76 results about "Chromic Ion" patented technology

The invention relates to the technical field of coatings, in particular to a PVD (Physical Vapor Deposition) coating process method applied to a galvanized sheet stamping die, which comprises the following steps of: pretreating the die, cleaning the surface of the die by a wet process, placing the die in a vacuum deposition cavity, vacuumizing, and heating to a preset temperature in an inert gas environment; plasma pretreatment is conducted on the surface of the mold, a high-power pulse magnetron sputtering cathode of a chromium target is selected to discharge in the argon working environment to generate plasma rich in chromium ions, and negative bias voltage is applied to the mold; starting at least one unbalanced magnetron sputtering cathode, gradually increasing the target current by the unbalanced magnetron sputtering cathode in a current ramp-up mode so as to improve the target voltage, and synchronously introducing nitrogen as a reaction gas, so that a nitride transition layer is deposited on the surface of the mold; and a high-power pulse magnetron sputtering cathode and an unbalanced magnetron sputtering cathode synchronously work on the transition layer to carry out multi-source reactive sputtering deposition, so that a multi-layer hard coating formed by alternating titanium aluminum vanadium and chromium nitride is formed. By combining the high-power pulse magnetron sputtering technology and the unbalanced magnetron sputtering technology, the problems that in the prior art, a coating is poor in adhesive force and insufficient in high temperature resistance are solved.

The application belongs to the technical field of composite membrane materials, and particularly relates to a preparation method and application of a super-hydrophilic composite membrane capable of removing various pollutants in water bodies; the preparation method comprises the following steps: preparing a bimetallic organic framework material FeZr-MOF through a one-step solvothermal method; dispersing FeZr-MOF powder in a suitable solvent, mixing, adding polyvinylidene fluoride and polyvinylpyrrolidone, stirring under water bath conditions at 30-80 DEG C, obtaining a uniformly mixed casting solution, and then preparing a FeZr-MOF / PVDF composite membrane through a non-solvent induced phase separation method after ultrasonic defoaming treatment; then, a polyaniline coating layer is in-situ polymerized on the surface of the composite membrane to obtain a PANI / FeZr-MOF / PVDF composite membrane. The super-hydrophilic composite membrane capable of removing various pollutants in water bodies has good effects in oil-water separation, removal of antibiotics and chromium ions in water and the like.

The invention provides a method for detecting and analyzing heavy metal chromium in high-aluminum ore and red mud, and belongs to the field of mineral analysis and detection. The method comprises the following steps: melting a mixture of a sample to be detected and a strong alkaline flux to obtain a melt; extracting and dissolving the melt by using a dilute acid solution to obtain a leaching solution; a strong oxidant and a catalyst are added into the leachate, so that chromium ions in the leachate are oxidized into hexavalent chromium ions, and hexavalent chromium conversion liquid is obtained; adding an alkali carbonate solution into the hexavalent chromium conversion solution to adjust the pH value of the hexavalent chromium conversion solution to 8-10 to obtain a mixed solution; filtering the mixed solution to obtain a chromium-containing filtrate; and quantifying the total chromium content in the chromium-containing filtrate by adopting a spectrophotometric method. The detection and analysis method provided by the invention can ensure that chromium existing in lattices of the high-aluminum ore and red mud sample is completely released, and main matrix interference elements such as aluminum, iron, calcium and magnesium in the sample can be effectively separated, so that accurate determination of the total chromium content in the to-be-detected sample is realized.

The disclosure generally relates to ready to drink electrolyte solution. In particular the disclosure relates to a ready to drink electrolyte solution comprising isomaltulose, glucose, sodium ions, chromium ions and water; wherein the glucose concentration is greater than or equal to 0.9g / 100ml, and wherein the theoretical glycemic index of the solution is equal to or less than 55. The disclosure also relates to a method of manufacturing said ready to drink electrolyte solution. The disclosure also relates to a method of rehydrating a patient suffering from cancer, diabetes, acute or chronic illness, or a gastrointestinal disorder by using said ready to drink electrolyte solution.

