113results about How to "Improve degradation efficiency" patented technology

Preparation method for magnetic nano biological microspheres for remedying soil polluted by organic chloride

The invention relates to a preparation method for magnetic nano biological microspheres for remedying soil polluted by organic chloride durably. The preparation method comprises the following steps of: (1) preparing nano Fe3O4 particles with the surfaces adsorbing amino by a coprecipitation method; (2) dissolving chitosan into an acetic acid solution to form a homogeneous transparent colloidal solution, and mixing and stirring the solution and the nano Fe3O4 particles to obtain the magnetic nano-particles; (3) adding the prepared magnetic nano-particles into a buffering solution of citric acid and performing ultrasonic dispersion to obtain magnetic fluid; and (4) adding the magnetic fluid into a bacterial solution, adding cross-linked fluid dropwise, performing adsorption-cross-linking, and performing solid liquid separation under the action of an external magnetic field to obtain the magnetic nano biological microspheres. The method is quick, simple, convenient and low in cost. The prepared magnetic nano biological microspheres have the characteristics of homogenous shape, large specific surface area, high microbial activity and the like and are applicable to degradation of organic chloride pollutant and in-situ remediation of polluted soil.

Single-layer bismuth tungstate nano-sheet composite photocatalyst modified by carbon quantum dots, preparation method of photocatalyst and application

The invention discloses a single-layer bismuth tungstate nano-sheet composite photocatalyst modified by carbon quantum dots, a preparation method of photocatalyst and an application. The composite photocatalyst comprises single-layer bismuth tungstate nano-sheets and the carbon quantum dots, the single-layer bismuth tungstate nano-sheets are modified by the carbon quantum dots, and the weight ratio of the carbon quantum dots to the single-layer bismuth tungstate nano-sheets is 0.03-0.05:1. The carbon quantum dots, hexadecyl trimethyl ammonium bromide, bismuth nitrate solution and sodium tungstate solution are mixed and react in a hydrothermal manner to obtain the composite photocatalyst. The composite photocatalyst has the advantages of wide visible light response range, high degradation efficiency, good photocatalyst stability and reusable performance and the like. The preparation method of the photocatalyst has the advantages that the preparation method is simple and convenient to operate, low in raw material cost and less in energy consumption, large-scale preparation can be achieved and the like. The composite photocatalyst belongs to green synthetic technique and can be used for treating antibiotic wastewater.

Rhodococcus strain C3, microbial agent containing rhodococcus strain C3, and applications of rhodococcus strain C3 and microbial agent

The invention discloses a rhodococcus strain C3. A preparation method of the rhodococcus strain C3 comprises the following steps of sucking an activated sludge sample from a wastewater biological treatment system of a coking plant to a fresh enrichment culture medium of phenol for shaking culture, wherein the inoculum concentration is 1%; after an enrichment bottle becomes muddy, taking a certain amount of the culture solution, inoculating a phenol liquid culture medium with increased concentration with the culture solution for culturing; in the same way, gradually increasing the concentration of phenol to 1000mg/L; inoculating an inorganic salt culture medium with the concentration of phenol being 1000mg/L with the strain enriched by the enrichment culture medium for domestication; and separating and screening a strain taking phenol as the unique carbon source and energy source from an isolation medium plate by adopting a dilution spread plate method and a streak plate A single colony of the strain is separated from an LB solid medium in a streaking manner, wherein the single colony is yellowish and semitransparent, has a neat edge and wet texture, and is easy to prick up; phenol, pyridine and o-cresol are taken as carbon sources, and the strain can degrade 1000mg/L of phenol in the inorganic salt liquid culture medium. The invention further provides a microbial agent taking rhodococcus strain C3 as the active component, and a preparation method of the microbial agent.

Method for treating domestic sewage by applying light ceramic suspended filler moving bed

The invention discloses a method for treating domestic sewage by applying a light ceramic suspended filler moving bed, which comprises the following steps of: pumping low-concentration town sewage into a hydrolytic acidification tank by using a lift pump, maintaining the sewage in the hydrolytic acidification tank for 3 to 8 hours, and controlling the dissolved oxygen to 0.38-0.45mg/L; making the sewage to enter a suspended filler moving bed; under the action of aeration stirring of an aerator pipe, mixing the sewage and a suspended ceramic filler, and breeding microorganisms on the surfaces and pores of the suspended ceramsites; after film formation, forming aerobic, anoxic and anaerobic environment on the surfaces and in the pores of the suspended ceramsites, adsorbing organic matters in the sewage on the surfaces of the suspended ceramsites, and performing simultaneous nitrification-denitrification and simultaneous decarbonization-denitrification on the organic matters by the microorganisms in the biofilm; and finally, making the sewage enter a dosing and coagulating basin, adding a coagulant into the dosing and coagulating basin, fully reacting, and making the sewage enter an inclined-tube sedimentation tank for sedimentation. The method has the characteristics of short hydraulic retention time, land conservation, investment conservation and low operating cost.

