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Zinc-cobalt Prussian blue analogue adsorbent with hollow structure as well as preparation method and application thereof

A technology of Prussian blue and analogs, applied in the field of zinc-cobalt Prussian blue analog adsorbents and their preparation, can solve the problems of reducing the effective adsorption area, slow diffusion rate of cesium ions, unfavorable mass transfer by pore structure, etc., and achieves increasing effective adsorption. Area, low cost of raw materials, and the effect of improving the adsorption rate

Active Publication Date: 2020-05-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adsorbents of Prussian blue and its analogues still have the problems of small surface area and poor pore structure for mass transfer, and the adsorption performance needs to be further improved.
Although the smaller size of Prussian blue particles has a large specific surface area, the higher surface energy will cause them to easily agglomerate and reduce the effective adsorption area.
However, the larger-sized Prussian blue particles have limited improvement in adsorption performance due to the slower diffusion rate of cesium ions in the interior.

Method used

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  • Zinc-cobalt Prussian blue analogue adsorbent with hollow structure as well as preparation method and application thereof
  • Zinc-cobalt Prussian blue analogue adsorbent with hollow structure as well as preparation method and application thereof
  • Zinc-cobalt Prussian blue analogue adsorbent with hollow structure as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Dissolve 0.72 mmol zinc nitrate hexahydrate and 0.10 g polyvinylpyrrolidone-K30 in deionized water ultrasonically and stir for 0.5 h to obtain solution A; dissolve 0.48 mmol potassium cobalt cyanide in deionized water ultrasonically and stir for 0.5 h to obtain solution B. Pour solution B into solution A slowly and stir for 0.5 h. After standing for 20 h, wash with absolute ethanol, filter with suction, and dry at 80 ℃ to obtain a solid zinc-cobalt Prussian blue analog.

[0033] The prepared 0.08 g solid zinc-cobalt Prussian blue analogue and 0.4 g polyvinylpyrrolidone-K30 (mass ratio 1:5) were mixed and ultrasonically dispersed in deionized water, stirred for 0.5 h, and then 2 M concentrated hydrochloric acid was added to make The concentration of hydrochloric acid in the reaction solution is 1 M, at room temperature (25 o C) Continue to stir for 1 h, let stand for 2 h, then wash with ethanol and filter with suction. o After drying at C, a hollow zinc-cobalt Prussian blue...

Embodiment 2

[0038] The operating conditions are the same as in Example 1, except that the mass ratio of the solid Prussian blue analog sample to the polyvinylpyrrolidone-K30 is 1:10. by Image 6 It can be seen that the prepared Prussian blue analogue still has a hollow spherical morphology.

[0039] It can be seen that, compared with solid Russian blue analogs, hollow-structured Prussian blue analogs increase the specific surface area of ​​the material as a whole, and form a hierarchical pore structure with micropores-mesopores-macropores, which is beneficial to the cesium ion solution. It diffuses quickly and shows a faster adsorption rate.

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Abstract

The invention relates to a zinc-cobalt Prussian blue analogue adsorbent with a hollow structure as well as a preparation method and application thereof. For preparing the zinc-cobalt Prussian blue analogue adsorbent with the hollow structure, solid zinc-cobalt Prussian blue analogue particles are used as precursors, polyvinylpyrrolidone is used as a protective agent and hydrochloric acid is used as an etching agent, so that the zinc-cobalt Prussian blue analogue with the hollow structure is prepared by adopting a chemical etching method. The method adopted by the invention is simple and feasible, the raw material cost is low, and the prepared zinc-cobalt-prussian blue analogue adsorbent with the hollow structure is high in specific surface area, has a micropore-mesopore-macropore hierarchical pore channel structure, and can efficiently and quickly adsorb radioactive cesium ions in wastewater.

Description

Technical field [0001] The invention belongs to the field of adsorbent materials, and in particular relates to a hollow structure zinc-cobalt Prussian blue analog adsorbent and a preparation method and application thereof, and is used for adsorbing the radioactive element cesium in wastewater. Background technique [0002] As one of the alternatives to fossil energy, nuclear energy is undoubtedly a very important energy source. Today, approximately 16% of the world’s electricity is provided by nuclear reactors. However, the leakage of radioactive materials in a nuclear power plant accident can cause serious water pollution problems. In 2011, a nuclear leakage accident occurred at the Fukushima Daiichi Nuclear Power Plant in Japan due to the Great Japan Earthquake and the tsunami caused by it. The total activity of the leaked radioactive material reached 1.5 trillion becquerels. Among them, 137 cesium is the main pollutant of radioactive wastewater with a long half-life (about 3...

Claims

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Application Information

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IPC IPC(8): B01J20/02B01J20/28C02F1/28B01J20/30
CPCB01J20/0229B01J20/0244B01J20/28078C02F1/281C02F2101/006
Inventor 窦美玲柯绍杰郑瑞杰王峰李珏璇
Owner BEIJING UNIV OF CHEM TECH
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