9 results about "Dichromate ion" patented technology

The present invention discloses a multifunctional ionic porous organic cage material, its preparation method and chromium adsorption application, belonging to the technical field of porous organic materials. In the present invention, a porous organic cage material NKPOC-PH is synthesized using tetraaldehyde m-cyclocucurbit[4]arene and pyridine-3,5-dicarboxylic dihydrazide as reaction monomers, and then it is modified with methyl iodide to obtain ionic NKPOC-PH(I)Me. The present invention uses an easily modified porous organic cage as the substrate to construct triple synergistic adsorption sites of redox, coordination and electrostatics. Pyridine groups in the material are used as the introduction points of electrostatic sites, hydrazide linking groups as redox sites, and nitrogen-rich sites to adsorb dichromate ions through coordination. The obtained ionic porous cage can achieve an ultra-high chromium adsorption performance with a saturated adsorption capacity exceeding 1.3 g / g under acidic (pH = 3-4) aqueous phase conditions. The ionic porous organic cage material described in the present invention provides a new solution for adsorbing dichromate ions under aqueous phase conditions.

The invention discloses a carbon dot corrosion inhibitor with excellent corrosion inhibition and tracing performance, a preparation method and application, and relates to the technical field of corrosion inhibition of metal materials. The technical problems that in the prior art, a carbon dot corrosion inhibitor is prone to aggregation and instability in a high-temperature and strong-acid environment, and application is single are solved. The method comprises the following steps: firstly, taking citric acid and propargyl-PEG2-amine as raw materials, and dissolving the raw materials in deionized water to obtain a mixed solution; the mixed solution is placed in a high-pressure reaction kettle to be subjected to a hydrothermal reaction, and citric acid carbon dots modified by propargyl-PEG2-amine are prepared; sequentially carrying out centrifugation, dialysis and freeze drying treatment on the citric acid carbon dots modified by the propargyl-PEG2-amine, so as to obtain the citric acid carbon dots modified by the propargyl-PEG2-amine. The prepared carbon dot corrosion inhibitor can be used as a corrosion inhibition material in a high-temperature-resistant strong-acid environment, and can also be used for in-situ monitoring of dichromate ions in industrial wastewater and in-situ monitoring of iron ions and ferrous ions in underground water, surface water and drinking water so as to judge whether the content of the iron ions and the ferrous ions exceeds the standard or not.

The invention relates to the technical field of hazardous waste disposal and utilization, in particular to a technological method for co-disposal of chromic anhydride waste and waste zinc phosphide, which comprises the following steps: dissolving chromic anhydride waste in a dissolving tank according to a certain solid-to-liquid ratio, and hydrolyzing chromic anhydride to generate chromic acid; the method comprises the following steps: adding a certain proportion of an inorganic acid solution into a chromic acid solution, and combining chromate ions with hydrogen ions to generate dichromate ions under an acidic condition; transferring the solution into a closed first-stage reactor, and slowly stirring; according to the method, firstly, the method is suitable for chromic anhydride waste and zinc phosphide waste, waste chromate, dichromate waste and aluminum phosphide waste can be used, harmless treatment of the hazardous waste can be completed, secondly, reagents used in the treatment process only need phosphoric acid, hydrogen peroxide and sodium hydroxide, ferrous sulfate is not used as a reducing agent, and the method is environmentally friendly. The production of a large amount of iron mud is avoided, and finally, the produced secondary waste can be recycled, so that the aim of turning waste into wealth is fulfilled.

The invention relates to the technical field of environmental pollutant detection, in particular to a method for detecting dichromate based on surface enhanced Raman spectroscopy, which comprises the following steps: preparing a noble metal nano material with the surface modified with a specific recognition ligand as an SERS probe, and enabling the ligand and dichromate ions to generate specific coordination or redox reaction; after a to-be-detected water sample and the SERS probe are mixed and incubated, a surface enhanced Raman spectrum is collected; and qualitative and quantitative detection of dichromate ions in a water sample to be detected is realized by analyzing the intensity change or peak displacement of a specific recognition ligand characteristic peak in a spectrum. According to the method, a signal modulation indirect detection strategy is adopted, a target object is represented by monitoring regular changes of reporter molecule signals, the problems that the affinity of dichromate ions and a substrate is weak and direct detection signals are not sensitive are solved, and the method has the advantages of being high in sensitivity, good in selectivity, high in anti-interference capacity, easy, convenient and rapid to operate and the like; the method is suitable for on-site rapid screening of trace hexavalent chromium in an environmental water body.

