38 results about "Methyl orange" patented technology

The invention discloses an indium-based metal-organic framework material based on a pyridine hexacarboxylic acid ligand as well as a preparation method and application of the indium-based metal-organic framework material, the chemical formula is {[NH2Me2] 2 [In4 (mu2-O) (H6L) 2 (H2O) 2]. 3DMF. 10H2O} n, and H6L is an organic ligand 4, 4 ', 4' '-(pyridine-2, 4, 6-triyl) triisophthalic acid. The material has excellent thermal stability and chemical stability, and due to the frame charge characteristic and the excellent pore structure of the material, the metal organic frame material shows efficient dye selective adsorption and separation performance, can selectively adsorb cationic dye methylene blue MB and repel anionic dye methyl orange MO at the same time. In conclusion, a new design thought is developed for the novel indium-based metal organic framework material based on the pyridine hexacarboxylic acid ligand, and meanwhile, a new candidate is provided for developing a high-efficiency dye wastewater purification material.

The application relates to the technical field of chemical composite materials, and discloses a manganese dioxide-iron oxide composite material for removing arsenic from acidic wastewater and a preparation method, wherein manganese dioxide nanotubes are first synthesized, then the manganese dioxide nanotubes are added into a solution containing iron salt and methyl orange, the black turbid solution is dried in an oven after stirring, and finally the obtained powder is heated and calcined to obtain the manganese dioxide-iron oxide composite material. The composite material can effectively adsorb arsenic in weakly acidic wastewater, and solves the problems of poor arsenic removal effect and poor material stability of single manganese dioxide and single iron oxide. Meanwhile, the composite material has low preparation cost, the preparation method is simple, special equipment is not needed, and a new method for removing arsenic from weakly acidic wastewater is provided.

This invention belongs to the field of lithium battery material technology, specifically relating to a metal oxide / mesoporous manganese dioxide / conductive polymer composite material, its preparation method, and its application. The preparation method includes the following steps: 1) ball milling a commercial metal oxide; 2) mixing the metal oxide powder with an organic polymer monomer and a methyl orange solution and ultrasonically dispersing the mixture to obtain a liquid mixture; 3) adding a potassium permanganate solution to the liquid mixture and performing a high-pressure hydrothermal reaction under stirring to obtain the composite material; 4) subjecting the composite material to alkali treatment, filtering, washing with water, and drying to obtain the metal oxide / mesoporous manganese dioxide / conductive polymer composite material. This metal oxide / mesoporous manganese dioxide / conductive polymer composite material can be used to prepare lithium battery cathode materials with high specific capacity, high conductivity, and high stability in a simple, efficient, and low-cost manner. It is easy to industrialize and solves the problems of low conductivity and poor rate discharge performance of traditional metal oxide cathode materials.

This invention discloses a method for preparing porous carbon materials. First, the reactants undergo in-situ oxidative polymerization in a solution of methyl orange and ferric chloride to generate a polymer precipitate. The polymer precipitate is washed with acid and water, and dried to obtain polymer powder. Then, the polymer powder is mixed uniformly with a molten salt system in a predetermined ratio to obtain a mixture. Under an inert atmosphere, the mixture is heated to 400°C for pre-carbonization for 1-4 hours at a heating rate of 2-10°C / min, and then heated to 600-1000°C for carbonization for 1-4 hours. After the reaction is completed, residual salts are removed by washing with acid and water, and the porous carbon material is obtained after drying.

This invention relates to the field of fluorescence detection technology, specifically disclosing a dual-colorimetric fluorescent probe for detecting methyl orange, its preparation method, and its application. The probe is prepared by in-situ synthesis of carbon dots and copper nanoclusters. The carbon dots are synthesized from Bermuda grass as a precursor via a hydrothermal method, and the copper nanoclusters are obtained by reducing copper ions with penicillamine and bovine serum albumin as dual stabilizers. The dual-colorimetric fluorescent probe provided by this invention has a detection limit for methyl orange as low as 0.06 μM, exhibiting good selectivity, stability, and anti-interference ability. It can be applied to the spiked recovery detection of methyl orange in actual water samples and can achieve visualized semi-quantitative analysis through filter paper loading, making it suitable for rapid on-site screening.

