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Preparation method for MOFs heavy metal collecting agent

A heavy metal trapping agent and metal salt technology, which is applied in chemical instruments and methods, water/sludge/sewage treatment, adsorption water/sewage treatment, etc., can solve the problems of difficult recycling of heavy metals, difficult regeneration of adsorbents, and small adsorption capacity etc. to achieve excellent adsorption capacity, stable properties, and reduced dosage

Active Publication Date: 2017-01-04
张少强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of solid heavy metal trapping agent based on MOFs containing mercapto groups with HKUST structure, aiming at the shortcomings of the current heavy metal trapping agent, such as small adsorption capacity, difficulty in recycling the adsorbed heavy metals, and difficulty in regeneration of the adsorbent. Preparation

Method used

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  • Preparation method for MOFs heavy metal collecting agent
  • Preparation method for MOFs heavy metal collecting agent
  • Preparation method for MOFs heavy metal collecting agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 1 part of trimerbenzoic acid (BTC), 1.5 parts of zinc nitrate and 5 parts of dimethylformamide (DMF) and mix them to fully dissolve them. Then add 0.6 parts of sodium thiocyanate, continue to stir and dissolve. Move the above mixture into a stainless steel high-pressure hydrothermal reaction kettle, and control the temperature rise rate to 10-15°C / min; when the temperature rises to 150°C, stop the temperature rise, and keep warm at this temperature for 2 hours. After the reaction, the temperature was naturally lowered to below 80°C, and the materials in the reactor were taken out, washed with pure water for more than 3 times, dried at 100°C, and then activated at 210°C, ready for use after activation.

[0032] Put 0.2g of mercapto-containing MOFs prepared above into a copper sulfate solution containing 25ppm. After shaking for 10 minutes, the typical blue color of copper sulfate can be seen to disappear. After ICP-MS detection, Cu 2+ The concentration is lower tha...

Embodiment 2

[0035] Take 1 part of trimerbenzoic acid (BTC), 1.5 parts of zinc nitrate and 5 parts of dimethylformamide (DMF) and mix them to fully dissolve them. Then add 0.3 part of sodium thiocyanate, continue to stir and dissolve. Move the above mixture into a stainless steel high-pressure hydrothermal reaction kettle, and control the temperature rise rate to 10-15°C / min; when the temperature rises to 150°C, stop the temperature rise, and keep warm at this temperature for 2 hours. After the reaction, the temperature was naturally lowered to below 80°C, and the materials in the reactor were taken out, washed with pure water for more than 3 times, dried at 100°C, and then activated at 210°C, ready for use after activation.

[0036] Put 0.2g of mercapto-containing MOFs prepared above into a copper sulfate solution containing 25ppm. After shaking for 10 minutes, the typical blue color of copper sulfate can be seen to disappear. After ICP-MS detection, Cu 2+ The concentration is lower than...

Embodiment 3

[0038]Take 1 part of trimerbenzoic acid (BTC), 1.8 parts of zinc nitrate and 5 parts of dimethylformamide (DMF) and mix them to fully dissolve them. Then add 0.4 part of sodium thiocyanate, continue to stir and dissolve. Move the above mixture into a stainless steel high-pressure hydrothermal reaction kettle, and control the temperature rise rate to 10-15°C / min; when the temperature rises to 150°C, stop the temperature rise, and keep warm at this temperature for 2 hours. After the reaction, the temperature was naturally lowered to below 80°C, and the materials in the reactor were taken out, washed with pure water for more than 3 times, dried at 100°C, and then activated at 210°C, ready for use after activation.

[0039] Put 0.2g of mercapto-containing MOFs prepared above into a copper sulfate solution containing 25ppm. After shaking for 10 minutes, the typical blue color of copper sulfate can be seen to disappear. After ICP-MS detection, Cu 2+ The concentration is lower than ...

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Abstract

The invention discloses a preparation method for a MOFs heavy metal collecting agent. The method comprises the following steps: taking dimethyl formamide as a deprotonation alkaline solvent, macromolecule metal salt containing sulfydryl structure as a dopant and zinc nitrate and mesitylenecarboxylic acid as precursors, and then compounding by adopting a solvothermal method. The zinc-based MOFs prepared according to the method has a single mesoporous and micropore crystal structure; the mass transfer resistance is overcome in the reaction process; the mass transfer efficiency is improved; the prepared heavy metal collecting agent is a solid adsorbent and is easy to collect and regenerate; the leaching toxicity is low; the adsorption efficiency is high; the reutilization is realized.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a preparation method of a heavy metal trapping agent based on MOFs. Background technique [0002] Metal Organic Frameworks (MOFs) are a new class of porous materials that have developed rapidly in the past decade. They have the advantages of high porosity, high adsorption capacity, adjustable pore size, diverse structures, and good stability. [0003] In 2001, Yaghi et al. used Zn ions and terephthalic acid to synthesize MOF-5. The synthesis of this material marked the maturity of the development of MOFs materials. Due to the super large specific surface area, super high pore volume, and stable structure of MOFs materials, their research results have been continuously published in the authoritative top magazine "Science". Taking MOF-5 as an example, its pore volume reaches 0.61cm 3 / cm 3 , the specific surface area reaches 2296m 2 / g. The structure of the ...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F1/62
Inventor 张少强
Owner 张少强
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