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Vermiculite-based ion screening film and preparation method thereof

A technology of ion sieve and vermiculite, applied in the direction of chemical instruments and methods, membrane, membrane technology, etc., can solve the problems such as limiting the increase of added value, and achieve the effect of simple preparation method, wide applicability, efficient and rapid selective screening

Inactive Publication Date: 2020-07-10
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's vermiculite reserves account for about one-sixth of the world's total. For a long time, it has only been used in traditional fields such as construction and agriculture, which greatly limits the increase in its added value.

Method used

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  • Vermiculite-based ion screening film and preparation method thereof
  • Vermiculite-based ion screening film and preparation method thereof
  • Vermiculite-based ion screening film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1: Mix 0.3g of expanded vermiculite with 100mL of saturated NaCl solution, put it in a high-temperature oven, set the temperature of the oven at 110°C, and heat for 2 hours. After heating, repeat suction filtration with 100mL of deionized water Washing 3 times, 100mL absolute ethanol suction filtration and washing 1 time to obtain powder A;

[0033] Step 2: Mix powder A with 100mL, 2mol / L LiCl solution, put it in a high-temperature oven, set the temperature of the oven at 110°C, and heat for 2 hours. After heating, repeat suction filtration and washing with 100mL deionized water 3 times, 100mL absolute ethanol suction filtration and washing once to obtain powder B;

[0034] Step 3: After mixing the powder B with 80 mL of deionized water, it was stirred and stripped by a high-shear dispersion emulsion homogenizer at a rotation speed of 20,000 rpm, and the stirring and stripping time was 10 minutes to obtain a suspension A;

[0035] Step 4: Remove unstripped vermicu...

Embodiment 2

[0044] The difference between this example and Example 1 is that the volume of saturated NaCl solution mixed with expanded vermiculite in step 1 of this example is 70 mL, and the volume of LiCl solution mixed with powder A in step 2 is 70 mL. The concentration of the vermiculite nanosheet dispersion in the range of 1000-2000 rpm obtained by gradient centrifugation decreased slightly to 5.52 mg / mL. Through experimental measurement, the vermiculite-based ion sieving membrane prepared in the present embodiment has a great influence on Li + 、Na + 、K + 、Cs + , Mg 2+ The permeation rates are 0.453, 0.073, 0.109, 0.287, 0.0384mol h -1 m -2 , basically consistent with Example 1.

Embodiment 3

[0046] The difference between this embodiment and Embodiment 1 is that the oven heating time in steps 1 and 2 of this embodiment is 4 hours. The concentration of the vermiculite nanosheet dispersion in the range of 1000-2000 rpm obtained by gradient centrifugation increased slightly to 6.03 mg / mL. Through experimental measurement, the vermiculite-based ion sieving membrane prepared in the present embodiment has a great influence on Li + 、Na + 、K + 、Cs + , Mg 2+ The permeation rates are 0.470, 0.080, 0.112, 0.293, 0.0404mol h -1 m -2 , basically consistent with Example 1.

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Abstract

The invention belongs to the technical field of film preparation and separation and purification, and discloses a vermiculite-based ion screening film and a preparation method thereof. The preparationmethod comprises the following steps: 1, mixing expanded vermiculite and a saturated NaCl solution, heating at high temperature, performing suction filtration and washed, and preparing powder A; 2, mixing the powder A with a LiCl solution, heating at high temperature, and performing suction filtration and washing to obtain powder B; 3, mixing the powder B with deionized water, stirring and stripping to obtain a turbid liquid C; 4, carrying out low-speed centrifugation on the turbid liquid C, and then carrying out gradient centrifugation so as to prepare nanosheet dispersion liquid under different rotating speed ranges; and 5, stacking the nanosheet dispersion liquid on the surface of a porous substrate, and drying to obtain the vermiculite-based ion screening film. The film has quicker and more efficient selective screening capability on monovalent / multivalent metal ions; the method is simple, low in cost, free of acid and alkali, wide in applicability and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of membrane preparation and separation and purification, and in particular relates to a vermiculite-based ion sieving membrane and a preparation method thereof. Background technique [0002] Monovalent metal ions are closely related to human life, especially in industrial applications, and are an important resource. For example, Na + Used as a coolant in some nuclear reactors, K + Can be used to produce fertilizers, Li + Can be used to make lithium batteries. Monovalent metal ions are widely distributed in seawater, brine and brine in nature, but also contain a large number of multivalent metal ions, such as alkaline earth metal ions Mg 2+ and Ca 2+ . Therefore, how to obtain high-purity single ions and their salts under the condition of coexistence of multiple metal ions is a significant challenge, especially in China, a country with increasing metal consumption. [0003] Membrane technology can scre...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D67/00B01D69/02B01D71/02B01D71/12B01D71/26
CPCB01D71/027B01D69/02B01D67/0079B01D61/027B01D71/025B01D71/12B01D71/26B01D2325/14
Inventor 宋永臣凌铮邓豪柴丰圆石常瑞周航赵佳飞杨磊李洋辉
Owner DALIAN UNIV OF TECH
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