The application discloses a kind of Graphene Oxide / Bi 12 TiO 20 Preparation method and application of composite photocatalyst, to solve the existing Bi 12 TiO 20 Photocatalyst photo-generated carrier is fast, and it is easy to produce miscellaneous phase in preparation, leading to the technical problems such as low catalytic activity. First, Bi 12 TiO 20 Powder, such as Bi / Ti=4:1 or 6:1, then the Bi 12 TiO 20 Powder is compounded with single-layer GO dispersion under the action of ultrasonic wave. The Graphene Oxide / Bi 12 TiO 20 Composite photocatalyst prepared by the method is mixed with methyl orange (MO) solution under simulated visible light for 20 minutes, and the degradation rate of methyl orange reaches 98.2%, and the first-order kinetic reaction rate constant k value is 0.2167 min ‑1 , which can be widely applied in the field of visible light catalytic degradation of organic pollutants.

This invention relates to the field of photoelectrocatalytic material preparation technology, specifically to a Bi2O2S / N-BiVO4 photoanode and its preparation method and application; including the following steps: (1) preparation of Bi2O2S; (2) preparation of BiVO4; (3) preparation of N-BiVO4, wherein the BiVO4 photoanode prepared in step (2) is placed in an ammonia protective atmosphere and calcined; (4) preparation of Bi2O2S / N-BiVO4 photoanode, wherein an ethanol solution of Bi2O2S is dropped onto the surface of N-BiVO4 obtained in step (3), the N-BiVO4 loaded with the solution is spin-coated, and then the electrode is heat-treated to obtain the Bi2O2S / N-BiVO4 photoanode; in the experiment of photoelectrocatalytic degradation of methyl orange, the Bi2O2S / N-BiVO4 photoanode of this invention showed a high degradation rate of 99.62%.

The application discloses a luminescent coordination polymer crystal material based on a tetraphenylethylene pyridine ligand and a preparation method and application thereof, the chemical formula of the luminescent coordination polymer crystal material is [Cu(L)SCN.DMSO]n, wherein L is a 4.4'-[(2,2-diphenyl ethylene)di-4.1-phenylene]bis[pyridine] ligand, and n is an arbitrary value; wherein a Cu ion forms a two-dimensional structure with the 4.4'-[(2,2-diphenyl ethylene)di-4. n The crystal material can be used for fluorescence quenching detection of water-phase methyl orange; compared with the prior art, the crystal material is simple and reliable in application, the quenching constant of the crystal material for detecting water-phase methyl orange is as high as 1.9*10 6 M ‑1 , and the detection limit is as low as 0.019 mu M, so the crystal material is a luminescent coordination polymer crystal material for extremely sensitive detection of methyl orange at present and has a wide application prospect.

The application discloses a kind of dual-wavelength ultraviolet light synergistic ozone micro-nano bubble treatment methyl orange wastewater method, belong to wastewater treatment technical field.The method is first to the micro-nano bubble generator is carried out organic solvent ultrasonic cleaning, deionized water flushing and drying pretreatment, then preparation ozone micro-nano bubble water, finally under the condition of stirring ozone micro-nano bubble water is mixed with methyl orange solution, through UV-222 and UV-254 dual-wavelength ultraviolet lamp irradiation realizes methyl orange degradation.The application combines the synergistic effect of ozone micro-nano bubble and dual-wavelength ultraviolet light, strengthens hydroxyl radical generation and organic matter photolysis, improves methyl orange decolorization and mineralization efficiency, can also photolyze debromination to avoid bromate byproduct, whole process does not need to add reagent, no sludge is generated, equipment system is simple and easy to control, applicable to the treatment of methyl orange azo dye wastewater, with good engineering application value.

The invention discloses a preparation method, a product and application of a Co / CN coated SiO2 composite material, and belongs to the technical field of wastewater treatment. The Co / CN coated SiO2 composite material comprises a silicon dioxide carrier, cobalt nanoparticles loaded on the carrier and a carbon nitrogen layer coated on the surfaces of the cobalt nanoparticles. The preparation method comprises the following steps: firstly, preparing the silicon dioxide carrier; and mixing cobalt nitrate hexahydrate, the silicon dioxide carrier and a buffer solution, stirring, adding dopamine, reacting at room temperature to obtain a black brown product, washing, and calcining in an inert atmosphere to obtain the Co / CN coated SiO2 composite material. The material can efficiently catalyze and degrade organic dyes such as bisphenol A, methyl orange and the like in the presence of peroxymonosulfonate, has the advantages of mild reaction conditions, high catalytic activity, good stability and the like, and is suitable for treating organic polluted wastewater.

