124 results about "Rhodamine B" patented technology

A system for the synthesis of a cost-effective photocatalyst based on the FeOOH / CuBi2O4 heterostructure, consisting of: a) a CuBi2O4 synthesis plant for the production of CuBi2O4 (CBO) microspheres from Bi(NO3)3·6H2O and Cu(NO3)2.3H2O precursors; b) a heterostructure formation unit is configured to deposit FeOOH nanoparticles onto an outer surface of the CBO microspheres to form an FeOOH / CBO heterostructure; and c) a processing unit configured to wash and dry the FeOOH / CBO heterostructure to obtain the photocatalyst.

The invention discloses a polyacid-based metal viologen framework crystalline material as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalytic materials. The crystalline material is synthesized in one step through a hydrothermal method, the molecular formula is Cu2 (H2O) 2 (L) 2 [PW12O40] [OH]. 2H2O, the crystalline material belongs to a monoclinic system, the space group is P21, the cell parameters are alpha = 90 degrees, beta = 114.208 (2) degrees and gamma = 90 degrees, and the structure of the crystalline material is determined through X-ray diffraction. According to the material, accurate compounding of polyacid clusters and metal viologen on the molecular level is achieved, an effective electron transmission channel is constructed, separation of photon-generated carriers is remarkably promoted, and excellent photocatalytic activity is shown. At the ambient temperature, the crystalline material can be used as a catalyst to efficiently degrade dye pollutants (such as methylene blue and rhodamine B) in a water body, the degradation rate within 60 minutes exceeds 90%, and the crystalline material has good cycle stability and structural durability.

The invention discloses a mixed valence copper doped bismuth vanadate nanodisk photocatalyst and a preparation method and application thereof, a main body of the catalyst is a bismuth vanadate nanodisk, copper is doped in the bismuth vanadate nanodisk, and the copper is composed of Cu < + > and Cu < 2 + >; the catalyst has the characteristics of high stability, simplicity in implementation, high universality and the like. The doped copper ions not only can improve the light absorption capacity of the bismuth vanadate material, but also can promote the rapid separation of photo-induced electrons and holes of the bismuth vanadate material by virtue of the mixed valence state of the copper ions, and improve the carrier dynamics on the material, so that the photocatalytic efficiency of the bismuth vanadate material is improved. The bismuth vanadate photocatalyst doped with the copper ions in the mixed valence state has an efficient photocatalytic degradation effect on pollutants such as rhodamine B and the like, and has a wide application prospect in the technical aspects of environmental pollutant degradation and green advanced oxidation.

According to the method, melamine and urea are used as carbon and nitrogen sources, hollow tubular phosphorus-doped carbon nitride is constructed by adopting a sodium polyphosphate-assisted hydrothermal-thermal polymerization method, molybdenum disulfide is loaded on the surface of P-TCN in a hydrothermal in-situ growth mode, and the hollow tubular phosphorus-doped heterojunction photocatalyst is obtained. The hollow tubular phosphorus-doped heterojunction photocatalyst P-TCN / MoS2 is prepared; the catalyst disclosed by the invention shows excellent degradation performance on ciprofloxacin, levofloxacin, rhodamine B and methylene blue under an illumination condition. The catalyst disclosed by the invention is simple in preparation method, low in cost and easily available in raw materials, and has a wide application prospect in the field of photocatalytic treatment of antibiotic and dye wastewater.

The invention discloses a preparation method and application of a bimetallic nano-enzyme induced MOFs (at) CDs material, and the preparation method at least comprises the following steps: I, dissolving FeCl3, CoCl2 and 2-aminoterephthalic acid in N, N '-dimethylformamide to form a mixed solution I, and carrying out a reaction I to obtain a bimetallic MOFs material; step II, mixing tricarballylic acid and m-phenylenediamine, and carrying out a reaction II to obtain carbon dot powder; step III, dissolving the carbon dot powder obtained in the step II in methanol, and adding rhodamine B dye to obtain a CDs material; and IV, dissolving the bimetallic MOFs material obtained in the step I and the CDs material obtained in the step III in water, stirring, and drying to obtain the MOFs (at) CDs material. The synthesized nano-enzyme is simple to prepare and high in catalytic activity, the carbon dot material is encapsulated into the MOFs material, the fluorescence characteristic of the MOFs material is enhanced, and the carbon dot material is combined with o-phenylenediamine to be used for detecting H2O2.

