Metal organic framework molecular material of electron-rich system and application thereof in photocatalytic reduction of heavy metal ions

A metal organic framework and heavy metal ion technology, applied in the catalytic reduction of heavy metal ions, especially in the application of Cr and Mn, in the field of new metal organic framework molecular materials, can solve the problems of secondary pollution, high cost, low efficiency, etc., and achieve high efficiency catalytic effect

Active Publication Date: 2020-04-14
HENAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these traditional methods have disadvantages such as high cost, secondary pollution, complicated manufacturing process and low efficiency

Method used

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  • Metal organic framework molecular material of electron-rich system and application thereof in photocatalytic reduction of heavy metal ions
  • Metal organic framework molecular material of electron-rich system and application thereof in photocatalytic reduction of heavy metal ions
  • Metal organic framework molecular material of electron-rich system and application thereof in photocatalytic reduction of heavy metal ions

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Experimental program
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Effect test

Embodiment 1

[0029] Synthesis method of a new type of double interpenetrating metal-organic framework molecular materials with electron-rich systems, including ligands and catalysts [Cd(TIPA) (NO 3 ) 2 ]·H 2 The synthesis of O specifically comprises the following steps:

[0030] 1) Synthesis of ligand tris-(4-imidazolylphenyl)amine (TIPA)

[0031] For details, please refer to the literature (S. Z. Luo, X. L. Mi, L. Zhang, et al. Functionalized chiral ionic liquids as highly efficient asymmetric organocatalysts formichael addition to nitrogens [J]. Angew Chem Int Ed., 2006, 45: 3093-3097.) synthesis.

[0032] 2) Compound [Cd(TIPA) (NO 3 ) 2 ]·H 2 Synthesis of O

[0033] The compound Cd-TIPA was prepared by self-assembly under hydrothermal conditions, specifically: weigh Cd(NO 3 ) 2 ·6H 2 O 42 mg (0.14 mmol), TIPA 23 mg (0.05 mmol) in a mixed solvent (the mixed solvent is composed of distilled water and N,N-dimethylformamide DMF with a volume ratio of 2:1), and stirred at room temper...

Embodiment 2

[0047] Example 2: Photocatalytic application experiment

[0048] Photocatalytic reduction of heavy metal ions: selection of potassium dichromate (K 2 Cr 2 o 7 ) and potassium permanganate (KMnO 4 ) as a Cr(VI) source and a Mn(VII) source for photocatalytic testing under visible light. The specific operation was as follows: 5 mg of the compound Cd-TIPA was dispersed in 5 mL of Cr(VI) or Mn(VII) aqueous solution with an initial concentration of 0.5 mol / L, and then the mixed solution was exposed to a 10 W white light lamp. After different irradiation times, the solutions were removed from the suspension and centrifuged to remove the catalyst for analysis. The photocatalytic process of the compound was studied by UV-Vis absorption spectroscopy.

[0049] Research on Photocatalytic Properties

[0050] At present, the reductive transformation from Cr(VI) to Cr(III) is the most promising method in the treatment of Cr(VI) pollution. Previous studies have shown that the increase ...

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Abstract

The invention relates to a novel metal organic framework molecular material of an electron-rich system. The molecular formula of the metal organic framework molecular material is C27H21CdN9O7, the chemical formula of the metal organic framework molecular material is [Cd(TIPA)(NO3)2].H2O, and the metal organic framework molecular material is called Cd-TIPA (TIPA=tris-(4-imidazolylphenyl) amine) forshort. The compound belongs to a monoclinic system and a C2 space group, and the topological structure is a utp type. The synthesis method specifically comprises the following steps: uniformly mixingCd(NO3)2.6H2O and TIPA in a mixed solvent of distilled water and N,N-dimethyl formamide, then transferring the mixture into a reaction kettle to react for 70-80 hours at 90-100 DEG C, cooling to a room temperature, separating out crystals, washing and drying to obtain Cd-TIPA. The novel metal organic framework molecular material can be used as a photocatalyst for catalytic reduction of heavy metal ions, in particular, Cr (VI) and Mn (VII).

Description

technical field [0001] The invention belongs to the technical field of preparation of metal-organic framework compounds, and in particular relates to a novel metal-organic framework molecular material with an electron-rich system, a synthesis method and its use as a photocatalyst in the catalytic reduction of heavy metal ions, especially Cr(VI) and Mn(VII). Applications. Background technique [0002] In recent years, the rapid development of the chemical industry has led to increasingly serious water pollution, especially the widespread use of heavy metals in electroplating, painting processes, mining, and electronics manufacturing. However, heavy metals are mostly highly toxic and carcinogenic, which poses a great threat to the environment and human health. Among them, hexavalent chromium ion Cr(VI) has been identified as one of the most toxic species in these heavy metal pollutions, and the Environmental Protection Agency stipulates that the content of hexavalent chromium...

Claims

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Application Information

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IPC IPC(8): C08G83/00C02F1/30C02F1/70C02F1/62C02F1/64B01J31/22C02F101/20C02F101/22
CPCB01J31/1691B01J31/1815B01J2531/27C02F1/30C02F1/70C02F2101/206C02F2101/22C02F2305/10C08G83/008
Inventor 韩秋霞陈淑敏马鹏涛牛桂琴司晨
Owner HENAN UNIVERSITY
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