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 application provides a Cu2O / SiC / g-C3N4 ternary composite material and a preparation method and application thereof, and relates to the technical field of catalysts.The p-n junction is constructed between Cu2O and g-C3N4, and the Z-scheme heterojunction is constructed between Cu2O and SiC, the two mechanisms synergistically act, can effectively promote the separation of electrons and holes from the Cu2O photocatalyst, form an equivalent wide band gap, fully utilize the strong oxidizing property of the valence band of SiC and the strong reducing property of the conduction band of Cu2O, thereby greatly improving the photocatalytic performance;the proportion of the Cu2O / SiC / g-C3N4 ternary composite material prepared by the application as a photocatalyst in degrading methyl orange water pollutants within 110min can reach 93.70%.The preparation method of the application can realize the compounding of the three materials by adopting two simple processes of calcination and hydrothermal treatment, has the advantages of less raw materials, simple synthesis process and good repeatability, also has the basic conditions of large-scale production, and higher application potential and use value.

This invention discloses a bismuth oxide composite sponge-supported photocatalyst, its preparation method, and its application, belonging to the technical field of photocatalytic wastewater treatment. This invention uses bismuth oxide and melamine sponge as the catalyst and support, respectively, through Ca... 2+ Crosslinking anchors bismuth oxide in a sodium alginate gel network, which is then loaded onto a melamine sponge framework, forming a three-in-one functional interface of "adsorption-enrichment-catalysis". This effectively combines the excellent adsorption performance of melamine sponge, the chelating enrichment capacity of sodium alginate, and the photocatalytic activity of bismuth oxide. Relying on the synergistic coupling effect of adsorption and photocatalysis, the pollutant removal efficiency is significantly improved, thereby achieving the goal of economical, efficient, rapid, thorough, and harmless treatment of methyl orange and hexavalent chromium wastewater.

The invention relates to a three-dimensional carbon nitride-chitosan cellulose aerogel and a preparation method and application thereof.The preparation method comprises the following steps that microcrystalline cellulose is added into an alkali / urea / water composite solvent subjected to freezing pretreatment to obtain cellulose suspension liquid, polyethyleneimine is added into the cellulose suspension liquid, and the cellulose suspension liquid is stirred to be uniform; carrying out amino modification treatment to obtain a modified cellulose suspension; freezing the modified cellulose suspension, sequentially adding chitosan and carbon nitride, and uniformly mixing to obtain a mixed solution; adding epichlorohydrin into the mixed solution, uniformly mixing, and carrying out water bath reaction to obtain CN-coated CA / CS hydrogel; and carrying out post-treatment on the CN-coated CA / CS hydrogel to obtain the three-dimensional carbon nitride-chitosan cellulose aerogel. The three-dimensional carbon nitride-chitosan cellulose aerogel prepared by the invention can realize broad-spectrum efficient removal of different charge types of dyes such as methylene blue, methyl orange and rhodamine in water, is good in structural stability, and ensures that the material has good reusability.

The application discloses a power plant circulating water intelligent dosing, water supplementing and pollution discharging method and device, and belongs to the field of circulating water treatment. The method comprises the following steps: measuring the pH value of circulating water, calculating the methyl orange alkalinity of the circulating water, then calculating the target value of the calcium hardness of the circulating water and the evaporation amount of the circulating water; and determining the dosing amount, the pollution discharging amount and the water supplementing amount according to the pH value of the circulating water, the calcium hardness of the circulating water and the evaporation amount of the circulating water. The device controls the automatic dosing system, the water supplementing system and the automatic pollution discharging system through a DCS online control system to complete precise dosing, water supplementing and pollution discharging. The application can improve the quality of circulating water, and the dosing, water supplementing and pollution discharging of the circulating water are accurate, the intelligent dosing, water supplementing and pollution discharging of the circulating water are realized, and the purposes of saving water and improving the quality of circulating water are achieved.

The invention belongs to the field of new energy and anion exchange membrane water electrolysis hydrogen production, and particularly relates to a preparation method of a PPy-CS-DIM nanotube composite anion exchange membrane. According to the preparation method, a chemical oxidation method is adopted, methyl orange and ferric chloride are utilized to form a self-assembled nanotube template, and meanwhile, quaternized starch and 1, 2-dimethylimidazole are introduced to prepare the ternary composite nanotube based on polypyrrole. The PPy-CS-DIM nanotube has a unique confinement micropore effect, and an efficient and ordered hydroxyl ion transmission channel can be constructed, so that the ionic conductivity of the membrane is greatly improved. The nanotube is added into a polymer OPBI substrate, and a high-performance OPBI anion exchange membrane can be prepared. By adjusting the doping content of the PPy-CS-DIM nanotube, the ionic conductivity of the OPBI membrane is optimized, and compared with a pure OPBI anion exchange membrane, the ionic conductivity of the obtained composite anion exchange membrane is remarkably improved.

