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Preparation method of bacterial cellulose/polymerized cyclodextrin composite material

A technology of bacterial cellulose and composite materials, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve problems such as limiting the ability to remove pollutants

Active Publication Date: 2020-10-23
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high solubility of cyclodextrins limits their ability to remove pollutants in water bodies

Method used

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  • Preparation method of bacterial cellulose/polymerized cyclodextrin composite material
  • Preparation method of bacterial cellulose/polymerized cyclodextrin composite material
  • Preparation method of bacterial cellulose/polymerized cyclodextrin composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1. Add β-CD (4.34g, 3.82mmol) and 50ml of anhydrous pyridine to a three-necked flask, stir for 1 hour, and cool to 0°C in an ice-water bath. Then TCL (10.86g, 53.56mmol) dissolved in 20ml of anhydrous DMF was added dropwise to the pyridine solution. Subsequently, the reaction was stirred at 70°C for 4 hours. After cooling, 100ml of water was slowly added to the suspension. The filtered product was repeatedly washed with excess water and acetone, and finally the product was dried in a vacuum oven at 100°C for 24 hours to obtain a white solid, which is a polymerized cyclodextrin product.

[0029] Step 2. Take the polymerized cyclodextrin (3.0g, 0.5mmol) and sodium hydride (NaH) (0.3g, 12.5mmol) of step 1 and add them to 100ml of DMF solution. Stir at 25°C for 30min to activate the polymerized cyclodextrin material . Then the product is rotary evaporated to separate the solvent and the product. The obtained white solid is the activated sodium salt of polymeric cyclodex...

Embodiment 2

[0034] Step 1. Add β-CD (4.34g, 3.82mmol) and 50ml of anhydrous pyridine to a three-necked flask, stir for 1 hour, and cool to 0°C in an ice-water bath. Then TCL (6.51g, 32.13mmol) dissolved in 20ml of anhydrous DMF was added dropwise to the pyridine solution. Subsequently, the reaction was stirred at 70°C for 4 hours. After cooling, 100ml of water was slowly added to the suspension. The filtered product was repeatedly washed with excess water and acetone, and finally the product was dried in a vacuum oven at 100°C for 24 hours to obtain a white solid, which is a polymerized cyclodextrin product.

[0035] The subsequent steps are the same as the last three steps in Example 1, and are named BC-CD-2.

[0036] by figure 2 It can be seen that the adsorption capacity of BC-CD-2 material for phenol, aniline and bisphenol A can reach 58.6mg / g, 71.5mg / g and 40.5mg / g respectively. At the same time, it can be seen that the material has faster adsorption kinetics.

[0037] Table 1 Bacterial ...

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Abstract

The invention discloses a preparation method of a bacterial cellulose / polymerized cyclodextrin composite material. The method comprises the following steps: firstly, crosslinking a cyclodextrin monomer through paraphthaloyl chloride to form polymerized cyclodextrin; then activating the polymerized cyclodextrin and sodium hydride in N,N-dimethylformamide to obtain a polymerized cyclodextrin sodiumsalt; and finally, grafting a cyclodextrin polymer to a bacterial cellulose membrane through a silane coupling agent to obtain the bacterial cellulose / polymerized cyclodextrin composite material. Thepreparation method is simple and convenient in process and low in synthesis cost; the prepared bacterial cellulose / polymerized cyclodextrin composite material has a good adsorption effect on organic small molecular pollutants in water; and the membrane material is easy to separate and recycle and can be repeatedly used.

Description

Technical field [0001] The invention belongs to the technical field of the preparation of organic pollutant adsorbents, and relates to a preparation method of a bacterial cellulose / polymerized cyclodextrin composite material, in particular to a method for grafting polymerized cyclodextrin on the surface of a bacterial cellulose material. Background technique [0002] Among the organic pollutants, compared with general organic pollutants and environmental hormones, persistent organic pollutants have higher toxicity, complex structure, low biodegradability and higher stability, and are harmful to the environment. Removal of persistent organic pollutants in water bodies is particularly important. [0003] At present, the methods to treat persistent organic pollutants in water bodies include photocatalysis, advanced oxidation, membrane treatment and adsorption. Among them, the adsorption method has the advantages of simple operation, low energy consumption, high efficiency, etc., and ...

Claims

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Application Information

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IPC IPC(8): B01J20/26C02F1/28B01J20/30C02F101/30
CPCB01J20/26C02F1/285C02F2101/30Y02W10/37
Inventor 钱杰书龚天羿刘飞孙东平
Owner NANJING UNIV OF SCI & TECH
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