The invention discloses a preparation method of a BiOBr / LaNiO3 nanofiber composite photocatalyst, which is characterized in that a perovskite material LaNiO3 prepared by electrostatic spinning is used as a carrier, and BiOBr is loaded on the fiber surface by a solvothermal method to form a heterojunction structure. According to the composite material, separation of photon-generated carriers is promoted through heterojunction of BiOBr and LaNiO3 nanofibers, and the catalytic activity under visible light is remarkably improved. The invention further discloses application of the prepared BiOBr / LaNiO3 nanofiber composite photocatalyst in degradation of rhodamine B. The degradation efficiency of the BiOBr / LaNiO3 nanofiber composite photocatalyst on rhodamine B can reach 93% within 90 min, and after four times of circulation, the composite material shows good circulation stability. The method has the advantages of being low in cost, high in stability, environmentally friendly and the like, and a green solution is provided for organic dye pollution control.

The invention provides a preparation method and application of a non-noble metal carbon felt composite electrode applied to high-salinity wastewater, a nickel-iron bimetallic active component is loaded on a carbon felt substrate through a one-step hydrothermal method, and then the nickel-iron bimetallic active component is treated with sodium hydroxide for 1 h to prepare the electrode. And when being applied to degradation of rhodamine B-containing wastewater under strong alkali and high salt conditions, the rhodamine B-containing wastewater degradation catalyst shows good catalytic performance, stability and salt resistance. According to the electrochemical composite electrode material provided by the invention, the carbon felt is used as an electrode substrate, and the carbon felt is combined with the non-noble metal nickel-iron bimetallic active component loaded on the carbon felt, so that the cost is relatively low, and the electrochemical composite electrode material is green and efficient. And the loading of bimetallic components on the substrate can be completed by a one-step hydrothermal method, the operation process is convenient, the three-dimensional porous structure of the carbon felt substrate provides a rich specific surface area, and the catalytic performance and the stability are effectively improved by loading a large amount of nickel-iron bimetallic active sites inside and outside the substrate.

This invention discloses a GSH-functionalized carbon dots / rhodamine B ratiometric fluorescence system, its construction method, and its application in nitrite detection. GSH-CDs are synthesized via a one-step hydrothermal method by mixing citric acid, o-phenylenediamine, glutathione, and hydrochloric acid in water. Unreacted precursors and small molecules are removed by purification, and the GSH-CDs are obtained by freeze-drying. The ratiometric fluorescence system is constructed by mixing rhodamine B, GSH-CDs, and an acidic buffer solution. The fluorescence intensity ratio F of GSH-CDs to rhodamine B is established. 460 / F 590 With nitrite (NO2) ‑ A calibration curve between concentrations was obtained, and the NO2 in the actual sample was experimentally detected using the spiked recovery method. ‑ Content. Under acidic conditions, with NO2... ‑ With increasing concentration, the GSH-CDs / RhB fluorescence intensity ratio (I 460 / I 590 Significant changes occurred, with the fluorescence intensity ratio compared to NO2. ‑ There is a good linear relationship between concentrations. Compared with the detection platform based on GSH-CDs, the ratio fluorescence system provided by this invention has a lower detection limit and significantly higher sensitivity.

The invention discloses a conductive hydrogel preparation method based on a photocuring 3D printing technology. The photocurable conductive hydrogel is prepared by preparing conductive hydrogel printing ink and utilizing a photocuring 3D printing technology. The preparation method comprises the steps that conductive hydrogel is prepared through two steps of conductive hydrogel printing ink preparation and photocuring 3D printing, the printing ink is prepared from acrylamide, deionized water, glycerol, poly (ethylene glycol) diacrylate, a photoinitiator 819, rhodamine B, magnesium chloride and sodium chloride, the material cost is low, and the preparation process is simple; the printing ink is prepared into the conductive hydrogel in a photocuring 3D printing mode. And a resistance signal detection circuit is used for detecting a resistance signal. The prepared conductive hydrogel can be applied to the fields of wearable equipment, robots and the like.

