent network cross-linking agent, the self-repairing property is endowed. The slow-release fertilizer provided by the invention realizes precise regulation and control of the fertilizer efficiency release rate through a multi-level synergistic effect, has the functions of soil remediation and stress resistance, and significantly improves the utilization efficiency of the fertilizer and the crop adaptability.

The invention discloses hyaluronic acid / alginic acid dual-network hydrogel as well as a preparation method and application thereof. The hyaluronic acid / alginic acid double-network hydrogel comprises a first network and a second network which are not crosslinked with each other, and the first network and the second network are distributed in the hydrogel in an interpenetrating manner; the first network comprises an ionic cross-linked network of alginic acid with cell adhesion sites and calcium ions, and the second network comprises a chemical cross-linked network formed by covalent cross-linking of methacrylic anhydride modified hyaluronic acid. The hyaluronic acid / alginic acid double-network hydrogel disclosed by the invention is short in curing time, supports three-dimensional spreading of cells and formation of capillary lumens, has good mechanical stability, and has good application prospects in the aspects of three-dimensional culture of the cells, tissue engineering construction and the like.

The invention discloses a metal ion-mediated composite polysaccharide-based steady-state probiotic loading body as well as a preparation method and application thereof, and belongs to the technical field of microorganisms. Sodium alginate and metal ions are coordinated and self-assembled through interaction of non-covalent supramolecules to form a metal ion-alginate skeleton network, functional guar gum is further filled, nano-scale aggregates are pushed to be spontaneously deposited on the surfaces of thalli, and a compound polysaccharide coating with excellent adhesion performance and steady-state performance is generated, so that the stability of the composite polysaccharide coating is improved. The independent coating of the probiotics is realized. The presence of metal ions increases the affinity of the biological material to the coated probiotics, and guar gum endows the probiotic delivery system with good adhesion characteristics. According to the probiotic loading body, the operation steps of an existing cell surface modification technology are simplified, the density is improved while the usage amount of biological materials is reduced, cells can be protected from being damaged by the gastrointestinal tract stress environment so as to maintain the activity of probiotics, and the colonization capacity and the biological activity of the probiotics in the intestinal tract are improved.

The invention relates to the technical field of saline-alkali soil improvement, and particularly discloses a preparation process and application of a multifunctional slow-release saline-alkali soil conditioner. The preparation process comprises the following steps: (1) uniformly mixing alginic acid powder, ardealite powder, carbon powder and water to form a wet material, then putting the wet material into a closed container, and carrying out heating and heat preservation treatment to obtain a precursor; and (2) standing the precursor at normal temperature, and then crushing the precursor to obtain the soil conditioner. The soil conditioner prepared by the process disclosed by the invention not only can more efficiently and quickly fix sodium, potassium, calcium and magnesium ions in soil, but also can reduce the content of carbonate ions, so that the salt content of the soil is reduced, and the alkalinity of the soil is reduced. In addition, the soil conditioner disclosed by the invention is also beneficial to relieving the alkali and salt returning phenomenon of the soil, and the use amount of the conditioner in the subsequent continuous soil improvement process is reduced.

The invention relates to a special fertilizer suitable for saline-alkali soil and a preparation method thereof. The fertilizer is granular and has a multi-layer structure which is sequentially arranged from inside to outside: a nutrition core layer, a controlled release film layer, a soil improvement fast exchange layer and a microorganism attaching layer. The nutrition core layer contains nitrogen, phosphorus, potassium and medium trace elements, and meets the basic nutrient requirements of crops; the controlled release film layer is self-assembled layer by layer by adopting alginate / chitosan, a humic acid-ferrous complex and a breakable cross-linking point are inserted into the film, and starch is sprayed on the outer layer, so that an ionic strength / alkalinity dual-response controlled release system is formed; the soil improvement quick exchange layer contains microcrystalline gypsum and ferrous sulfate; the microbial epiphytic layer fixes salt-tolerant phosphate solubilizing bacteria, potassium bacteria and exopolysaccharide-producing bacillus by using a charcoal-zeolite carrier, and the bacteria are distributed on the surfaces of the particles in a dotted manner. The fertilizer realizes organic combination of soil improvement, fertilizer supply and microbial regulation and control, can significantly reduce the soil salinity and alkalinity in a saline-alkali soil environment, and improves the fertilizer utilization rate and the crop growth performance.

