80 results about "Methyl violet" patented technology

The invention discloses a preparation method and application of a cadmium sulfide / graphite like carbon nitride (CdS / g-C3N4) composite visible light catalyst. The preparation method of the catalyst is a chemical precipitation method which is performed in an alkaline environment, wherein g-C3N4 is taken as a matrix, and CdCl2 and Na2S are taken as raw materials. The weight ratio of CdS to g-C3N4 in CdS / g-C3N4 is (1:2)-(5:1), and when the composite visible light catalyst is used for visible light catalysis treatment of methylene blue and methyl violet solutions, a better degradation effect can be obtained; and furthermore, the catalyst can still keep higher catalytic activity after being reused for five times. The composite visible light catalyst disclosed by the invention has important significance for development of the visible light catalyst, and also has good application prospects in treatment of dye wastewater.

The invention relates to a COFs (Covalent Organic Frameworks) material with high specific surface area, a preparation method and application thereof. The COFs material comprises covalent organic frameworks formed by Schiff-base condensation reaction of triformylphloroglucinol and melamine. The COFs material is controllable in pore diameter and is applicable to adsorption of dye and aromatic-hydrocarbon substances; the benzene ring structure on the COFs material and benzene rings of aromatic amine and aromatic-hydrocarbon compounds have strong Pi-Pi action; the COFs material realizes high-efficiency adsorption of methyl violet, naphthalene, anthracene and phenanthrene of cationic dyes.

The invention discloses a beta-cyclodextrin polymer and a preparation method thereof as well as a method for treating cationic dye wastewater by using the beta-cyclodextrin polymer. The preparation method of the beta-cyclodextrin polymer comprises the following steps: carrying out polymerization reaction on beta-cyclodextrin (beta-CD), a crosslinking agent (tetrafluoroterephthalonitrile TFPN) anda basic salt compound into an organic solvent in the inert atmosphere; reacting the obtained polymer with sodium hydroxide, thereby obtaining a reaction product, namely a porous beta-cyclodextrin polymer (CDP-COOH). The porous beta-cyclodextrin polymer prepared by the preparation method disclosed by the invention can be used for quickly removing cationic dye contaminants such as methylene blue, malachite green, basic fuchsin, methyl violet and alkaline blackish green in water, and the adsorption rate of the beta-cyclodextrin polymer is greater than that of an activated carbon material. Besides, the polymer can be regenerated for multiple times under mild conditions, and the adsorption performance loss is smaller.

The invention discloses s preparation method of a hydroxypropyl guar gum / nanocellulose cross-linked adsorption film. The method takes hydroxypropyl guar gum and microcrystalline cellulose as main raw materials, and comprises the steps: thinning the microcrystalline cellulose in a nano grinder and a high-strength ultrasonic wave generator successively to prepare nanocellulose, then respectively dispersing and dissolving the nanocellulose and hydroxypropyl guar gum in maleic acid, then adding maleic anhydride and sodium hypophosphite, stepwise heating to carry out esterification and cross-linking reaction, centrifuging and defoaming the reactant, shaping the reactant in a mold, forming a film by drying, and cleaning and freeze-drying the film to obtain the adsorption film. The film prepared by the method is light yellow and transparent, has good adsorptive capacity on copper ions, zinc ions, led ions, methylene blue and methyl violet, and simultaneously has higher mechanical properties.

The invention relates to zinc-aluminum binary hydrotalcite and an application thereof as a photocatalytic material used for degrading methyl violet. The hydrotalcite has a chemical general formula of [Zn<2+>1-xAl<3+>x(OH)2](CO3<2->)x / 2.mH2O], wherein x is the molar ratio of Al<3+> / [Al<3+>+Zn<2+>], x is no smaller than 0.2 and no greater than 0.33, m is the number of crystal water, and m is no smaller than 2 and no greater than 6. When dihydroxyl composite hydroxide of zinc-aluminum binary hydrotalcite provided by the invention is used for catalyzing the degradation of methyl violet in dye wastewater, the reaction condition is mild, the dye removal rate is high, and materials can easily be recycled after degradation.