The invention belongs to the field of filtration and adsorption of anionic dye methyl orange in a water system, and relates to a BiOBr / NiFe-LDH composite material as well as a preparation method and application thereof. The method comprises the following steps: adding a nickel source, an iron source and a slow-release alkali source into deionized water, and mixing and stirring to obtain a uniform solution; performing hydrothermal reaction on the uniform solution, cooling to room temperature after the reaction is completed, and sequentially performing washing, suction filtration, drying and grinding to obtain NiFe-LDH powder; and adding the NiFe-LDH powder into a bromine source and a bismuth source, and carrying out ultrasonic treatment to obtain the BiOBr / NiFe-LDH composite material. The problems that an adsorption material is poor in methyl orange selectivity, poor in adsorption performance and the like are solved.

The application relates to the technical field of photocatalysts, and discloses a BiOCl nanosheet doped PVDF composite film and a preparation method thereof. The preparation method of the nanosheet doped PVDF composite film is as follows: the nanosheet is surface-modified by using an alkenylated catechol type quaternary ammonium salt modifier to obtain an alkenylated nanosheet, wherein the nanosheet is any one of a BiOCl nanosheet, a Ni-BiOCl nanosheet and a Co-BiOCl nanosheet; a carbon-carbon double bond is formed through a dehydrofluorination reaction by alkali treatment to obtain modified PVDF powder; under the action of an initiator, the alkenylated nanosheet and the modified PVDF powder are subjected to a free radical polymerization reaction to obtain a composite film material; the composite film material is added into N,N-dimethylacetamide to form a casting solution; the casting solution is laid on a glass plate and is subjected to blade coating; and a nanosheet doped PVDF composite film is prepared through an immersion precipitation phase inversion method; and the film product can degrade methyl orange dye.

This invention relates to the field of monitoring corrosion morphology and pH dynamic distribution in steel, and particularly to a rapid and intelligent monitoring method and system for in-situ monitoring of pitting morphology and surrounding pH dynamic distribution during electrochemical testing of steel pitting corrosion. First, an in-situ steel test sample with an observation surface is prepared and encapsulated, and then horizontally mounted in an adjustable electrolytic cell. Next, a methyl orange calibration solution with a pH gradient of 1-7 is prepared, and images of the sample at different pH values ​​are captured and imported into the system for calibration, establishing a quantitative mapping relationship between pH and the Lab values ​​of the calibrated images. Finally, in-situ electrochemical testing is conducted in a colorless salt test solution containing the same concentration of methyl orange, simultaneously monitoring the morphology of pitting initiation and development, as well as the dynamic evolution of the surrounding pH. This system can achieve millisecond-level dynamic in-situ monitoring of the spatial distribution of pH around pitting corrosion during the corrosion growth process, and can continuously capture real-time pH evolution information during the initiation and expansion of pitting corrosion.

The invention relates to the technical field of environmental functional materials, and discloses a coal gangue biochar composite adsorption material and a preparation method and application thereof.The coal gangue biochar composite adsorption material is prepared by taking coal gangue and biomass (bamboo powder, wheat straw and the like) as composite raw materials through pretreatment, phosphoric acid modification, nitrogen atmosphere high-temperature pyrolysis and Fe3O4 magnetic loading. In the preparation process, the pore structure of the material is optimized through phosphoric acid modification, the material is endowed with the magnetic separation characteristic through magnetic loading, and waste resource utilization is achieved through compounding of coal gangue and biomass. The material is excellent in adsorption performance, can efficiently treat sewage containing organic dyes such as heavy metal ions and methyl orange, can be quickly separated and recycled through an external magnet after adsorption, is simple in preparation process, low in cost, environment-friendly and suitable for large-scale industrial application, and has important significance on printing and dyeing wastewater treatment and solid waste recycling.

