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Lithium ion sieve membrane and preparation method thereof

A lithium ion and sieve membrane technology, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve the problems of difficulty in industrial application, cumbersome process, poor particle fluidity and permeability, etc. Achieve the effect of good application prospect, convenient use and simple preparation process

Inactive Publication Date: 2011-10-12
OCEAN UNIV OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the synthesized lithium ion sieve is mostly in powder state, the particles are small, and the fluidity and permeability of the particles are poor, it is not suitable for column operation, and it is mostly used for static adsorption. After the adsorption, the solid-liquid separation operation must be completed. It is cumbersome; and it is easy to cause product loss in the process of use and transfer, so industrial application is very difficult, etc.

Method used

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  • Lithium ion sieve membrane and preparation method thereof
  • Lithium ion sieve membrane and preparation method thereof
  • Lithium ion sieve membrane and preparation method thereof

Examples

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Effect test

Embodiment 1

[0018] Dissolve a certain amount of PVDF in DMAc to make a casting solution with a mass percentage of 16%, and then add Li 1.6 mn 1.6 o 4 , After mixing, heat and stir at 60°C. Then ultrasonic for a period of time to make the precursor 1.6 mn 1.6 o 4 Fully disperse in the casting solution, let it stand for one day at room temperature to make it mature and defoam completely, scrape a layer of liquid film with a thickness of 0.2 mm on a clean glass plate, and immerse the liquid film together with the glass plate in a coagulation bath (distilled water), The film cures and peels off the glass plate automatically.

[0019] The prepared film was placed in 0.5mol / L HCl for 12 hours, and the precursor Li 1.6 mn 1.6 o 4 After the lithium ions are extracted, the lithium ion sieve membrane is obtained. Such as figure 1 As shown, the scanning electron micrographs showed that the Li-ion sieve was successfully incorporated into the membrane.

Embodiment 2

[0021] Place the lithium ion sieve membrane prepared in Example 1 in the LiCl / LiOH solution with a lithium ion concentration of 0.753 mg / L, take the last clear liquid every half an hour, and measure the Li before and after the solution with an atomic absorption spectrophotometer. + Concentration, according to the formula to calculate the adsorption capacity. The lithium ion sieve membrane has a relatively high adsorption capacity for lithium, and the adsorption rate is fast, and the adsorption equilibrium is reached in about 8 hours, and the adsorption capacity for lithium ions is as high as 27.45×10 2 mg / cm 2 ,Such as figure 2 shown.

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Abstract

The invention discloses a lithium ion sieve membrane and a preparation method thereof. The preparation method of the lithium ion sieve membrane is characterized by comprising the following steps of: dissolving polyvinylidene fluoride in N,N-dimethyl acetamide to prepare membrane casting liquid, and then adding lithium manganese oxide precursors; after mixing, heating and agitating; fully dispersing the lithium manganese oxide in the membrane casting liquid through ultrasound, standing, curing, fully defoaming, scraping a clean glass plate into a membrane, and immersing the membrane in a coagulation bath for coagulating; and finally acid-washing the made membrane, and extracting lithium ions in the precursors to obtain the lithium ion sieve membrane. The invention has the advantages of simple preparation process and convenience for use and has good application prospects in seawater lithium extraction.

Description

technical field [0001] The invention relates to an adsorbent and a preparation method thereof, in particular to a lithium ion sieve membrane and a preparation method thereof. Background technique [0002] Lithium and its salts are widely used in glass, ceramics, lubricants, refrigerants, metallurgy, pharmaceuticals, chemical reagents, lithium-ion batteries and energy due to their unique advantages. However, the content of lithium resources on land is about 1.7×10 7 tons, which is far from meeting the market's demand for lithium, and the reserves of lithium resources in seawater are huge, more than 15,000 times that of land, about 2.5×10 11 Ton. Therefore, extracting lithium from seawater has broad development prospects. [0003] Adsorbent method is considered to be the most promising method for extracting lithium from seawater with low lithium concentration and salt lake brine because of its good selectivity, high extraction rate and easy continuous operation. At presen...

Claims

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Application Information

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IPC IPC(8): B01J20/06B01J20/04B01J20/28B01J20/30
Inventor 朱桂茹綦鹏飞王铎高从堦
Owner OCEAN UNIV OF CHINA
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