The invention discloses a magnetic molecular imprinting bionic ELISA (enzyme-linked immuno sorbent assay) detecting method. The magnetic molecular imprinting bionic ELISA detecting method includes steps of preparing magnetic molecular imprinted polymer and setting up a direct-competition ELISA method. By the detecting method, uniform-particle MG-MMIPs (malachite green-magnetic molecular imprinted polymers) are prepared by an emulsion polymerization method, adsorption performance is investigated, the MG-MMIPs is used as bionic antibody, and the directly-competitive ELISA detecting method is established by means of competitive adsorption to MG antigen and enzyme labeling MG antigen. Under the optimum reaction conditions, the standard curve sensitivity is 20.14 ugL-1, and the minimum detection limit is 0.12 ugL-1 and is lower than detection limit of 2 ppb (ng / g) of a MG rapid-detection card. Meanwhile, the method has high selectivity for MG, and cross reaction rates for two structural analogues (methyl violet and brilliant green) of the MG are 7.4% and 3.9% respectively.

The invention provides a method for detecting mixing uniformity of soil heavy metal pollution samples. The method comprises steps as follows: (1), methyl violet powder is mixed with a plurality of to-be-detected soil heavy metal pollution samples; (2), the mixed powder at different sites is selected and sampled at random; (3), the mixed powder at different sites is dissolved with ethyl alcohol respectively and prepared to form solutions; (4), light absorption values of the solutions at the level of 579 nm are measured respectively; (5), CV (coefficients of variation) of distribution of methyl violet in the mixed powder at different sites are calculated. According to the detection method, the mixing uniformity of the soil heavy metal pollution samples is reflected by comparing differences of distribution of methyl violet in the mixed powder samples at different sites, mixing uniformity of heavy metal ions in soil is accurately detected, the detection accuracy of the content of heavy metals in soil is improved later, and further treatment of pollution of heavy metals in soil is facilitated.

The invention discloses a visible light catalyst BiNbO4, a preparation method thereof and application thereof. The method for preparing the catalyst comprises the following steps: mixing niobium precursor and soluble bismuth salt to form transparent solution after stirring; stirring the mixture at the temperature of between 60 and 80 DEG C, and adjusting pH value to be between 7 and 8; baking the adjusted solution in an oven at the temperature of between 80 and 250 DEG C for 3 to 10 hours to obtain yellowish-brown precursor powder; and annealing the precursor powder at the temperature of between 550 and 1,050 DEG C for 1 to 24 hours to obtain BiNbO4 powder. The BiNbO4 powder in various crystal forms capable of catalytically decomposing organic dyes under visible light is discovered for the first time; the method for synthesizing the catalyst is simple; and the synthesized BiNbO4 powder has high catalytic activity, can completely degrade methyl violet under the visible light for 1.5 hours, can be used for treating industrial waste water, degrading dye waste water and the like, and has wide application range.

The invention discloses a method for measuring the homogeneous degree of a fodder. The method comprises the following steps of: dissolving methyl violet by using ethanol with the volume percent concentration being more than 95% to prepare a methyl violet solution; mixing the prepared methyl violet solution with a tracer carrier for uniformly stirring and drying to obtain a methyl violet tracer; then adding the methyl violet tracer to the fodder for preparing a fodder sample; and measuring the homogeneous degree of the fodder sample. By utilizing the method, methyl violet solid does not need to be smashed, the method is environment-friendly, and health threat to operating workers is greatly reduced. Meanwhile, the methyl violet solid does not need to be smashed so that the method for preparing the methyl violet tracer is simple, convenient and easy to operate, investment in pulverizer equipment is also eliminated, and the production cost is reduced. Further more, a sampling device is adopted for sampling when the method is used for detecting the homogeneous degree of the samples, and the samples in different positions of a mixing machine can be sampled so that the condition of the homogeneous degree of the fodder can be truthfully reflected.

The invention provides a preparation method of an electrochemical sensor for detection of homocysteine. The preparation method comprises preparation of a conducting polymer modified electrode and preparation of a poly(methyl violet) modified conducting polymer electrochemical sensor. The conducting polymer modified electrode is put into a phosphoric acid buffer solution containing 8*10<-5> mol / L poly(methyl violet) and subjected to electrolytic deposition for five minutes under +1.6V, then the scanned conducting polymer modified electrode is taken out and washed several times with absolute ethanol and secondary distilled water sequentially, and the poly(methyl violet) modified conducting polymer electrochemical sensor is prepared. The preparation method of the sensor is simple, and the sensitivity is high.

