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Flexible MOFs material doped with porous ZIF-8 on surface, preparation method and application

A ZIF-8, surface doping technology, applied in the field of material science and engineering, can solve the problems of complex gas composition, easy corrosion of equipment, waste of resources, etc., and achieve the effect of simple preparation method, good selectivity and good regeneration

Active Publication Date: 2021-06-18
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Contains SO 2 If the flue gas of the gas is directly discharged into the air, it will not only cause environmental pollution, but also cause a waste of resources
On the one hand, although the traditional wet desulfurization technology is mature, the project is large, the equipment is easy to corrode, and the economic benefit of activated carbon desulfurization is low
On the other hand, due to SO 2 Further improvement of emission standards, using traditional methods despite more than 95% SO 2 Can be avoided, but still contains 400ppm SO in some heavy industrial exhaust 2 was discharged
At the same time, the gas composition of industrial emissions is relatively complex, and the presence of other gas components has a significant impact on SO 2 The removal of

Method used

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  • Flexible MOFs material doped with porous ZIF-8 on surface, preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0051] (1) 2.42gCu(NO 3 ) 2 ·3H 2 O was added to 20 mL of deionized water to prepare a metal salt solution. 1.67g of terephthalic acid was added to the prepared Cu(NO 3 ) 2 In the aqueous solution, stir evenly, adjust the pH to 7, transfer to a stainless steel reaction kettle with a polytetrafluoroethylene liner, put it into an oven, raise the temperature to 120°C at a heating rate of 25°C / h, and then react at a constant temperature for 6 hours. After cooling, filter with suction, wash with deionized water three times, and activate at 100°C for 8 hours to obtain Cu-BDC as the inner core.

[0052] (2) Mix the prepared Cu-BDC with 5.95g Zn(NO 3 ) 2 ·6H 2 O was added to 150mL of urea / water solution with a molar ratio of 1:10, stirred continuously at 150°C at a stirring rate of 80r / min, reacted for 1 hour, cooled and filtered, washed with deionized water for 3 times, and dried to obtain A flexible MOFs surface doped with nanoscale Zn(II) salt.

[0053] (3) Add the materia...

Embodiment 2

[0057] (1) 2.42gCu(NO 3 ) 2 ·3H 2 O was added to 20 mL of deionized water to prepare a metal salt solution. 1.67g of terephthalic acid was added to the prepared Cu(NO 3 ) 2 In the aqueous solution, stir evenly, adjust the pH to 7, transfer to a stainless steel reaction kettle with a polytetrafluoroethylene liner, put it into an oven, raise the temperature to 120°C at a heating rate of 25°C / h, and then react at a constant temperature for 6 hours. After cooling, filter with suction, wash with deionized water three times, and activate at 100°C for 8 hours to obtain Cu-BDC as the inner core.

[0058] (2) Combine the prepared Cu-BDC with 7.61g Zn(NO 3 ) 2 ·6H 2 O was added to 200mL of urea / water solution with a molar ratio of 1:10, stirred continuously at 150°C with a stirring rate of 80r / min, reacted for 1 hour, cooled and filtered, washed 3 times with deionized water, and dried to obtain A flexible MOFs surface doped with nanoscale Zn(II) salt.

[0059] (3) Add the mater...

Embodiment 3

[0064] (1) 2.20g Zn(CH 3COO) 2 2H 2 O was added to 20 mL of deionized water to prepare a metal solution. 1.66g of terephthalic acid and 1.67g of 2,5-pyridinedicarboxylic acid were added to the prepared Zn(CH 3 COO) 2 In the solution, stir evenly, adjust the pH to 7, transfer to a stainless steel reaction kettle with a polytetrafluoroethylene liner and put it in an oven, raise the temperature to 120°C at a heating rate of 25°C / h, and then react at a constant temperature for 6 hours. After cooling, filter with suction, wash with deionized water three times, and activate at 100°C for 8 hours to obtain the MOFs material as the inner core.

[0065] (2) Mix the prepared MOFs material with 5.95g Zn(NO 3 ) 2 ·6H 2 O was added to 150 mL of urea / water solution with a molar ratio of 1:10, stirred continuously at 150°C at a stirring rate of 80 r / min, reacted for 1 h, filtered with suction after cooling, washed 3 times with deionized water, and dried to obtain a Flexible MOFs doped...

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Abstract

The invention discloses a flexible MOFs material doped with porous ZIF-8 on the surface, a preparation method and application of the flexible MOFs material, wherein the flexible MOFs material is composed of ZIF-8 and a flexible metal organic framework material MOFs, and is prepared through a hydrothermal synthesis method. The preparation method comprises the following steps: synthesizing a flexible metal organic framework material MOFs through an organic ligand and a metal salt, then doping a nanoscale Zn (II) salt on the surface of the MOFs through constant-temperature heating, finally adding the MOFs into a 2-methylimidazole aqueous solution, and carrying out hydrothermal synthesis activation to obtain the flexible MOFs material with the surface doped with porous ZIF-8. The material is simple in preparation method, has rich pore structures and large adsorption capacity, can selectively adsorb SO2, is good in reproducibility, and is especially suitable for absorbing trace SO2 in flue gas under the medium-temperature condition.

Description

technical field [0001] The invention relates to the field of material science and engineering technology, in particular to a flexible MOFs material whose surface is doped with porous ZIF-8, a preparation method and an application. Background technique [0002] my country is a country that lacks oil and gas and is relatively rich in coal. The unbalanced energy structure leads to the use of coal as the main energy source in my country. The combustion and utilization of coal inevitably cause SO 2 Excessive emissions of gases. SO 2 Gas is one of the main substances that cause atmospheric pollution. Although a series of energy-saving and emission-reduction policies and measures have been proposed, data research shows that China's SO 2 The total emissions are still the highest in the world. Contains SO 2 If the flue gas of the gas is directly discharged into the air, it will not only cause environmental pollution, but also cause a waste of resources. On the one hand, although...

Claims

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Application Information

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IPC IPC(8): C08G83/00B01J20/22B01J20/30B01D53/02
CPCC08G83/008B01J20/226B01D53/02B01D2257/302B01D2258/0283
Inventor 胡江亮潘婷婷王建成刘芳常丽萍鲍卫仁
Owner TAIYUAN UNIV OF TECH
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