301 results about "Methyl blue" patented technology

The invention provides a grading three-dimensional porous graphene/titanium dioxide photocatalyst and preparation method thereof. The photocatalyst is composed by a three-dimensional grapheme framework and nano titanium dioxide particles; the grahene is provided with a macroporous structure; titanium dioxide is mesoporous titanium dioxide; the macropores and the mesopores are communicated; the nano titanium dioxide particles are scattered on a grapheme nano sheet; the surfaces of nano titanium dioxide microspheres are wrapped with graphene nano sheets; the macropores of the graphene are filled with the nano titanium dioxide microspheres. The photocatalyst with a three-dimensional structure can not only prevent the graphene sheet layers from stacking, but also scatter titanium dioxide particles excellently, and is high in specific surface area; besides, samples can be used for photocatalysis degradation of methylene blue, and the methylene blue can be fully degraded in 25 minutes. The preparation method provides a new thought for preparation of the photocatalyst, and has a potential application value in the fields of energy sources and environment.

The invention discloses a method for degrading organic waste water by photo-assisted activation of potassium hydrogen persulfate through bismuth ferrite, belonging to the technical field of waste water treatment. A perovskite structure BiFeO3 in the invention has a spherical morphology and is prepared by adding a certain amount of a surface active agent under hydrothermal conditions; the specific surface area is high; and the prepared BiFeO3 self can degrade organic pollutants by photocatalysis under the irradiation of visible light. According to the method disclosed by the invention, BiFeO3 is applied to degrading the organic pollutants by activating potassium hydrogen persulfate; the methyl orange degradation rate within 15 min is 94%; the methyl blue degradation rate within 40 min is 90%; the rhodamine degradation rate within 40 min is 65%; by means of combined use of BiFeO3 and potassium hydrogen persulfate, the organic pollutants are oxidized and degraded; the organic pollutants can be effectively degraded under better illumination conditions; the organic pollutants can also be effectively oxidized and degraded without light or under poor illumination conditions; and therefore, the method has good application prospect.

The invention provides a method for preparation of photo-catalytic nitrogen doped nano titanium oxide having visible light activity, belonging to the art of preparing titanium oxide powder. With directive thermal treatment, mix nano TiO2 powder, TiO2 colloid or Ti (OH) 4 with nitrogen source and water proportionally to prepare mixture suspension, mix around for among 0.5- 1h in among 10- 30Deg. C, dry for among 30- 90Deg. C, thermally treat for among 300- 650Deg. C and keep 0.5- 6h, then the anatase- type nitrogen doped nano titanium oxide powder is prepared. The merit is characterized in that: the property simulation of the prepared anatase- type nitrogen doped nano titanium oxide powder contains: measuring the phase constituent and the grain size number by X- ray diffraction, measuring light absorption by ultraviolet- visible light defuse reflection. measuring the absorption spectrum of photodegradation methyl blue solution with ultraviolet- visible light spectrophotometer.

The invention discloses a visible-light-induced photocatalyst Bi4O5Br2 and a preparation method thereof. According to the visible-light-induced photocatalyst Bi4O5Br2 and the preparation method thereof, an improved low-temperature hydrothermal method is adopted, composition of Bi, O and Br in BiOX is controlled by controlling amount of a bismuth source and a bromine source, and a novel layered-cake-shaped visible-light-induced photocatalyst Bi4O5Br2 is prepared successfully. The preparation method is simple in production process, easy to operate, low in synthesis temperature, high in reaction yield, environment-friendly and low in cost and meets the requirement of actual production, the reaction yield is 92%, and raw materials are easy to obtain. The visible-light-induced photocatalyst has good visible-light catalytic activity, can completely degrade various organic pollutants such as rhodamine b, methyl orange and methylene blue in short time under the visible light irradiation, is small in light corrosion and good in reusability, can be applied to industrial production and particularly has a better application value in organic pollutant degradation through solar photocatalysis, and the market potential is large.

