139results about How to "Short degradation time" patented technology

The invention relates to a decomposition maturing agent for degrading straw. The agent comprises active ingredients, such as candida tropicalis, aspergillus oryzae, trichoderma viride and bacillus subtilis. The decomposition maturing agent can rapidly decompose wheat straw, rice straw, grain straw, sweet potato stems, broad bean stems, rape stalks, weeds, leaves and household garbage of which the fibrous matter content is high so as to prepare an organic fertilizer. The decomposition maturing agent has the advantages of short degradation time and capability of effectively killing diseases and pests and providing nutrients for crops.

A preparation method of water soluble chitosan group stanch wound sponge, which is characterized in dissolving water soluble chitosan derivatives in water, preparing 1%-10% weight percentage concentration of uniform colloid solution; subpackaging the colloid solution in mould, freezing in vacuum freeze drier at -20--60 DEG C, vacuum freeze drying 24-60 hours. The water soluble chitosan group stanch wound sponge of the invention is used for stanching and boosting wound healing of clinical operation, has advantages of convenient using, great mount of absorption solution, firm adhesion, better exerting function locally; selected material absorb water gradually to form gel in physiology pH condition during preparation, products have good local pasting property, exert stanching and boosting wound healing function so much the better; and products without immunogenicity in body, short degradation time, good compatibility with living body, better safety performance of clinic.

The invention discloses a three-dimensional porous titanium substrate lead dioxide electrode which comprises a porous titanium substrate, wherein interlayers are arranged on two side surfaces of the porous titanium substrate in a thermal deposition manner; the interlayers consists of a tin-antimony oxide; a lead dioxide surface active layer is arranged on the interlayer on one side surface of the porous titanium substrate in an electric deposition layer. The invention further provides a preparation method of the three-dimensional porous titanium substrate lead dioxide electrode, and further provides application of the three-dimensional porous titanium substrate lead dioxide electrode in musk ketone in degraded wastewater. In the musk ketone in the degraded wastewater, the three-dimensional porous titanium substrate lead dioxide electrode is taken as an anode, copper foil as a cathode and a sodium sulfate solution as an electrolyte, electrocatalytic oxidation is implemented for 1-2 hours, and then degradation treatment on the musk ketone in the wastewater can be completed. When the musk ketone is degraded by using the three-dimensional porous titanium substrate lead dioxide electrode under an electrifying condition, the degradation time is short, the degradation rate is high, and the operation is convenient.

The invention discloses a preparation method of a slag-based geopolymer-iron oxide semiconductor composite catalyst and an application in dye degradation. The preparation method relates to two-step reaction of synthesis of the geopolymer and loading of iron oxide semiconductor, and is characterized in that the industrial solid waste slag is taken as raw materials and is synthetized into slag-based geopolymer binding material under the excitation of sodium silicate, and the slag-based geopolymer binding material is soaked in ferric nitrate water solution and is roasted to form the slag-based geopolymer-iron oxide semiconductor composite catalyst. The semiconductor composite catalyst is used in degradation reaction of photocatalytic congo red dye and methylene blue dye, the highest degradation rate can reach up to 100%, the degradation efficiency is high, and secondary pollution is not caused; and the semiconductor composite catalyst has a simple preparation process, is low in cost, and can realize large-scale preparation.

The invention relates to a hydrogel material, and in particular relates to silk fibroin hydrogel; the silk fibroin hydrogel provided by the invention is the silk fibroin hydrogel prepared from a silkfibroin solution under the action of an inducer containing large molecular weight polyethylene glycol, wherein the large molecular weight polyethylene glycol refers to polyethylene glycol having a weight average molecular weight of 3,000 to 8,000; the silk fibroin hydrogel provided by the invention has good biocompatibility, can promote cell proliferation, is matched with natural tissue in mechanical strength, injectable, and easy to implant, and has no toxic and side effects.