The application belongs to the technical field of ion detection, and particularly relates to a preparation method of a rapid detection uranyl ion ratio type fluorescent probe, comprising the following steps: dissolving rhodamine B and phosphorus oxychloride in 1,2-dichloroethane to obtain product 1; dissolving the product 1 in acetonitrile, adding 2-aminobenzimidazole and triethylamine, and stirring under heating; after the reaction is completed, column chromatography purification is carried out, and vacuum drying is carried out to obtain the target product fluorescent probe RBN; and the fluorescent probe RBN is dissolved in DMSO to prepare a mother liquor. The fluorescent probe has the advantages of rapid response to uranyl ions, simple synthesis route, simple detection equipment and method, and the like, and can be used for qualitative and quantitative detection of uranyl ions in an environment and a biological system.

The invention discloses a baijiu detection method based on a colorimetric and fluorescent dual-signal sensing array, and relates to the technical field of substance detection and analysis. According to the detection method, the principle that rhodamine B and rhodamine 6G have remarkable ultraviolet-visible spectrums and fluorescence characteristic peaks, and rhodamine B and rhodamine 6G can be accelerated to be catalytically degraded by MnONSs under the acidic condition is utilized, so that optical signals (colorimetric-fluorescence double signals) of rhodamine B and rhodamine 6G can be adjusted by adjusting the catalytic action of MnONSs; according to the method, a colorimetric and fluorescent dual-signal sensing array is constructed, then the dual-signal sensing array is utilized to form characteristic fingerprints of various Baijiu samples, rapid and accurate detection of Baijiu is achieved, and the method is few in types of detection materials, simple and convenient to operate and more suitable for large-scale popularization and application.

The application discloses a kind of stable crystal form photocatalyst and its preparation method, application, belong to photocatalyst technical field, the catalyst is 1-ethyl-3-methyl imidazole tetrafluoroborate ion liquid assisted La doped TiO2 Photocatalyst, La doping ratio 0.12-0.13%, ion liquid content 12-13 mL / mg.It is prepared using sol-gel method, by precisely controlling A, B liquid ratio and 595-605 DEG C, 1.8-2.2h calcination process, realize lattice defect controllable and crystal form stable.When applied, the mass ratio of catalyst and rhodamine B is 99-101:1, and rhodamine B in wastewater can be efficiently degraded under illumination for ≥80 min, with a degradation rate of ≥92%.The degradation rate is still ≥88% after being reused for 5 times.The catalyst has stable crystal form, high photocatalytic efficiency, environmental protection and economy, and is suitable for treating wastewater containing rhodamine B in multiple industries.

The invention provides a Motixazotide-nitrogen mustard conjugate and a preparation method and application of a fluorescent probe of the Motixazotide-nitrogen mustard conjugate, and belongs to the field of polypeptide preparation and biological medicine. According to the present invention, a solid phase polypeptide synthesis method is adopted to covalently link a DNA alkylation reagent nitrogen mustard and a CXCR4 targeting peptide Motixazotide, and further couple with a fluorescent dye so as to successfully prepare a series of novel conjugates and fluorescent probes thereof; experiments prove that the Motixazotide-nitrogen mustard conjugate and the fluorescent probe thereof prepared by the invention can be used for remarkably improving the anti-tumor activity of nitrogen mustard and the targeting property of the nitrogen mustard to tumor cells. Meanwhile, the rhodamine B labeled dinitrogen mustard conjugate BCCR has a specific targeting effect on a CXCR4 receptor and a dual targeting effect on a tumor cell nucleus. The conjugate realizes real-time tracing of the whole process of tumor targeting, cell delivery and nuclear localization, and provides a powerful tool for curative effect evaluation and mechanism research, so that the conjugate has good clinical transformation prospect and application value.