The present invention relates to the use of a trivalent chrome plating bath composition for the electrodeposition of a hard chrome layer with a thickness of 1 µm or more, the composition comprising (A) trivalent chromium ions in an amount of 5-40 g / l, (B) at least one anion selected from sulfate, chloride, bromide and methanesulfonate, (C) at least one carboxylate ion selected from formate and acetate, (D) at least one buffer substance selected from ammonia, boric acid, carboxylic acids with 2 to 8 carbon atoms other than component (C) and salts thereof, and aluminium salts, and (E) 0.01 to 100 g / l of at least one specific compound which comprises a sulfonate group and a sulfide or disulfide group. Other aspects of the invention relate to a hard chrome plating process, a hard chrome plating layer and a hard chrome plated article.

The application relates to a chromium ion form analysis method based on electrochemical and Raman bimodal detection signals. Au-Ag Janus NPs solution is added dropwise on the surface of a glassy carbon electrode, the DPV signal value and the Raman signal value of a to-be-detected solution containing Cr 6+ and Cr 3+ are detected, the concentration of Cr 6+ in the to-be-detected solution is obtained, Cr 6+ in the to-be-detected solution containing Cr 3+ and Cr 3+ is oxidized into Cr 6+ under the conditions of strong alkalinity and heating by using potassium permanganate, then a reducing agent is added to obtain a mixed solution, the concentration of Cr 6+ in the mixed solution is detected through the DPV signal value and the Raman signal value, Cr 3+ is completely converted into Cr 6+ , the total chromium concentration is measured, finally the concentration of Cr 3+ is obtained by subtraction, and finally the chromium ion form analysis is realized. The method improves the accuracy and efficiency of Cr ion form detection, and is suitable for rapid analysis of Cr ion forms in environment and biological samples.

The utility model discloses a device for preparing a leather tanning agent by recycling chromium-containing wastewater, which comprises an equipment base and a recycling sedimentation tank, the recycling sedimentation tank is mounted on the equipment base, and a uniform reactant moving and throwing structure is mounted on the recycling sedimentation tank; the utility model relates to the technical field of waste water recovery equipment, and has the beneficial effects that the problems that in the existing waste water treatment, reactants are directly and manually fed into chromium-containing waste water for reaction and precipitation, but fixed feeding is mostly adopted, so that the reactants are not fully mixed with the waste water, the precipitation efficiency of chromium ions and the quality of tanning agents are influenced, and the production cost is high are solved; and the problems that the operation complexity and the energy consumption are increased due to the fact that the sediment directly sinks at the bottom of the reaction tank, cleaning and maintenance are inconvenient, and an integrated movable throwing and sediment discharging system is lacked are solved.

A luminescent material is a complex with the following structural formula: wherein R and R' are independently selected from oxygen, amino, C1-C18 straight-chain or branched alkyl-substituted amino, phosphin, C1-C18 straight-chain or branched alkyl-substituted phosphin, sulfur, and selenium; R1, R2, R3, R4, R5, and R6 are independently selected from hydrogen, C1-C18 straight-chain or branched alkyl or halogen-substituted C1-C18 straight-chain or branched alkyl, aromatic... Aromatic groups such as benzene, thiophene, and furan, n = 1–3, are used to construct cyclic ligand skeletons with different half-ring numbers. Ln is one of the following: cerium trivalent ion, europium divalent ion, ytterbium divalent ion, and samarium divalent ion. M is one of the following: manganese divalent ion, cobalt trivalent ion, chromium trivalent ion, vanadium trivalent ion, and ferric trivalent ion. X is a monovalent ion, such as halogen, cyanide, thiocyanate, isothiocyanate, etc., m = 0–3, l = 3–6. X acts as a monodentate ligand or as a bridging bidentate ligand.

