A kind of bead structure nano zero-valent iron/cellulose composite material and its application

A technology of nano-zero-valent iron and nano-cellulose, which is applied in other chemical processes, water/sewage treatment, adsorption water/sewage treatment, etc., can solve the problems of reducing the activity of nano-zero-valent iron, high surface energy, and reduced activity. Achieve good stabilization and strong adsorption performance

Active Publication Date: 2020-03-10
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] Compared with conventional pollutant-degrading materials, nano-zero-valent iron has a better degradation effect on trace organic pollutants and heavy metals, but in practical applications, nano-zero-valent iron has at least the following problems: nano-zero-valent iron has high surface energy , easy to agglomerate, reducing the activity of nano-zero-valent iron; Wide application of zero valent iron

Method used

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  • A kind of bead structure nano zero-valent iron/cellulose composite material and its application
  • A kind of bead structure nano zero-valent iron/cellulose composite material and its application
  • A kind of bead structure nano zero-valent iron/cellulose composite material and its application

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preparation example Construction

[0029] A kind of bead structure nanometer zero valent iron / cellulose composite material, its preparation method comprises the following steps:

[0030] Step A, according to the ratio of 100mL deionized water and 1mL mass fraction of 25% glutaraldehyde per 0.4g nanocellulose, the nanocellulose is dispersed in deionized water, and the pH value of the solution is adjusted to 2 by adding hydrochloric acid , then add glutaraldehyde with a mass fraction of 25%, and carry out a hydrothermal reaction at a hydrothermal temperature of 160° C. for 5 hours after dispersion, thereby obtaining a crosslinked nanocellulose hydrogel; The hydrogels were freeze-dried to produce three-dimensional nanocellulose with micro / nanoporous structures.

[0031] Step B, according to every 0.005~0.02mol FeSO 4 Using the proportion of 60mL water, the FeSO 4 dissolved in water to obtain FeSO 4 Aqueous solution; according to every 0.005 ~ 0.02mol FeSO 4 Using a ratio of 0.2 g of the three-dimensional nanoc...

Embodiment 1

[0048] A kind of bead structure nanometer zero valent iron / cellulose composite material, its preparation method comprises the following steps:

[0049] Step a1, drying the corn stalks first, then crushing them with a pulverizer, and passing through a 60-mesh sieve to obtain corn stalk powder whose particle size exceeds 60 mesh sieves; take 10 g of the corn stalk powder and put it into a 250 mL round bottom flask , and then add 150mL of toluene and ethanol mixed solution (the toluene and ethanol mixed solution is formed by mixing toluene and ethanol according to the volume ratio of 2:1), and after stirring for 6 hours, suction filtration and washing, so as to obtain the first reactant.

[0050] Step b1, add 150mL acetic acid-acidified sodium chlorite solution to the first reactant (the acetic acid-acidified sodium chlorite solution can be made of acetic acid and sodium chlorite according to the amount of 6g sodium chlorite used for every 22.5mL acetic acid Proportion mixed), an...

Embodiment 2

[0058] A kind of bead structure nanometer zero valent iron / cellulose composite material, its preparation method comprises the following steps:

[0059] Step a2, drying the corn stalks first, then crushing them with a pulverizer, and passing through a 60-mesh sieve to obtain corn stalk powder whose particle size exceeds 60 mesh sieves; take 10 g of the corn stalk powder and put it into a 250 mL round bottom flask , and then add 150mL of toluene and ethanol mixed solution (the toluene and ethanol mixed solution is formed by mixing toluene and ethanol according to the volume ratio of 2:1), and after stirring for 6 hours, suction filtration and washing, so as to obtain the first reactant.

[0060] Step b2, add 150mL acetic acid-acidified sodium chlorite solution to the first reactant (the acetic acid-acidified sodium chlorite solution can be made of acetic acid and sodium chlorite according to the amount of 6g sodium chlorite used for every 22.5mL acetic acid Proportion mixed), an...

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Abstract

The present invention discloses a beaded structural nano zero-valent iron / cellulose composite material and an application thereof. A preparation method of the composite material comprises the following steps: dispersing nano cellulose into deionized water, and adjusting the pH value of a solution to 2, then adding glutaraldehyde, performing dispersion, and performing a hydrothermal reaction for 5hours to obtain three-dimensional nano cellulose with a micro / nano pore structure; smashing the three-dimensional nano cellulose, and dispersing the smashed nano cellulose into a FeSO4 aqueous solution for a reaction, and performing centrifugalization to obtain a washed cellulose iron ion mixture; and dispersing the cellulose iron ion mixture into a deoxygenated aqueous solution, directly mixing the obtained material and a deoxygenated aqueous solution of sodium borohydride, performing shaking for 2 hours on a shaker, and performing magnetic separation to obtain the beaded structural nano zero-valent iron / cellulose composite material. The composite material provided by the invention not only has high stability and strong adsorption performance, but also has the simple preparation method, lower costs, no pollution to the environments, and can be used for adsorption and degradation of pollutants persistent to the environment.

Description

technical field [0001] The invention relates to the field of nano-zero-valent iron composite materials, in particular to a beaded-structure nano-zero-valent iron / cellulose composite material and an application thereof. Background technique [0002] Nano-zero-valent iron refers to nano-scale elemental iron, which not only has the characteristics of small particle size, large specific surface area and surface energy, but also has strong reducibility and strong adsorption, and is environmentally friendly. Therefore, nano-zero-valent iron can not only reduce and It can degrade heavy metal ions, inorganic compounds and organic halogenated pollutants in the environment, and can increase the degradation rate of pollutants. It can be seen that nano-zero-valent iron has obvious advantages in the treatment of environmental pollutants. [0003] Compared with conventional pollutant-degrading materials, nano-zero-valent iron has a better degradation effect on trace organic pollutants an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/22
CPCB01J20/02B01J20/24C02F1/288C02F2101/22
Inventor 康升红蔡伟平赵惠军汪国忠
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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