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Polyoxometalate-based metal-organic frameworks crystalline material with nano-cage structure and preparation method and application thereof

An organic framework and base metal technology, which is applied in the field of metal-organic framework crystalline materials, can solve the problems of difficult POMOFs crystalline materials and poor degradation of rhodamine B organic dyes, etc., and achieves easy recovery and multiple use. good effect

Inactive Publication Date: 2016-03-16
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the difficulty of POMOFs crystalline materials with nano-cage structure synthesized in the prior art and the problem of poor degradation effect of rhodamine B organic dyes, and provide a polyacid-based metal-organic framework crystal with a nano-cage structure. State materials and their preparation methods and applications

Method used

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  • Polyoxometalate-based metal-organic frameworks crystalline material with nano-cage structure and preparation method and application thereof
  • Polyoxometalate-based metal-organic frameworks crystalline material with nano-cage structure and preparation method and application thereof
  • Polyoxometalate-based metal-organic frameworks crystalline material with nano-cage structure and preparation method and application thereof

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specific Embodiment approach 1

[0026] Embodiment 1: This embodiment is a polyacid-based metal-organic framework crystalline material with a nano-cage structure, the chemical formula of which is Ag 10 (tta) 4 (H 2 O) 4 (SiW IV 10 W V 2 o 40 ), wherein, tta is tetrazole; crystal system is tetragonal; space group is I-4m2; unit cell parameter is α=90°, β=90°, γ=90°, Z=2.

[0027] The Ag described in this embodiment 10 (tta) 4 (H 2 O) 4 (SiW IV 10 W V 2 o 40 In ), IV represents that the valence of W is +4, and V represents that the valence of W is +5.

[0028] Compared with the prior art, this embodiment has the following characteristics:

[0029] This embodiment adopts simple hydrothermal synthesis technology, and for the first time, a polyacid-based metal-organic framework crystalline material with a nano-cage structure is successfully prepared by using multi-dentate ligands tetrazolium and silicotungstic acid; the results of single crystal X-ray diffraction show that, The polyacid-based met...

specific Embodiment approach 2

[0031] Embodiment 2: This embodiment is a method for preparing a polyacid-based metal-organic framework crystalline material with a nano-cage structure, which is completed in the following steps:

[0032] 1. Prepare a reaction solution with a pH value of 2.5: Dissolve silicotungstic acid, metal silver salt, tetrazolium and mineralizer in distilled water to obtain a reaction solution; adjust the pH value of the reaction solution to 2.5 to obtain a pH value of 2.5 reaction solution;

[0033] The molar ratio of the silicotungstic acid described in step 1 to the metal silver salt is 0.1:(1.0~2.0);

[0034] The molar ratio of silicotungstic acid and tetrazole described in step 1 is 0.1:(0.4~1.0);

[0035] The molar ratio of silicotungstic acid and mineralizer described in step 1 is 0.1:(0.2~0.8);

[0036] The volume ratio of the amount of silicotungstic acid described in step 1 to distilled water is 0.1mmol:(10mL~12mL);

[0037] 2. Add the reaction solution with a pH value of 2....

specific Embodiment approach 3

[0041] Embodiment 3: The difference between this embodiment and Embodiment 2 is that the metal silver salt described in step 1 is silver nitrate, silver acetate or silver sulfate. Others are the same as in the second embodiment.

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Abstract

The invention relates to a metal-organic framework crystalline material with a nano-cage structure, in particular to a polyoxometalate (POM)-based metal-organic frameworks (POMOFs) crystalline material with a nano-cage structure and a preparation method and application thereof and aims to solve the problems in the prior art that a POMOFs crystalline material with a nano-cage structure is high in synthesis difficulty and poor in rhodamine B organic dye degradation effect. The POMOFs crystalline material has the chemical formula of Ag10(tta)4(H2O)4(SiW<IV>10W<V>2O40), the tetragonal system, and the space groups of I-4m2, alpha=90, beta=90, gamma=90 and Z=2. The preparation method comprises the following steps: dissolving silicotungstic acid, silver nitrate, tetrazole and a mineralizer in distilled water; regulating the pH value; carrying out a reaction for 3 days at 160 DEG C. The POMOFs crystalline material with the nano-cage structure can be obtained.

Description

technical field [0001] The invention relates to a metal-organic framework crystalline material with a nanocage structure. Background technique [0002] In recent years, metal-organic framework crystalline materials with nanocage structures have attracted much attention due to their potential applications in the fields of separation, adsorption, and catalysis. The vigorous development of polyoxometalates (POMs) chemistry provides a material basis for novel materials with functional properties. Polyacids are known for their diverse structures and excellent physical and chemical properties. One of the current research hotspots on polyacids in the world is to introduce them into metal-organic frameworks (MOFs) with nanocages to form a series of polyacid-based metal-organic framework crystalline materials (POM-basedMetal- Organic Frameworks, POMOFs). This kind of functional material not only inherits the properties of MOFs materials in terms of separation and adsorption, but a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F19/00B01J31/22A62D3/176B82Y40/00A62D101/26A62D101/28
CPCA62D3/176B82Y40/00C07F1/005C07F11/005B01J31/1815A62D2101/28A62D2101/26B01J35/39
Inventor 马慧媛庞海军张春晶李少斌
Owner HARBIN UNIV OF SCI & TECH
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