52results about How to "Good degradation activity" patented technology

A preparation method for a visible light photocatalyst powder and cloth from a bismuth-rich material comprises the steps: dissolving the bismuth-rich material and dithiocarbamate in solvents respectively, and adding the dithiocarbamate solution to the bismuth-rich solution drop by drop to produce a precipitate; filtering, washing and drying, to obtain a metal element-doped bismuth dithiocarbamate;dissolving the prepared metal element-doped bismuth dithiocarbamate in a good solvent, adding macromolecules, carrying out electrostatic spinning, and thus obtaining the cloth with a photocatalytic function. The prepared metal element-doped bismuth dithiocarbamate has the advantages of uniform morphology and size, good dispersibility, green and environmental protection, stability in air, water and most solvents, acid and alkali resistance, industrial mass production potential, and excellent photocatalytic pollutant degradation activity, and realizes the direct conversion and reuse of the bismuth-rich material; the photocatalytic cloth can effectively prevent the diffusion of the catalyst powder and realizes the effective recycling of the photocatalyst.

The invention discloses acyl-homoserine lactone degrading bacteria and application of the acyl-homoserine lactone degrading bacteria in disease control. The degrading bacteria are Acinetobacter schindleri and particularly refer to an acinetobacter strain XJ-10, the strain is collected in the China Center for Type Culture Collection on 2nd, November, 2017, and the collection number is CCTCC NO:M2017650. The strain can degrade quorum sensing signal molecules, is used for unique carbon source growth, and has a remarkable and rapid degradation effect on the AHLs quorum sensing signal molecules. Thus, microbial quorum sensing communication can be blocked through degradation of the quorum sensing signal molecules, expression of pathogenic factors of pathogenic bacteria is restrained, the purposeof disease control is achieved, and great application potential is achieved in the aspect of controlling the harm of pathogenic bacteria depending on AHLs mediated pathopoiesis. The problem of abuseof chemical pesticide can be solved, and meanwhile a novel strategy is provided for biologically controlling phytopathogen harm.

The invention discloses Rhodococcus sp.QY-2 having a low-temperature petroleum degrading function and collected under CGMCC No.11634. The Rhodococcus sp.QY-2 is screened from a sea area polluted by petroleum in North China, can efficiently degrade petroleum at low temperature, especially in extreme environment of 0 DEG C. The Rhodococcus sp.QY-2 can be applied in bioremediation of sea petroleum pollution, especially in petroleum spilling bioremediation at low temperature in the sea area in North China in winter (including glacial period).

The invention discloses preparation and an application method of a special microorganism composite bacterial agent for directly decomposing and fermenting crop straws to generate marsh gas. The special microorganism composite bacterial agent is liquid or solid, and is formed by fermenting, culturing, combining and compositing of one or more of bacillus cereus, bacillus subtilis, bacillus licheniformis, bacillus megaterium, bacillus mucilaginosus, bacillus circulans, bacillus sphaericus, clostridium sporogenes, clostridium acetobutylicum, clostridium pasteurianum, clostridium beijerinckii, clostridium thermocellum, trichoderma viride, trichoderma pseudokoningii and aspergillus niger. Meanwhile, by taking the special microorganism composite bacterial agent as an inoculation bacterial agent,the invention provides the application method for decomposing the crop straws and accelerating the fermentation to generate marsh gas; the crop straws treated by the microorganism composite bacterialagent have fast fermentation speed, large marsh gas generation quantity, low treating cost and no secondary pollution, can be fermented to generate the marsh gas under the condition of no any faeces of poultry and livestock, and the application range is quite wide.