The invention relates to the technical field of soil remediation, in particular to a biochar-humic acid-calcium alginic acid composite saline-alkali soil modifier and a preparation and application method thereof. The modifier adopts a multi-layer structure design: biochar is pre-adsorbed by calcium chloride, compounded with sodium humate, and then crosslinked with sodium alginate to form a gel to form a composite inner core; secondly, sulfobetaine methacrylate and vinyl phosphonic acid are introduced into a sodium alginate molecular chain through graft polymerization, and modified sodium alginate is obtained to serve as an outer layer coating material; and finally, dipping the composite inner core into the outer layer solution, and carrying out graded recalcification by calcium chloride and short-time treatment by sodium sulfate to obtain a final product. Through the synergistic effect of calcium ion slow release of the inner core and zwitterionic characteristics of the outer layer, efficient replacement and long-term stable regulation and control of soil sodium ions are achieved, the pH value, the conductivity and the alkalization degree of soil are remarkably reduced, the water holding capacity is effectively improved, and the soil conditioner is suitable for sustainable improvement of moderate and severe saline-alkali soil.

The invention belongs to the technical field of biological medicines and medical cosmetic materials, and discloses an alginic acid-based facial filler which comprises the following components in percentage by mass: 13-26% of an alginic acid-based material, 40-43% of polylactic acid microspheres and 34-44% of a freeze-drying protective agent, the alginic acid-based material comprises sodium alginate and oxidized sodium alginate, the G / M ratio of the sodium alginate to the oxidized sodium alginate is 3: 1-1: 1, and the mass ratio of the oxidized sodium alginate to the sodium alginate is 2: 1-1: 2. According to the preparation method, an alginic acid-based material with biodegradable stimulation characteristics is used, aldehyde groups of oxidized sodium alginate can generate Schiff base reaction with amino groups on the tissue surface so as to contribute to anchoring a target part, and the alginic acid-based material and polylactic acid microspheres can act on cells to promote collagen secretion; the face filler also has timely filling performance and gradient degradation performance. The invention also provides a preparation method of the alginic acid-based facial filler.

The invention discloses a multi-element soil fertility improvement biological modifier and a preparation method thereof, and belongs to the technical field of soil fertility improvement. The modifier is prepared from modified straw aerogel, a strontium titanate loaded lignin compound, lanthanide modified potassium feldspar powder, alginic acid oligosaccharide composite gamma-aminobutyric acid, carbon nitride quantum dots, bacterial cellulose nanofibers and polyaniline nanotubes according to the mass ratio of (18-22): (15-17): (13-15): (7-10): (10-13): (3-5): (7-10): (10-13): (5-8). The composite microbial inoculant is composed of a nano zero-valent iron-montmorillonite compound and a nitrogen fixation-phosphate solubilizing composite microbial inoculant. The modified straw aerogel and the bacterial cellulose nanofibers are interwoven to form a three-dimensional network framework, a habitat is provided for soil microorganisms, the water and fertilizer retention capacity of soil is enhanced, and meanwhile, the network structure promotes transmission of nutrients and water in the soil and improves the nutrient utilization efficiency.

The invention relates to the technical field of water-soluble fertilizers, in particular to a water-soluble organic fertilizer and a preparation method and application thereof.The water-soluble organic fertilizer is prepared from, by mass, 40-100 parts of basic organic raw materials, 5-15 parts of microbial fermentation additives, 10-20 parts of nutrient element supplements and 3-7 parts of synergists; the microbial fermentation additive comprises a compound microbial agent and a microbial growth carrier, the nutrient element supplement comprises a nitrogenous fertilizer, a phosphatic fertilizer, a potash fertilizer and medium trace elements, and the synergist comprises fulvic acid and alginic acid. According to the water-soluble organic fertilizer and the preparation method and application thereof, efficient utilization and accurate supply of nutrients are achieved, the growth requirements of crops in plant factories are met, meanwhile, resource utilization of organic waste is promoted, and sustainable development of the plant factories is promoted.

