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Preparation method of goethite/carboxylated cellulose nanocrystalline composite material for removing heavy metal ions

A technology of carboxylated cellulose and heavy metal ions, applied in chemical instruments and methods, other chemical processes, water/sewage treatment, etc. Stable and rigid effect

Active Publication Date: 2021-06-15
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects, the present invention provides a hydrothermal synthesis of goethite / carboxylated cellulose nanocrystal composite material, which solves the problems of goethite agglomeration and cellulose nanocrystal separation difficulties, and applies it to adsorption wastewater heavy metal ions

Method used

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  • Preparation method of goethite/carboxylated cellulose nanocrystalline composite material for removing heavy metal ions
  • Preparation method of goethite/carboxylated cellulose nanocrystalline composite material for removing heavy metal ions
  • Preparation method of goethite/carboxylated cellulose nanocrystalline composite material for removing heavy metal ions

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Embodiment 1

[0038] This embodiment provides a goethite / carboxylated cellulose nanocrystalline composite material and a preparation method thereof, comprising the following steps:

[0039] (1) At room temperature, 32.5 g of 3.2 wt % carboxylated cellulose nanocrystals were dispersed in 67.5 g of deionized water, and magnetically stirred for 20 min to form a 1 wt % carboxylated cellulose nano crystal dispersion.

[0040] (2) add 1~10g Fe(NO in the dispersion liquid that step (1) obtains 3 ) 3 9H 2 O, magnetically stirred at room temperature for 8 h to obtain Fe 3+ / carboxylated cellulose nanocrystal complex mixture.

[0041] (3) Add 5M NaOH solution to the mixed solution obtained in step (2) while stirring to adjust the pH of the mixed solution to pH>13, and continue stirring for 30 s.

[0042](4) Transfer the mixed solution obtained in the step (3) to a hydrothermal reaction kettle and seal it, place it in an oven for hydrothermal reaction at 70°C for 12 hours, and wash the product re...

Embodiment 2

[0050] (1) Disperse 32.5g of 3.2wt% carboxylated cellulose nanocrystals in 67.5g of deionized water at room temperature, and magnetically stir for 20min to form a 1wt% carboxylated cellulose nanocrystal dispersion.

[0051] (2) in the dispersion liquid that described step (1) obtains, add 1g Fe (NO 3 ) 3 9H 2 O, magnetically stirred at room temperature for 8 h to obtain Fe 3+ / carboxylated cellulose nanocrystal complex mixture.

[0052] (3) Add 5M NaOH solution to the mixed solution obtained in step (2) while stirring to adjust the pH of the mixed solution to pH>13, and continue stirring for 30 s.

[0053] (4) Transfer the mixed solution obtained in the step (3) to a hydrothermal reaction kettle and seal it, place it in an oven for hydrothermal reaction at 70°C for 12 hours, and wash the product repeatedly with deionized water after the reaction is over. properties, and then washed 2 to 3 times with absolute ethanol, placed in a vacuum drying oven at 50 ° C and dried for ...

Embodiment 3

[0060] (1) Disperse 32.5g of 3.2wt% carboxylated cellulose nanocrystals in 67.5g of deionized water at room temperature, and magnetically stir for 20min to form a 1wt% carboxylated cellulose nanocrystal dispersion.

[0061] (2) in the dispersion liquid that described step (1) obtains, add 1g Fe (NO 3 ) 3 9H 2 O, magnetically stirred at room temperature for 8 h to obtain Fe 3+ / carboxylated cellulose nanocrystal complex mixture.

[0062] (3) Add 5M NaOH solution to the mixed solution obtained in step (2) while stirring to adjust the pH of the mixed solution to pH>13, and continue stirring for 30 s.

[0063] (4) Transfer the mixed solution obtained in the step (3) to a hydrothermal reaction kettle to seal it, place it in an oven for hydrothermal reaction at 70°C for 12 hours, and wash the product repeatedly with deionized water after the reaction is over. properties, and then washed with absolute ethanol for 2 to 3 times, placed in a vacuum drying oven at 50 ° C and dried f...

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Abstract

The invention provides a preparation method of a goethite / carboxylated cellulose nanocrystalline composite material for removing heavy metal ions. The heavy metal ions are in heavy metal wastewater. The composite material provided by the invention is formed by compounding goethite and carboxylated cellulose nanocrystalline through a hydrothermal method. The problems that goethite is easy to agglomerate, cellulose nanocrystals are difficult to separate and the like are solved, and the adsorption capacity on heavy metal ions is improved. The composite material obtained by the preparation method has relatively high adsorption capacity and relatively high adsorption rate on heavy metal ions such as Pb (II), Cd (II) and As (V). The raw materials used in the method are cheap and easy to obtain, the preparation process is simple, the conditions are mild, and the prepared goethite / carboxylated cellulose nanocrystalline composite material is a heavy metal adsorbent with excellent performance and low cost and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of new environmental functional materials and heavy metal wastewater treatment, and in particular relates to a preparation method of a goethite / carboxylated cellulose nanocrystal composite material for removing heavy metal ions. Background technique [0002] In recent years, the discharge of waste water from mineral resources development, electroplating, metal processing and smelting, tanning, and fertilizer production, as well as the application of chemical fertilizers and pesticides in agricultural activities, have led to the release of a large amount of heavy metals into the environment, aggravating heavy metal pollution in water. Heavy metals are highly toxic and non-biodegradable. Once they enter the water body, they will cause long-term pollution of the aquatic ecosystem, and they can enter the human body and other living organisms through drinking water and food chains to accumulate, causing irreversib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20
CPCB01J20/06B01J20/24C02F1/288C02F2101/20C02F2101/103
Inventor 滕玮陈燕燕付融冰范建伟张伟贤陈小倩马倩薛英浩冉献强孙宇
Owner TONGJI UNIV
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