The current invention describes the synthesis of heterogeneous composite comprising laponite and heptamolybdate by wetness impregnation method. Different experimental settings were used to carry out the synthesis, including the heptamolybdate ammonium dose (1.5, 1 or 0.5 g), ion exchanger dose tetrabutyl ammonium bromide (0.5, 0.25 or 0.125g), reaction duration (12 or 24h) and calcination temperature (200, 300 and 400 °C) for 2 hours. The optimal synthesis composition of the laponite / molybdate (Lap-Mo) is as follows: 5 g of Lap + 0.5 g of TBA + 1.5 g of heptamolybdate ammonium with reaction duration of 24 h and a calcination temperature of 300 °C for 2 hours under air. The laponite / molybdate composite have been used in an AOP to degrade MB dye in presence of H2O2 as an oxidant under visible light radiation. The AOP experiment have been optimized using RSM based on BBD. Under the optimum conditions: contact time=72 min, [H2O2 / Lap-Mo] wt% ratio= 1.24, dye concentration= 20.95 mg.L-1 pH= 8.3 reaching a 99% of degradation rate. The Lap-Mo catalyst degradation efficiency was also tested for other dyes such as safranin T (ST) and rhodamine B (RhB) as cationic dyes and methyl orange (MO) as anionic dye. Indeed, they exhibits a highly degradation rate equal to 96, 90 and 89% for ST, RhB and MO, respectively. Advantageously, the invention intends to promote, profitably, and efficiently dye degradation using the laponite / molybdate composite. Furthermore, the potential of the invention falls within the framework of improving wastewater treatment and paves the way to more areas of application in multiple industries.

The application discloses a preparation method of MOFs film for removing methyl orange in aqueous solution, and relates to the technical field of water purification.The preparation method comprises the following steps: ultrasonic mixing of 1,3,5-benzene tricarboxylic acid and N,N-dimethylformamide, then adding zirconium oxychloride and formic acid for ultrasonic mixing, heating reaction under airtight condition, sequentially immersing in N,N-dimethylformamide and acetone after centrifugation, and drying to obtain a metal-organic framework material; mixing the metal-organic framework material, polyether sulfone and N,N-dimethylacetamide, then coating on a glass plate, drying to form a film, and separating to obtain the MOFs film for removing methyl orange in aqueous solution.The MOFs film has stable structure, can efficiently remove methyl orange molecules in aqueous solution, and has good recycling performance.

This invention belongs to the field of adsorbent technology, specifically relating to a covalent organic framework material Tp-ODA COF, its preparation method, and its applications. The Tp-ODA COF is composed of alternating 1,3,5-trialdehyde phloroglucinol and 4,4'-diaminodiphenyl ether linked by imine bonds, forming a periodic repeating unit and a porous network structure with a symmetry of P1. The repeating unit is a two-dimensional layered conjugated framework formed by covalently linking 1,3,5-trialdehyde phloroglucinol and 4,4'-diaminodiphenyl ether through imine bonds. The molecular formula of the repeating unit is C1. 54 H 36 N6O9. The covalent organic framework material Tp-ODA COF of the present invention exhibits efficient and stable adsorption performance for anionic dyes. Under the conditions of 25°C and pH=6, the maximum adsorption capacity for Congo red and methyl orange reaches 1532 mg / g and 1490 mg / g, respectively.

The invention relates to the technical field of photocatalysts, and discloses a BiOCl nanosheet doped PVDF composite membrane and a preparation method thereof.The preparation method of the nanosheet doped PVDF composite membrane comprises the steps that a nanosheet is subjected to surface modification through an alkenylation catechol type quaternary ammonium salt modifier, an alkenylation nanosheet is prepared, and the nanosheet is any one of a BiOCl nanosheet, a Ni-BiOCl nanosheet and a Co-BiOCl nanosheet; performing dehydrofluorination reaction through alkali treatment to form carbon-carbon double bonds, so as to prepare modified PVDF powder; carrying out free radical polymerization reaction on the alkenylated nanosheets and the modified PVDF powder under the action of an initiator to prepare a composite membrane material, and adding the composite membrane material into N, N-dimethylacetamide to form a membrane casting solution; spreading the membrane casting solution on a glass plate, scraping the membrane, and preparing the nanosheet doped PVDF composite membrane through an immersion precipitation phase conversion method, and the membrane product can degrade methyl orange dye.

The invention provides a high-catalysis and easy-to-recover titanium oxygen cluster modified TiO2 catalyst as well as a preparation method and application thereof. According to the preparation method, TiO2 is modified through {Ti18O27} titanium oxygen clusters, atomic-scale accurate modification is realized by utilizing a unique pentagonal prism structure of the {Ti18O27} titanium oxygen clusters and interaction of sulfate radicals and water ligands on the surfaces of the {Ti18O27} titanium oxygen clusters and the surface of a TiO2 carrier, the {Ti18O27} titanium oxygen cluster modified TiO2 catalyst is successfully obtained, the specific surface area and the pore structure of the catalyst are greatly increased, the light absorption and charge separation efficiency is enhanced, and the application prospect is wide. The obvious band gap narrowing is realized, and the light response range is successfully expanded to a visible light region. Under the irradiation of visible light (lambda is greater than or equal to 400 nm), the degradation rate on a typical pollutant methyl orange can be more than 3 times of that of unmodified TiO2, and excellent visible light catalytic activity is shown.

