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Prussian blue/graded porous carbon composite adsorbent and preparation method and application thereof

A hierarchical porous, Prussian blue technology, applied in chemical instruments and methods, other chemical processes, alkali metal compounds, etc., can solve the problems of difficult to form highly dispersed particles, limit the application of cesium ion adsorption, fast reaction rate, etc., to achieve adsorption The effect of multiple sites, fast adsorption rate, and simple preparation process

Active Publication Date: 2019-08-06
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Prussian blue usually exists in the form of microcrystals, which has poor solubility in most solvents, and the reaction rate of Prussian blue is fast during the preparation process, making it difficult to form highly dispersed particles, which limits the application of Prussian blue for the adsorption of cesium ions

Method used

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  • Prussian blue/graded porous carbon composite adsorbent and preparation method and application thereof
  • Prussian blue/graded porous carbon composite adsorbent and preparation method and application thereof
  • Prussian blue/graded porous carbon composite adsorbent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 0.2 mmol of ferric chloride and place it in a beaker, add 30 mL of deionized water to dissolve completely by ultrasonic, add 20 mL of 1.6 mmol of oxalic acid solution and 43 mg of graded porous carbon in sequence to make it uniformly dispersed by ultrasonic for 30 min, and stir at room temperature for 7 h Then quickly add 30 mL of 5 mM potassium ferrocyanide solution, continue to stir for 1 h to make the reaction, and then stand for 1 h, and then suction and dry to obtain the Prussian blue / graded porous carbon composite adsorbent, in which the theoretical load of Prussian blue The weight is 100%, and the thermogravimetric calculation shows that the actual load of Prussian blue is 73.4%.

[0033] The Prussian blue / graded porous carbon composite adsorbent obtained above is used for cesium ion adsorption. Take 5 mg of adsorbent in 10 mL of cesium ion solution, shake at room temperature for 12 h, and measure the cesium ion concentration before and after adsorption by ind...

Embodiment 2

[0036] The operating conditions were the same as in Example 1, except that the loading of Prussian Blue was 130%.

[0037] Thus prepared Prussian blue / graded porous carbon adsorbent with a maximum adsorption capacity of 117.92 mg g -1 , The adsorption capacity is 2.5 times that of Prussian Blue. At the same time, the time for adsorption to reach equilibrium is 1 h, which has a faster adsorption rate.

Embodiment 3

[0039] The operating conditions were the same as in Example 1, except that the loading of Prussian Blue was 160%.

[0040] Thus prepared Prussian blue / graded porous carbon adsorbent with a maximum adsorption capacity of 103.19 mg g -1 , The adsorption capacity is 2.3 times that of Prussian Blue. At the same time, the time for adsorption to reach equilibrium is 1 h, which has a faster adsorption rate.

[0041] It can be seen that, compared with the separate graded porous carbon and Prussian blue, the graded porous carbon is used to support Prussian blue compounds. The ultra-high specific surface area, hierarchical pore structure and abundant heteroatoms of the graded porous carbon can greatly improve the Prussian blue. The loading and dispersibility enhance the interaction of Prussian blue-carbon carrier.

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Abstract

The invention relates to a Prussian blue / graded porous carbon composite adsorbent as well as a preparation method and application thereof. The Prussian blue / graded porous carbon composite adsorbent takes biomass-based graded porous carbon as a carrier, and Fe<3+> can be anchored by heteroatoms on the surface of the graded porous carbon, meanwhile Fe<3+> release in ferric chloride is inhibited by oxalic acid, nucleation and growth speed of Prussian blue is further controlled, and finally, Prussian blue microcrystals are grown in situ on the surface of the graded porous carbon to prepare the nano-grade, highly-dispersed Prussian blue / graded porous carbon composite adsorbent. The method provided by the invention has the advantages of simple preparation process, and green and environment-friendly raw materials, and the synthesized adsorbent has a micropore-mesopore-macropore hierarchical pore structure, high specific surface area, uniform dispersion of Prussian blue particles, and capability of efficiently and rapidly adsorbing cesium ions in water.

Description

Technical field [0001] The invention belongs to the field of adsorbent materials, and in particular relates to a Prussian blue / graded porous carbon composite adsorbent and a preparation method and application thereof, which are used for adsorbing the radioactive element cesium in wastewater. Background technique [0002] With the ever-increasing human demand for energy, the nuclear power industry in various countries has developed rapidly, but nuclear power plants will generate a large amount of radioactive waste, which is discharged in the surrounding soil environment, which will pollute the ecological environment and endanger human health. The 2011 Fukushima nuclear power plant leakage accident caused a large amount of radioactive elements to flow into the surrounding water and soil, causing serious impacts on the environment, humans, and food. Among many radioactive elements, 137 cesium has attracted people's attention due to its 30-year half-life, high solubility, high volati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30G21F9/12
CPCB01J20/0229B01J20/0259B01J20/0274B01J20/20B01J20/28085B01J20/28083B01J20/2808B01J20/28066G21F9/12
Inventor 王峰窦美玲李珏璇宋夜
Owner BEIJING UNIV OF CHEM TECH
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