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Preparation method and application of lithium/rubidium ion synchronous absorbent

A technology of rubidium ion and adsorbent, which is applied in the field of preparation of lithium/rubidium ion synchronous adsorbent, can solve the problems such as the difficulty of separating lithium technology and restricting the development of lithium salt industry in salt lake industry, and achieve large adsorption capacity, easy separation, good The effect of stability

Inactive Publication Date: 2017-06-30
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the coexistence of magnesium ions with similar chemical properties makes it difficult to extract and separate lithium from salt lakes, which seriously restricts the development of my country's salt lake industry, especially the lithium salt industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] Preparation of Cellulose Nanocrystals (NCC)

[0036] Prepare cellulose nanocrystals (NCC) by an improved hydrolysis method, weigh 5g of absorbent cotton, place it in 75mL of 1:1 sulfuric acid solution, and react for 2h in a water bath at 45°C; add a large amount of water to terminate the hydrolysis reaction, and let it stand for 12h , Pour off the supernatant, take the lower layer, and centrifuge (control the solution volume to less than 130mL); then adjust the pH to 2.4 by dialysis.

Embodiment 1

[0038](1) Dissolve 211 mg of glucose in 10.5 mL of NCC solution, mechanically stir for 30 min, add 420 μL of TEOS dropwise, and stir for 3 h in a 70°C water bath. After the reaction, it was poured into a polytetrafluoroethylene dish and placed in a water bath at 30°C for 6 days. After taking out the film, it was calcined in a muffle furnace at 560°C for 6 hours to remove NCC and obtain a silicon film.

[0039] (2) Weigh LiCl·H according to the ratio of Li:Mn:Si=1:1:5, 1:1:10, 1:1:25 and 1:1:50 2 O and MnCl 2 4H 2 O, dissolved in 125mL ethanol, made into lithium / manganese ethanol solutions with different concentrations. Take 0.504g of the silicon film and put them in the above lithium / manganese ethanol solutions with different concentrations, vibrate in a water bath for 30h, dry at 90°C, and place them in a muffle furnace at 580°C for calcination for 6h. After the reaction, it was dispersed in 125mL of 0.5mol / L HCl solution, soaked for 26h, filtered, washed with water, dried...

Embodiment 2

[0043] (1) Dissolve 213 mg of glucose in 10.2 mL of NCC solution, stir mechanically for 30 min, add 410 μL of TEOS dropwise, and stir in a water bath at 65°C for 2 h. After the reaction, it was poured into a polytetrafluoroethylene dish and placed in a water bath at 28°C for 6 days. After taking out the film, it was calcined in a muffle furnace at 560°C for 6 hours to remove NCC and obtain a silicon film.

[0044] (2) Weigh LiCl·H according to the ratio of Li:Mn:Si=1:1:5, 1:1:10, 1:1:25, 1:1:50 2 O and MnCl 2 4H 2 O, dissolved in 120mL ethanol, made into lithium / manganese ethanol solutions with different concentrations. Take 0.505g of the silicon film and put them in the above-mentioned lithium / manganese ethanol solutions with different concentrations, vibrate in a water bath for 26h, dry at 85°C, and calcinate in a muffle furnace at 560°C for 5.5h. After the reaction, it was dispersed in 120mL of 0.5mol / L HCl solution, soaked for 25h, filtered, washed with water, dried, an...

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Abstract

The invention belongs to the technical field of material preparation and separation and relates to preparation of lithium / rubidium absorbing materials, particularly to a preparation method and application of a lithium / rubidium ion synchronous absorbent. The preparation method comprises, firstly, synthesizing a silicon film by taking nanocrystalline cellulose (NCC) as a formwork; secondly, through impregnation, supporting a lithium manganese oxide (HMO) ionic sieve on the surface of the silicon film; lastly, performing modification through N-[3-(trimethoxyl silypropyl) ethylenediamine triacetate (TMS-EDTA) to obtain the lithium / rubidium ion synchronous absorbent. According to the preparation method of the lithium / rubidium ion synchronous absorbent, the silicon film synthesized by taking NCC as the formwork is large in specific surface and accordingly can support more functional molecules, improving the absorbing capacity; the obtained lithium / rubidium ion synchronous absorbent is high in stability, easy to separate, and environmentally friendly; serving as an absorbing object, lithium / chloride / rubidium chloride mixed solution is high in absorbing capacity and good in absorptive selectivity. When applied to absorbing and separating lithium / rubidium ions in saline lake and brine, the lithium / rubidium ion synchronous absorbent is simple to operate, high in absorption rate and capable of achieving certain practical values.

Description

technical field [0001] The invention belongs to the technical field of material preparation and separation, and relates to the preparation of lithium / rubidium ion adsorption materials, in particular to a preparation method and application of a lithium / rubidium ion synchronous adsorbent. Background technique [0002] Lithium, as an "energy metal in the 21st century", has a wide range of applications in various industries, especially in the fields of lithium batteries and nuclear fusion, so it is known as an important element that drives the world forward. At present, 80% of the total global production of lithium comes from salt lake brine, and my country also has abundant brine lithium resources in the salt lake areas of Tibet and Qinghai. Among them, the lithium reserves in Qinghai Salt Lake rank first in the country, accounting for more than 90% of the country's proven lithium reserves. Lithium resources in Qinghai Salt Lake are characterized by large reserves and high gra...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F101/10
CPCB01J20/06B01J20/22B01J20/3057C02F1/288C02F2101/10C02F2103/007
Inventor 邱凤仙王媛媛徐雪超郑旭东张涛徐吉成
Owner JIANGSU UNIV
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