The invention relates to a chromium ion single-doped ultra-wideband near-infrared fluorescent material, a preparation method thereof and an LED device, and belongs to the technical field of luminescent materials. The chemical composition formula of the material is Ca2Sc1-yYyGa3-3xSn2O12: xCr, x is larger than or equal to 0.003 and smaller than or equal to 0.10, and y is larger than or equal to 0.00 and smaller than or equal to 1.00. The material is high in phase purity, simple in preparation process, simple and convenient to operate, environment-friendly and high in synthesis efficiency. Under excitation of 475-500 nm, the emission spectrum of the material covers the range of 600-1600 nm, the material has high luminous intensity in a first near-infrared region (about 855 nm) and a second near-infrared region (about 1300 nm), and the full width at half maximum can reach 200-655 nm. Meanwhile, the material has good absorption in the range of 400-700 nm, can be effectively matched with a commercial blue light LED chip, and is suitable for preparing a high-performance near-infrared LED light source. Compared with the prior art, the material provided by the invention not only can realize ultra-wideband emission covering a first near-infrared area and a second near-infrared area, but also is adjustable in emission peak position and high in absorption characteristic and commercial blue light chip compatibility, and is beneficial to development of high-efficiency and high-stability near-infrared LED devices.

The application discloses a chromium-doped ultra-wideband near-infrared fluorescent material and a preparation method thereof. 2‑x A x Si2O7:yCr M , wherein A is one or more of Y, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Ga, 0<=x<=0.5, 0.001<=y<=0.3, and M is one or more of 3+ and 4+. The preparation method comprises the following steps: taking raw materials according to the stoichiometric ratio, grinding and mixing; pre-calcining at 600-1200 DEG C under an air atmosphere; grinding again after cooling, calcining at 1200-1600 DEG C, keeping warm, and cooling to room temperature. The fluorescent powder can be efficiently excited by blue light, emits near-infrared light covering the NIR-I and NIR-II regions, and the peak position and half-height width of the emission spectrum can be regulated by adjusting the molar concentration of A ion replacing Sc and the chromium ion doping concentration.

This application discloses a hydrochloric acid-based vanadium-iron-chromium electrolyte, its preparation method, and a flow battery, relating to the field of batteries. The hydrochloric acid-based vanadium-iron-chromium electrolyte contains 1.0~2.5 mol / L vanadium ions, 0.15~2.0 mol / L ferrous ions, 0.1~1.7 mol / L chromium ions, 3.0~4.5 mol / L hydrogen ions, and 0.001~0.05 mol / L hydrogen evolution inhibitor. The technical solution of this application utilizes a hydrochloric acid-based vanadium-iron-chromium electrolyte formed with specific concentrations of vanadium ions, ferrous ions, chromium ions, hydrogen ions, and a hydrogen evolution inhibitor. This electrolyte is suitable for use as the positive and negative electrode electrolytes in flow batteries, significantly improving the energy efficiency and cycle stability of the flow battery. Furthermore, the introduction of relatively inexpensive iron reduces the system's dependence on expensive vanadium resources and lowers production costs.

The invention discloses a method for removing heavy metal chromium ions in wastewater, and belongs to the technical field of industrial wastewater treatment and heavy metal pollution treatment. The method comprises the following steps: constructing a packed bed electrodialysis system in which a light chamber is filled with an ion exchanger, sequentially introducing chromium-containing wastewater to be treated into the light chamber, respectively introducing a sodium sulfate aqueous solution into a concentrated chamber and a pole chamber, applying direct current, and adopting frequent pole reversal operation. According to the method, deep removal is achieved through selective adsorption of the ion exchanger on chromium ions, efficient separation and concentration of the chromium ions are achieved through an ion channel constructed by the direct-current electric field, the ion exchange membrane and the ion exchanger, and meanwhile in-situ regeneration and reuse of the ion exchanger are achieved by periodically switching the direction of the electric field. The continuous advanced treatment of the chromium-containing wastewater can be realized, the hexavalent chromium concentration of the effluent is stably lower than 0.5 mg / L, the chromium recovery rate exceeds 90%, secondary hazardous waste pollution is avoided, the operation energy consumption is low, the cost is low, and large-scale industrial application is easy.