The invention discloses preparation and application of a titanium dioxide composite photocatalytic system. A preparation method comprises the steps of (1) nanometer gold preparation; (2) nanometer gold-carbon quantum dot preparation; (3) nanometer gold-carbon quantum dot-titanium dioxide composite system preparation. Visible light is used for performing photocatalytic performance test on the prepared composite material; the excellent photocatalytic performance of the material is proved by degrading organic pollutants of nonyl phenol. By starting from the angle of the composite material, the nanometer gold-carbon quantum dots are used as a titanium dioxide sensitizer; in visible light, after the photolytic activity sensitizer absorbs energy, free electrons are excited out; the electrons aretransferred onto a conduction band of titanium dioxide and then take a reduction reaction with organic matters; a good degradation effect is achieved. Nontoxic and harmless carbon quantum dots are used for modifying the titanium dioxide; a titanium dioxide visible light photocatalytic system is built; the absorption capacity and the catalytic activity of the system are improved; the degradation efficiency on pollutants is enhanced.

The invention provides an environment-friendly polyethylene plastic. The polyethylene plastic is prepared from the following components in parts by weight: 80-100 parts of low-density polyethylene, 15-20 parts of starch, 8-10 parts of dicumyl peroxide, 7-10 parts of glycerol, 8-10 parts of maleic anhydride, 5-8 parts of calcium carbonate, 6-8 parts of glycerol, 2-3 parts of a coupling agent, 0.3-0.5 parts of a antioxidant, 0.5-2 parts of a solubilizing agent and 2-3 parts of water. The environment-friendly polyethylene plastic provided by the invention has the advantages of wide raw material source, short degradation time of products, good environmental protection, high tensile strength and elongation at break, good thermal stability and the like. The invention also provides a preparationmethod of the environment-friendly polyethylene plastic; the process route is simple; and industrial production is easy to realize.

The invention relates to the field of biotechnology and particularly relates to a method for reducing the content of cyanides in cassava residues. The method is characterized by comprising the following steps: mixing saccharomycetes and actinomucor elegans according to a volume ratio of (1-5):(1-3) to obtain a mixed bacterial solution, then mixing 10-20ml of the mixed bacterial solution and 180-250g of cassava residues, and carrying out fermentation at 25-31 DEG C for 48-96h. The method is simple and easy. By adopting a micro-biological degradation mode, the content of hydrocyanic acid can be greatly reduced, the cyanide degradation rate is more than 80%, the safety of the cassava residues serving as feed is improved, and the hydrocyanic acid can be decomposed and converted to non-toxic organic matters to serve as nutrients of the feed, thereby increasing the economic benefits of safe utilization of the cassava residues.

The invention discloses a straw decomposition agent. An active ingredient of the straw decomposition agent is prepared from actinomycetes, trichoderma harzianum, saccharomyces and bacillus subtilis which are in the bacterial flora formation unit number ratio of (0.5 to 2): (1 to 2): (0.8 to 1.2): 1. According to the straw decomposition agent disclosed by the invention, all bacterial florae can harmoniously coexist and mutually promote so as to achieve the effect of having complementary advantages, and lignin, cellulose, hemicellulose and the like in crop straws can be effectively decomposed; the degradation time is short, the decomposition effect is stable, diseases and insect pests are eliminated effectively, and the straw decomposition agent has a decomposition effect at normal temperatures, so that the rapid treatment of organic materials and final resource-converting utilization are achieved; treated organic solid wastes are transformed thoroughly, embody good properties of improving soil, promoting growth and inhibiting soil-borne diseases and meanwhile are environmentally friendly and sanitary.