The invention discloses a preparation method and application of a novel silver-nanoparticle modified ultrathin graphite phase carbon nitride catalyst. The method includes: subjecting urea to heat treatment to obtain lump graphite phase carbon nitride; subjecting the lump graphite phase carbon nitride to secondary heat treatment to obtain an annealing etched ultrathin graphite phase carbon nitridelayer; structuring a bionic mussel polydopamine biocoating on ultrathin graphite phase carbon nitride by adopting an impregnation method; based on polydopamine modification and by the aid of reducibility of silver nanoparticles, loading the silver nanoparticles on the surface of the ultrathin graphite phase carbon nitride. The two-dimensional ultrathin graphite phase carbon nitride layer is prepared by adopting the high-temperature annealing method, the silver nanoparticles are prepared by adopting the green bionic method of self-polymerization polydopamine, and good prospects of the novel composite high-activity photocatalyst are displayed in the field of organic pollutants like photocatalytic degradation of methylene blue and phenol.

The invention belongs to the technical field of chemical adsorption materials, and particularly relates to a nitrogen-doped magnetic porous carbon material as well as a preparation method and application thereof. A nitrogen-doped porous magnetic material N-PMC is successfully synthesized by utilizing a one-pot method, and the material has a relatively high specific surface area, developed porosityand a nitrogen-doped alkaline active site. The preparation method and the obtained product have the following advantages: (1) simple synthesis with the one-pot method, (2) large specific surface area, (3) ultrahigh methyl blue (MB) adsorption capacity, and (4) short adsorption time; the N-PMC has an ultrahigh MB adsorption capacity, wherein the maximum adsorption capacity is 1053.5 mg/g<-1>, andis far greater than that of an MB adsorbent reported in current literatures. In addition, the N-PMC has extremely good recyclability, and the material can be quickly separated from a solution under the action of an external magnetic field. The N-PMC is very likely to become an adsorbent, which has the broadest application prospects, for adsorbing the MB in water.

The invention discloses a silver chloride-silver phosphate composite photocatalyst and a preparation method thereof. In the composite photocatalyst, the mole percent ratio of silver chloride and silver phosphate, i.e. silver chloride: silver phosphate, ranges from 1:0-0.3. The preparation method comprises the steps of: preparing a mixed solution of chloride ions and phosphate ions first, and then adding Ag+ ions to the mixed solution, thus obtaining the silver chloride-silver phosphate composite photocatalyst. Application of the silver chloride-silver phosphate composite photocatalyst provided in the invention to photocatalytic degradation of the organic pollutant methylene blue can greatly improve the reaction activity of a silver chloride photocatalyst. In addition, the preparation method of the silver chloride-silver phosphate composite photocatalyst in the invention is simple and practicable, thus benefiting large-scale popularization.

The invention discloses a preparing method and application of a nitro phthalocyanine zinc/sulfur-containing carbon nitride composite catalyst and belongs to the field of preparation of photocatalytic materials. The preparing method of the nitro phthalocyanine zinc/sulfur-containing carbon nitride composite catalyst comprises the following steps that 1, the composite catalyst is prepared, wherein nitro phthalocyanine zinc and sulfur-containing carbon nitride are prepared respectively, then a nitro phthalocyanine zinc/sulfur-containing carbon nitride composite material (ZnTNPc-CNS) is prepared through the dipping method, and a series of composite materials are prepared by adjusting the different sulfur content of the carbon nitride; 2, the property characterization of photocatalytic degradation of the organic pollutant-methylene blue is achieved, wherein the effect of degradation of methylene blue by pure nitro phthalocyanine zinc is not obvious, and the photocatalytic degradation effect is obviously improved after the nitro phthalocyanine zinc is combined with the sulfur-containing carbon nitride. The novel nitro phthalocyanine zinc/sulfur-containing carbon nitride composite material prepared through the method has good methylene blue photocatalytic degradation performance and is an environment-friendly and efficient photocatalyst.