The invention relates to a gel ridge stone-based double-layer structure material and a preparation method thereof, and belongs to the technical field of new materials. The invention aims to solve the technical problems of no adsorption performance on anion pollutants and low use additional value of the existing gel ridge stone. According to the invention, a double-layer composite structure material is formed by in-situ growth of hydrotalcite nanosheets on the surface of a gelled stone serving as a growth template through a hydrothermal method. The preparation method comprises the following steps: preparing a precursor solution, dispersing the gelled stone, carrying out hydrothermal reaction, washing, drying and the like. The material has the lamellar characteristics of the kaolinite and the hydrotalcite, can adsorb zwitterionic pollutants such as methyl orange and methylene blue at the same time and can load zwitterionic corrosion inhibitors such as NO2 <-> and Ce < 3 + >, the adsorption capacities can reach 78-86 mg / g and 63-72 mg / g respectively, the functional diversity and additional value of the kaolinite are remarkably improved, and the application potential of the kaolinite in the fields of water purification and corrosion inhibition is expanded.

The present invention discloses a method and system for measuring the precipitation rate of inorganic salts in water, an electronic device, and a storage medium. The method includes steps S1, S2, and S3. The steps include: (1) acquiring the type of precipitated inorganic salt in the sample water; (2) acquiring the inorganic carbon methyl orange alkalinity (Cmalk); (3) acquiring the initial content of the target inorganic salt; (4) acquiring the initial content of the target inorganic salt; (5) acquiring the carbon dioxide concentration (CO2w) or its equilibrium gas-phase carbon dioxide concentration (PCO2) in the sample water in a sealed, constant-temperature, constant-pressure environment; (6) acquiring the amount of precipitated target inorganic salt based on the data acquired in steps S1 and S2; and (7) acquiring the precipitation rate of the target inorganic salt based on the amount of precipitate acquired in step S3. The present invention provides a method for measuring the precipitation rate of inorganic salts in water with minimal manual intervention, a low lower limit of quantification, and high accuracy.

The application discloses a kind of Bi 12 TiO 20 Preparation method of photocatalyst and its application in photocatalytic degradation of organic pollutants, the specific steps include: 1) preparation contains bismuth and titanium's hydroxyl oxide precipitate suspension;2) adding mineralizer to the suspension, stirring uniformly, to obtain reactant;3) the reactant is transferred to the inner container of reactor, adjust the reactant in the inner container of reactor with deionized water, stir uniformly;4) the inner container of reactor is placed in the reactor, seal, and hydrothermal treatment is carried out;5) let the reactor cool to room temperature naturally, repeatedly wash the reaction product with deionized water, filter, dry, and Bi 12 TiO 20 Photocatalyst powder is obtained.The pure phase Bi 12 TiO 20 Powder prepared by the application can be irradiated under simulated visible light for 90 minutes, and the degradation rate of methyl orange solution (MO) reaches 98.15%, and the first-order kinetic reaction rate constant k value is 0.02658 min ‑1 , which can be widely applied in the field of visible light catalytic degradation of organic pollutants.

The invention provides a method for determining the content of carbon dioxide fixed in steel slag, which comprises the following steps: sample reaction: carrying out heating reaction on a to-be-detected steel slag sample and phosphoric acid in a reaction bottle to release carbon dioxide fixed in the steel slag; carbon dioxide absorption: introducing the reacted gas into an absorption reaction bottle containing a potassium hydroxide solution to obtain an absorption liquid; titration analysis: sequentially adding a phenolphthalein indicator and a methyl orange indicator into the absorption liquid of the absorption reaction bottle, carrying out step-by-step titration by using a hydrochloric acid standard titration solution, and recording the volume of consumed hydrochloric acid; and content calculation: calculating the content of the fixed carbon dioxide in the steel slag based on the concentration of the hydrochloric acid standard titrating solution, the volume of the consumed hydrochloric acid standard titrating solution and the mass of the steel slag sample. The method can be used for accurately and rapidly measuring the carbon sequestration amount in the steel slag so as to evaluate the steel slag carbon sequestration effect or detect the operation effect of a steel slag carbon sequestration facility.