The invention discloses a multistage dynamic temporary blocking volume acid fracturing method. According to the multistage dynamic temporary blocking volume acid fracturing method,"multistage physical temporary blocking" and "multistage chemical temporary blocking" are treated as principle thinking, and multistage hydraulic fracturing with sand and multistage injection acid fracturing are combined. According to pump injection sequence of front-loading linear glue with certain concentration to make seams, saturating a reservoir, improving flow conductivity of fractures by propping agents with the small grain size or composite grain size, and injecting degradable acid-resistant fiber temporary blocking fluid, through multistage with large displacement, the fracture physical steering transformation is achieved; and then through a multistage interval type with large displacement, different types of acid liquors "mutual solvent, gelled acid, steering acid..., mutual agent" are injected, and thus fracture chemical temporary blocking steering transformation is achieved. According to the multistage dynamic temporary blocking volume acid fracturing method,the pertinence and the flow conductivity of the reservoir are improved, the loss of the acid liquors are lowered, the etching length of the fractures are increased, the transforming volume of the reservoir is enlarged by fracture steering, and thus the target that the individual well producing rate is improved by effective transformation of the cloud-like carbonate rock reservoir is achieved.

The invention provides a preparation and control method of a catalytic electrode for bioelectrochemical and photoelectrocatalytic degradation of ethyl acetate and toluene, belongs to the technical fields of gas pollutant purification and volatile organic pollutant removal, and mainly relates to the preparation of a Ag/AgBr/TiO2-ZnO composite nanocatalyst. A silica solution is used for fixing a nano-catalytic material on a stainless steel network to be a catalytic cathode, a microbial fuel cell serves as an anode, electricity generated by microorganisms is guided out through carbon rods, the anode is connected with an external resistor through a circuit and forms a closed circuit with the cathode, and a photoelectrocatalytic coupled microorganism fuel cell system is constructed. A PEC-MFC system degrades ethyl acetate gas and toluene gas in a batch type system and a recycle system respectively, polluted gas is efficiently removed under visible light, and a new idea is provided for VOC control.

The invention relates to a disposable movement tooth protecting socket and a preparation method thereof. The preparation method of the disposable movement tooth protecting socket disclosed by the invention comprises purification and modification of konjac glucomannan, preparation of compound gel, degasification, molding and drying. The konjac glucomannan is taken as a carrier and assisted by other assistants; the disposable movement tooth protecting socket has excellent film-forming property, water-tightness, antibacterial property, large tensile strength, and good toughness; the konjac glucomannan is taken as a main material of the disposable movement tooth protecting socket. Compared with the existing movement tooth protecting socket, the disposable movement tooth protecting socket is high in tensile strength, and high in acid and alkali resistance, high-temperature resistance and antibacterial effect. The product is not degraded under normal use, can be completely degraded in soil under the conditions such as water, carbon dioxide, microorganisms, temperature and the like, is short in degradation time, convenient to draw materials, low in price and simple in production technology, accords with the national environment-friendly and low-carbon policy, and accords with the processing and production requirements of the disposable product. The disposable movement tooth protecting socket also has excellent performances such as antibacterial property, water resistance, breaking resistance, softness and the like.

The invention relates to a polymeric mesh implant for use in reconstruction of tissue defects, which mesh implant comprises a first set of fibers arranged in a first knit pattern comprising apertures, wherein each aperture, or a subset thereof, comprises an elastic fiber arranged in a first direction of the mesh implant such that when the mesh implant is stretched in this first direction, the elastic fibers are elongated and also exert a restoring force on the first knit pattern.

The invention provides a method for producing volatile fatty acid (VFA) through facultative anaerobic fermentation of kitchen waste. The method comprises the steps of pulverizing the kitchen waste into granules of which the diameters are less than 3mm, adding strains according to the volume ratio of the strains to the kitchen waste of 1: (1.5-2), adjusting the water content of the inoculated kitchen waste to 88-91%, mixing uniformly, performing the facultative anaerobic fermentation on the uniformly mixed kitchen waste at 34-37 DEG C, and adjusting process parameters according to the fermentation concentration. By adopting the method disclosed by the invention for hydrolyzing the kitchen waste, the time is short, the yield of VFA is high, and the hydrolysis rate is high; the kitchen waste can be efficiently recycled through the process for preparing marsh gas through anaerobic digestion after hydrolysis.