This invention provides a column[5]arene-based bicyclic molecule that can detect dichromate ions with high selectivity and high sensitivity through enrichment effect. The column[5]arene-based bicyclic chemical sensor BPN1 was obtained by reacting bis-N-(2-aminoethyl)-2-(hexamyl)acetamide-functionalized column[5]arene with 1,4,5,8-naphthalenetetracarboxylic anhydride in DMF solution. The DMSO-H2O solution of the bicyclic chemical sensor BPN1 showed fluorescence at 455 nm, and the addition of Cr2O7... 2‑ The addition of other ions to the aqueous solution of BPN1 can induce fluorescence quenching, while the fluorescence of BPN1 does not change significantly upon the addition of other ions. Therefore, the dual macrocyclic chemical sensor BPN1 enables the detection of Cr2O7. 2‑ Single-selective recognition. Fluorescent titration experiments showed that this sensor molecularly recognizes Cr2O7. 2‑ It has high sensitivity.

This invention provides a method for detecting dichromate ions based on surface-enhanced Raman spectroscopy, belonging to the field of analytical chemistry. The method includes: mixing the sample to be tested with a solution containing a thiol compound, adjusting to acidic conditions to allow dichromate ions (Cr(VI)) to undergo a redox reaction with the thiol-containing compound; constructing a SERS substrate, i.e., preparing a ZnO / Ag heterostructure substrate; mixing a suspension of the ZnO / Ag heterostructure substrate with the reaction system to obtain a mixed solution, allowing the ZnO / Ag heterostructure substrate to adsorb the thiol-containing compound and enhance the Raman signal; dropping the mixed solution onto the surface of a solid support, acquiring the Raman spectral signal using a Raman spectrometer, and quantifying the Cr(VI) concentration by the change in signal intensity. This invention achieves rapid and highly sensitive detection of Cr(VI), exhibiting strong selectivity and anti-interference capabilities, and is suitable for detection in fields such as environmental monitoring, food safety, and pharmaceutical analysis.

The present invention discloses a method for rapidly detecting dichromate ions in water based on a Zr-MOF fluorescent probe. The Zr-MOF fluorescent probe is synthesized in one step by a solvent thermal synthesis method from 9-oxo-9H-fluorene-2,7-dicarboxylic acid H2FODC and a Zr salt. The aqueous suspension of the Zr-MOF fluorescent probe exhibits green light emission with a peak position of 520 nm under the excitation of 360 nm ultraviolet light. When the analyte dichromate ion (Cr2O7 2‑ ) after the green fluorescence is quenched, achieving fluorescence-off type fluorescence detection with a detection limit as low as 3 nmol / L. The fluorescent probe of the present invention can highly selectively identify Cr2O7 in water. 2‑ ions, and also has the advantages of strong stability, reusability, simple operation and low cost.

The application belongs to the technical field of metal organic coordination compounds, and particularly relates to a copper metal complex fluorescent probe and a preparation method and application thereof. The chemical formula of the copper metal complex fluorescent probe disclosed by the application is [Cu4(Br-BDC)4(4,4'-BMIBP)4·8H2O] n wherein Br-H2BDC=5-bromoisophthalic acid, and 4,4'-BMIBP=4,4'-bis(2-methylimidazolyl)biphenyl. The application can obtain a single crystal form, high-purity crystal material, and is easy to be industrially produced. The product has the function of fluorescent recognition on iron ions and dichromate ions, and can be used for detecting trace iron ions and dichromate ions in an aqueous solution. Compared with a traditional detection method, the method has the advantages of qualitative, rapid, sensitive, efficient, simple operation and the like.