The application discloses a CuS / Cu3(MoO4)2(OH)2 composite and a preparation method and application thereof. The CuS / Cu3(MoO4)2(OH)2 composite material is prepared by using CuCl2, Na2MoO4 and Na2S as raw materials and adopting a hydrothermal method. The CuS / Cu3(MoO4)2(OH)2 composite acoustic catalyst provided by the application can be used for ultrasonic catalytic degradation of organic pollutants in cooperation with H2O2. When the ultrasonic power is 500 W and the ultrasonic time is 30 min, the degradation rates of acid orange 7, tetracycline, rhodamine B, congo red, methylene blue and basic red 2 in water can reach 89.6(±5.78)%, 92.91(±0.36)%, 96.93(±0.16)%, 97.73(±0.61)%, 98.53(±0.37)% and 99.87(±0.18)%, respectively.

The application provides a spherical lignin-phenolic resin and a preparation method and application thereof in adsorbing N-containing organic dyes, and belongs to the technical field of adsorbing materials. The lignin-phenolic resin with regular spherical morphology is prepared by one-step condensation polymerization reaction through the reverse suspension polymerization method under acid catalysis, wherein lignin, hydroquinone and trioxane are used as raw materials. The lignin belongs to renewable resources, has the characteristics of low cost and environmental friendliness, can replace phenol as the main phenol source, and the replacement rate can reach 75%. The yield of the synthesized phenolic resin is as high as 60-80%. In addition, the monomer type can be selected to introduce rich phenolic hydroxyl groups, sulfonic acid groups and other oxygen-containing groups in the resin, the monomer ratio is controlled to change the crosslinking structure of the resin, the adsorption capacity of the resin for N-containing organic dyes is effectively improved, and efficient adsorption of rhodamine B and methylene blue can be realized.

The invention discloses a fluorescent probe for recognizing lithium ions and a preparation method and application thereof.The method comprises the steps that rhodamine B, HATU and methyl 3-amino-3-methyl-1-butyrate are mixed and subjected to a first-step reaction, a first reactant is obtained, the first reactant, ethyl alcohol and sodium hydroxide are mixed and subjected to a second-step reaction, a second reactant is obtained and subjected to a third-step reaction, and the fluorescent probe for recognizing the lithium ions is obtained. And mixing the second reactant, crown ether, EDCI and HOBT, and carrying out a third-step reaction to obtain the fluorescent probe. According to the method, lithium ions in a complex environment can be efficiently recognized, and raw material waste and resource loss in the production process are avoided.

This invention discloses a method for preparing an h-BN / Fe-ZnO / g-C3N4 composite photocatalyst. The preparation method includes the following steps: first, mixing an iron source and zinc acetate dihydrate, titrating with an alkaline solution, filtering, washing, vacuum drying, and grinding to obtain a Fe-ZnO precursor; then mixing the Fe-ZnO precursor with urea, h-BN, and ascorbic acid in a covered alumina crucible and calcining in a muffle furnace to obtain a solid material; finally, grinding the solid material to obtain the h-BN / Fe-ZnO / g-C3N4 composite photocatalyst. The h-BN / Fe-ZnO / g-C3N4 composite photocatalyst prepared by this invention can effectively separate electron-hole pairs, reduce the electron-hole recombination rate, and thus effectively improve photocatalytic activity. This material exhibits excellent degradation performance for Rhodamine B water pollutants. Using 40 mg h-BN / Fe-ZnO / g-C3N4 composite photocatalyst under a 300W xenon lamp with a wavelength λ≥420 nm to simulate visible light, 100 mL of Rhodamine B with a concentration of 20 mg / L was degraded. After 90 minutes, the degradation efficiency reached 98.4%, and after five cycles, the degradation rate still reached 80.1%, demonstrating good reusability.

The application relates to preparation and application of a dye-functionalized rare earth metal organic framework material capable of recognizing sulfur ions: S1, selecting raw materials, terbium nitrate, pyrazine tetramethanic acid, potassium hydroxide and rhodamine B; S2, dissolving the pyrazine tetramethanic acid in distilled water and stirring; S3, adding the Tb(NO3)3.6H2O methanol solution obtained in S2 into the solution, and stirring; S4, adding the KOH solution into the solution obtained in S3, and stirring; S5, standing, centrifugally collecting the white precipitate, and drying after washing to obtain the white rare earth metal organic framework material; S6, immersing the sample in different concentrations of rhodamine B dyes for treatment; S7, collecting the purple red precipitate in S6, and drying to obtain the dye-functionalized rare earth metal organic framework material; and S8, using the obtained dye-functionalized rare earth metal organic framework material for sulfur ion detection. The preparation of the dye-coated rare earth metal organic framework is that the rare earth metal organic framework is coated with different concentrations of rhodamine B dyes, can be used as a ratio type fluorescent probe, and can more sensitively and accurately recognize and detect sulfur ions.