The invention provides a sarranine and methyl violet mixed staining method for resin slices and a staining solution thereof. The method comprises the following steps: (1) preparing a staining solution, namely preparing 0.5 mass percent of sarranine solution and 1 mass percent of methyl violet solution; and (2) respectively mixing the 0.5 mass percent of sarranine solution and the 1 mass percent of methyl violet solution according to multiple volume ratios, staining resin semithin sections, and observing the microscopic structure under a light microscope. According to the method disclosed by the invention, different histological stain requirements can be met aiming at the toluidine blue-O staining defect, and the method has the advantages of low cost and simplicity in preservation.

The invention discloses a color-changing coating and a preparation system and preparation method thereof. The color-changing coating is composed of the following components in parts by weight: octyldodecanedioate phthalate, tribasic lead sulfate, polyaluminium chloride, barium carbonate, propylene glycol phenyl ether, water, a thickener and a discoloring agent according to a ratio of (10-20): (1-3): (2-5): (5-8): (7-12): (30-90): (3-5): (2-5), the thickener is composed of cyclohexane, polyvinyl alcohol, hydroxyethyl cellulose and esterified pectin liquid, and the discoloring agent is composedof methyl methacrylate, zinc phosphate, methyl violet and phenolphthalein. The method comprises the following steps: 1, respectively adding the raw material components of the thickener and the raw material components of the color-changing agent into two movable stirring pipes, and adding the rest raw material components into a stirring cavity, 2, stirring the raw materials, 3, enabling the mixtureto flow into a stirring cavity, and continuously mixing and stirring with the raw materials in the stirring cavity, and 4, completely stirring all the raw materials in a stirring cavity formed by a stirring rectangular pipe and a stirring semicircular cylinder, so that a coating is obtained, discharging the coating through a discharging pipe, and collecting it.

The invention relates to transition metal tungstate, in particular to a method for preparing a CdS / MnWO4 heterojunction compound photo-catalyst. Tungstic acid nanometer rods are dispersed into deionized water, then, thiourea and cadmium acetate are added, uniform stirring and mixing are performed to be subjected to a hydrothermal reaction, and then the CdS / MnWO4 heterojunction compound photo-catalyst is obtained, wherein the mole ratio of CdS to MnWO4 is 0.3-1.5:1. The obtained heterojunction compound photo-catalyst can effectively achieve photocatalyzing and degrading of methylene blue and methyl violet under visible light.

The invention discloses a hydrophobic low-eutectic-point solvent based on lidocaine and a preparation method and extraction application of the solvent, and belongs to the technical field of extraction, separation and enrichment of large cationic compounds. The hydrophobic low-eutectic-point solvent based on lidocaine is characterized in that the hydrophobic low-eutectic-point solvent is synthesized from lidocaine serving as a hydrogen bond acceptor and n-octyl p-hydroxybenzoate serving as a hydrogen bond donor in the molar ratio of 1:(0.25-3). The invention particularly discloses the preparation method of the hydrophobic low-eutectic-point solvent based on lidocaine and application of the solvent in extraction of rhodamine B, methyl violet or / and malachite green in an aqueous solution. When used as an extraction agent, the prepared hydrophobic low-eutectic-point solvent has the advantages of being easy to synthesize, stable in performance, low in toxicity, high in extraction efficiency and the like.

The invention belongs to the field of food detection and especially relates to acid value rapid test paper and a detection method thereof. A production method of the rapid test paper comprises the following steps: (1) preparing a soak solution: putting 0.01-2g of methyl violet, 0.02-1.5 g of methyl red and 0.02-2g of Congo red in a 1000mL beaker, adding 1000mL of absolute ethyl alcohol, and fullystirring and dissolving to obtain the soak solution; and (2) taking glass cellulose paper, cutting the glass cellulose paper into strips, soaking the strips in the soak solution for 20-30 minutes in adark place, taking out the strips, drying the strips under a vacuum condition of 45-60 DEG C, cutting the dried test strips into test paper sheets of 6*6mm, and adhering the test paper sheets to oneends of PVC strips so as to obtain the rapid test paper. The method realizes one-step detection, does not need steps of titration, calculation and the like, greatly saves detection time and is especially suitable for on-site detection.

