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Ionic liquid modified magnesium-aluminum lamellar double hydroxide adsorbent as well as preparation and application thereof

A hydroxide and ionic liquid technology, applied in chemical instruments and methods, adsorption of water/sewage treatment, water pollutants, etc., to achieve good reproducibility, good stability, and large adsorption capacity

Inactive Publication Date: 2018-01-09
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the application of ionic liquids on layered double hydroxides for Congo red (CR) dyes in water samples.

Method used

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  • Ionic liquid modified magnesium-aluminum lamellar double hydroxide adsorbent as well as preparation and application thereof
  • Ionic liquid modified magnesium-aluminum lamellar double hydroxide adsorbent as well as preparation and application thereof
  • Ionic liquid modified magnesium-aluminum lamellar double hydroxide adsorbent as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of ionic liquid modified magnesium aluminum layered double hydroxide adsorbent

[0021] (1) Synthesis of magnesium-aluminum layered double hydroxide intercalated with sodium dodecyl sulfate: take an appropriate amount of hydrate powder of magnesium nitrate and aluminum nitrate to prepare an aqueous nitrate solution at a molar ratio of 3:1; dissolve the aqueous nitrate solution slowly Add in the aqueous solution of sodium lauryl sulfate, stir vigorously; Reaction temperature is kept on 70 ℃; The pH value of reaction solution is regulated by 4M NaOH, is stable at 10 ± 0.2; Aging for 4 hours; suction filtration, washing and vacuum drying at 70°C to obtain magnesium-aluminum layered double hydroxide intercalated with sodium dodecyl sulfate;

[0022] (2) Synthesis of mercapto-modified magnesium-aluminum layered double hydroxide: put 0.5 g of magnesium-aluminum layered double hydroxide intercalated with sodium lauryl sulfate into a 250 ml three-necked bottle, add ...

Embodiment 2

[0025] Effect of pH on Adsorption Performance of Ionic Liquid Modified Magnesium Aluminum Layered Double Hydroxide Adsorbent

[0026] Through the static test of solutions with different pH values, the absorbance was measured by ultraviolet spectrophotometry. figure 2 It is the variation of the adsorption rate of Congo red by ionic liquid modified magnesium aluminum layered double hydroxide with the initial pH value of the solution. The initial Congo red concentration: 50 ppm; adsorbent dosage: 5 mg; ultrasonic time: 2 h; temperature: 20°C; sample volume: 10 mL.

Embodiment 3

[0028] Optimization of Adsorbent Dosage

[0029] The amount of adsorbent has a great influence on the adsorption rate of the target substance. In this experiment, the influence of the adsorbent on the adsorption performance of Congo red in the case of 1-15 mg was investigated respectively. The results are as follows: image 3 It can be seen that the adsorption rate increases with the increase of adsorbent dosage. At the initial stage, the adsorption of Congo red by the adsorbent is very fast. With the increase of the amount of adsorbent, the adsorption rate of Congo red increases from 65% to 97%, and then the adsorption speed gradually slows down. Finally, a plateau appears, and the adsorption reaches equilibrium. state. In order to make the adsorption effect better and save the amount of adsorbent, the amount of adsorbent used in the follow-up experiment of Congo red in this experiment is 5 mg.

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Abstract

The invention discloses an ionic liquid modified magnesium-aluminum lamellar double hydroxide adsorbent as well as preparation and application thereof and belongs to the field of an adsorption material preparation technology. According to the ionic liquid modified magnesium-aluminum lamellar double hydroxide adsorbent disclosed by the invention, (3-mercaptopropyl)trimethoxysilane is used as a cross-linking agent and sodium lauryl sulfate intercalated magnesium-aluminum lamellar double hydroxide is used as a carrier; under the cross-linking effect of the (3-mercaptopropyl)trimethoxysilane, 1-allyl-3-methylimidazole chloride salt is loaded on the magnesium-aluminum lamellar double hydroxide to synthesize an adsorption material. According to the ionic liquid modified magnesium-aluminum lamellar double hydroxide adsorbent disclosed by the invention, a lot of ionic liquid is introduced on the magnesium-aluminum linear double hydroxide so that the affinity on organic pollutants is increasedand the adsorption performance of the adsorbent is improved; the adsorbent has the advantages of firmness in bonding and stable property, and can be used in a relatively wide pH (Potential of Hydrogen) range (with the pH of 5 to 10). The adsorbent can be used for adsorbing dyestuffs in an environment water sample.

Description

technical field [0001] The invention belongs to the field of adsorption material preparation technology, and in particular relates to an ionic liquid modified magnesium-aluminum layered double hydroxide adsorbent and its preparation and application. Background technique [0002] With the accelerated development of global modernization, a large amount of industrial wastewater containing toxic azo dyes from textile, tanning, food processing, plastics, cosmetics, rubber, printing and dyeing manufacturing industries, etc. is discharged into the aquatic environment. This will pose a serious danger to human health, organisms and ecosystems. As a sewage treatment method, the adsorption method has been widely used due to its advantages of low cost, high efficiency, simple operation, short time consumption, and the ability to complement each other with other sewage treatment technologies. However, relatively little research has been done on sorbents for non-degradable pollutants. T...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F101/30
Inventor 吕海霞凌云霞飞于岩
Owner FUZHOU UNIV
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