The invention discloses an efficient treatment process for salt-containing industrial wastewater, and relates to the technical field of wastewater treatment. Salt-containing industrial wastewater sequentially passes through an adjusting tank, a silicon and hardness removal unit, a biochemical unit, a secondary sedimentation tank, a fluorine removal unit, a filter unit, a catalytic ozonation unit, a moving bed bio-membrane reactor treatment unit, a powder carbon sedimentation unit and an ultrafiltration-reverse osmosis double-membrane unit to be treated, produced water is recycled, and concentrated water enters an evaporation and concentration unit; the silicon removal and hardness removal unit is used for treating the wastewater by adding a flocculating agent and a composite coagulant aid; the flocculating agent is a chitosan-based flocculating agent, and the addition amount of the flocculating agent is 10 to 20 mg / L; the composite coagulant aid is composed of a magnesium-aluminum hydrotalcite coagulant aid and alginic acid-silicate hybrid microgel according to the mass ratio of 2: (1-4), and the addition amount of the composite coagulant aid is 5-15 mg / L. The treatment effect of the salt-containing industrial wastewater is remarkably improved.

The invention discloses an application of a red alginic acid receptor Grik2b in prevention and treatment of bactrocera dorsalis. According to the invention, the expression level of Grik2b is reduced through an RNAi technology, and the regulation and control effect of the red alginic acid receptor on the oviposition behavior of the female bactrocera dorsalis is proved; according to the invention, an inhibitor capable of being combined with Grik2b is also screened, and female insects treated by the inhibitor show serious oviposition defects. Therefore, by taking the Grik2b receptor as the target spot, the oviposition behavior of the female insects can be effectively inhibited, the population quantity is further controlled, meanwhile, the risk that the insects generate drug resistance is extremely low, and efficient and safe prevention and control of the fruit flies in the tropical and subtropical regions are facilitated.

The invention provides an edible fungus culture medium and a preparation method, and relates to the technical field of edible fungus cultivation, and the edible fungus culture medium comprises the following components by mass: 10-20 parts of a seaweed polysaccharide matrix, 5-15 parts of insect protein powder, 15-25 parts of biological carbon fiber, 10-20 parts of corncob powder, 0.5-2 parts of a natural silicon source, a proper amount of a trace element solution, and a proper amount of water. The algal polysaccharide matrix is obtained by extracting algal polysaccharides, including algin or alginic acid, from algae in hot water, the insect protein powder is prepared by drying, crushing and carrying out enzymolysis on yellow mealworms or fly maggots, the biochar fibers are prepared by pyrolyzing bamboo or crop straws, and the natural silicon source is diatomite, bentonite or perlite; the particle size of the natural silicon source is micron-sized, and the trace element solution contains zinc, iron, copper and manganese elements. The culture medium has the beneficial effects that the problems of unbalanced nutrition, poor physical performance, weak disease resistance and the like of the culture medium in the prior art are effectively solved.

The invention relates to the technical field of crop cultivation, and particularly discloses a method for increasing the anthocyanin content of triticale grains, which comprises the following steps: respectively spraying 80-100 times of leaf fertilizer diluent once at the elongation stage and filling stage of triticale growth, and spraying 6-10kg / mu each time; the formula of the foliar fertilizer is as follows: 100 mg to 150 mg of mannose, 100 mg to 150 mg of fructose, 130 mg to 160 mg of mannitol, 160 mg to 200 mg of betaine, 180 mg to 200 mg of alginic acid, 180 mg to 200 mg of fucoidin, 300 mg to 350 mg of amino acid and 1000 g of water. According to the method, the content of anthocyanin in triticale grains can be remarkably increased by spraying 80-100 times of foliar fertilizer diluent prepared by the method in the elongation stage and the pustulation stage of the triticale.