The invention relates to a bismuth subnitrate and bismuth oxy iodide composite light catalyst, a preparation method thereof and an application of the composite light catalyst. The method includes thesteps: 1) adding iodide salt water solution into a bismuth salt water solution according to the mole ratio of iodide salt to bismuth in bismuth salt at least containing bismuth nitrate of (0.5-1.5):1,and stirring mixture to obtain mixed solution; 2) transferring the mixed solution acquired in the step 1) into a high-pressure reactor, and performing hydrothermal reaction for 2-20 hours at the temperature of 100-200 DEG C to obtain the BiOI/Bi6O6(OH)3(NO3)3*1.5H2O composite light catalyst. The invention further discloses a light catalyst prepared by the method and an application of the light catalyst. The method is simple, the light catalysis activity of the prepared composite light catalyst is improved, and the removing ratio of rhodamine B in water can reach 95% or more under visible light.

The invention discloses a calcined anionic clay visible-light catalyst and a preparation method and purposes thereof. The catalyst is prepared by the following steps of preparing mixed solution of metal salts and urea; heating the mixed solution to the temperature of between 100 and 120 DEG, reacting for 36 to 54 h, and obtaining acidic turbid liquid of which the pH value is between 6.0 and 6.5; centrifuging the acidic turbid liquid, taking precipitation out, washing the precipitation by deionized water until the pH value is neutral, and dewatering and drying; and grinding the dried precipitation, calcining the precipitation at the temperature of between 400 and 900 DEG C for 4 to 6 h, and thus obtaining the calcined anionic clay visible light catalyst, wherein the metal salts comprise divalent metal salts and trivalent metal salts. The prepared calcined anionic clay visible light catalyst can catalytically degrade organic wastewater in visible light, ultraviolet light equipment is not required, a feeding ratio is low, the degradation time is short, and the calcined anionic clay visible-light catalyst has low energy consumption and high efficiency and is suitable for the treatment of medium and low-concentration industrial wastewater.

The invention discloses a method for manufacturing a magnesium phosphate bioceramic functional gradient bone regeneration scaffold. The method comprises the following steps: (1) preparing MgP powder;(2) preparing a MgP scaffold mixed solution; (3) preparing a HIPS porous support scaffold through 3D printing; and (4) preparing a blank MgP scaffold so as to obtain the MgP functional gradient bone regeneration scaffold. The scaffold material has a multi-scale pore structure, the inner layer has loose pores, and the pores are 300-500 [mu]m, not only can be beneficial to cell growth, but also canbe rapidly degraded and promote the formation of a natural bone structure; the outer layer scaffold is provided with dense pores, and the pores are 100-200 [mu]m, provide enough mechanical strength for the scaffold, provide longer degradation time, provide a stable regeneration microenvironment for internal bone regeneration, and have the effect of promoting bone defect regeneration and repair; and meanwhile, the surface of the scaffold material is also provided with micropores which are about 50 [mu]m and are beneficial to the adhesion of cells.

The invention relates to a resorbable multifilament comprising a number of individual resorbable filaments of a first type having a first degradation time and a number of individual resorbable filaments of a second type having a second degradation time, wherein the filaments of the first type and the filaments of the second type are arranged in close relationship to form a composite multifilament having a length and a specific composite cross-section comprising cross-sections of the individual filaments of the first type and second type, wherein the cross-sections of the individual filaments of the first and second type are located at determined relative positions, wherein the relative positions amongst the individual cross-sections of the filaments of the first and second types are invariant over the length of the composite multifilament.

The invention discloses breathable degradable dressing and a preparation method thereof. The dressing comprises, by weight, 34-58 parts of sodium carboxymethyl cellulose, 17-31 parts of hyaluronic acid, 5-19 parts of calcium alginate, 1-10.5 parts of beta-cyclodextrin, 2-9 parts of tributyl citrate, 9-20 parts of polyvinyl alcohol, 3-11 parts of ethylenediamine tetraacetic acid, 2-12 parts of nano-zinc oxide, and 1-8 parts of boric acid. The dressing prepared is high in degrading speed, good in breathability and free of allergy and has a promising market prospect.