POM (polyoxometalate)-based crystal material adopting 3D intercalation structure and preparation method of POM-based crystal material

A technology of crystal materials and layer structures, applied in chemical instruments and methods, hydrogen production, organic compound/hydride/coordination complex catalysts, etc., can solve difficult problems

Active Publication Date: 2018-12-28
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the difficulty of synthesizing multi-acid-based inorganic-organic crystal materials with nanopores using the prior art and few reports of multi-acid-based inorganic-organic hybrid crystal materials with visible light photocatalytic hydrogen production effect , and provide a polyacid-based crystal material with a three-dimensional intercalation structure having the effect of photocatalytically decomposing water to produce hydrogen and a preparation method thereof

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  • POM (polyoxometalate)-based crystal material adopting 3D intercalation structure and preparation method of POM-based crystal material
  • POM (polyoxometalate)-based crystal material adopting 3D intercalation structure and preparation method of POM-based crystal material
  • POM (polyoxometalate)-based crystal material adopting 3D intercalation structure and preparation method of POM-based crystal material

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specific Embodiment approach 1

[0025] Specific implementation mode 1: This implementation mode is a polyacid-based crystal material with a three-dimensional intercalation structure that has the effect of photocatalytically decomposing water to produce hydrogen. The chemical formula is [Cu Ⅱ 5 (2-ptza) 6 (H 2 O) 4 (GeW 12 o 40 )]·4H 2 O, where 2-ptza is 5-(2-pyridine)-tetrazolium; the crystal system is triclinic; the space group is P-1; the unit cell parameters are a=104.873(5), b=111.480(5) , g=105.681(5), a=12.203(5) Å, b=13.495(5) Å, c=14.262(5) Å, z=1.

[0026] The [Cu Ⅱ 5 (2-ptza) 6 (H 2 O) 4 (GeW 12 o 40 )]·4H 2 The valence of Cu in O is +2.

[0027] Compared with the prior art, this embodiment has the following characteristics:

[0028]The present invention adopts a simple one-step hydrothermal synthesis method, and for the first time successfully prepares a three-dimensional intercalation compound with the effect of photocatalytic decomposition of water to produce hydrogen by using 5-...

specific Embodiment approach 2

[0029] Embodiment 2: This embodiment is a method for preparing a polyacid-based metal-organic framework crystal material with nanopores assembled by flexible ligands, which is completed in the following steps:

[0030] 1. Prepare a reaction solution with a pH value of 3.5: Dissolve germanium tungstic acid, copper nitrate, and 5-(2-pyridine)-tetrazolium organic ligands into deionized water to obtain a reaction solution; adjust the pH value of the reaction solution to 3.5, to obtain a pH value of 3.5 reaction solution;

[0031] The molar ratio of germanium tungstic acid to metal copper salt described in step 1 is: 0.1: (0.2-1);

[0032] The molar ratio of the germanium tungstic acid described in step 1 to the tetrazolium-containing organic ligand is: 0.1: (0.2-0.5);

[0033] The volume ratio of the amount of germanium tungstic acid described in step 1 to distilled water is: 0.1mmol: (20ml~35ml);

[0034] 2. Add the reaction solution with a pH value of 3.5 into a polytetrafluor...

specific Embodiment approach 3

[0038] Embodiment 3: The difference between this embodiment and Embodiment 2 is that the metal copper salt described in step 1 is copper sulfate, copper nitrate or copper chloride. Others are the same as in the second embodiment.

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Abstract

The invention relates to a POM (polyoxometalate)-based crystal material adopting a 3D intercalation structure and a preparation method of the POM-based crystal material, in particular to a POM-based crystal material adopting the 3D intercalation structure and having a photocatalytic water splitting hydrogen production effect and aims to solve the problems that most POM-based inorganic-organic hybrid materials synthesized in the prior art have no open pore channels, as a result, guest molecules cannot approach catalytic centers, the catalytic effect is poor, the water splitting hydrogen production effect under irradiation of xenon lamps is not realized and the like. The chemical formula of the designed and developed POM-based crystal material adopting the 3D intercalation structure is [CuII5(2-ptza)6(H2O)4(GeW12O40)].4H2O. The method comprises the steps as follows: tungstic acid, copper nitrate and 5-(2-pyridine)-tetrazole organic ligands are dissolved in deionized water, the pH value is adjusted, and the solution reacts at 120 DEG C for 3 days. The POM-based crystal material adopting the 3D intercalation structure and having the photocatalytic water splitting hydrogen production effect can be obtained.

Description

technical field [0001] The invention discloses a polyacid-based crystal material with a three-dimensional intercalation structure and the effect of photocatalytically decomposing water to produce hydrogen. Background technique [0002] Polyoxometalates (POMs for short) is the abbreviation of polyoxometalates. It is one of the important branches in the field of contemporary inorganic chemistry. Compared with traditional solid acid catalysts, polyoxometalates have higher catalytic activity and catalytic chemical reaction conditions Generally mild, low toxicity, self-stable and other characteristics, it has become a new type of green catalyst and has been widely studied by scholars. Polyacids have excellent redox properties and oxygen-rich atoms, so they have good ability to transfer electrons and Oxygen atoms are well donated in related chemical reactions. At the same time, the variability of its constituent elements and the diversity of its structure allow it to be tailored ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22C08G83/00C01B3/04
CPCC01B3/042C08G83/008B01J31/1691B01J31/1815B01J35/004C01B2203/0277C01B2203/1076Y02E60/36
Inventor 庞海军沈清波马慧媛
Owner HARBIN UNIV OF SCI & TECH
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