The invention belongs to the field of medical modification and natural polymer hydrogel, and provides viscosity-adjustable viscoelastic hydrogel and application of the viscosity-adjustable viscoelastic hydrogel in evaluation of influence of hydrogel viscosity on cell behaviors. Through a double crosslinking mechanism of covalent crosslinking and ionic crosslinking, two viscoelastic hydrogels with the same initial modulus and different viscosities are prepared. The covalent cross-linked hydrogel is composed of methylacryloylated alginic acid (AlgMA), gelatin (Gel) and phenyl (2, 4, 6-trimethylbenzoyl) lithium phosphate (LAP), and the ionic cross-linked hydrogel is composed of sodium alginate (Alg), gelatin (Gel) and calcium chloride. By accurately controlling the crosslinking degree, fine adjustment of the viscosity of the hydrogel is realized without changing the initial modulus of the hydrogel, which has important influence on adhesion and survival of neural stem cells. The experimental method provided by the invention verifies the key effect of the viscosity of the viscoelastic matrix in cell behavior regulation.

The invention relates to the technical field of water-soluble fertilizers, in particular to an amino-alginic acid organic water-soluble fertilizer and a preparation method thereof.The preparation method comprises the following steps that S1, one or more of macroelements, medium elements, microelements, amino acid and humic acid are dissolved to obtain a solution A; s2, adding nano silicon dioxide into the solution A, and uniformly dispersing to obtain a solution B; s3, adding sodium alginate into the solution B to obtain a colloidal solution C; s4, adding a stabilizer and a synergist into the colloidal solution C to obtain a colloidal solution D; s5, performing spray drying on the colloidal solution D to obtain solid powder E; s6, dissolving the degradable polymer, and adding a cross-linking agent to obtain a solution F; and S7, uniformly spraying the solution F onto the solid powder E, and performing spray drying to obtain the water-soluble fertilizer. According to the water-soluble fertilizer disclosed by the invention, the manner of coating the nanoparticles with the nanocapsules is adopted, so that the water-soluble fertilizer is efficiently utilized, and the yield and the quality of crops are improved.

The invention belongs to the technical field of saline-alkali soil improvement, particularly relates to a saline-alkali soil improver and a use method thereof, and provides the following scheme aiming at the problems that an existing saline-alkali soil improver cannot remarkably improve the soil structure of saline-alkali soil with the high salinization degree, consequently, the soil water stability is low, and plants are difficult to grow normally. The flue gas desulfurization gypsum comprises the following raw materials in parts by weight: 800-1200 parts of flue gas desulfurization gypsum, 10-60 parts of aluminum sulfate and 20-70 parts of an organic material, through use of the desulfurized gypsum, aluminum sulfate, an organic material, sodium lignin sulfonate, ammonium sulfate, carbamide, acrylic acid, chitosan, a dispersant, a biological agent, a wormcast fermentation broth, wood vinegar, calcium silicate, alginic acid, polysaccharide, hydrogel, plant peptide and polyurethane, the saline-alkali soil structure with a high salinization degree is significantly improved; the soil water stability is effectively improved, and the normal growth of plants is ensured.

An enhanced hydrogel composition, and a preparation method therefor and the use thereof. According to the composition, a hydrogel is formed by means of a physical cross-linking mechanism using the chelation between calcium ions and an alginic acid raw material, with the assistance of a carboxymethyl cellulose raw material to reduce the sensitivity of the chelation. The hydrogel retains a high water absorption rate of media; meanwhile, the elastic modulus of the hydrogel is significantly enhanced by means of the introduction of silicon dioxide. The method for preparing the composition comprises: dispersing the carboxymethyl cellulose raw material, the alginic acid raw material, and the silicon dioxide in a solution, mixing same uniformly, drying the mixture to obtain a material A, and then mixing the material A with a calcium source to obtain the composition. Further provided is the use of the composition in the preparation of a space-occupying product in the digestive tract.

The invention discloses a planting method of selenium-rich cherries. The planting method comprises the following steps that selenium-containing fertilizer is applied to soil in a flushing mode when tree bodies germinate at the end stage of a dormancy period; in the flowering stage, nitrogen-phosphorus-potassium balanced fertilizer is applied, and the synergist composition and the selenium-enriched nutritional agent are sprayed on leaf surfaces at intervals; and spraying the synergist composition and the selenium-rich nutritional agent on leaf surfaces at intervals for multiple times in a fruit swelling period. The synergist composition disclosed by the invention is prepared from the following components: polyoxyethylene fatty alcohol ether, polyether modified organic silicon, natural plant saponin, chitosan oligosaccharide, alginic acid, hydrolyzed collagen and the like. The selenium content of the cherry fruits cultivated by the method can reach 0.078-0.082 mg / kg, after the cherry fruits are stored for 15 days, the hardness of the fruits is maintained at 65-68.5 N / cm < 2 >, the weight loss rate is controlled at 4.0-4.5%, the rotting rate is controlled at 3.2-3.8%, the retention rate of vitamin C reaches 83-86%, and the storage period is prolonged by 3-4 days compared with that of conventional cultivation. The method is easy to operate, low in cost and high in applicability, and the quality and storage performance of the cherry fruits can be remarkably improved.