To provide a structure for manufacturing a container in which different components are attached together with an adhesive, thereby improving the efficiency of observing biologically derived substances. [Solution] The structure comprises a base material having a plurality of through holes opening in the vertical direction, and an adhesive layer provided on the lower surface of the base material, to which a sheet that closes the through holes is attached. The adhesive layer is formed by attaching a test piece cut to a size of 10 mm × 10 mm, with an opening diameter of 16.2 mm, a well depth of 18 mm, and a well volume of 3.5 mL, to the bottom surface of a tissue culture polystyrene well having an opening below the through holes, with an outer shape in plan view larger than the outer shape of the through holes, and filling the well with 0.5 mL of a phosphate-buffered saline solution with a concentration of 5 μM rhodamine B, and letting it stand at 23°C for 48 hours, and the adhesive is formed by an adhesive such that the remaining percentage of rhodamine B in the solution is 20% or more. The adhesive is an acrylic or silicone-based adhesive.

The invention relates to the technical field of photocatalytic materials, and particularly discloses an efficient FRET-ISC synergistic composite photosensitive nano material based on aggregation-induced emission (AIE) matrix coating, a preparation method of the nano material and application of the nano material in photocatalytic degradation of organic pollutants. The material comprises an AIE characteristic matrix (such as tetraphenylethylene), an energy donor dye (such as coumarin 6) dispersed in the matrix and an energy acceptor dye (such as iodo-boron dipyrromethene) with a heavy atom effect, a donor emission spectrum and an acceptor absorption spectrum are overlapped, so that the synergistic effect of fluorescence resonance energy transfer and intersystem crossing (FRET-ISC) is realized, and the fluorescence intensity of the material is improved. The generation efficiency of singlet oxygen (1O2) is obviously improved. The material is prepared by adopting a microfluidic anti-solvent precipitation method, water-phase dispersed nano-particles (the particle size is 100-400 nm) are formed, the singlet oxygen quantum yield of the material reaches 0.75, the degradation rate constant (0.025 min <-1 >) of the material to rhodamine B is 4.3 times that of a single IBDP system, the degradation rate in 2 hours exceeds 90%, and the activity is kept above 80% after the material is recycled for 5 times. The invention solves the problems of aggregation quenching (ACQ) and narrow spectrum utilization of the traditional photosensitizer, has high stability, wide spectrum response and efficient catalytic ability, and is suitable for degrading organic pollutants (such as RhB, methylene blue and tetracycline) in a water phase.

The application discloses a preparation method and application of a cellulose-based material loaded cobalt-doped metal organic framework compound catalyst. The composite catalyst takes a cellulose-based material as a carrier, and is subjected to hydrothermal treatment together with an aqueous solution of ferric chloride hexahydrate and fumaric acid, so as to obtain a metal organic framework compound MIL-88A which is in-situ grown on the cellulose-based material, and then the MIL-88A is subjected to freeze drying. After the treatment, the obtained cellulose-based material loaded MIL-88A is added into a mixed aqueous solution of cobalt nitrate nonahydrate and urea, and is subjected to water bath treatment at 90 DEG C, and then the cellulose-based material loaded MIL-88A obtained after the treatment is subjected to freeze drying, so as to obtain the cellulose-based material loaded cobalt-doped MIL-88A catalyst. The prepared heterogeneous catalyst can efficiently degrade dyes by activating potassium monopersulfate. The catalyst is easy to recover, and can be used in an intermittent or continuous dye degradation process. In the continuous degradation of a dye rhodamine B, when the flow rate is 6 ml / h, the catalyst can still maintain high catalytic degradation activity for 72 h.