Preparation method of zinc oxide nanorod/g-C3N4 nanosheet composite photocatalyst material

The invention provides a preparation method of a zinc oxide nanorod/g-C3N4 nanosheet composite photocatalyst material. The zinc oxide nanorod/g-C3N4 nanosheet composite photocatalyst material is prepared by adopting melamine, zinc acetate dehydrate, sodium hydroxide, hexadecyltrimethyl ammonium bromide and absolute ethyl alcohol as main raw materials through a hydro-thermal synthesis method; zinc oxide in the composite material is a one-dimensional zinc oxide nanorod with uniform morphology; the morphology of g-C3N4 is a two-dimensional nanosheet structure. The product respectively degrades an organic pollutant rhodamine B under simulated sunlight and visible light (lambda is larger than 420nm), so that the photocatalyst material is proved to have an excellent photocatalytic performance. The morphology and the size of the zinc oxide nanorod prepared by the method are uniform, and the thickness of the g-C3N4 nanosheet is less, so that the zinc oxide nanorod and the g-C3N4 nanosheet are tightly combined, the migration of photo-induced electron is facilitated, and the photocatalysis efficiency is improved. The material has good response in ultraviolet and visible light areas, so that the material not only has a better application prospect on the environmental protection field such as water pollution control, but also has a better development prospect on developing and utilizing renewable resources such as solar energy.

Method for treating organic waste water by catalyzing persulfate by means of microwave-ultraviolet coupling

The invention provides a method for treating organic waste water by catalyzing persulfate by means of microwave-ultraviolet coupling. The method comprises the following steps: adding the persulfate into the organic waste water, putting the organic waste water containing the persulfate into a container in a microwave generation device, wherein the container is internally provided with an ultraviolet light generation device, turning on the microwave generation device, using microwave to excite the ultraviolet light generation device, and degrading the organic waste water under the action of catalyzing and activating the persulfate by means of microwave and ultraviolet coupling. According to the method, the persulfate is catalyzed and activated by a microwave and ultraviolet coupling method so as to generate sulfate radicals, and an oxidization system based on the sulfate radicals is formed, so that organic pollutants in the waste water are effectively degraded; in the processes of catalysis and activation, metal ions are not dissolved out in the system, so that secondary pollution is avoided; furthermore, the method is higher in degradation efficiency of organic matters in the waste water under the acidic, neutral and alkaline conditions, so that the waste water can be stably treated under the conditions of multiple pH values.

Ion exchange type COF-coated MOF/M composite material and preparation method thereof

The invention discloses an ion exchange type COF-coated MOF/M composite material and a preparation method thereof, and the preparation method comprises the following steps: firstly synthesizing an MOF crystal material, then synthesizing a COF-coated MOF material, and finally introducing exchange metal ions to form the ion exchange type COF-coated MOF/M composite material. After the COF-coated MOF core-shell structure is synthesized, metal ions are fixed at nodes of the core-shell structure, so that the monatomic catalytic activity is exerted; MOF is coated with COF to form a COF-coated MOF core-shell structure, on one hand, a multi-stage pore channel structure is formed, a layer-by-layer progressive effect is achieved when pollutant small molecules are adsorbed, a nano confinement effect is formed in the middle of a sheet layer, and the catalytic performance is improved, and on the other hand, due to the fact that the stable shell structure MOF of the COF cannot cause structural collapse in the metal ion exchange process, and the shape of the original framework is maintained; when the ion exchange type COF-coated MOF/M composite material prepared by the method disclosed by the invention is used for catalyzing styrene degradation, the degradation efficiency is obviously improved by more than 30%.

Method for degrading pentadecafluorooctanoic acid or perfluorooctane sulfonate through irradiation

The invention relates to a method for degrading pentadecafluorooctanoic acid or perfluorooctane sulfonate through irradiation. The method includes the specific steps that a 20 mg/L pentadecafluorooctanoic acid aqueous solution and a 20 mg/L perfluorooctane sulfonate aqueous solution are prepared respectively, the pH value is adjusted to be 3-13, nitrogen and oxygen are introduced or a tert butyl alcohol solution is added, and the mixture is irradiated by electron beams; the energy of accelerated electrons of an accelerator is 1.8 MeV, the intensity of electronic beam current is 0-10 mA, processing time is 60-120 s, and irradiation dose is 100-500 kGy. The method has the advantages that degradation efficiency is high, reaction speed is high, generated radicals are high in oxidization and reduction performance, the applicability range is wide, controllability is high, the method can be matched with other processing technologies in use so as to reduce cost and meet processing requirements, and the method is an efficient energy-saving water treatment technology. By treating pentadecafluorooctanoic acid or perfluorooctane sulfonate in water through the electron beam irradiation method, quick degradation and effective defluorination can be achieved, and application prospects are good.
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