The invention relates to the technical field of ecological restoration, in particular to a method for improving the transplanting survival rate of saplings in a hydro-fluctuation belt of a hydropower station reservoir area in a dry-hot valley area, which comprises the following steps: mixing a composite slow-release fungicide composition, saplings and seedling raising soil, putting the mixture into planting pits, and maintaining; the composition comprises the following raw materials: arbuscular mycorrhizal fungus powder, plant growth-promoting rhizobacteria, an alginate aqueous solution, a salicylate aqueous solution and a calcium chloride solution. The preparation method of the composition comprises the following steps: mixing the arbuscular mycorrhizal fungi, the plant growth-promoting rhizobacteria and the salicylate aqueous solution to obtain a mixture; dropwise adding the mixture into an alginate aqueous solution to form a mixed solution; and mixing the mixed solution with a calcium chloride aqueous solution, and curing to obtain the composite slow-release fungicide composition. The composite slow-release fungicide composition is mixed with saplings, so that the survival rate of the saplings is increased, and the ecological restoration rate of a hydropower station reservoir area in a dry and hot valley area is increased.

The invention relates to a multi-mode deformation sensing hydrogel as well as a preparation method and application thereof. The sensing hydrogel comprises the following components: alginic acid hydrogel and methacrylic acid hyaluronic acid, and clamping two long ends of the alginic acid hydrogel, drying, dissolving methacrylic acid hyaluronic acid in water, and polymerizing and molding with the alginic acid hydrogel to obtain the multi-mode deformation sensing hydrogel. Compared with the prior art, the three-dimensional strain sensor has excellent comprehensive mechanical properties and conductivity, and has a three-dimensional strain detection range, good signal repeatability and high response sensitivity.

The invention relates to the field of agriculture, and in particular to a chitosan functionalized nano-selenium fertilizer and an application thereof. The components of the nano-selenium fertilizer composition and their weight percentages are: 0.5-4.0% chitosan functionalized nano-selenium; 0.8-3.2% ectoine; 0-3.0% alginate; 0.5-5.0% surfactant; and the balance of deionized water. The invention has been found through experiments that in the composition of the invention, ectoine can significantly promote the absorption of chitosan functionalized nano-selenium by plants and promote the enrichment of selenium in plants, and the use of alginate can further increase the promoting effect of ectoine on the absorption and enrichment of nano-selenium by plants, thereby producing a synergistic effect.

The invention discloses a hydrogel microsphere with a core-shell structure, the hydrogel microsphere comprises a sodium hyaluronate hydrogel core and a sodium alginate shell, and the sodium hyaluronate hydrogel core also comprises a slow release factor and divalent metal ions. The hydrogel microspheres with the sodium hyaluronate hydrogel as the inner core and the alginic acid as the shell can realize accurate targeted blasting in the intestinal tract, and can be adhered to the local part of the intestinal wall to induce benign intestinal flora to treat the inflammatory bowel disease, so that the phenomenon that when the medicine arrives at the intestinal tract, the medicine cannot be damaged is avoided; due to peristalsis of the intestinal tract, the medicine can not be accurately released to a specific position. The mass ratio of sodium hyaluronate to sodium alginate is controlled to be (4-20): 1, and the explosion speed of the microspheres is controlled, so that the release speed and the position accuracy of the medicine are controlled, the problem that the blood concentration of the medicine cannot be effectively controlled due to the fact that the release speed of the medicine is too high or too low is solved, the curative effect of the medicine is improved, and side effects are reduced.

