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Ionic liquid modified crosslinked porous chitosan adsorbent and preparation method and application thereof

A technology of porous chitosan and ionic liquid, applied in the direction of adsorption of water/sewage treatment, other chemical processes, chemical instruments and methods, etc., to achieve good stability, large adsorption capacity, and improved adsorption capacity

Active Publication Date: 2017-12-29
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no report on the application of sunset yellow (SY) dyes in water samples by grafting ionic liquids on cross-linked porous chitosan

Method used

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  • Ionic liquid modified crosslinked porous chitosan adsorbent and preparation method and application thereof
  • Ionic liquid modified crosslinked porous chitosan adsorbent and preparation method and application thereof
  • Ionic liquid modified crosslinked porous chitosan adsorbent and preparation method and application thereof

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Effect test

Embodiment 1

[0020] Preparation of Ionic Liquid Modified Crosslinked Porous Chitosan Adsorbent

[0021] (1) Synthesis of cross-linked porous chitosan: Dissolve 5 g of chitosan (CS) with 143 mL of acetic acid solution with a volume fraction of 1% by stirring and dissolving. After the chitosan is completely dissolved and rested until the air bubbles completely escape, a uniform shell can be obtained. Polysaccharide solution; Slowly add the prepared chitosan solution drop by drop into 10% sodium hydroxide solution with a 0.5 mL plastic dropper, stir magnetically at low speed for 3 h after the addition, and use Wash with deionized water until neutral, store in deionized water to obtain porous chitosan spheres (CB); the preparation of cross-linked porous chitosan (CCB) is to add 100 mL of chitosan spheres (CB) to 100 mL of deionized water and 2 mL of glutaraldehyde solution (GLA) with a volume fraction of 50% were stirred magnetically at 25 °C for 45 min; then washed several times with ethanol ...

Embodiment 2

[0024] Effect of pH on Adsorption Properties of Ionic Liquid Modified Crosslinked Porous Chitosan Adsorbent

[0025] Through the static test of solutions with different pH values, the adsorption capacity was measured by ultraviolet spectrophotometry. figure 2 It is the variation of the adsorption capacity of ionic liquid modified cross-linked porous chitosan for adsorption of sunset yellow with the initial pH value of the solution. The initial sunset yellow concentration: 50 ppm; adsorbent dosage: 5 mg; adsorption time: 3 h; temperature: 25°C; sample volume: 10 mL.

Embodiment 3

[0027] Optimization of adsorption time

[0028] Stirring time is of great significance to improve the adsorption efficiency. In this experiment, the influence of the adsorbent on the adsorption performance of sunset yellow in the case of 10-120 min was investigated, and the results are as follows: image 3 As shown, the adsorption capacity increased with the increase of adsorption time. In the initial stage, the adsorption of sunset yellow by the adsorbent was very fast. With the increase of adsorption time, the adsorption capacity of sunset yellow increased rapidly, and then the adsorption speed gradually slowed down. Finally, a plateau appeared, and the adsorption reached an equilibrium state at this time. In order to make the adsorption effect better and save the adsorption time, the adsorption time for the follow-up experiment of sunset yellow in this experiment was 60 min.

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Abstract

The invention discloses an ionic liquid modified crosslinked porous chitosan adsorbent and a preparation method and application thereof and belongs to the field of preparation processes of adsorbent materials. The preparation method includes: 1), synthesis of crosslinked porous chitosan; 2), synthesis of the ionic liquid modified crosslinked porous chitosan adsorbent. The ionic liquid modified crosslinked porous chitosan adsorbent is characterized in that glutaraldehyde is taken as a crosslinking agent and the chitosan is taken as a carrier to prepare the crosslinked porous chitosan adsorbent, and 1-allyl-3-methimidazole chloride is grafted on the a crosslinked porous chitosan ball to prepare the ionic liquid modified crosslinked porous chitosan adsorbent material. Massive ionic liquid is led to the crosslinked porous chitosan, affinity on organ pollutants is increased, adsorption performance of the adsorbent is improved, firm linking and stable performance are achieved, and the adsorbent can be used in a wide range of pH values; the adsorbent is applicable to adsorption of dye of environmental water samples.

Description

technical field [0001] The invention belongs to the field of adsorption material preparation technology, and in particular relates to an ionic liquid modified cross-linked porous chitosan adsorbent and its preparation and application. Background technique [0002] Synthetic dyes are widely used in many industries such as textile, leather, paper, paint, cosmetics and food. Among them, the amount of azo dyes accounts for more than 70% of all commercial dyes. If these dyes are discharged into the environment without purification treatment, they will not only pollute the color of the water body, but also bring toxicity, mutagenicity and even carcinogenicity to organisms. Therefore, there is an urgent need to develop an efficient method for the removal of dye pollutants in water environments. 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 co...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/38C02F101/34C02F101/30
Inventor 吕海霞凌云霞飞于岩
Owner FUZHOU UNIV
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