Metal-organic framework UiO-66 adsorbent and modified material thereof

A metal-organic framework and modified material technology, which is applied in the fields of alkali metal compounds, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problem of poor thermal stability and hydrothermal stability of adsorbents, which cannot meet the requirements of industrial use , Inhomogeneous pore structure and other issues, to achieve good thermal stability and hydrothermal stability, good industrial application prospects, and good repeatability

Inactive Publication Date: 2018-10-19
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thermal stability and hydrothermal stability of existing adsorbents are often relatively poor, the pore s

Method used

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  • Metal-organic framework UiO-66 adsorbent and modified material thereof
  • Metal-organic framework UiO-66 adsorbent and modified material thereof
  • Metal-organic framework UiO-66 adsorbent and modified material thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh 0.053g of zirconium chloride and 0.034g of terephthalic acid and dissolve them completely in 5mL of N,N-dimethylformamide solvent; React at 120° C. for 24 hours; wash, filter, and dry the obtained product to obtain a solid Zr-based metal-organic framework adsorbent UiO-66. Its XRD, N 2 Adsorption-desorption, pore size distribution and TEM results are as follows figure 1 , as shown in 2, 3, and 4.

[0038] The dynamic adsorption capacity evaluation of the adsorbent was carried out in a fixed-bed continuous flow differential reactor. The reactor was a glass U-shaped tube with an inner diameter of 4 mm. The loading amount of the adsorbent was 200 mg. The toluene in the final gas was analyzed online by a GC-2060 gas chromatograph equipped with a hydrogen flame detector, and the adsorption amount was calculated by a breakthrough curve. The results of the breakthrough curve are shown in Figure 5 . Tests show that the UiO-66 adsorbent prepared by this method has a r...

Embodiment 2

[0040]Weigh 0.053g zirconium chloride, 0.034g terephthalic acid, weigh a certain amount of CTAB according to the CTAB / Zr molar ratio of 0.1, and dissolve them completely in 5mL N,N-dimethylformamide solvent; transfer the solution React in a stainless steel reaction kettle with a polytetrafluoroethylene liner at 120°C for 24 hours; wash, filter, and dry the obtained product, perform ethanol Soxhlet extraction, and dry to obtain a modified adsorbent. The evaluation method of the adsorbent is the same as in Example 1. Tests show that the UiO-66 adsorbent prepared by this method has a relatively high toluene adsorption capacity at room temperature (25°C).

Embodiment 3

[0042] Weigh 0.053g zirconium chloride, 0.034g terephthalic acid, weigh a certain amount of CTAB according to the CTAB / Zr molar ratio of 0.3, and dissolve them completely in 5mL N,N-dimethylformamide solvent; transfer the solution React in a stainless steel reaction kettle with a polytetrafluoroethylene liner at 120°C for 24 hours; wash, filter, and dry the obtained product, perform ethanol Soxhlet extraction, and dry to obtain a modified adsorbent. The evaluation method of the adsorbent is the same as in Example 1. Tests show that the UiO-66 adsorbent prepared by this method has a relatively high toluene adsorption capacity at room temperature (25°C).

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Abstract

The invention relates to a metal-organic framework UiO-66 adsorbent and a modified material thereof. The adsorbent is prepared by a conventional solvothermal technology. A zirconium source and an organic ligand are mixed, and then are dissolved in a solvent, a solution obtained after the complete dissolving of the zirconium source and the organic ligand is added into a stainless steel reactor witha polytetrafluoroethylene liner, a substance formed after the reaction is washed with an organic solvent and then is filtered, and the obtained solid is dried to obtain the target adsorbent with thepore diameter of 1.4-2.0 nm and the specific surface area of 885-1500 m<2>/g. The modified adsorbent is prepared by a one-step technology by using P123 as a template or CTAB as a surface modifier, andthe obtained product contains the modified UiO-66 with a meso-porous structure or the UiO-66 adsorbent with a functional group. The above adsorbent materials have stable performances, and can be applied to the adsorption of toluene at 298-373 K and the adsorption of toluene in a high humidity atmosphere.

Description

technical field [0001] The invention relates to the field of metal-organic framework adsorption materials, in particular to a metal-organic framework UiO-66 adsorbent and a modified material thereof. Background technique [0002] The use of adsorption for material separation has a long history, and the adsorbent is the key factor to determine the high-efficiency adsorption process. Researchers at home and abroad have done a lot of research work on this. While improving traditional adsorbent products, they are constantly developing new adsorbents. At present, the research on the adsorption of organic gases mainly focuses on compounds such as benzene, toluene, xylene and alkanes. Due to the huge specific surface area and pore volume of MOFs materials, they have ultra-high adsorption capacity for many gases. At present, people are trying to use various MOFs materials to achieve the adsorption of gases. In terms of VOCs adsorption, MOFs materials have great competitive advanta...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/30
CPCB01J20/226B01J20/28064B01J20/28066B01J20/2808B01J20/28083
Inventor 张晓东杨阳宋亮张夏璐吕旭天
Owner UNIV OF SHANGHAI FOR SCI & TECH
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