The invention belongs to the technical field of catalytic material preparation, and particularly relates to a magnetic Fe2O3/BN composite material and a preparation method and an application thereof.The positive-valent iron ions are adsorbed on BN by utilizing electronegativity of the surface of BN, so that the magnetic Fe2O3/BN composite material is prepared by a one-pot method and is applied toremoval of antibiotic residues in a water body. The synthesis method is simple, and the prepared magnetic Fe2O3/BN composite material has good magnetism and is easy to recycle. In a photocatalysis experiment, the magnetic Fe2O3/BN composite material shows degradation activity superior to that of a monomer. The material can be used as a catalyst for PDS activation; peroxydisulfate (PDS) is subjected to photo-synergistic activation to remove wastewater pollutants, free radicals with strong oxidizing ability generated by PDS activation and free radicals generated by photocatalytic excitation ofFe2O3 realize dual-promotion catalytic action, and application of the iron-based composite material in the field of photocatalysis and in the aspect of PDS activation is further developed.

The invention discloses a disease control strain adopting quorum sensing signal molecules AHLs as a target and application thereof. A preservation number of the strain is GDMCC (Guangdong Microbial Culture Collection Center) 60434. The bacillus cereus has good degradation activity for the quorum sensing signal molecules AHLs, is stable and significant in degradation effect, and has vast application potential in the aspect of preventing AHLs-mediated disease pathogenic bacteria, thereby providing a novel way and method for biological prevention and control of the disease.

The invention discloses a visible light responsive nitride photocatalytic material and a preparation method. The preparation method comprises: growing multiple layers of GaN-based epitaxial thin films in PIN heterostructures on a sapphire substrate by adopting a MOCVD technology; using an InGaN/GaN multiple quantum well or a superlattice as a light absorption layer; and then transferring the GaN-based epitaxial thin films to a conductive substrate, and peeling the sapphire substrate to obtain the photocatalytic material. By adopting the InGaN/GaN multiple quantum well or a superlattice as the light absorption layer, the difficulty of growing thick InGaN by MOCVD is overcome; by doping the In component, the photocatalytic material has visible light responsiveness; photon-generated carriers can be effectively separated as a result of a built-in electric field in the PIN heterostructures, so that the material has a high photovoltaic conversion efficiency, and the catalytic activity of the material is greatly improved. The photocatalytic material illuminated by visible light shows excellent degradation activity to azo dyes such as methyl orange and the like, so that the photocatalytic material can be used as an electrode of a photoelectrochemical pool for degrading organic pollutants.

The invention relates to a streptomyces polysaccharide degradation bacterium as well as a culture method and application thereof. A streptomyces sp. CB16 strain is preserved in China General Microbiological Culture Collection Center on April 11, 2016 and the preservation number is CGMCC No.12351. The invention further relates to the culture method and the application of the strain. The strain provided by the invention is a multifunctional polysaccharide degradation bacterium; a compound type polysaccharide degradation enzyme preparation prepared from the strain can be used for degrading plant, seaweed, animal and microorganism polysaccharides and particularly has remarkable degradation activity on hyaluronic acid, chondroitin sulfate A, chondroitin sulfate C and chondroitin sulfate E from connective tissues of higher animals; and the streptomyces polysaccharide degradation bacterium has a potential application value and has functions which are completely different from functions of existing streptomyces sp.

The invention discloses an isoepitaxial-growth gallium-nitride-base photocatalytic material and a preparation method thereof. The gallium-nitride-base photocatalytic material sequentially comprises an n-type gallium-nitride-base substrate, a gallium-nitride-base epitaxial layer and a metal layer from bottom to top. The GaN-base photocatalytic material isoepitaxial growth on the n-type gallium-nitride-base substrate is adopted to solve the problem of poor epitaxial layer crystal quality of the heteroepitaxy growth due to lattice mismatch and thermal mismatch, thereby omitting the step of growing the buffer layer and other steps for enhancing the heteroepitaxy grown crystal quality. By adopting the n-type gallium-nitride-base substrate, the substrate and GaN-base epitaxial layer grown by MOCVD (metal-organic chemical vapor deposition) together constitute the PIN heterostructure, and the photon-generated carrier can be effectively separated under the action of the built-in field, thereby enhancing the catalytic activity of the material. The nitride photocatalytic material has excellent degradation activity for methyl orange and other azo dyes under the irradiation of light, which indicates that the photocatalytic material has potential application value in the field of photocatalysis and has wide application prospects in the aspect of sewage treatment.