The invention discloses a method for preparing renewable polysaccharide etherate composite gel from cornstalk cores. The method comprises the following steps of peeling, grinding and screening air-dried cornstalks so as to obtain qualified raw materials; extracting the qualified raw materials by utilization of a benzene-alcohol solution; performing delignification treatment by utilization of an acidic sodium chlorite method, then dissolving dried polysaccharide in a low-temperature sodium hydroxide (lithium hydroxide) / urea (thiourea) solution, removing bubbles through centrifugation, dropwise adding a sulfuric acid solution to adjust the mixture solution to be neutral, and centrifuging, washing and drying precipitates so as to obtain renewable polysaccharide; utilizing two etherifying agents, such as anions and cations, to respectively perform etherification reactions with the renewable polysaccharide so as to obtain anionic renewable polysaccharide etherate and cationic renewable polysaccharide etherate; finally, dissolving the two etherified products, dropwise adding an epoxy chloropropane solution to perform a cross-linking reaction, and preparing the renewable polysaccharide etherate composite gel from the cornstalk cores. The gel prepared according to the method disclosed by the invention is white and microspheric, has a higher adsorption capacity to methylene blue and methyl violet, has a biodegradability, and belongs to an environment-friendly organic dye absorbing material.

The invention discloses a method for selective flotation separation of molybdenum and rhenium acid radicals in an alkaline leaching liquid. The method comprises the following steps that a pH value ofthe alkaline leaching liquid containing molybdate acid radicals and rhenium acid radicals is adjusted to 7.1-12, then an organic matter modified activated carbon collecting agent composed of triethylenetetramine, tetraethylenepentamine, methyl violet 10B and cocamidopropyl betaine and a surface active agent are added into the alkaline leaching liquid, pneumatic flotation is carried out, a foam product is a rhenium-rich component, and a liquid core is a molybdenum-rich solution. The method has the advantages that the selective separation effect is good on molybdenum and rhenium, the technological process is simple, and the cost is low, and is especially suitable for separation between the rhenium and the molybdenum in the alkaline leaching liquid with low rhenium content and high molybdenumcontent.

The invention relates to a hydrogen peroxide plasma sterilization discoloration ink and a preparation method thereof, which belong to the technical field of medical supplies sterilization detection, and comprise a discoloration ink and a common pigment, wherein the discoloration ink comprises methyl blue 0.8-1.2g, methyl violet 6-10g, absolute alcohol 6500-7500ml, ethyl acetate 800-1200ml, triethanolamine 45-55ml, butyl acetate 800-1200ml and poly urethane (PU) resin adhesive 2.8-3.2kg, and the common pigment comprises phenosafranine 0.1-0.3g and absolute alcohol 45-55ml. The method for preparing the hydrogen peroxide plasma sterilization discoloration ink comprises steps: the methyl blue and the methyl violet are added into the absolute alcohol, are added with the ethyl acetate, the butyl acetate and the triethanolamine after being stirred and dissolved, then a dissolved solution is filtered, and is added with the PU resin adhesive to prepare a discoloration pigment, the phenosafranine is added into the absolute alcohol to prepare a common pigment by being stirred and dissolved, and the prepared common pigment is added into the discoloration pigment at last, and is uniformly stirred to prepare the hydrogen peroxide plasma sterilization discoloration ink. The hydrogen peroxide plasma sterilization discoloration ink which is prepared through the method for preparing the hydrogen peroxide plasma sterilization discoloration ink is high in sensitivity, strong in stability and thorough in color change, can rapidly detect sterilizing effect, and is short in use time and high in accuracy rate.

The invention relates to an AIDS based preparation method of three-dimensional faulting specimens for researching and teaching. The preparation method is characterized by comprising the following steps: preparing the operation environment and operation conditions; shaping a corpse specimen of an AIDS patient, and pouring a formalin solution through femoral artery intubation for anticorrosion; after pouring the formalin solution into the corpse specimen, placing for 10-12 hours, and fully soaking the corpse in a formalin solution with the weight ratio of 5% for fixing for 6 months; positioning and scribing on the corpse specimen surface in the methyl violet elastic line method; placing the corpse specimen at the environment of -30 DEG C for freezing for 7-10 days; sawing the corpse specimen through a wood serrulate band saw for traverse, coronary and sagittal faulting specimens; conducting pathologic sampling on the faulting specimens; processing and preserving the specimens. The AIDS three-dimensional faulting specimens prepared through the preparation method realize the general perfect combination of the faulting specimens, CT images and pathological corroboration.

