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Application of iron-based cellulose nano composite material in water environment

A nano-composite material and cellulose technology, applied in water pollutants, alkali metal compounds, water/sewage treatment, etc., can solve the problems of reduced reactivity, less active sites, and low loading capacity, so as to improve dispersibility and Stability, improving the phenomenon of easy agglomeration, and improving the effect of adsorption efficiency

Inactive Publication Date: 2021-08-17
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large specific surface area and the presence of magnetism, the nano zero-valent iron particles are easy to agglomerate and precipitate, which greatly reduces its original reactivity.
[0003] At present, the prior art discloses, for example, the use of reduced spherical cellulose adsorbents loaded with zero-valent iron and nano-magnesium hydroxide, and nano-zero-valent iron / cellulose composite materials with a beaded structure, and chemically modified nano-cellulose adsorption materials, however, these methods involve high-energy-consuming instruments such as freeze-drying, cumbersome steps, long time-consuming and low economic applicability
Moreover, the addition of silane coupling agents and toxic organic substances in the preparation process of composite materials has problems of refractory degradation and secondary pollution.
What's more serious is that in terms of nano-zero-valent iron modification, the traditional polymer sodium carboxymethyl cellulose (CMC) is used to modify nZVI. Experiments have proved that CMC-modified nZVI particles (CMC-nZVI) have certain Dispersion and improving the effect of nZVI on the removal rate of Cr(VI), but due to the slow release effect of traditional CMC in removing heavy metals and the limitations of one-step synthesis, CMC-nZVI still has obvious agglomeration and active sites Disadvantages such as less and low load capacity

Method used

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  • Application of iron-based cellulose nano composite material in water environment
  • Application of iron-based cellulose nano composite material in water environment
  • Application of iron-based cellulose nano composite material in water environment

Examples

Experimental program
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Effect test

preparation example Construction

[0025] The iron-based cellulose nanocomposites can first be mixed with Fe-containing 3+ In-situ synthesis of nano-cellulose iron ion mixed solution in aqueous solution, and then by mixing with sodium borohydride aqueous solution, the iron-based cellulose nanocomposite material with the three-dimensional network structure was prepared by the liquid phase reduction method. The preparation method includes but is not limited to The following steps:

[0026] S1: Disperse the nanocellulose solution into deionized water, stir and inject inert gas to obtain a nanocellulose dispersion;

[0027] S2: mixing an aqueous solution containing iron ions with the nanocellulose to obtain a mixed solution of nanocellulose iron ions;

[0028] S3: adding an aqueous solution of sodium borohydride to the mixed liquid to carry out a reduction reaction, and the obtained solid is the iron-based cellulose nanocomposite material with a three-dimensional network structure.

[0029] In the above step S1, ...

Embodiment 1

[0035] Disperse 14 mL of 0.01% w / w cellulose nanocrystals (CNC) into 6 mL of deionized water, mix evenly with a rotary stirrer, and pass through nitrogen for 10 minutes to prepare a dispersion liquid containing CNC.

[0036] 6.76g FeCl 3 ·6H 2 O solid was dissolved in 480mL deionized water, and then 3+ Slowly mix the aqueous solution with the CNC dispersion liquid, and form a uniform dispersion system after stirring for 5 minutes to obtain the cellulose nanocrystal iron ion mixed solution (CNC-Fe 3+ ).

[0037] Transfer 0.2M 500mL sodium borohydride aqueous solution to the mixed solution of nanocellulose whiskers and iron ions (CNC-Fe 3+ ), after mixing evenly, let it stand for 10-20min to remove the supernatant, and carry out magnetic separation. First, wash 3-5 times with water, then wash 3-5 times with absolute ethanol, and store it in absolute ethanol solution to obtain a three-dimensional Reticulated cellulose nanowhiskers / nano zero-valent iron composite (CNC-nZVI). ...

Embodiment 2

[0044] Disperse 14 mL of 0.01% w / w cellulose nanofibers (CNF) into 6 mL of deionized water, mix evenly with a rotary stirrer, and pass through nitrogen for 10 min to prepare a dispersion containing CNF.

[0045] 6.76g FeCl 3 ·6H 2 O solid was dissolved in 480mL deionized water, and then 3+ Slowly mix the aqueous solution of the CNF dispersion with the CNF dispersion, and form a uniform dispersion system after stirring for 5 minutes to obtain the cellulose nanofiber iron ion mixed solution (CNF-Fe 3+ ).

[0046] Transfer the 0.2M 500mL sodium borohydride aqueous solution to the nanocellulose fiber iron ion mixed solution, mix well and let it stand for 10-20 minutes to remove the supernatant, and perform magnetic separation. First, wash with water for 3-5 times, and then pass through absolute ethanol Wash for 3-5 times and store in absolute ethanol solution to prepare a three-dimensional net-like cellulose nanofiber / nano zero-valent iron composite (CNF-nZVI).

[0047] Perf...

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Abstract

The invention provides application of an iron-based cellulose nano composite material in a water environment. The iron-based cellulose nano composite material is used for adsorbing and reducing heavy metal ions in a water environment; and the iron-based cellulose nano composite material is of a three-dimensional network structure composed of nano cellulose and nano zero-valent iron, wherein the diameter of the iron-based cellulose nano composite material is 5-70 nm, and the particle size of the iron-based cellulose nano composite material is 300-1000 nm. The iron-based cellulose nano composite material provided by the invention has the advantages of large specific surface area and high heavy metal adsorption and reduction capability, the dispersity of nano zero-valent iron in a water environment is effectively improved, and the in-situ synthesis method is simple to operate and can be recycled, so that heavy metal ions in the water environment can be efficiently removed.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to the use of an iron-based cellulose nanocomposite material in a water environment. Background technique [0002] Water resources are resources that human beings rely on in production and life. The presence of heavy metal pollution in the water environment seriously affects human health. Therefore, improving the water environment to restore heavy metal pollution and seeking low-cost, effective, safe and environmentally friendly water purification technologies have always attracted attention. Nano-zero-valent iron has the characteristics of large specific surface area, high reactivity and strong reducibility, and is widely used in the remediation of heavy metals in polluted water bodies. It is an efficient reaction medium material for the remediation of groundwater and industrial water. However, due to the large specific surface area and the presence of magnetism, the nan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28C02F1/28C02F101/20
CPCB01J20/24B01J20/02B01J20/28007C02F1/281C02F1/286C02F2101/20
Inventor 邓子龙宋明阳张伟贤
Owner TONGJI UNIV
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