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Modified organic metal framework used for efficiently adsorbing elemental mercury in flue gas

An organometallic and elemental mercury technology, applied in the field of environmental adsorption materials, can solve problems such as soil pollution and achieve good application prospects

Inactive Publication Date: 2016-02-03
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Studies have shown that more than 80% of the bromine will be leached out when the used liquid bromine modified activated carbon adsorbent is landfilled, causing subsequent soil pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A modified organometallic framework for efficient adsorption of elemental mercury in flue gas, with a chemical formula of Zr 6 o 4 (OH) 4 [C 6 h 2 Cl 2 (CO 2 ) 2 ] 6 ; Its preparation method step is as follows:

[0019] 1) Add 48 mg of zirconium tetrachloride to 8 mL of N,N-dimethylformamide (DMF), ultrasonically shake for 15 minutes to fully dissolve it, then add organic ligands 2,5-dichloroterephthalic acid, tetrachloro The molar ratio of zirconium chloride to 2,5-dichloroterephthalic acid is 1:1, then add formic acid as an acid template, the molar ratio of formic acid to zirconium tetrachloride is 1:10, and the solution after fully mixing Pour it into a 200mL tetrafluoroethylene-lined high-pressure reactor, seal it, and place it in a constant temperature oven at 120°C for 30 hours of constant temperature reaction. After the reaction, pour out the solution in the kettle, and vacuum filter to obtain a white solid powder;

[0020] 2) Disperse 120 mg of the abov...

Embodiment 2

[0023] A modified organometallic framework for efficient adsorption of elemental mercury in flue gas, with a chemical formula of Zr 6 o 4 (OH) 4 [C 6 h 3 Cl(CO 2 ) 2 ] 6 . The preparation steps are basically the same as in Example 1, except that the organic ligand in step 1) is 1-chlorotere-dibenzoic acid.

[0024] The adsorption material has a mercury removal efficiency of 90% at 120°C.

Embodiment 3

[0026] A modified organometallic framework for efficient adsorption of elemental mercury in flue gas, with a chemical formula of Zr 6 o 4 (OH) 4 [C 6 h 2 Br 2 (CO 2 ) 2 ] 6 . The preparation steps are basically the same as in Example 1, except that the organic ligand in step 1) is 2-bromoterephthalic acid.

[0027] The adsorption material has a mercury removal efficiency of 95% at 180°C.

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Abstract

The chemical formula of a modified organic metal framework used for efficiently adsorbing elemental mercury in flue gas is Zr6O4(OH)4[C6H2M2(CO2)2]6 or Zr6O4(OH)4[C6H3M(CO2)2]6, wherein M is Br or Cl or I. A preparation method includes the steps that zirconium tetrachloride serves as an MOF metal center, terephthalic acid series ligands provided with a mercury affine substituent group serve as active organic ligands, and a mercury affine active MOF series is synthesized; the modified organic metal framework can be used for efficiently removing elemental mercury in the flue gas. The modified organic metal framework has the advantages that 2-chlorine terephthalic acid with mercury affine functional group and the other three organic ligands are adopted for synthesizing an active MOP series, a mercury static adsorption experiment represents that the demercuration efficiency of active MOF elemental mercury is larger than 90%. By means of the modified organic metal framework, the efficient and high-amount elementary mercury adsorption characteristic is given, and the modified organic metal framework is a flue gas demercuration adsorption material with good application prospects.

Description

technical field [0001] The invention belongs to the technical field of environmental adsorption materials, and in particular relates to a modified organic metal framework for efficiently adsorbing elemental mercury in flue gas. Background technique [0002] Mercury is one of the most toxic heavy metal pollutants in the environment, and has pollution characteristics such as persistence, long-distance migration, and bioaccumulation. Mercury in the environment enters organisms, accumulates in organisms to produce toxicity, and passes and accumulates along the food chain. Different forms of mercury have varying degrees of toxic effects on the kidneys, brain, nerves, and embryos of the human body. [0003] Mercury emissions from human production activities are an important source of mercury pollution in the environment. Although the mercury content in coal is low, the long-term large-scale coal combustion activities make coal-fired boilers the largest source of anthropogenic me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/00B01J20/22B01D53/02
Inventor 沈伯雄张笑梅雪
Owner HEBEI UNIV OF TECH
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