33 results about "Dichromate ion" patented technology

The invention discloses an Ag-MOFs metal organic framework material, a synthesis method thereof and application thereof in ion identification. A chemical molecular formula of the metal organic framework material is {[Ag(H2L)]}n, and L is an organic ligand 4-(2,4,6-carboxyl phenyl)-2,2':6',2'- terpyridyl. A proton is removed from one carboxyl, and adjacent silver ions are bridged to form a wave-form 1D chain-shaped structure. A 1D ladder-shaped chain is connected with other 1D ladder-shaped chains through hydrogen bonds, so that a 2D layered structure is further expanded. The material is simpleto prepare, is novel in structure, and is stable in an aqueous solution, and trivalent iron ions and heavy chromium acid radical ions can be quickly detected.

The invention belongs to the field of fluorescence detection materials, and particularly relates to a preparation method of a rare earth terbium-based metal organic framework material and study on the performance of selectively recognizing heavy chromate ions in water. By selecting rare earth terbium emitting green light as metal central ions and selecting p-terphenyl-3,3'',5,5''-tetramethyl acid as organic sensitized ligands, a rare earth porous metal organic framework compound is synthesized under the hydrothermal condition. The compound causes the most obvious fluorescence quenching phenomenon to Cr2O72- anions in different anion solutions, and thus the compound can serve as a novel fluorescence probe for detecting Cr2O72- anions.

The invention belongs to the technical field of applications of fluorescence carbon nano-materials, and concretely relates to a preparation method of carbon quantum dots, and a method for detecting dichromate ions by using the carbon quantum dots. The green preparation of the carbon quantum dots is carried out by using cheap and easily available phosphoric acid or water-soluble phosphate and organic amine as raw materials without a surface passivating agent or other additives in order to prepare the N,P-doped carbon quantum dots having a good water solubility, the carbon quantum dots have uniformly distributed particle sizes, and the average diameter of carbon quantum dot particles is not more than 5 nm. The preparation method has the advantages of cheap raw materials, simplicity and fastness, the selective detection of Cr<2>O<7><2-> is realized by the quantum dots, the detection limit of the quantum dots to Cr<2>O<7><2-> is low, the lowest detection limit can reach 1.2 [mu]M, and highly sensitive detection is achieved. The detection method is not affected by most interference ions (such as Cu<2+>, K<+>, Na<+>, Ca<2+>, Mg<2+>, Co<2+>, Ni<2+>, Ba<2+>, Pb<2+>, Fe<2+>, Zn<2+>, Al<3+>and Fe<3+>, and has a great application prospect.