The invention relates to an adsorption treatment method for cationic dye. The adsorption treatment method for the cationic dye comprises the following steps: firstly utilizing water to classify lignin into a water soluble fraction and a water insoluble fraction, then utilizing a ketone solvent to classify the water insoluble lignin fraction into a ketone soluble fraction and a ketone insoluble fraction again, and using the finally obtained water insoluble and ketone insoluble fraction for adsorbing and separating cationic dye methylene blue, cationic brilliant red, crystal violet, methyl violet and the like. The dissolution classification method only relates to dissolution classification of lignin and does not relate to chemical modification, so that the method provided by the invention has the advantages of simple technology and low cost; and water and the ketone solvent used for dissolution classification can be repeatedly utilized by recycling, and no consumption or loss is produced, so that the method provided by the invention has the advantage of being environment-friendly.

The invention discloses a medical carbon dioxide adsorbent and a preparation method thereof. The adsorbent comprises raw materials as follows: soda lime, LiOH, a humectant, deionized water, methyl violet and a disintegrating agent. The preparation method comprises preparation steps as follows: 1), soda lime is prepared; 2), soda lime powder, LiOH, the humectant and the deionized water are mixed, and a cylindrical bar with the diameter of 1-2 mm is extruded through an extrusion machine; 3), the cylindrical bar is dried and ground, and a finished product is obtained. The adsorbent has high adsorption capability and is low in cost, and powder is not easily produced.

The invention relates to the technical field of photocatalysis, and concretely relates to a photocatalytic degradation composite particle, and a preparation method and an application thereof. The photocatalytic degradation composite particle comprises nano-scale anatase titanium dioxide, silicon dioxide particles, triclinic FeVO4 crystal particles and a coupling agent. Rice straws can be used forproducing the silicon dioxide particles, the triclinic FeVO4 crystal particles are produced by utilizing corn corns, and the triclinic FeVO4 crystal particles, silicon dioxide particles and nanoscaleanatase titanium dioxide are mixed by utilizing the coupling agent. In a laboratory environment, methyl violet can be completely degraded within 150 min, the degradation capacity of the composite particle on wastewater is high, the use amount of titanium dioxide is greatly reduced, the production cost is reduced, waste is treated with waste, and a new application is provided for the rice straws and corn corns.

The invention provides an anhydride modified passion fruit peel bio-adsorbent and a preparation method and application thereof, and belongs to the technical field of environmental functional materialsand water pollution control. According to the invention, the passion fruit peel is used as a raw material and contains a large amount of cellulose, hemicellulose, lignin and different functional groups such as hydroxyl, carboxyl and the like, so that the passion fruit peel has very strong adsorption performance on dye molecules in water. Through anhydride modification, more carboxyl groups are introduced, so that the adsorption performance of the adsorbent on cationic dyes and heavy metal ions can be improved. The succinic anhydride modified passion fruit peel bio-adsorbent prepared by the preparation method has a very good adsorption effect on methyl violet and methylene blue, high adsorption capacity and strong reproducibility, and the prepared maleic anhydride modified passion fruit peel bio-adsorbent has a good adsorption effect on various heavy metals, wherein the adsorbent has a very good adsorption effect on Pb < 2 + > and Cd < 2 + >, relatively high adsorption capacity and relatively short adsorption equilibrium time.

The invention discloses a biosensor for simultaneously detecting AFP (Alpha Fetoprotein) and miRNA-122 through resonance light scattering and a preparation method of the biosensor. The biosensor is composed of hybridized double chains cDNA1 and cDNA2 and methyl violet (MV), wherein the methyl violet is embedded into the hybridized double chains; cDNA1 comprises an AFP aptamer fragment; and cDNA2 comprises a miRNA-122 aptamer fragment. Under mutual actions of electrons of methyl violet (MV) and dsDNA, amplified resonance light scattering signals can be generated, a double-function label-free probe sensor has detection limits of 0.94mu g and 98mP upon AFP and miRNA-122 respectively, a relatively efficient, rapid and low tumor marker detection technique is established, and the technique has potential application in clinical screening of early-stage liver cancer.