The invention discloses a photocatalyst for degrading dye in wastewater and a preparing method thereof, and belongs to the field of photocatalysis. The photocatalyst for degrading the dye in the wastewater is characterized in that mesoporous silica serves as carriers, copper-element-doping nano-zinc oxide is loaded on the mesoporous silica carriers, the mass percent of zinc elements ranges from 5% to 40%, and the mass percent of the copper elements ranges from 0.1% to 5%. The photocatalyst for degrading the dye in the wastewater is used for catalytic degradation of methylene blue or rhodamine b, and is capable of achieving visible-light responses, low in cost, high in degradation efficiency and good in stability.

The invention relates to a preparation method and application of a magnetic MOF composite and belongs to the technical field of material preparation. The preparation method comprises the following steps: preparing superparamagnetic ferroferric oxide nanoparticles by adopting a solvent thermal process, taking superparamagnetic ferroferric oxide as a core, coating a silicon dioxide shell on the surface of ferroferric oxide by adopting a hydrolysis method, so that Fe3O4@SiO2 nanoparticles are obtained, dissolving ferric trichloride hexahydrate and terephthalic acid into methylene formamide (DMF) to obtain DMF mixed liquor, then adding the Fe3O4@SiO2 nanoparticles and the DMF mixed liquor into a reaction kettle, and reacting, so that the magnetic MOF composite is obtained. The magnetic MOF composite can be used for adsorption of organic dye methylene blue.

The invention discloses a novel preparation method of a titanium dioxide-cellulose composite material. The novel preparation method comprises the following steps: preparing mixed liquor of titanium tetrachloride and water at a low temperature; and then adding cellulose as a template to carry out heating treatment to obtain the composite material with titanium dioxide nano crystals loaded on the cellulose. The novel preparation method disclosed by the invention is simple in preparation condition, convenient to operate and easy in mass production; the titanium dioxide-cellulose composite material obtained by the novel preparation method has very strong catalytic ability under visible light, and can be used for performing quick catalytic degradation on organic substances such as rhodamine B and methylene blue.

The invention relates to a preparation method and application of a nano MFe2O4 supported hollow fiber composite ceramic membrane having catalytic separation function, pollution resistance and low energy consumption, and belongs to the field of application of inorganic ceramic membranes in water treatment. A hollow fiber ceramic membrane is used as a support, stable nitric metal salt of citric acid is used as a catalyst mother liquid, and dipping and temperature calcining process is performed to prepare the nano MFe2O4 supported hollow fiber composite ceramic membrane. In in-situ coupling with the sulfuric free radical advanced oxidation technique, the nano MFe2O4 supported hollow fiber composite ceramic membrane can be applied to the treatment of low-concentration organic wastewater, such as dye wastewater and medicine and personal nursing product wastewater, in order to efficiently remove typical contaminants, such as methyl blue, rhodamine B and ibuprofen drugs, with the removal rate stilling being 91.8% and above in 55-60 min while methyl blue wastewater concentration is </=25 mg/L and water level is 30 cm (2.94 kPa); similarly, the removal rate of rhodamine B is 90.7%; after 1 h of operation, when ibuprofen wastewater concentration is </=10 Mu mol/L, the removal rate of ibuprofen is kept to 99.5% and above.