The invention belongs to the technical field of adsorption materials, and particularly relates to a preparation method and application of a high-entropy adsorption material. The method comprises the following steps: dissolving soluble salts of three or more divalent ions and two or more trivalent ions in water to prepare a high-entropy stock solution; the method comprises the following steps: adjusting the pH value of a diethylenetriamine aqueous solution with a sodium hydroxide solution under stirring, then slowly adding a chloroacetic acid aqueous solution, and continuously stirring for reaction to obtain a modified solution; the preparation method comprises the following steps: soaking spanishneedles herb or bone sponge powder in a modification solution to obtain a modified carrier material, adding the modified carrier material into a high-entropy stock solution, adding a mixed aqueous solution of sodium hydroxide and sodium carbonate as a precipitator, reacting, and carrying out suction filtration to obtain a precipitate and a filtrate; and washing the precipitate with a diethylenetriamine pentaacetic acid solution, drying, and grinding to finally obtain the high-entropy adsorption material. The material has high chlorine adsorption performance, and can be applied to the fields of wastewater adsorption chlorine, fluorine, molybdenum and chromium ion treatment and the like.

The present invention refers to a controlled method for depositing a chromium or chromium alloy layer on at least one substrate, the method comprising the steps (a) providing an aqueous deposition bath, wherein the bath comprises - trivalent chromium ions, - bromide ions, - alkali metal cations in a total amount of 0 mol / L to 1 mol / L, based on the total volume of the deposition bath, and the bath has - a target pH within the range from 4.1 to 7.0, (b) providing the at least one substrate and at least one anode, (c) immersing the at least one substrate in the aqueous deposition bath and applying an electrical direct current such that the chromium or chromium alloy layer is deposited on the substrate, the substrate being the cathode, wherein during or after step (c) the pH of the deposition bath is lower than the target p H, (d) adding NH4OH and / or NH3 during or after step (c) to the deposition bath such that the target pH of the deposition bath is recovered.

This invention discloses a metal-organic framework material in which sulfonic acid and carboxylic acid groups are simultaneously coordinated with chromium ions, its preparation method, and its application. Belonging to the field of crystalline materials technology, the chemical formula is [Cr(OH)(SO3)(CO2)(C6H4)], and the ligand is p-sulfobenzoic acid. It is prepared by the following steps: p-sulfobenzoic acid and chromium chloride hexahydrate are ground and mixed to obtain a premix; the premix is ​​heated to 150-250℃ and reacted for 12-144 hours; after the reaction, the product is washed with ethanol, centrifuged, and dried to obtain the chromium-based metal-organic framework material. The obtained chromium-based metal-organic framework material exhibits excellent proton conductivity, with a conductivity reaching 8.54 × 10⁻⁶. ‑3 S·cm ‑1 (98%RH).

The invention relates to a method for treating chromium-containing wastewater by ion exchange, which comprises the following steps: (1) feeding chromium-containing wastewater into a primary cation exchange carbon fiber column, and sequentially backwashing, regenerating and leaching saturated cation exchange carbon fibers; (2) effluent in the step (1) enters an anion exchange fiber column, the anion exchange fiber column is composed of a second-stage anion exchange fiber column and a third-stage anion exchange fiber column which are connected in series, and saturated anion exchange fibers are sequentially subjected to backwashing, regeneration and leaching; and (3) enabling the anion exchange fiber regenerated eluent to enter a four-stage sulfonic cation exchange resin column. The method is suitable for treating industrial wastewater with relatively complex Cr (VI) pollution conditions, chromium ions in the wastewater are removed by adopting a multi-stage ion exchange coupling method, the chromium content in the treated wastewater can reach the national discharge standard, and the method has the characteristics of stable treatment effect, economy and high efficiency.