The invention discloses on-site metallographic coated test paper and a preparation method and a use method thereof, and belongs to the field of metal on-site detection. Acetone is not needed in the manufacturing and using process of the test paper, a solution for preparing the test paper is composed of ethyl cellulose, methyl violet and absolute ethyl alcohol, and only absolute ethyl alcohol is needed in the laminating metallographic process. Compared with the conventional metallographic coated test paper AC paper, the metallographic coated test paper prepared by the invention has the advantages of short preparation time, low cost and higher safety.

The invention discloses a methylene violet derivative fluorescent probe as well as a synthesis method and application thereof. The fluorescent probe is connected with an NBD group through piperazine on the basis of a cationic main structure of methylene violet. The preparation method comprises the following steps: directly reacting methylene violet 3RAX with piperazine, or firstly reacting with X-R5-X and then reacting with piperazine, and finally introducing an NBD group to a piperazine group to obtain the target fluorescent probe; or reacting 4-fluoronitrobenzene, piperazine and aniline to obtain a cationic main structure of methylene violet, and finally introducing an NBD group to a piperazine group to obtain the target fluorescent probe. The fluorescent probe is good in water solubility, can be used for sulfur ion detection, is high in detection sensitivity and low in detection limit, and can also be used as a tumor photodynamic therapy probe to quickly release singlet oxygen for tumor photodynamic therapy; synthesis is simple, conditions are mild, and cost is low.

A biologic testing strip is composed of a basic strip, a working electrode and a counter electrode. On said working electrode there is the envelope substance prepared from cyclodextrin, bioactive enzyme, and electron transferring medium chosen from quinone, methyl blue, methyl violet, and ferrocene or its derivatives. Its advantages are low cost, and high exchangeability and anti-interference power.

The invention discloses an on-site metallographic replica method. The on-site metallographic replica method comprises the following steps that (1) acetone, methyl violet, cellulose acetate and triphenyl phosphate are weighed, and then the acetone, the methyl violet, the cellulose acetate and the triphenyl phosphate are stirred and mixed to obtain a mixed solution, wherein the ratio of the acetoneto the methyl violet to the cellulose acetate to the triphenyl phosphate is 500mL:(0.5-2g):(10-40g):(5-15g); (2) grinding, polishing and etching are performed on an area to be inspected; and (3) the mixed solution obtained in the step (1) is applied to the area to be inspected, drying and film forming are performed, then a film is removed, then the film is bonded to a glass slide, wherein the surface, being in contact with the area to be inspected, on the film faces upward, and finally the film is observed by placing under a metallographic microscope to complete the on-site metallographic replica. The on-site metallographic replica method can avoid the use of AC paper and has a lower liquid using amount.

The invention discloses a method for treating methyl violet dye wastewater, and relates to the technical field of dye sewage treatment. The method particularly includes heating coke in water bath at the temperature of 60-80 DEG C for 60-80 min, drying the coke and then grinding the coke until the size of the coke reaches 100-140 meshes; adjusting the pH (potential of hydrogen) of the methyl violetdye wastewater until the pH of the methyl violet dye wastewater reaches 5.5-6.5; adding an adsorbent into the methyl violet dye wastewater with the adjusted pH, then oscillating the methyl violet dyewastewater for 30-40 min and then allowing the methyl violet dye wastewater to stand still for 70-100 min. The concentration of the methyl violet dye wastewater is 2-4 mg / L. The method has the advantages that micro-activation treatment is carried out on the coke in mild water bath modes at the normal temperature under the normal pressure, and accordingly the method is simple and feasible and is low in cost; the treated coke is used as the adsorbent, accordingly, methyl violet in water can be effectively removed, the concentration of the methyl violet in wastewater treated by the aid of the method is lower than 1 micro-g / L, and the methyl violet cannot be detected by visible ultraviolet spectrophotometers; the method has an excellent application prospect for treating dye wastewater.