The invention discloses a preparation method of a water-resistant biomass-based long-afterglow phosphorescent material as well as a product and application of the water-resistant biomass-based long-afterglow phosphorescent material, and belongs to the technical field of functional materials. The preparation method comprises the following steps: taking lignin (soluble components subjected to ethanol grading treatment) and urea as raw materials, dissolving the raw materials in deionized water according to a specific proportion, adjusting the pH value to be alkaline, and carrying out microwave heating to obtain the product. Rhodamine B is added to prepare the red afterglow material. The product shows blue, green and red afterglow under excitation of different ultraviolet lights, and has long afterglow life and excellent water resistance through a hydrogen bond network and a chemical crosslinking structure formed by cyanuric acid. The material is simple and convenient to prepare, low in cost and sustainable, can be applied to the fields of anti-counterfeiting identification, information encryption storage and the like, and can also be compounded with guar gum to be used for 3D printing functional components.

The present application relates to the technical field of water pollution, and more particularly to a method for degrading RhB by synthesizing P-doped tubular carbon nitride to drive photocatalytic activation of PMS. The steps are as follows: S1: preparing P-doped tubular carbon nitride; S2: applying the P-doped tubular carbon nitride obtained in step S1 to photocatalytic activation of PMS; and S3: using the photocatalytic activation of PMS to degrade RhB. The method for degrading RhB by synthesizing P-doped tubular carbon nitride to drive photocatalytic activation of PMS provided by the present application uses phosphoric acid and melamine as raw materials, and prepares P-doped carbon nitride (5P-TCN) with a tubular structure by a method of precursor self-assembly, and evaluates the PMS-photocatalytic effect of the 5P-TCN on a typical organic pollutant, Rhodamine B (RhB), under the action of visible light through batch experiments.

This invention belongs to the field of nanofiltration membrane technology, and particularly relates to a polyamide nanofiltration membrane, its preparation method, and its application. The polyamide nanofiltration membrane provided by this invention includes an ultrafiltration membrane and a polyamide selective layer attached to the ultrafiltration membrane. The polyamide selective layer is formed by a polycondensation reaction of a fully amino columnar aromatic hydrocarbon [5] and 1,3,5-benzenetricarboxyl chloride. The polyamide nanofiltration membrane of this invention can separate organic micropollutants such as Congo red, Rhodamine B, methylene blue, and methyl orange dyes, with a rejection rate of more than 95%. It also has good separation performance for some inorganic salts, with a rejection rate of more than 50%. The polyamide nanofiltration membrane of this invention can adapt to some harsh acid and alkali environments while maintaining excellent rejection performance. The polyamide nanofiltration membrane provided by this invention also has excellent antifouling performance.

The invention discloses a green hydro-thermal synthesis method of a functionalized silver nano-material, and the preparation method comprises a preparation method of a functionalized silver nano-colloid prepared from a sorbus pohuashanensis fruit extract and a preparation method of functionalized nano-silver solid powder. The invention discloses the green hydro-thermal synthesis method of the functionalized silver nano-material. The spherical nano-silver can stably suspend in a colloidal solution, and the material has the bacteriostatic effect (escherichia coli, staphylococcus aureus and candida albicans) and the effect of rapidly removing methylene blue and rhodamine B dye in water. The nano-silver material is spherical, the particle size of the nano-silver material ranges from 14 nm to 70 nm, and the average particle size of the nano-silver material is 36 nm. The sorbus pohuashanensis fruit extract attached and modified in the nano material accounts for nearly 7.0% of the total mass of the nano material. The green hydrothermal synthesis method is high in safety coefficient, convenient and rapid in operation process, small in pollution or free of pollution and high in repeatability, and the method has application and development potential.

The application discloses a preparation method of full-color laser carbon dots based on rhodamine B derivation, which comprises the following steps: ultrasonic dispersion of rhodamine B in a liquid solvent, continuous heating in an autoclave, and preparation of green, yellow, red and near-infrared light carbon dots after filtration, elution, purification and freeze-drying; when rhodamine B is mixed with NaOH or KOH solid, heating is carried out in a beaker to prepare blue light carbon dots; in the application, rhodamine B is used as a precursor, and the carbon dots are synthesized by a solvothermal method; the excellent gain performance of rhodamine B is expanded from orange and red to the whole visible light and near-infrared light region; even the emission effect can be enhanced through cross-linking; the gain performance of the carbon dots is higher than that of rhodamine B, and the carbon dots have higher fluorescence quantum yield, higher radiation transition rate, lower laser threshold and more excellent laser stability.

