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Multi-level structure calcite, preparation method and application thereof

A calcite and reaction technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of aminohydroxy compounds, etc., to achieve the effects of rich pores, good catalytic performance, and good structural stability

Active Publication Date: 2019-11-15
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the production, use and disposal of nanosilver functionalized commodities will inevitably lead to the release of most of nanosilver into the environment, especially in the water environment.

Method used

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  • Multi-level structure calcite, preparation method and application thereof
  • Multi-level structure calcite, preparation method and application thereof
  • Multi-level structure calcite, preparation method and application thereof

Examples

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preparation example Construction

[0043] The present invention also provides a kind of preparation method of multi-level structure calcite, comprising the following steps:

[0044] a) urea and soluble organic calcium salt are mixed in a solvent, and the mixed system is subjected to reflux reaction under microwave irradiation to obtain a precipitate;

[0045] The number of carbon atoms of the soluble organic calcium salt is less than or equal to 3;

[0046] b) calcining the precipitate to obtain calcite with a hierarchical structure.

[0047] In the preparation method provided by the present invention, firstly, urea and soluble organic calcium salt are mixed in a solvent. Wherein, the number of carbon atoms of the soluble organic calcium salt is less than or equal to 3, preferably less than or equal to 2; the soluble organic calcium salt can be specifically selected from one or more of calcium formate, calcium acetate, calcium propionate and calcium lactate; the The solvent includes but is not limited to ethy...

Embodiment 1

[0064] Preparation of hierarchical calcite:

[0065] A certain amount of urea and calcium acetate were dissolved in 30 mL of ethylene glycol, the calcium ion concentration was 0.1 mol.L, and the urea / calcium ion molar ratio was 1:1; The illumination power was 400W, and the reaction time was 10min to form a white precipitate; after that, the precipitate was centrifuged, washed, and dried, and then calcined in a muffle furnace at 500°C for 3 hours to obtain multi-level calcite.

[0066] The multi-level structure calcite prepared in the present embodiment is detected by X-ray diffraction, and the results are as follows figure 1 shown, figure 1 is the X-ray diffraction spectrum provided in Example 1 of the present invention. pass figure 1 It can be seen that the product prepared in this example is a pure phase of calcite.

[0067] The multi-level structure calcite prepared in the present embodiment is observed by scanning electron microscope, and the results are as follows f...

Embodiment 2

[0072] Nano-silver adsorption recovery experiment

[0073] 1) Preparation of simulated nano-silver wastewater: under magnetic stirring (800 rpm), 5 mL of sodium borohydride (10 g / L) was added to 400 mL of a mixed solution of silver nitrate (0.25 mmol / L) and polyvinylpyrrolidone (0.5 g / L). L) solution, after 12 hours of reaction, the volume was adjusted to 500 mL to obtain. Among them, the concentration of nano-silver is 21.6 mg / L, which can be diluted to obtain nano-silver wastewater with different silver concentrations.

[0074] 2) Adsorption and recovery of nano-silver: Measure a series of 25 mL of simulated wastewater with a nano-silver concentration of 10.8 mg / L in a 50 mL beaker, and adjust the pH to 6.0, 7.0, 8.0, 9.0 and 10.0 with dilute nitric acid and sodium hydroxide solution, respectively. , under the condition of magnetic stirring (400rpm), add 5mg of the hierarchical structure calcite prepared in Example 1, separate the adsorbent by low-speed centrifugation (2100...

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Abstract

Belonging to the field of environmental protection, the invention in particular relates to a multi-level structure calcite, a preparation method and application thereof. The multi-level structure calcite provided by the invention is formed by calcination of the precipitate obtained by microwave reflux reaction of urea and a soluble organic calcium salt in a solvent. The method provided by the invention takes the soluble organic calcium salt and urea as the reactants, and utilizes the microwave reflux-calcination two-step process to prepare the multi-level structure calcite with large specificsurface area and abundant pore channels. The multi-level structure calcite provided by the invention has the characteristics of no toxicity, environmental friendliness, cheap raw materials, and simpleand fast preparation process. The multi-level structure calcite has large adsorption capacity and good structural stability, can show a high adsorption removal rate on nano-silver in a wide pH range,and is not interfered by impurity ions. In addition, the multi-level structure calcite adsorbing nano-silver also has good catalytic performance, and can be used as a catalyst, thus providing a new way for the sustainable application of recovered nano-silver.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a multi-level structure calcite and a preparation method and application thereof. Background technique [0002] Nanosilver has become one of the most used commercial nanomaterials due to its excellent physical, chemical and biological properties. However, the production, use, and disposal of nanosilver-functionalized commodities inevitably lead to the release of most of the nanosilver into the environment, especially the water environment. According to reports, the concentration of nano-silver in the effluent of a river and sewage treatment plant in Malaysia is as high as 10 and 20 mg / L, respectively, which is much higher than the previously predicted environmental concentration. Therefore, the environmental safety of silver nanoparticles has attracted extensive attention. Studies have shown that nano-silver has toxic effects on human body, fish, microorganis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/04B01J20/30C02F1/28B01J23/50C07C213/02C07C215/76C02F101/20
CPCB01J20/04B01J23/50C02F1/281C02F2101/20C07C213/02C07C215/76
Inventor 殷炜姚奇志李涵周根陶
Owner UNIV OF SCI & TECH OF CHINA
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