A bacterial cellulose membrane/nanometer iron composite material and its preparation method and application

A technology of bacterial cellulose membrane and composite materials, applied in the field of bacterial cellulose/nano-iron composite materials and its preparation, can solve the problems of decreased activity and easy agglomeration, so as to improve the removal capacity, protect the water environment, and save fresh water resources Effect

Active Publication Date: 2021-01-05
RENMIN UNIVERSITY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its nanostructure, it is prone to agglomeration, resulting in a decrease in its activity

Method used

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  • A bacterial cellulose membrane/nanometer iron composite material and its preparation method and application
  • A bacterial cellulose membrane/nanometer iron composite material and its preparation method and application
  • A bacterial cellulose membrane/nanometer iron composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1, preparation bacterial cellulose film / nanometer iron composite material

[0038] 1) First cut the bacterial cellulose membrane into a disc with a diameter of about 3 cm, place the obtained disc in 100 ml of sodium hydroxide solution with a mass concentration of 20 g / L and activate it for 12 hours to obtain activated-bacteria Cellulose film.

[0039] 2) Place the activated-bacterial cellulose membrane in a beaker containing 100 milliliters of ethanol / water solution with a volume ratio of 7 / 3, control the stirring speed to 15 rpm, and continue stirring for 1 hour; then take out the membrane and absorb it with filter paper After drying, put it into 100% ethanol again and continue stirring and extracting for 1 hour, and then dry it with filter paper again to obtain a semi-dehydrated-activated-bacterial cellulose membrane.

[0040] 3) Place the prepared semi-dehydration-activated-bacterial cellulose membrane in a four-necked flask, and add 100 milliliters of 0....

Embodiment 2

[0041] Example 2: Bacterial cellulose membrane / nanometer iron composite material removes diclofenac sodium in water

[0042] The selected model pollutant is diclofenac sodium with the following structural formula:

[0043]

[0044] Accurately measure 50 milliliters of diclofenac sodium solution with a concentration of 20 mg / L in a glass bottle, set the temperature at 20° C., and then place the bacterial cellulose membrane / nano-iron composite material prepared in Example 1 in the above solution as an experimental group (BCM / Fe 0 ). In addition, accurately measure 50 ml of diclofenac sodium solution with a concentration of 20 mg / L in a glass bottle, set the temperature at 20°C, and then place a pure bacterial cellulose film of the same specification in the above solution as a blank control group (Blank) .

[0045]Sampling was carried out at 10,20,30,60min respectively, and the concentration of diclofenac sodium was measured by high performance liquid chromatography (HPLC),...

Embodiment 3

[0047] Example 3: Bacterial cellulose membrane / nanometer iron composite material removes virus MS2 in water

[0048] The selected model virus is MS2 phage, and its capsid structure is as follows: image 3 shown.

[0049] The bacterial cellulose membrane / nanometer iron composite material that adopts embodiment 1 to prepare is to MS The initial concentration is 10 6 The pfu / mL solution was used for the removal experiment, and the pure bacterial cellulose membrane of the same specification was used as the blank control (Blank), and the results were as follows Figure 4 shown.

[0050] Depend on Figure 4 It can be seen that with the increase of reaction time, BCM / Fe 0 The removal of MS2 gradually increased, and after 4 hours of reaction, the MS2 in the water was basically completely removed, and the effect was good. But pure bacterial cellulose membrane has no removal effect on MS2.

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Abstract

The invention discloses a bacterial cellulose film / nano-iron composite material and a preparation method thereof. The preparation method of the bacterial cellulose film / nano-iron composite material comprises the following steps of: (1) putting bacterial cellulose film in an alkaline solution for activation to obtain activated bacterial cellulose film; (2) performing extraction on the activated bacterial cellulose film by using a polar-alcohol aqueous solution so as to remove free water / bound water on the surface and interior of the film and therefore obtain semi-dehydrated activated bacterialcellulose film; and (3) putting the semi-dehydrated activated bacterial cellulose film in a ferrous ion solution, and performing in-situ reduction on ferrous ions under the action of sodium borohydride to obtain the bacterial cellulose film / nano-iron composite material. According to the bacterial cellulose film / nano-iron composite material and the preparation method thereof, an activation in-situchemical precipitation method is adopted to prepare the bacterial cellulose film loaded nano-iron composite material, so that nano-iron is distributed unformly in the interior and on the surface of the bacterial cellulose film, and thus the ability of removal of microorganisms / organic pollutants is improved.

Description

technical field [0001] The invention belongs to the field of preparation of organic-inorganic composite materials, and in particular relates to a bacterial cellulose / nanometer iron composite material and its preparation method and application. Background technique [0002] Bacterial cellulose (bacterial cellulose), also known as microbial cellulose, is a biopolymer produced by bacteria. Known as β-1,4-glucose, it is a new type of biomaterial with high crystallinity, high water holding capacity, ultrafine nanofiber network and high elastic modulus. As a new and efficient reducing agent, nano-iron is widely used in the treatment of heavy metals and organic pollutants in water. However, due to its nanostructure, it is prone to agglomeration, resulting in a decrease in its activity. Therefore, how to reduce the agglomeration of nano-iron and improve its reactivity is an urgent problem to be solved. Contents of the invention [0003] The purpose of the present invention is t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/12C02F1/70C08L1/02
CPCC02F1/705C08J7/12C08J2301/02
Inventor 程荣申亮杰康敉陈迪石磊郑祥马中
Owner RENMIN UNIVERSITY OF CHINA
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