The invention relates to the field of passivation solutions, and particularly discloses a trivalent chromium black zinc passivation solution free of fluorine, nickel and phosphorus and a preparation process of the trivalent chromium black zinc passivation solution. The passivation solution comprises the following components: 400-600 g of pure water, 10-15 g of chromic nitrate, 1-3 g of maleic acid, 2-4 g of tartaric acid, 3-5 g of citric acid, 1.5-3 g of borax, 3-5 g of sulfosalicylic acid, 5-8 g of ferrous sulfate, 4-6 g of sodium nitrate, 2-4 g of a corrosion inhibitor, 1-1.5 g of a membrane surface conditioning agent, 1-3 g of an antioxidant and 2-5 g of a blackening enhancer. A complexing system is adopted to stabilize release of trivalent chromium ions, a passivation film layer is compact, uniform and not prone to floating, stable generation of the passivation film is facilitated, the passivation time range is wide, and the corrosion inhibitor is added for efficient corrosion inhibition; the blackening effect of the combined action of the blackening enhancer containing the molybdenum element and ferrous ions is adopted, and through the synergistic effect of the corrosion inhibitor, the blackening enhancer and other raw materials, the existing technical problems that an existing passivation solution is poor in appearance texture, high in equipment corrosion, insufficient in environmental protection property, low in film forming stability, high in blackening system cost, large in pollution and the like are solved.

This invention discloses a method for preparing hydrophobically modified alginate, belonging to the field of aerogel adsorption technology. The hydrophobically modified alginate of this invention can directionally adsorb chromium-containing wastewater, solving the problems of low capacity, poor water solubility, and slow adsorption rate of traditional biomass adsorbents. It also utilizes the synergistic effect of multiple functional groups to achieve full-coverage adsorption of chromium, exhibiting good adsorption capacity and stability in the deep treatment of industrial chromium-containing wastewater. This invention utilizes the oxygen-containing groups abundant in sodium lignosulfonate and sodium alginate, which can strongly complex and electrostatically adsorb chromium ions, and provide sites for subsequent chromium ion reduction. Furthermore, after modification with γ-aminopropyltriethoxysilane, potassium hexatitanate whiskers have amino groups on their surface, which can electrostatically attract chromium ions in water, achieving targeted capture of anionic chromium.

The invention provides a method for calculating the amount-of-substance ratio of iron ions to chromium ions in electrolyte and application thereof, the method for calculating the amount-of-substance ratio of iron ions to chromium ions in electrolyte comprises the following steps: determining the ion exchange capacity [IEC] of an ionic membrane used by an iron-chromium flow battery; setting the expected operating temperature T of the battery and the state of charge SOC of the electrolyte; calculating the ratio of the amount of substance of divalent iron ions to trivalent chromium ions according to the following formula: n (Fe < 2 + >) / n (Cr < 3 + >) = 0.1 alpha + 0.2 beta (T) + 0.5 gamma (SOC); alpha is a proportioning coefficient determined based on the ion exchange capacity of the ionic membrane; beta (T) is a temperature correction factor; gamma (SOC) is a correlation factor with the state of charge of the electrolyte. By adjusting the concentration ratio of main active substances in the initial electrolyte, the effects of controlling hydrogen evolution and inhibiting capacity fading of the iron-chromium flow battery can be achieved.

The invention provides a carbazole-thiazole Schiff base fluorescent probe as well as a preparation method and application thereof, and belongs to the technical field of fluorescent probes. The preparation method disclosed by the invention comprises the following steps: mixing a benzothiazole-2-formaldehyde solution and a 3-amino-9-ethyl carbazole solution, and then carrying out a Schiff base condensation reaction, so as to obtain the carbazole-thiazole Schiff base fluorescent probe. The preparation method disclosed by the invention is simple, mild in reaction condition, high in yield and low in cost; the fluorescent probe can identify and detect mercury ions, ferric ions, aluminum ions and chromium ions with high selectivity and high sensitivity through fluorescence and color dual signals, the detection limit is as low as nanomole level, and the fluorescent probe has high sensitivity. After being combined with different target ions, the probe respectively shows obvious color change and fluorescence enhancement under sunlight and ultraviolet light, can realize quick distinguishing by naked eyes, and has wide application prospects in the fields of environmental monitoring, biological imaging, food safety detection and the like.

