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Preparation method and application of lithium-titanium type ion sieve composite membrane

A technology of ion sieve and composite membrane, applied in chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of difficult industrial operation, hindering commercial application, poor fluidity and permeability, etc., to achieve no secondary pollution, cost Low, stable adsorption performance

Inactive Publication Date: 2017-05-10
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lithium-titanium oxide ion sieve is in powder form, and its fluidity and permeability are poor, and it is not easy for industrial operation, which hinders its commercial application.

Method used

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  • Preparation method and application of lithium-titanium type ion sieve composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) TiO 2 and Li 2 CO 3 Add it into absolute ethanol according to the concentration ratio of the substance at 1.00, mix well, put it in a drying oven at 85°C and dry it, then raise the temperature of the product to 850°C at a heating rate of 5°C / min, and keep it for 24 hours. Roasting in the air, the lithium ion sieve LiTiO3 can be obtained. The prepared lithium ion sieve Li 2 TiO 3 In 0.1mol / L HCl solution, magnetically stirred at 60°C to carry out exchange adsorption reaction, take 2.0mL supernatant at regular intervals, and measure Li + concentration, then centrifuged and washed with ethanol several times and placed in an oven to obtain the metatitanic acid-type adsorbent H 2 TiO 3 .

[0022] (2) Preparation of lithium-manganese ion sieve composite membrane: 0.25g lithium ion sieve H 2 TiO 3 The precursor, 1.5g of polyvinylidene fluoride (PVDF) powder, and 0.5g of polyethylene glycol were dissolved in 30mL of N-methylpyrrolidone (NMP) solution, and stirred m...

Embodiment 2

[0024] (1) TiO 2 and Li 2 CO 3 Add it into absolute ethanol according to the concentration ratio of the substance at 1.02, mix well, put it in a drying oven at 85°C and dry it, then raise the temperature of the product to 850°C at a heating rate of 5°C / min, and keep it for 24 hours. Roasting in the air, the lithium ion sieve Li 2 TiO 3 . The prepared lithium ion sieve Li 2 TiO 3 In 0.1mol / L HCl solution, magnetically stirred at 60°C to carry out exchange adsorption reaction, take 2.0mL supernatant at regular intervals, and measure Li + concentration, then centrifuged and washed with ethanol several times and placed in an oven to obtain the metatitanic acid-type adsorbent H 2 TiO 3 .

[0025] (2) Preparation of lithium manganese ion sieve composite membrane: 0.5g lithium ion sieve H 2 TiO 3 The precursor, 3g of polyvinylidene fluoride (PVDF) powder, and 1g of polyethylene glycol were dissolved in 30mL of N-methylpyrrolidone (NMP) solution, and stirred mechanically at...

Embodiment 3

[0028] (1) TiO 2 and Li 2 CO 3Add it into absolute ethanol according to the concentration ratio of the substance at 1.05, mix evenly, put it in a drying oven at 85°C and dry it, then raise the temperature of the product to 850°C at a heating rate of 5°C / min, keep it for 24 hours, and Roasting in the air, the lithium ion sieve Li 2 TiO 3 . The prepared lithium ion sieve Li 2 TiO 3 In 0.1mol / L HCl solution, magnetically stirred at 60°C to carry out exchange adsorption reaction, take 2.0mL supernatant at regular intervals, and measure Li + concentration, then centrifuged and washed with ethanol several times and placed in an oven to obtain the metatitanic acid-type adsorbent H 2 TiO 3 .

[0029] (2) Preparation of lithium-manganese ion sieve composite membrane: 1g lithium ion sieve H 2 TiO 3 The precursor, 6g of polyvinylidene fluoride (PVDF) powder, and 2g of polyethylene glycol were dissolved in 30mL of N-methylpyrrolidone (NMP) solution, and after mixing by mechanic...

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Abstract

The invention provides a preparation method and application of a lithium-titanium type ion sieve composite membrane. The preparation method comprises the following steps: step 1, preparing a lithium ion sieve Li2TiO3 precursor: adding TiO2 and Li2CO3 into absolute ethyl alcohol; after uniformly mixing, drying and baking; washing a baked lithium ion sieve Li2TiO3 with acid, so as to obtain the lithium ion sieve Li2TiO3 precursor; step 2, preparing the lithium-titanium type ion sieve composite membrane: dissolving the lithium ion sieve Li2TiO3 precursor, polyvinylidene fluoride powder and polyethylene glycol into an N-methyl pyrrolidone solution; mechanically stirring and uniformly mixing at constant temperature to prepare a lithium-titanium type ion sieve membrane casting solution; putting the lithium-titanium type ion sieve membrane casting solution into distilled water to obtain the lithium-titanium type ion sieve composite membrane capable of specifically identifying lithium ions. The prepared lithium-titanium type ion sieve composite membrane has good mechanical properties and stable structure and can be used for efficiently and selectively identifying and separating the lithium ions, such as selectively adsorbing and separating the lithium ions from salt lake brine.

Description

technical field [0001] The invention relates to a preparation method and application of a lithium-titanium ion sieve composite membrane, belonging to the technical field of preparation of environmental functional materials. Background technique [0002] Lithium is the alkali metal with the smallest atomic radius and the lightest mass in nature. It is silvery white and has many special physical and chemical properties. Lithium and its compounds are widely used in various fields of the national economy, not only playing an important role in traditional consumer fields such as glass, ceramics, lubricants, etc., but also promoting high-tech fields such as lithium batteries, nuclear energy, aerospace and other fields. Development, known as "new energy in the 21st century", is a strategic material of great significance in national economy and national defense construction. In recent years, as the market demand for lithium continues to grow, the lithium resources on land are far f...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30B01D69/12B01D71/34B01D67/00
CPCB01D67/0002B01D69/12B01D71/34B01D2325/24B01J20/26B01J20/28033
Inventor 崔久云周志平张宇锋谢阿田刘思玮李春香闫永胜
Owner JIANGSU UNIV
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