The invention relates to a preparation method of a compound nanotube photocatalytic film of titanium dioxide and silicon dioxide, which belongs to the field of nanofilms. At present, the problem of easy compound of photo-excited holes and electron pairs of a titanium dioxide photocatalytic film causes that the titanium dioxide photocatalytic film has lower efficiency when being applied to sewage treatment. The preparation method comprises the following steps: adopting anodic aluminum oxide (AAO) as a template and dipping the AAO into a mixed solution of (NH4)2TiF6 and (NH4)2SiF6 at 30-40 DEG C for co-deposition in-situ growth by utilizing a liquid-phase deposition method so as to prepare the compound nanotube photocatalytic film of titanium dioxide and silicon dioxide with a good appearance; after cleaning and drying the prepared film, preparing the compound nanotube photocatalytic film of titanium dioxide and silicon dioxide with high photocatalytic performance by carrying out heat treatment and preserving heat for 2-4 hours at 400-600 DEG C. The preparation method completes the nanofilm and compound treatment at one time, and the film has strong repeatability, is convenient for mass production and can get a treatment efficiency of 70-95 percent after being applied to a photocatalytic reaction of a methyl blue solution of 100mg/L (0.1wt%).

The utility model discloses a method for detecting blood homocysteine and a kit in the field of biological detection technologies. The kit comprises a kit body, a 96-pore plate, HCY standard substance, HCY specific convertase, a reducing agent, a buffer solution, color developing liquid A and color developing liquid B, wherein the 96-pore plate, the HCY standard substance, the HCY specific convertase, the reducing agent, the buffer solution, the color developing liquid A and the color developing liquid B are arranged in the kit body. The kit utilizes HCY in rHCYase decomposed blood to produce H2S, produced H2S is reacted with dimethyl-p-toluidine to produce methyl blue, and the HCY content in the blood is reflected through the methyl blue generating amount. The kit is simple in operation, a reagent is good in stability and high in repeatability, and the method is flexible and suitable for quick clinical HCY detection of laboratories.

The invention discloses novel heterotantalate. A chemical formula of the novel heterotantalate is K3[H3P4(TaO2)6(OH)4O20].12H2O, the crystal belongs to the monoclinic system, the space group is P2(1/C), the lattice parameter is a=12.6862(10)angstrom, b=9.9322(8)angstrom, c=16.8359(13)angstrom, and beta=105.3940(10)angstrom. The novel heterotantalate is prepared by enabling potassium hexatantalate to react with phosphoric acid under a conventional hydrogen peroxide solution condition. The material has high stability, and has the performances of photocatalytically degrading Rhodamine B, azophloxine and methyl blue; furthermore, the novel heterotantalate is simple in preparation process, easy to operate, low in cost, high in yield, and has a potential application prospect.

The invention belongs to the technical field of dye adsorption, and especially relates to a longan shell dye adsorbent and a method for adsorbing methylene blue dye in water. A preparation method of the dye adsorbent is as below: first washing waste longan shell with tap water, washing with distilled water several times, removing impurities, separating by filtration and drying; and finally, conducting mechanical crushing and screening to obtain a sample of longan shell adsorbent used for adsorption of methylene blue. The present invention has the following advantages: the adsorbent use non-toxic and inexpensive materials with rich resources; the preparation of the adsorbent does not involve chemical modification, and is simple and feasible; the adsorption process has the characteristics of less equipment and facilities, simple steps, high adsorption rate and high adsorption efficiency; and the highest removal rate of methylene blue dye can reach 96.75%, and the maximum adsorption capacity can reach 136.44mg / g. Accordingly, the longan shell adsorbent is an economical environment-friendly efficient methylene blue adsorbent.

The invention discloses a method for determining hydrogen sulfide in blood and urine through combination between dispersive solid-phase microextraction and high performance liquid chromatography. Methylene blue is formed by free H2S, HS- and S2- in serum and the urine, N,N-dimethyl-p-phenylenediamin dihydrochloride and ferric chloride through derivation under the acidic condition, a modified magnetic nanometer material is added to adsorb the methylene blue, the magnetic material and a substrate are separated under the action of an external magnetic field, and interference of macromolecular substances in the blood and the urine to determination is eliminated; the magnetic material is eluted through a little eluent, quantitative determination is conducted on the eluent through the high performance liquid chromatography, and the detection limit can be 0.005 microgram per milliliter. The method has the advantages of being high in accuracy and sensitivity, simple and rapid.

