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A method for preparing nanocellulose with high-efficiency adsorption of heavy metal ions from natural fallen leaves

A technology for nano-cellulose and heavy metal adsorption, which is applied in the fields of alkali metal compounds, chemical instruments and methods, and adsorption water/sewage treatment. It can solve the problems of low cost and low adsorption efficiency, and achieve cost-saving and high-efficiency adsorption effects.

Active Publication Date: 2019-10-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has low cost and simple operation, but the adsorption efficiency is relatively low (Ma HY et al. Biomacromolecues, 2012, 13, 180-186.)

Method used

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  • A method for preparing nanocellulose with high-efficiency adsorption of heavy metal ions from natural fallen leaves
  • A method for preparing nanocellulose with high-efficiency adsorption of heavy metal ions from natural fallen leaves
  • A method for preparing nanocellulose with high-efficiency adsorption of heavy metal ions from natural fallen leaves

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0035] Example 1: Ginkgo fallen leaves were dried in an oven at 75 degrees Celsius for 3 hours, and ground into powder. Mix 5.0 grams of ginkgo leaf powder, 0.25 grams of TEMPO, and 1.25 grams of sodium bromide in 300 milliliters of water. Add 75 ml (10-15%) sodium hypochlorite aqueous solution, and adjust the pH value of the system to greater than 10 with sodium hydroxide aqueous solution (1M). After stirring at room temperature for 24 hours, the reaction was quenched with a small amount of ethanol. The resulting suspension was centrifuged and washed several times until neutral. The ginkgo leaf nanofiber suspension can be obtained by ultrasonic crushing with a cell pulverizer, and its concentration is determined by a weighing method. The preparation process is as figure 1 shown.

example 2

[0036] Example 2: Observe the above suspension (0.2 wt%) under a polarizing microscope, as shown in figure 2 As shown in (A), it can be seen that the ginkgo leaf nanocellulose is aggregated together and has a certain orientation. Because of its surface carboxylate (1.9 mmol per gram), it can be stained with uranyl acetate solution and observed by TEM ( figure 2 (B)). It can be seen from the figure that the diameter of ginkgo biloba nanocellulose is about 3 to 4 nanometers, and the length is about several hundred nanometers to micrometers.

example 3

[0037] Example 3: ATR technology is used to test ginkgo biloba, ginkgo biloba nanocellulose and wood nanocellulose, such as image 3As shown, it can be seen that the main vibration peak of the infrared spectrum of the ginkgo leaf nanofiber is very similar to that of wood nanocellulose, but it is quite different from the ginkgo leaf raw material, indicating that the main component of the ginkgo leaf nanocellulose is cellulose. The oxidation process removes most of the other components, and at 1621cm -1 The characteristic vibration peak of carboxylate is produced.

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Abstract

The invention relates to a method for preparing nanocellulose for efficiently adsorbing heavy metal ions from natural fallen leaves and a simple method for efficiently adsorbing heavy metal ions or dyes in the polluted water, wherein the nanocellulose fiber with a diameter of 1-100nm and a length-diameter ratio of 10-1,000 is prepared. With rich functional groups on the surface, the nanocellulose can interact with the heavy metal ions or dyes in the polluted water source through complexing or static electricity so as to achieve an aim of adsorbing heavy metal ions or dyes.

Description

technical field [0001] The invention relates to the technical field of preparation of nanocellulose, in particular to one or more kinds of natural fallen leaves, through methods such as aqueous oxidation, hydrolysis, controllable dissolution and mechanical crushing, to finally prepare nanocellulose with a diameter of 1-100 nanometers and an aspect ratio Method for 10-1000 nanocellulose. The surface of the nanocellulose has functional groups such as carboxyl, aldehyde, and hydroxyl groups, which can efficiently adsorb heavy metal ions or dyes in polluted water sources through electrostatic interaction, complexation interaction, and water transfer interaction, thereby achieving the purpose of sewage purification. The present invention provides a new and simple method of effectively utilizing natural wastes to produce high value-added nanomaterials. Background technique [0002] Fallen leaves are one of the natural wastes produced by nature in autumn. Because of their astonish...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C08B15/02C02F1/28C02F101/20C02F101/22C02F101/30
Inventor 马洪洋
Owner BEIJING UNIV OF CHEM TECH