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Cellulose base/Fe3O4 composite adsorption material used for removing arsenic in water and preparation method thereof

A composite adsorption material, cellulose-based technology, used in water/sewage treatment, chemical instruments and methods, adsorbed water/sewage treatment, etc. Remove, easy to remove, easy to apply effect

Active Publication Date: 2012-05-30
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These common adsorbents will encounter a problem in the process of water treatment, that is, the adsorbent is not easy to remove, and the process of removing the adsorbent is not only time-consuming, but also increases the cost

Method used

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  • Cellulose base/Fe3O4 composite adsorption material used for removing arsenic in water and preparation method thereof
  • Cellulose base/Fe3O4 composite adsorption material used for removing arsenic in water and preparation method thereof
  • Cellulose base/Fe3O4 composite adsorption material used for removing arsenic in water and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Using wheat straw as raw material mechanically pulverized wheat straw powder to prepare cellulose-based / Fe 3 o 4 (sample 1), and carry out the test of adsorption performance to sample 1

[0041] In a 100mL single-mouth bottle, add 0.5g of mechanical crushing to obtain a specific surface area of ​​0.1m 2 / g of wheat straw powder (the SEM photo of this wheat straw powder is shown in figure 1 ), and 50mLFeCl 3 / FeSO 4 Mixed aqueous solution (Fe 3+ with Fe 2+ The molar ratio is 2:1, the total concentration is 0.01mol / L), and 1 mL of ammonia water with a mass concentration of 25% is added under the protection of nitrogen to obtain a reaction system. The closed reaction system is reacted for 10 hours at 50 ° C. Precipitation method loads Fe on the surface of the wheat straw powder 3 o 4 Particles; after the reaction is over, the reaction product is repeatedly washed with water, magnetically separated, and vacuum-dried to obtain arsenic-free cellulose-based / Fe 3 o 4 ...

Embodiment 2

[0044] Using wheat straw as raw material mechanically pulverized wheat straw powder to prepare cellulose-based / Fe 3 o 4 (sample 2), and carry out the test of adsorption performance to sample 2

[0045] In a 100mL single-mouth bottle, add 0.5g of mechanical crushing to obtain a specific surface area of ​​10m 2 / g of wheat straw powder, and 50mLFeCl 3 / FeSO 4 Mixed aqueous solution (Fe 3+ with Fe 2+ The molar ratio is 2:1, the total concentration is 0.5mol / L), under the protection of nitrogen, add 10mL of ammonia water with a mass concentration of 25%, to obtain a reaction system, a closed reaction system, and react for 4 hours at 70 ° C. Precipitation method loads Fe on the surface of the wheat straw powder 3 o 4 Particles; after the reaction is over, the reaction product is repeatedly washed with water, magnetically separated, and vacuum-dried to obtain arsenic-free cellulose-based / Fe 3 o 4 Composite adsorbent material sample 2, the Fe 3 o 4 Granules make the cellul...

Embodiment 3

[0050] The cellulose fibers obtained after crushing the board prepared by using wood chips as raw materials were used to prepare the cellulose-based / Fe 3 o 4 (sample 3), and carry out the test of adsorption performance to sample 3

[0051] In a 100mL single-necked bottle, add 0.4g of mechanically pulverized cellulose fibers with a diameter of 10nm-100μm (see the SEM photo of the cellulose fibers in figure 2 ), and 50mLFeCl 3 / FeSO 4 Mixed aqueous solution (Fe 3+ with Fe 2+ The molar ratio is 2:1, and the total concentration is 1mol / L), under the protection of nitrogen, add 4mL of ammonia water with a mass concentration of 25%, to obtain a reaction system, close the reaction system, react for 24 hours at 20°C, and pass through in-situ co-precipitation method to load Fe on the surface of the cellulose fiber 3 o 4 Particles; after the reaction is over, the reaction product is repeatedly washed with water, magnetically separated, and vacuum-dried to obtain arsenic-free cel...

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Abstract

The invention relates to a cellulose base / Fe3O4 composite adsorption material used for removing arsenic in water and a preparation method thereof. According to the invention, with fibers or powder of natural cellulose or fibers of a cellulose derivative as a cellulose matrix material for the composite adsorption material, in an alkaline water system provided by ammoniacal liquor, Fe3O4 particles are loaded on the surface of the cellulose matrix material through in-situ co-precipitation, and the loaded Fe3O4 particles enable the obtained cellulose base / Fe3O4 composite adsorption material to have magnetism and to be easily removed from water, and allow harmful ions like arsenate ions and arsenite ions in water to be absorbed. Compared to arsenic removal materials in the prior art, the invention has the following characteristics: a natural biomass is used as an adsorption carrier, and the natural biomass is cheap and highly efficient, enables the content of arsenic in water to be substantially lower than a national standard and is easy to remove and convenient to use.

Description

technical field [0001] The invention belongs to the field of cellulose surface functionalization to prepare water treatment adsorption materials, in particular to a material for efficiently adsorbing arsenic in water based on natural cellulose or cellulose derivatives and a preparation method thereof. Background technique [0002] In recent years, arsenic pollution has become a very serious environmental pollution problem. Arsenic is a protoplasmic poison derived from oxidative climates, geochemical reactions, and human activities. In water, arsenic is mainly arsenite (AsO 2 - )(III) and arsenate (AsO 4 3- ) (V) Two inorganic forms exist, and the solubility of arsenite in water is generally much higher than that of arsenate. The ingestion of arsenic can lead to skin cancer, lung cancer, kidney cancer, liver cancer, bladder cancer, etc., so it has been identified as a first-class carcinogen by the US Center for Disease Control (CDC) and the International Agency for Resea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62
Inventor 黄勇吴敏田野
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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