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Magnesite-chrome bimetallic MOFs adsorbent MIL-101 (Cr, Mg) and preparation method thereof

A bimetallic and adsorbent technology, applied in the field of adsorption materials, can solve the problems of low applicability and poor water stability, and achieve the effects of good repeatability, low production cost and improved adsorption capacity

Active Publication Date: 2015-11-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, MOF-177 although CO 2 The adsorption capacity is large, but its water stability is poor, and its applicability is not high, and MIL-101(Cr) is not only CO 2 The adsorption capacity is large and the stability is high. It is the current stable structure and CO 2 One of the materials with the largest adsorption capacity is considered to be a promising CO 2 Adsorbent

Method used

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  • Magnesite-chrome bimetallic MOFs adsorbent MIL-101 (Cr, Mg) and preparation method thereof
  • Magnesite-chrome bimetallic MOFs adsorbent MIL-101 (Cr, Mg) and preparation method thereof
  • Magnesite-chrome bimetallic MOFs adsorbent MIL-101 (Cr, Mg) and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) Magnesium nitrate hexahydrate (0.5mmol), chromium nitrate nonahydrate (10mmol), terephthalic acid (8mmol), distilled water (45ml), and 40% HF solution (0.3ml) are mixed, then at 40°C Stir and mix for 10 minutes, place the mixture in a reactor and heat to 200°C for 8 hours, then cool to room temperature (25°C);

[0033] (2) the reaction liquid of step (1) is used G 1 Filter through a funnel to remove most of the unreacted ligands, then add 20mlDMF to the filtrate for stirring and washing, then centrifuge with a centrifuge at 8000r / min to obtain a solid substance, and then soak the solid substance with 40ml ethanol and place Heat treatment at 80°C for 10 hours, repeat ethanol soaking and heat treatment twice, after centrifugation, rinse with warm water at 60°C for 3 times, and then centrifuge to obtain green solid particles;

[0034] (3) The obtained solid particles were dried at 80°C for 4 hours, and then activated in vacuum at 120°C for 8 hours to obtain the chromium...

Embodiment 2

[0036] (1) Magnesium nitrate hexahydrate (1mmol), chromium nitrate nonahydrate (10mmol), terephthalic acid (9mmol), distilled water (48ml), and 40% HF solution (0.4ml) are mixed, then stirred at 50°C Mix for 15 minutes, place the mixture in a reaction kettle and heat it to 210°C for 8 hours, then cool to room temperature (25°C);

[0037] (2) the reaction liquid of step (1) is used G 1 Filter through a funnel to remove most of the unreacted ligands, then add 25ml of DMF to the filtrate for stirring and washing, then centrifuge with a centrifuge at 8000r / min to obtain a solid substance, and then soak the solid substance with 50ml of ethanol and place Heat treatment at 80°C for 12 hours, repeat ethanol soaking and heat treatment twice, after centrifugation, wash with warm water at 70°C for 4 times, and then centrifuge to obtain green solid particles;

[0038] (3) The obtained solid particles were dried at 100°C for 5h, and then activated in vacuum at 150°C for 8h to obtain the c...

Embodiment 3

[0040] (1) Magnesium nitrate hexahydrate (2mmol), chromium nitrate nonahydrate (10mmol), terephthalic acid (9.8mmol), distilled water (48ml), and 40% HF solution (0.3ml) are mixed, then at 60°C Stir and mix for 20 minutes, place the mixture in a reactor and heat to 220°C for 9 hours, then cool to room temperature (25°C);

[0041] (2) the reaction liquid of step (1) is used G 1 Filter through a funnel to remove most of the unreacted ligands, then add 25ml of DMF to the filtrate for stirring and washing, then centrifuge with a centrifuge at 8000r / min to obtain a solid substance, and then soak the solid substance with 60ml of ethanol and place Heat treatment at 90°C for 20 hours, repeat ethanol soaking and heat treatment twice, after centrifugation, rinse with warm water at 70°C for 5 times, and then centrifuge to obtain green solid particles;

[0042] (3) The obtained solid particles were dried at 110°C for 6h, and then activated in vacuum at 180°C for 10h to obtain the chromiu...

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Abstract

The invention belongs to the technical field of adsorbing materials, and discloses magnesite-chrome bimetallic MOFs adsorbent MIL-101 (Cr, Mg) and a preparation method thereof. The preparation method comprises the following preparation steps that 1, magnesium nitrate hexahydrate, chromic nitrate nonahydrate, terephthalic acid and hydrogen fluoride solution are added to distilled water, stirring and even mixing are carried out, and a heating reaction is carried out; 2, reaction liquid in the step 1 is filtered, unreacted solid ligand crystals are removed, organic solvent is added to filtrate for agitator treating, centrifugal separation is carried out to obtain sediment, the sediment is soaked in ethyl alcohol and is subjected to heat treatment, flushing is carried out with warm water, and solid particles are obtained; 3, drying and vacuum activation are carried out on the solid particles in the step 2, and MIL-101 (Cr, Mg) is obtained. Magnesium ions are introduced into the adsorbent, so that the adsorption capacity of CO2 is increased, and the adsorptive selectivity of the material to CO2 / N2 is enhanced.

Description

technical field [0001] The invention belongs to the technical field of adsorption materials, and in particular relates to a chromium-magnesium bimetallic MOFs adsorbent MIL-101 (Cr, Mg) and a preparation method thereof. Background technique [0002] With the acceleration of social modernization and the massive consumption of fossil energy, the atmospheric CO 2 The content of carbon dioxide has risen sharply, which has led to a series of environmental problems such as global warming, glacier melting, and seawater acidification. 2 Consensus on emissions. Therefore, for CO 2 Capture and storage has become a major research hotspot at present. [0003] In recent years, a new class of microporous materials—Metal-Organic Frameworks (MOFs), due to their extremely high specific surface area, well-developed pore structure, abundant unsaturated metal sites, and good stability properties, tunable pore size, and surface modification, etc., in CO 2 It has broad application prospects ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30B01D53/02
CPCY02C20/40
Inventor 李忠周珍宇肖静刘江李浩夏启斌
Owner SOUTH CHINA UNIV OF TECH
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