The invention relates to a stomach adhesion type double-network hydrogel sensor capable of realizing long-time gastric acid imaging and application of the stomach adhesion type double-network hydrogel sensor. The RHO-PDI probe takes perylene bisimide as a framework and rhodamine B as an acid response unit, pKa is approximately equal to 1.97, and 500-650 nm fluorescence is emitted in gastric acid. The double-network hydrogel is formed by crosslinking sodium polyalginate-calcium ions and polyethylene glycol dithiol-four-arm maleimide, has excellent mechanical strength and gastric wall adhesiveness, and realizes long-term, stable and non-invasive dynamic monitoring of gastric acid and circadian rhythm hormone change tracking.

The invention belongs to the technical field of degradation of rhodamine B by a cobalt-based catalyst, and particularly relates to experimental equipment and a method for degrading rhodamine B by a biomass charcoal modified cobalt-based catalyst. The experimental equipment comprises a catalyst preparation mechanism; the catalyst preparation mechanism is placed at the left end of the table top, and the catalyst preparation mechanism is used for preparing cobalt-based catalysts with different lignin addition amounts; the catalyst preparation mechanism is arranged at the right end of the table top, the solution preparation and adsorption mechanism is arranged at the right end of the catalyst preparation mechanism, the solution preparation and adsorption mechanism is placed at the right end of the table top, and the solution preparation and adsorption mechanism is used for preparing an RhB solution and a PMS solution. The experiment can be more coherent, and multiple complex procedures of the experiment are reduced, so that the experiment speed is increased, and meanwhile, experiment substances can be displayed more clearly.

The invention discloses a preparation method and application of a lanthanum-doped bismuth oxyiodide chloride / zinc oxide composite photocatalyst, and relates to a preparation method and application of a photocatalyst. The invention aims to solve the problem of low photocatalytic efficiency of zinc oxide. The method comprises the following steps: 1, preparing six-prismatic-table-shaped zinc oxide; and 2, microwave-assisted hydrothermal synthesis. The lanthanum-doped bismuth oxyiodide / zinc oxide composite photocatalyst prepared by the invention keeps a good hexagonal pyramid frustum structure, and compared with direct photolysis and monomer photocatalysis, the composite photocatalyst not only has a better light degradation effect on an organic pollutant rhodamine B under simulated sunlight, but also shows degradation efficiency as high as 98.2% after simulated sunlight irradiation for 120 minutes; moreover, the photocatalyst still has better photocatalytic ability in different water bodies, and can efficiently degrade RhB in actual sewage; after four times of circulation, the photocatalytic activity is still kept stable, and the excellent photocatalytic activity of the prepared catalyst is fully reflected.

The application discloses a fluorescent dye tracer method for tracking hydraulic fracturing cracks and application, and the method comprises the following steps: S1, configuring a fluorescent dye solution: using a water-soluble fluorescent dye rhodamine B to prepare a mass-volume ratio aqueous solution with a concentration of 0.01% to 0.05%; S2, pre-treating and cleaning the cracks of a sample: using a hydrochloric acid solution with a concentration of 1% to 3% to acid-wash the cracks of the sample, and then rinsing the sample with clean water; S3, pre-saturating the crack channel: pre-saturating the crack network of the sample; S4, injecting the fluorescent dye solution under low pressure pulse, so that the crack channel is filled with the fluorescent dye solution; S5, soaking and permeating: after the crack channel is filled with the fluorescent dye solution, stopping the injection and placing the sample, and soaking the sample to make the fluorescent dye solution penetrate into fine cracks and pores; S6, observing the dyeing: after the surface of the sample is dried, cutting the sample along the main crack direction to observe the internal crack direction, and performing quantitative analysis by using image processing software.