Modified starch magnetic nano compound and preparation method and application thereof

A nanocomposite and magnetic nanotechnology, which is applied in the direction of alkali metal compounds, chemical instruments and methods, and other chemical processes, can solve the problems of non-reusable, cumbersome cross-linking steps, and time-consuming adsorption of heavy metal ions, etc., and shorten the synthesis cycle , the extraction rate is considerable, the effect of saving manpower and energy

Active Publication Date: 2012-10-10
HUNAN NORMAL UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

CN102380348A disclosed a preparation method of a pectin-modified magnetic nano-adsorbent and its application in the treatment of heavy metal wastewater on March 21, 2012; Glue is coated on the surface of the magnetic nanoparticle matrix, and the finished product is obtained by separating the precipitate, washing, and drying. This product has a good adsorption effect on heavy metal copper, lead, zinc, etc., but its adsorption on heavy metal ions is time-consuming and cannot reuse
[0006] At present, epichlorohydrin and sodium trimetaphosphate are commonly used as starch crosslinking agents, and the crosslinking steps are cumbersome.
An essential property of a starch crosslinking agent is to have multifunctional groups to react with hydroxyl groups on starch; EDTA is a tetrabasic acid that can provide multifunctional groups that react with starch; and EDTA is also a "NO type" chelating agent, It can form stable chelates with many hard acids, soft acids and intermediate acids. It is a commonly used chelating agent with low price and less pollution. However, there is no ethylenediaminetetraacetic acid (EDTA) modified starch in the prior art. Preparation of nanocomposites and report on their application in the treatment of heavy metal ions in water samples

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  • Modified starch magnetic nano compound and preparation method and application thereof
  • Modified starch magnetic nano compound and preparation method and application thereof
  • Modified starch magnetic nano compound and preparation method and application thereof

Examples

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Embodiment 1

[0030] The modified starch magnetic nanocomposite ES-Fe of the present embodiment 3 o 4 The preparation method of NPs comprises the following steps:

[0031](1) 6.0 g of ethylenediaminetetraacetic acid (EDTA) was dissolved in 60 mL of deionized water, 10 g of potato starch was dissolved in it and completely gelatinized, placed in a microwave reactor and microwaved at 40% output power for 600 s, cooled to room temperature, washed five times with water and absolute ethanol, and dried at 45°C for 8 h to obtain starch derivative ES, which was pulverized for later use;

[0032] (2) Dissolve 1.0 g ES in 100 mL N 2 In deionized water after oxygen removal, heat up to 80 °C, stir for 25 min, then dissolve 5.8 g of ferric nitrate and 2.3 g of ferrous sulfate in the solution, and add 10 mL of 26% by mass concentration of Ammonia water was reacted for 1 h under the protection of nitrogen, magnetically separated after standing, washed with deionized water until neutral, and the magneti...

Embodiment 2

[0049] The modified starch magnetic nanocomposite ES-Fe of the present embodiment 3 o 4 The preparation method of NPs comprises the following steps:

[0050] (1) Dissolve 2.0 g of ethylenediaminetetraacetic acid (EDTA) in 50 mL of deionized water, dissolve 5 g of potato starch in it and completely gelatinize it, place it in a microwave reactor and heat it with microwave at 40% output power for 300 s, cooled to room temperature, washed five times with water and absolute ethanol, and dried at 45°C for 6 h to obtain starch derivative ES, which was pulverized for later use;

[0051] (2) Dissolve 1.0 g ES in 100 mL N 2 In deionized water after oxygen removal, heat up to 80 °C, stir for 30 min, then dissolve 5.8 g of ferric nitrate and 2.3 g of ferrous sulfate in the solution, and add 10 mL of 26% ferrous sulfate under stirring at 1500 rpm Ammonia water was reacted for 4 h under the protection of nitrogen, magnetically separated after standing, and washed with deionized water un...

Embodiment 3

[0061] The modified starch magnetic nanocomposite ES-Fe of the present embodiment 3 o 4 The preparation method of NPs comprises the following steps:

[0062] (1) Dissolve 8.0 g of ethylenediaminetetraacetic acid (EDTA) in 100 mL of deionized water, dissolve 15 g of potato starch in it and completely gelatinize it, place it in a microwave reactor and heat it with microwave at 40% output power for 800 s, cooled to room temperature, washed 5 times with water and absolute ethanol respectively, and dried at 45 °C for 10 h to obtain starch derivative ES, which was pulverized for later use;

[0063] (2) Dissolve 1.0 g ES in 100 mL N 2 In deionized water after oxygen removal, heat up to 80 °C, stir for 35 min, then dissolve 5.8 g of ferric nitrate and 2.3 g of ferrous sulfate in the solution, and add 10 mL of 26% by mass concentration of Ammonia water was reacted for 2 h under the protection of nitrogen, magnetically separated after standing, washed with deionized water until neut...

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Abstract

The invention relates to a modified starch magnetic nano compound and a preparation method and application thereof. The modified starch magnetic nano compound is expressed as ES-Fe3O4 NPs. The invention further comprises the preparation method of the modified starch magnetic nano compound and the application of the modified starch magnetic nano compound to desorption of heavy metal ions in waste water. The magnetic particles of the modified starch magnetic nano compound have small particle diameters and large specific surface areas and are easy to combined with target substances; when the modified starch magnetic nano compound is utilized to desorb the heavy metal ions in the waste water, the speed is high, the extraction ratio is considerable, and the magnetic particles can be used repeatedly; separation is quick under the action of an external magnetic field, and centrifugal operation is not needed to facilitate the simplification and the automatization of the separation process; raw materials are cheap and easy to obtain, the synthesis steps are greatly simplified, and the synthesis cycle is short; no toxic substance is used in the synthesis process, so that safety and environmental friendliness are achieved; and the operation is simple, the time consumption is low, the efficiency is increased, and manual labor and energy sources are saved.

Description

technical field [0001] The invention relates to a modified starch magnetic nanocomposite and its preparation method and application, in particular to an ethylenediaminetetraacetic acid modified starch magnetic nanocomposite and its preparation method and application. Background technique [0002] At present, traditional methods are mainly used to remove heavy metal ions in wastewater, such as: neutralization precipitation method, ion exchange method, flocculation method and adsorption method. The economic benefits are not ideal, the operation is cumbersome and secondary pollution and other problems. [0003] Functionalized magnetic composites are used as metal ion adsorbents because of their surface functionalization, large specific surface area, and rapid directional separation in a magnetic field. They have broad application prospects. [0004] At present, the research work on magnetic particles used to remove heavy metal ions has achieved certain results. CN102380348A d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28C02F1/62
Inventor 马铭唐博邓巧慧薛临桃常泽英
Owner HUNAN NORMAL UNIVERSITY
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