The invention discloses a preparation method of stability-enhanced alginic acid-keratin-based double-coated nanoparticles. The preparation method comprises the following steps: carrying out controllable enzymolysis, enzyme deactivation, centrifugation and freeze-drying on keratin to obtain keratin nanoparticles formed by self-assembly; dispersing the keratin nanoparticles in an acidic buffer solution to carry out structure development, adding bioactive molecules, and adjusting the pH to be neutral to recombine and close the keratin nanoparticle structure to obtain a keratin nanoparticle solution loaded with the bioactive molecules; the preparation method comprises the following steps: taking keratin as a template, dispersing the keratin into a sodium alginate solution, dropwise adding into a calcium chloride solution, cross-linking to form a calcium alginate shell, dialyzing or centrifuging to remove free bioactive molecules, and freeze-drying to obtain the bioactive molecule loaded alginic acid-keratin-based double-coated nanoparticles. The invention also discloses double-coated nanoparticles and application thereof, through controllable enzymolysis and pH regulation and control, the self-assembly and bioactive molecule encapsulation of the keratin nanoparticles are improved, and the double-coated nanoparticles with regular shape, good dispersibility, good redissolvability and good environmental stability are formed.

The invention discloses an alginate-based high-entropy metal oxide as well as a preparation method and application thereof, and belongs to the technical field of gas sensor materials. The preparation method comprises the following steps: mixing a high-entropy metal salt solution of at least five metal sources with an alginate solution to prepare alginate-based high-entropy metal aerogel, and then wrapping the alginate-based high-entropy metal aerogel with carbon cloth and rapidly heating the alginate-based high-entropy metal aerogel by using a Joule thermal method to obtain the nanosheet-shaped alginate-based high-entropy metal oxide. The material can be used for high-sensitivity detection of ethanol gas. The preparation method provided by the invention is green, simple and rapid, has a good sensing response effect in ethanol gas detection, and the sensing material has good stability, can be recycled for multiple times, and has a good application prospect.

The invention provides a novel mineral separation activating agent for sulphide ores and a preparation method of the novel mineral separation activating agent. The cleaning agent comprises 1-2 parts of basic cupric carbonate, 2-4 parts of ammonium chloride, 2-4 parts of nanometer jade powder, 2-3 parts of alginic acid, 1-2 parts of allyl glycidyl ether, 2-3 parts of peregal O, 2-3 parts of sodium di-sec-octyl maleate sulfonate, 2-3 parts of vinyl acetate, 4-7 parts of hydrogen peroxide, 4-6 parts of disodium hydrogen phosphate and 40-50 parts of water. The preparation method comprises the following steps: firstly mixing basic cupric carbonate and ammonium chloride to obtain a first mixture, then mixing the rest components, heating and stirring to obtain a second mixture, and finally uniformly mixing the first mixture and the second mixture. The activating agent overcomes the defects of a traditional activating agent, has efficient activating performance, can improve the beneficiation efficiency of low-grade, complex and refractory sulfide ore, is environmentally friendly, good in stability and high in adaptability, and provides technical support for efficient development of sulfide ore resources.

The invention relates to the technical field of fertilizers, in particular to an alginic acid organic water-soluble fertilizer capable of quickly releasing nutrients and a preparation method of the alginic acid organic water-soluble fertilizer. The organic water-soluble fertilizer is prepared from the following preparation raw materials: 30 to 35 parts of sodium alginate, 12 to 15 parts of a seaweed extract composition, 5 to 8 parts of monocalcium phosphate, 5 to 8 parts of monopotassium phosphate, 12 to 15 parts of urea, 0.5 to 0.8 part of a chelating agent, 40 to 45 parts of an organic fertilizer raw material, 1.5 to 2 parts of a microbial strain, 12 to 16 parts of ammonium humate, 4 to 6 parts of a cosolvent and 1.4 to 1.7 parts of xanthan gum. By optimizing the ratio of the raw materials, the absorption and utilization rate of plants to the water-soluble fertilizer is remarkably improved; nutritional ingredients can be quickly released, and plants can be promoted to absorb water-soluble fertilizer; through the synergistic effect of microorganisms and organic components, the content of nutrient substances in soil is increased, plants are helped to better absorb mineral substances and trace elements, the utilization efficiency of the fertilizer is improved, healthy growth of the plants is promoted, and the yield is increased.