The invention discloses a preparation method of a three-dimensional graphene based proportional signal amplification aptasensor. The method adopts a gold nano-three-dimensional graphene compound as the modified electrode substrate material, then grafts ferrocene-labeled mucin aptamer to gold nanoparticles on a three-dimensional graphene surface, and employs bovine serum albumin to close non-specific sites on a sensing interface, and when the ferrocene-labeled aptamer captures mucin to an electrode surface, a methyl blue labeled mucin aptamer-gold nano compound is employed for co-incubation, thus obtaining the aptasensor for electrochemical detection. According to the invention, the aptamer is employed to construct a sensing interface, and is conducive to enhancing the stability and selectivity of the sensor; at the same time, the two electroactive substances ferrocene and methyl blue are introduced into the sensing system to play an internal reference role and a signal amplification role respectively. The construction method of the proportional signal amplification aptasensor has the advantages of high sensitivity, good stability, simple method, high cost-effectiveness, etc.

The invention discloses an adsorbing agent capable of selectively removing dyes containing sulfonic acid groups in wastewater and a method of the adsorbing agent. Nanometer flake basic copper nitrate is used as the adsorbing agent to remove the dyes containing the sulfonic acid groups in the wastewater. The adsorbing agent can be put into a single dye (Congo red or methyl blue or methyl orange) solution containing sulfonic acid groups, and the adsorbing agent can also be put into a mixed solution of Congo red and methyl blue and a mixed solution of methyl orange and methyl blue. It is shown through results that the adsorbing agent achieves a very high adsorbing quantity on the dyes containing the sulfonic acid groups and can selectively adsorb the dyes containing the sulfonic acid groups.

The invention provides a preparation method of a sheet-shaped g-C3N4 composite petal-shaped BiOBr photocatalytic material(BiOBr/g-C3N4 photocatalytic material). The method comprises the steps of usingcerium nitrate pentahydrate, cetyltrimethylammonium bromide, bismelamine, ethylene glycol and nitric acid (2mol/L)as main raw materials, using solvothermal synthesis to prepare the BiOBr/g-C3N4 photocatalytic material, using an xenon lamp as a light source to simulate sunlight, filtering 420 nanometre ultraviolet light (lambade), and conducting photocatalytic performance testing on the BiOBr/g-C3N4 photocatalytic material; degrading toxicorganic pollutants such as methyl orange, methylene blue, rhodamine B and the like in water to prove that the BiOBr / g-C3N4 photocatalytic material has good photocatalytic properties under visible light. The BiOBr/g-C3N4 photocatalytic material is a composite of a non-metal semiconductor and a hafnium oxyhalide material, a special band structure and good optical properties are the basis of being a photocatalyst, the material has the advantages of being non-toxic, inexpensive and easy to prepare, and the material has broad application prospects in the treatment of the pollutants and the development of new energy sources by using the solar energy.

The invention discloses a cadmium sulfide photocatalyst with high photocatalytic activity and a preparation method thereof. The cadmium sulfide photocatalyst has a hollow micro-sphere structure. According to the preparation method, an alcohol-thermal method is utilized, and the preparation method comprises the following steps of: taking ethanol as a solvent, adding a sulfur source and a cadmium source into the solvent, transferring into a high-pressure kettle, controlling the temperature to be 150 DEG C, carrying out a heating reaction, naturally cooling to a room temperature, washing the obtained precipitate until the effluent is neutral, performing vacuum drying to obtain the cadmium sulfide photocatalyst. According to the cadmium sulfide photocatalyst with high photocatalytic activity, the reaction activity when the photocatalytic degradation is conducted on organic pollutants such as methylene blue is high; and moreover, the preparation method is easy and feasible, the production cost is low, pollution does not exist in the production process, and the cadmium sulfide photocatalyst is suitable for industrial large-scale production.

