Zinc-aluminum hydrotalcite/carbon nanotube composite adsorption material, preparation method thereof and application in gallium recovery

A carbon nanotube composite and zinc-aluminum hydrotalcite technology, which is applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of easy dispersion and unstable structure of hydrotalcite materials, and achieve good results. Separation and enrichment effect, fast adsorption speed, and large adsorption capacity

Active Publication Date: 2019-11-05
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Hydrotalcite materials have excellent properties such as wide source, radiation resistance, and strong thermal stability, so they are selected as effective adsorbents in the field of metal recovery, but a single hydrotalcite material is easy to disperse and has an unstable structure.
[0006] Based on the above knowledge, there is no report on the absorption of rare earth elements by zinc aluminum hydrotalcite carbon nanotubes.

Method used

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  • Zinc-aluminum hydrotalcite/carbon nanotube composite adsorption material, preparation method thereof and application in gallium recovery
  • Zinc-aluminum hydrotalcite/carbon nanotube composite adsorption material, preparation method thereof and application in gallium recovery
  • Zinc-aluminum hydrotalcite/carbon nanotube composite adsorption material, preparation method thereof and application in gallium recovery

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Experimental program
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Effect test

Embodiment 1

[0034] The preparation of embodiment 1 zinc aluminum hydrotalcite / carbon nanotube composite material

[0035] 1. Preparation of zinc-aluminum hydrotalcite / carbon nanotube composites

[0036] 1) Disperse carbon nanotubes (0.5g) in a 250mL three-necked flask equipped with concentrated nitric acid (20mL) and concentrated sulfuric acid (60mL), the concentration of the concentrated nitric acid is 16mol / L, the concentration of the concentrated sulfuric acid It is 18.4mol / L. Stir ultrasonically for 1.5 h in an ultrasonic water bath at 40°C. After the solution was cooled to room temperature, the above concentrated acid solution was diluted, filtered and washed to obtain carboxylated carbon nanotubes, and dried in an oven at 50°C to obtain an intermediate product, which was named CNT-COOH.

[0037] 2) The dried carboxylated carbon nanotubes (0.40 g), aluminum chloride hexahydrate (0.02 mol, 4.83 g), and zinc chloride (0.06 mol, 8.18 g) were dissolved in 25 mL of water. Slowly add 2m...

Embodiment 2

[0041]Example 2 The adsorption effect of zinc-aluminum hydrotalcite / carbon nanotube composite adsorbent on gallium at different acidities

[0042] Take 10 mg of the Zn / Al-LDH@CNTs composite material prepared in Example 1 and add it to 10 mL of gallium solutions with a concentration of 20 mg / L and a pH of 1, 2, 3, 8, and 10, and then put it into the 180r / min, shake in a shaking box with a temperature of 303K for 24h, filter, take the filtrate and stock solution to measure its concentration, and calculate the adsorption rate.

[0043] Adsorption results such as image 3 As shown, the zinc-aluminum hydrotalcite / carbon nanotube composite adsorbent has the highest adsorption rate of gallium at pH 3, reaching more than 96%. The reason for this phenomenon may be that the hydrogen ions in the phenolic hydroxyl group and the Ga(OH) 2+ and Ga(OH) 2 + Cation exchange occurs, so as to achieve the purpose of adsorbing Ga(Ⅲ), while Ga(OH) 2+ and Ga(OH) 2 + It is the main form at pH 3...

Embodiment 3

[0044] Example 3 The adsorption capacity of zinc-aluminum hydrotalcite / carbon nanotube composite adsorbent to gallium

[0045] Weigh 10 mg of the Zn / Al-LDH@CNTs composite material prepared in Example 1, add it to Ga(III) solutions of different concentrations under the condition of pH 3, shake at a temperature of 303K for 24h, filter, and measure Stock solution and filtrate concentration.

[0046] Isotherms such as Figure 4 shown, from Figure 4 It can be seen from the figure that the adsorption isotherm type is Langmuir type, and the adsorption slope gradually decreases with the increase of concentration until reaching the adsorption equilibrium, which is in line with the characteristics of chemical adsorption. When the pH value of the Ga(III) solution is 3, the maximum adsorption capacity of Ga(III) by the adsorbent Zn / Al-LDH@CNTs is 314.43 mg g -1 .

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Abstract

The invention belongs to the technical field of composite materials, and particularly relates to a zinc-aluminum hydrotalcite carbon nanotube composite adsorption material and a preparation method andapplication thereof. The preparation method comprises the following steps: adding carbon nanotubes into a three-neck round bottom flask filled with concentrated nitric acid and concentrated sulfuricacid, stirring and reacting in an ultrasonic water bath for 1.5h, cooling to room temperature, filtering by suction and washing, and drying to obtain an intermediate product named CNT-COOH; weighing zinc chloride and aluminum chloride hexahydrate in a beaker, adding deionized water, stirring to dissolve, adding the intermediate product obtained in the step 1), slowly dropping a 2 mol L<-1> NaOH solution at a certain speed, adjusting pH to 10, stirring for 2-5 hours, and carrying out hydrothermal reaction to obtain the target product, Zn/Al-LDH @ CNTs. The method has the advantages of low synthesis cost, simple synthesis method, energy conservation, environmental protection, large adsorption capacity, high adsorption speed, wide application and practical applicability.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a zinc-aluminum hydrotalcite / carbon nanotube composite adsorption material and a preparation method and application thereof. Background technique [0002] The distribution of gallium in nature is relatively scattered, and it mainly exists in bauxite and zincite, and there is no ore body that can be independently mined. Therefore, the amount of resources that can be developed and recycled is very small. At present, gallium is mainly recovered from acidic and alkaline immersion solutions such as aluminum smelting and zinc smelting slag, gallium arsenide sludge, red mud, alunite, diode waste products, and fly ash. Gallium is a very valuable element, originally used in the field of metallurgy, and now widely used in various high-tech fields, such as in the field of environmental remediation, using the chemical, thermal and photocatalytic properties of gallium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20C02F1/28C22B3/24C22B58/00C22B59/00B01J20/30C02F101/20
CPCB01J20/205B01J20/08B01J20/06C22B58/00C22B59/00C22B3/24C02F1/283C02F1/281C02F2101/20Y02P10/20
Inventor 熊英孙伟单炜军王月娇娄振宁
Owner LIAONING UNIVERSITY
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