Hyperbranched cellulose crown ether and preparation method thereof

A technology of cellulose and crown ether, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve problems such as heavy metal pollution, and achieve the effect of increasing the load and facilitating adsorption

Inactive Publication Date: 2020-02-14
浙江肯特催化材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sewage containing heavy metals formed by these industries is increasingly discharged into water bodies, causing serious heavy metal pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of hyperbranched cellulose crown ether and preparation method thereof comprises the following steps:

[0021] Step 1: Preparation of Dialdehyde Cellulose:

[0022] Take 250ml of purified water, adjust the pH to 4 with dilute hydrochloric acid, then evenly disperse 5g of cellulose in the purified water, add 5g of potassium periodate in the dark, and stir the reaction at 60°C for 4 hours; after the reaction, filter and collect the precipitate The product was washed with purified water for 3 to 5 times to remove unreacted sodium periodate; finally, the product was freeze-dried to obtain dialdehyde cellulose.

[0023] Step 2: the preparation of hyperbranched cellulose:

[0024] Take 5g of dried dialdehyde cellulose and disperse evenly in 100ml of purified water, then add 2.5g of polyethyleneimine to it, stir to disperse the solution evenly, and heat the reaction in a water bath at 50°C for 3h; the reaction is completed, and the precipitate is separated The material...

Embodiment 2

[0028] The 4-formylbenzo-15-crown-5 used in Example 1 is self-made, and the preparation method is as follows:

[0029] Measure 35 ml of phosphorus oxychloride and 46 ml of N-methylformanilide, add them to the flask, mix and let stand for 20 minutes, then add 50.0 g of benzo-15-crown-5 into the mixed solution, heat to 90 °C, Reacted for 4h to obtain a dark brown mixture. After cooling, the mixture was transferred to a separatory funnel with 600 ml of water, extracted with dichloromethane, distilled under reduced pressure at room temperature with dichloromethane, and the resulting brown oily liquid was dissolved in 150 ml of absolute ethanol, and added to a mixture of 70.0 g of sodium bisulfite, 150 ml of water, 120 ml of ethanol in a mixed solution, heated and stirred until a white precipitate formed.

[0030] The obtained precipitate was transferred to an extract composed of 400 ml of water and 200 ml of chloroform at 0°C, concentrated sulfuric acid was slowly added dropwise ...

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PUM

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Abstract

The invention provides a hyperbranched cellulose crown ether and a preparation method thereof. The preparation method comprises the steps that first, cellulose is oxidized into dialdehyde cellulose; then, aldehyde groups on the dialdehyde cellulose react with polyethyleneimine to prepare hyperbranched cellulose rich in amino; and finally 4-formyl benzo-15-crown ether-5 reacts with the amino of thehyperbranched cellulose to prepare the hyperbranched cellulose crown ether. The hyperbranched cellulose crown ether has the beneficial effects that the hyperbranched cellulose is rich in amino groups, the load of a crown ether active group can be improved, and meanwhile, the hyperbranched crown ether group is further beneficial to the adsorption of heavy metal ions.

Description

technical field [0001] The invention relates to a hyperbranched cellulose crown ether and a preparation method thereof, belonging to the field of adsorption materials, in particular to an adsorption material for heavy metal ions. Background technique [0002] With the rapid development of my country's economy and the rapid advancement of industrialization, such as electroplating, metallurgy, mining, leather, dyes and chemicals, etc., have maintained a momentum of rapid development. Sewage containing heavy metals formed by these industries is increasingly discharged into water bodies, causing serious heavy metal pollution. Heavy metal ions are highly toxic at low concentrations, can accumulate in biological organisms, cause a series of disorders and diseases, and pose a serious threat to the ecological environment and human health. Some data show that through chemical reaction, the introduction of polar functional groups that can bind to heavy metals on the cellulose macromo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/06C08B15/02B01J20/26B01J20/30C02F1/28C02F101/20
CPCB01J20/265C02F1/285C02F2101/20C08B15/02C08B15/06
Inventor 张志明姚慧萍洪钟强华超君杨龙
Owner 浙江肯特催化材料科技有限公司
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