Disclosed is a method for extracting lignin by using a mixed solvent two-step method. In the method, two mixed solvents with different properties are used as extracting agents for continuous extraction in an inert condition by two steps, so that lignin in lignocellulosic biomass is separated high effectively. The mixed solvents used in the method are separately an alcohol/water system and an ether/water system, and after extraction of the lignin, the used solvents can be recycled can used reused. The method provided by the invention can be used to separate lignin high effectively, and the obtained lignin by separation has good degradation activity, so that the method is easy to use for high-value use of lignin, and has an important application value.

The invention relates to a method of reducing sludge of petrochemical wastewater by aerating combination of ozone and pure oxygen, belonging to the technical field of environmental engineering. Aiming at the characteristics of petrochemical wastewater, sludge of petrochemical wastewater is reduced by controlling ozone oxidization and pure oxygen aeration by adopting a special process condition. Ozone oxidization treatment is carried out according to 40-50% of a theoretical output of residual sludge, and the oxidization time is controlled within 28-35 minutes, so that the field sludge reduction efficiency is controlled within 72.7-81.5%. Meanwhile, COD (Chemical Oxygen Demand) of effluent reaches the standard, so that the sludge is reduced, while the method is high in treatment efficiency, low in energy consumption and low in operating cost.

The invention discloses Pseudoalteromonas sp.DC-2 having a low-temperature petroleum degrading function and collected under CGMCC No.11633. The Pseudoalteromonas sp.DC-2 is screened from a sea area polluted by petroleum in North China, can efficiently degrade petroleum at low temperature, especially in extreme environment of 0 DEG C. The Pseudoalteromonas sp.DC-2 can be applied in bioremediation of sea petroleum pollution, especially in petroleum spilling bioremediation at low temperature in the sea area in North China in winter (including glacial period).

The invention discloses an alpha-Fe2O3 photocatalyst rich in cationic defect cluster, and relates to the technical field of semiconductor photocatalysis. The alpha-Fe2O3 nanoparticles rich in cationicdefect cluster are in spindle type nanorod shapes having a size distribution of 80 to 500 nm. The invention also discloses a preparation method and application of the photocatalyst. The invention hasthe beneficial effects of being able to solve the problem that a TiO2 catalyst is difficult in utilizing visible light and has organic matter degradation activity under visible light irradiation, is82%, 47% and 70% higher than alpha-Fe2O3 nanoparticles having no defect, alpha-Fe2O3 nanoparticles rich in iron atom vacancy defect and alpha-Fe2O3 nanoparticles rich in iron atom vacancy defects in the photocatalytic activity respectively, has good cycle stability and can be reused many times.

The invention discloses a preparation method of a mesoporous cobalt-system carbon-silicon nanosphere Fenton catalyst. The method comprises the steps of first mixing solution preparation, solid productpreparation and roasting. The invention further discloses the mesoporous cobalt-system carbon-silicon nanosphere Fenton catalyst and the application of the mesoporous cobalt-system carbon-silicon nanosphere Fenton catalyst in catalytic degradation of organic pollutants. The mesoporous cobalt-system carbon-silicon nanosphere Fenton catalyst prepared by means of the method has the advantages of high catalytic activity, high stability, convenient recovery and recycling and the like.

The invention discloses a Fe-doped g-C3N4 photocatalyst and a preparation method and application thereof. The Fe-doped g-C3N4 photocatalyst is obtained from pig blood and melamine through a one-step thermal polymerization method, and the obtained product can be combined with photo catalysis and a Fenton oxidation reaction process under the visible light condition to conduct combined degradation of pollutants; and the photocatalyst prepared in the invention has a stable Fe-N bond in the structure, so that the photocatalyst does not easily react with hydroxide in an alkaline environment to form an iron-based hydroxide precipitate, the defect that the activity of a common Fe-doped photocatalyst is reduced in a Fenton process under an alkaline condition is overcome, and therefore, the catalyst can maintain good degradation activity in a wide pH range.