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Bacterial cellulose membrane loaded nano zero-valent iron composite material, and preparation method and application thereof

A bacterial cellulose membrane, nano-zero valent iron technology, applied in chemical instruments and methods, special treatment targets, water/sludge/sewage treatment, etc. problem, to achieve the effect of no carcinogenicity, no biocompatibility, and improved anti-oxidation

Pending Publication Date: 2021-10-01
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention utilizes the unique three-dimensional structure and unique properties of the bacterial cellulose membrane, and loads nano-zero-valent iron on the bacterial cellulose membrane through the in-situ-chemical precipitation method, so that the nano-zero-valent iron is evenly distributed on the bacterial cellulose membrane, to a certain extent Above all, the problem that nano zero-valent iron is easy to agglomerate, easy to lose, and difficult to recycle is solved, thereby improving the reactivity of nano zero-valent iron, improving the removal effect of pathogenic microorganisms and organic pollutants in water bodies, thereby completing the present invention

Method used

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  • Bacterial cellulose membrane loaded nano zero-valent iron composite material, and preparation method and application thereof
  • Bacterial cellulose membrane loaded nano zero-valent iron composite material, and preparation method and application thereof
  • Bacterial cellulose membrane loaded nano zero-valent iron composite material, and preparation method and application thereof

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preparation example Construction

[0053] According to the present invention, the preparation method of the bacterial cellulose membrane-loaded nano-iron composite material comprises the following steps:

[0054] Step 1, cutting the bacterial cellulose membrane, and placing it in an alkaline solution at 60-90°C for activation treatment to obtain an activated-bacterial cellulose membrane;

[0055] Step 2, dehydrating the activated-bacterial cellulose membrane to obtain a semi-dehydrated-activated-bacterial cellulose membrane;

[0056] Step 3, placing the obtained semi-dehydration-activated-bacterial cellulose membrane in the ferrous salt solution, adding borohydride solution, and reacting;

[0057] Step 4, washing and drying the product obtained in step 3 to obtain the bacterial cellulose membrane-supported nano zero-valent iron composite material.

[0058] In the present invention, the type of bacterial cellulose is not particularly limited, it can be cellulose synthesized by conventional strains, for example,...

Embodiment 1

[0095] Use a mold to cut the bacterial cellulose membrane into discs of the same size D=24mm, place the obtained membranes in a container filled with 100ml of sodium hydroxide solution with a mass concentration of 20g / L, and stir at 80°C for 1h , to obtain activated-bacterial cellulose membrane;

[0096] The activated-bacterial cellulose membrane is cleaned with ultrapure water until PH=7;

[0097] Then the gained activated-bacterial cellulose membrane is placed in a beaker containing 100ml of ethanol / water with a volume ratio of 7 / 3, the control stirring speed is 160 rpm, and continuous stirring for 1h; the membrane is taken out and blotted dry with filter paper, Add it into ethanol again and continue to stir and extract for 1h, and dry it with filter paper again to obtain a semi-dehydrated-activated-bacterial cellulose membrane;

[0098] Take 10 pieces of semi-dehydrated-activated-bacterial cellulose membranes and place them in a four-necked flask, feed nitrogen as a protec...

Embodiment 2

[0100] Use a mold to cut the bacterial cellulose membrane into discs of the same size D=24mm, place the resulting membrane in a container filled with 100ml of sodium hydroxide solution with a mass concentration of 20g / L, and stir at 60°C for 2h , to obtain activated-bacterial cellulose membrane;

[0101] The activated-bacterial cellulose membrane is cleaned with ultrapure water until PH=7;

[0102] Then the gained activated-bacterial cellulose membrane is placed in a beaker containing 100ml of ethanol / water with a volume ratio of 7 / 3, the control stirring speed is 150 rpm, and continuous stirring for 1h; the membrane is taken out and blotted dry with filter paper, Add it into ethanol again and continue to stir and extract for 1h, and dry it with filter paper again to obtain a semi-dehydrated-activated-bacterial cellulose membrane;

[0103] Take 10 semi-dehydrated-activated-bacterial cellulose membranes and place them in a four-necked flask, feed nitrogen as a protective gas, ...

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Abstract

The invention discloses a bacterial cellulose membrane loaded nano zero-valent iron composite material, and a preparation method and application thereof. According to the composite material, nano zero-valent iron is loaded on a bacterial cellulose membrane, the nano zero-valent iron is spherical, the diameter of the nano zero-valent iron ranges from 80 nm to 120 nm, preferably, the nano zero-valent iron comprises an oxidation passivation layer, and the oxidation passivation layer is formed of an iron oxide. By utilizing the unique three-dimensional structure and unique performance of the bacterial cellulose membrane, the nano zero-valent iron is loaded on the bacterial cellulose membrane through an in-situ-chemical precipitation method, so that the nano zero-valent iron is uniformly distributed on the bacterial cellulose membrane, and the problems that the nano zero-valent iron is easy to agglomerate, easy to lose and difficult to recover are solved to a certain extent; therefore, the reaction activity of the nano zero-valent iron is improved, and the removal effect on pathogenic microorganisms and organic pollutants in the water body is improved.

Description

technical field [0001] The invention belongs to the field of organic-inorganic composite materials, and in particular relates to a bacterial cellulose membrane-loaded nanometer zero-valent iron composite material and a preparation method and application thereof. Background technique [0002] Urban reclaimed water contains a large number of pathogenic microorganisms. These pathogenic microorganisms will directly or indirectly contact the human body with the reuse of reclaimed water, causing water-borne diseases. Therefore, the efficient removal of pathogenic microorganisms is of great significance for the reuse of reclaimed water. [0003] Nano-scal Zero Valent Iron (NZVI) is a new and efficient environmental remediation material, which has the characteristics of small volume, large specific surface area and high surface activity. Studies have shown that nano-scale zero valent iron can remove various Pollutants, and it also shows good removal effect on pathogenic microorganis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C08J7/12C02F101/30C08L1/02
CPCC02F1/705C08J7/12C02F2101/30C02F2303/04C08J2301/02
Inventor 袁冬海赵银秀严陈玲
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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