The invention discloses a preparation method and application of an oxygen-doped molybdenum disulfide material with defects. The method comprises the steps: dissolving ammonium molybdate tetrahydrate and thiourea in water to obtain a mixture; adding the mixture into a reaction kettle, and carrying out hydrothermal reaction for 12-24 h at the temperature of 200-250 DEG C to obtain a black precipitate; washing the black precipitate with deionized water, drying in vacuum, and finally calcining for 1.5-2.5 h under the air condition that the temperature is 300-350 DEG C; and obtaining the oxygen-doped molybdenum disulfide material with defects. The oxygen-doped molybdenum disulfide material with the defects is used as an adsorbent for adsorbing methylene blue, the defects and oxygen doping havea synergistic effect, and compared with single defects and oxygen-doped molybdenum disulfide, the oxygen-doped molybdenum disulfide material with the defects has the advantages that the adsorption capacity is greatly improved, and the adsorption rate is high.

The invention specifically reveals a preparation method for a titanium oxynitride photocatalyst, which belongs to the technical field of chemical engineering of titanium dioxide photocatalysts. The method comprises the following steps: uniformly mixing TiN powder and concentrated alkali, adding an oxidizing agent and homogenizing an obtained mixture with stirring so as to obtain a mixed emulsion;transferring the mixed emulsion to a hydro-thermal kettle and allowing the mixture to maintain a temperature of 150 to 200 DEG C for 6 to 18 h so as to obtain a sample; rinsing the sample with deionized water until the sample is neutral and drying the sample so as to obtain the titanium oxynitride photocatalyst which is chrysanthemum powder. The oxidation degree of titanium oxynitride can be controlled by adjusting the concentration of alkali, hydro-thermal time, hydro-thermal temperature or the concentration of the oxidizing agent. The preparation method provided in the invention is simple. According to results of photocatalysis tests, the chrysanthemum-like titanium oxynitride prepared by the method has excellent activity of photocatalytic degradation of methylene blue and photocatalytic decomposition of water into hydrogen.

The present invention discloses a preparation method, a desorption method and applications of a carbon nano-tube/polyaniline lightweight composite adsorption material with a characteristic of easy lightweight separation. According to the preparation method, hollow glass microspheres are adopted as a carrier, a layer-by-layer self-assembly method is used to make carbon nano-tubes and the hollow glass microspheres be compounded, and then aniline is coated outside the carbon nano-tube and hollow glass microsphere complex in an in-situ polymerization manner so as to obtain the carbon nano-tube/polyaniline composite adsorbent having the closed cavity structure. According to the present invention, the carbon nano-tube/polyaniline composite adsorbent has characteristics of good dispersity, agglomeration resistance, light weight, easy separation and regeneration, and provides a good adsorption effect on heavy metal ions and organic dyes, the preparation process is low, the cost is low, and the adsorption rate of the carbon nano-tube/polyaniline composite adsorbent on the methyl blue dye with the concentration of 10-200 mg/L is 30-90%.

The invention discloses a preparation method of a bifunctional hybrid film for tumor exosome self-calibration detection. A bifunctional hybrid film, namely aptamer-BPNSs/Fc/ZIF-67/ITO, is constructedon the basis of simple self-assembly of black phosphorus nanosheets BPNSs, an aptamer and a ferrocene Fc doped cobalt-based metal organic framework ZIF-67 compound on an indium tin oxide ITO electrode. The aptamer marked by methylene blue MB is specifically combined with the CD63 protein to capture protein accurately. The protein is a specific biomolecule carried by breast cancer MCF-7 cell exosome, and realizes detection for the tumor cell exosome. MB is used as a response signal, Fc is used as a reference, and a self-calibration sensor for quantitative detection of the tumor exosome is constructed. Compared with the prior art, the exosome self-calibration detection method is convenient to operate, high in sensitivity, low in cost and high in specificity, can be used as a novel exosome self-calibration detection method, and is used for quantitative detection for exosomes in biomedical samples.