The invention relates to a temperature-resistant and salt-resistant polymer chromium gel for deep profile control and flooding of an injection well and a preparation method of the temperature-resistant and salt-resistant polymer chromium gel. A temperature-resistant and salt-resistant polymer containing a controllable carboxylic acid group is adopted as a gel matrix, and efficient coordination crosslinking with trivalent chromium ions (Cr < 3 + >) is achieved by introducing sufficient carboxylate radical groups (-COO <->) into the polymer; meanwhile, the chain extensibility and the divalent ion interference resistance in a high-salt environment are improved by utilizing 20wt% of sulfonic groups (-SO3 <->). The prepared gel system can still stably form gel under the harsh oil reservoir conditions that the temperature is 70-100 DEG C and the total mineralization degree is 20,000 mg / L-60,000 mg / L (containing Ca < 2 + > and Mg < 2 + > is larger than or equal to 1,000 mg / L), the gel forming time is controllable (6-72 hours), dehydration and breakage are avoided within 90 days, and the application range of the chromium gel in deep profile control and flooding is remarkably widened.

The application discloses an amine group functionalized crown ether mediated V-Br-Cr-Cl bridging type all-vanadium redox flow battery composite electrolyte and application thereof. The positive electrode composite electrolyte comprises vanadium ions, bromide ions, a supporting electrolyte and an additive; the negative electrode composite electrolyte comprises vanadium ions, chromium ions, a supporting electrolyte and an additive; the supporting electrolyte is hydrochloric acid or a mixed acid of hydrochloric acid and sulfuric acid; in the positive electrode composite electrolyte, the molar concentration ratio of chloride ions to bromide ions is greater than or equal to 2; in the negative electrode composite electrolyte, the molar concentration ratio of vanadium ions to chromium ions is (0.5-5):1; and the additive is one of amine group functionalized 18-crown ether-6, 15-crown ether-5 and derivatives thereof. By introducing bromide ions and chromium ions into a traditional hydrochloric acid / sulfuric acid-hydrochloric acid mixed acid system and adding an amine group functionalized crown ether organic additive, a V-Br-Cr-Cl bridging coordination network is constructed, and the high-temperature resistance of the battery is significantly improved.

The utility model relates to a method of producing chemically activated carbon from pili nut shells for use as sorbents in removing heavy metals from aqueous solutions. The method comprises washing, drying, crushing, acid-treating, and sonicating the biomass prior to phosphoric-acid impregnation, followed by controlled pyrolysis under nitrogen flow, oxidation using breathing-grade air, and final drying and sieving to obtain uniform activated carbon particles. The activated carbon produced through the method described in this utility model contains phosphate-enriched and oxygen-containing functional groups that enhance its affinity toward nickel and chromium ions. The method also allowed for increasing porosity and the formation of phosphate and carbonyl groups on the activated carbon surface. These surface modifications results in improved heavy metal removal in water.

The application provides a method for detecting chromium (VI) ions based on an oxide nanometer enzyme (Cu-CeO 2 NPs) test strip. The application belongs to the technical field of heavy metal ion detection, and relates to a preparation of a Cu-CeO 2 NPs test strip and a new method for detecting chromium (VI) ions in water. The test strip is prepared by treating and drying a chromogenic reagent, a substrate, a buffer solution and a catalyst. The method is as follows: a vacuum-sealed test strip is taken out, a sample to be detected is dropped on the test strip, and a photo is taken by using a smart phone after reaction is completed. After the photo collected by the smart phone is processed by a corresponding software (ColorDetector), an RGB value is obtained, a standard curve is drawn according to the correlation between the R value read by the software and the chromium (VI) ions, and the concentration of the corresponding chromium (VI) ions in the sample to be detected can be measured by using a linear equation. The method has the advantages of high speed, simple operation and no need of large equipment, and has great advantages in real-time, rapid and visualized analysis of actual samples.

A trivalent chromium plating bath comprising: solvent; trivalent chromium ions; complexing agent; and one or more of an aminoalkanesulfonic acid, an aminoalkenesulfonic acid and an aminoarylsulfonic acid.

