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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Problems solved by technology

However, these traditional methods have disadvantages such as high cost,

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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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[0028] Example 1

[0029] A new type of electron-rich system for the synthesis of new dual-interspersed metal-organic framework molecular materials, including ligands and catalysts [Cd(TIPA) (NO 3 ) 2 ]·H 2 The synthesis of O specifically includes the following steps:

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

[0031] For details, please refer to the literature (SZ Luo, XL Mi, L. Zhang, et al. Functionalized chiral ionic liquids as highly efficient asymmetric organocatalysts formichael addition to nitroolefins [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 is 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 a mixture of distilled water and N,N-dimethylformamide DMF in a volume ratio of 2:1), and stir at room temperat...

Example Embodiment

[0047] Example 2: Photocatalysis application experiment

[0048] Photocatalytic reduction of heavy metal ions: choose potassium dichromate (K 2 Cr 2 O 7 ) And potassium permanganate (KMnO 4 ) As a source of Cr(VI) and a source of Mn(VII), the photocatalytic test was carried out under visible light. The specific operation is: disperse 5 mg of compound Cd-TIPA in 5 mL of Cr(VI) or Mn(VII) aqueous solution with an initial concentration of 0.5 mol / L, and then expose the mixed solution to a 10 W white light lamp. After different irradiation times, the solution was removed from the suspension, and the catalyst was removed by centrifugation for analysis. The photocatalytic process of the compound was studied by ultraviolet-visible absorption spectroscopy.

[0049] Photocatalytic properties research

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

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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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