The present application relates to a kind of methods for improving the heat resistance of reverse copper foil, comprising: blackening process, ashing process, passivation process in the preparation process of reverse copper foil are carried out under acidic conditions;Wherein, blackening process is carried out in the electroplating solution A containing nickel ion, hypophosphorous acid ion, boric acid electroplating nickel;Ashing process is carried out in the electroplating solution B containing zinc ion, boric acid electroplating zinc;Passivation process is carried out in the electroplating solution C containing chromium ion, hypophosphorous acid ion, boric acid electroplating chromium.The present application is obtained under the combination of acidic blackening process, acidic ashing process, acidic passivation process, and the reverse electrolytic copper foil can meet the requirements of stripping strength and can meet the heat stability (small heat attenuation), solve the problem that conventional reverse electrolytic copper foil cannot meet the requirements of stripping strength while having good heat stability.

The application relates to the technical field of medicines, in particular to a kind of nanometer material for delivering UDP-GlcNAc and its preparation method and application.The application provides a kind of nanometer material for delivering UDP-GlcNAc, the nanometer material is prepared by co-precipitation method from metal ion and uridine diphosphate-N-acetylglucosamine;Wherein, the metal ion includes magnesium ion, calcium ion, iron ion, zinc ion, aluminum ion, copper ion, manganese ion, cobalt ion, nickel ion and chromium ion in any one of them.The efficient intracellular delivery is realized, and the drug action time is prolonged, which is beneficial to wide application.

The invention discloses a preparation method and application of a rare earth post-modified defective metal organic framework material which is mainly used as an adsorbent and a photocatalyst for recovery of chromium metal ions in industrial wastewater and photodegradation of phenolic pollutants, and belongs to the technical field of new material technology development. The rare earth post-modified defective metal organic framework material is obtained by reacting rare earth ions in a mixed solvent and then coordinating on the basis of a defective metal organic framework containing nitrogen coordination sites, the preparation method is simple, convenient and effective, the content of modified rare earth components is high, and the material is suitable for large-scale production. Under illumination, phenol organic pollutants in industrial wastewater can be degraded, and chromium ions can be adsorbed and recovered at the same time, so that a new thought is provided for recovering high-value metals and treating wastewater at the same time.

The invention discloses Sr < 2 + >-doped CaAl12O19: Cr < 3 + > dark red fluorescent powder and a preparation method thereof, the fluorescent powder takes Ca1-ySryAl12O19 as a matrix and doped trivalent chromium ions (Cr < 3 + >) as a luminescence center, and the doping concentration of Sr < 2 + > is 0-90 mol%. The excitation spectrum of the fluorescent powder shows two characteristic broadband of Cr < 3 + > ions, which are respectively located at 418 nm and 580 nm, the main excitation peak is located at 418 nm, and the emission spectrum of the fluorescent powder is broadband red light emission of about 685 nm. The fluorescent powder can effectively emit red light with the wavelength ranging from 680 nm to 700 nm under excitation of ultraviolet light with the wave band ranging from 350 nm to 450 nm. By regulating and controlling the doping proportion of Sr, when the doping mole fraction of Sr < 2 + > is 0.7 (namely y is equal to 0.7), the fluorescence performance is optimal, and the emission intensity is remarkably enhanced. Therefore, the fluorescent powder Ca1-ySryAl12O19: Cr < 3 + > has a good application prospect in the field of plant light supplement.

This invention discloses a method for separating vanadium and chromium in a vanadium-chromium solution, belonging to the field of wet separation of vanadium-chromium solutions. This method addresses the problem that existing technologies cannot achieve deep separation of vanadium and chromium. The method first adds a reducing agent to the vanadium-chromium solution, converting the highly soluble hexavalent chromate anion into a lower valence state, easily precipitated Cr. 3+ Cations, then add Mn 2+ The chromium removal agent efficiently precipitates trivalent chromium ions from vanadium-containing solutions, achieving deep separation of vanadium and chromium in the liquid phase. Compared with traditional chemical precipitation methods, the vanadium-chromium separation method of this invention has advantages such as high separation coefficient, simple and easy-to-use process, low equipment requirements, convenient operation, and suitability for industrial production.