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Composite nano-adsorption material, preparation method and application thereof

A nano-adsorption material and nano-particle technology, applied in the field of preparation and composite nano-adsorption materials, can solve the problems of easy hydrolysis and reduce the adsorption capacity of heavy metal ions, and achieve the effects of reducing the degree of hydrolysis, improving the hydrophobicity and improving the adsorption efficiency.

Inactive Publication Date: 2020-03-31
南京二维纳米科技有限公司
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Problems solved by technology

Then in the subsequent actual treatment process, since heavy metal ions such as mercury ions, copper ions, and chromium ions are all weak alkali salts, most of the industrial wastewater containing heavy metal ions is weakly acidic, and the surface grafted and modified magnetic nano-Fe of chitosan 3 o 4 The material is prone to hydrolysis during use, which greatly reduces its adsorption capacity for heavy metal ions during its secondary use

Method used

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  • Composite nano-adsorption material, preparation method and application thereof
  • Composite nano-adsorption material, preparation method and application thereof
  • Composite nano-adsorption material, preparation method and application thereof

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preparation example Construction

[0021] In order to solve the above problems, a preparation method of a composite nano-adsorbent material is designed, which includes the following steps:

[0022] S1, Preparation of nanoparticles: the and Mix according to the molar ratio of 1: (0.5-0.8), and dissolve in deionized water, then add ammonia water dropwise to the mixed solution, adjust the pH to 9-11, and stir vigorously under the protection of inert gas. After the mixed solution turns from orange red to black, continue to react for 15-30 minutes, centrifuge to obtain a black powder, wash it repeatedly with deionized water until neutral, and dry it in a vacuum environment at 70-90°C to obtain nanoparticles.

[0023] S2, Preparation of nanoparticles: the prepared as described in step S1 Add 0.1-0.5g of nanoparticles into 100-1000mL of 80% ethanol solution with a mass concentration of 80%, add 2-6mL tetraethyl orthosilicate, then add ammonia water dropwise to the mixed solution, adjust the pH to 10-11, St...

Embodiment 1

[0037] Preparation of nanoparticles: 3.5584 g of and 1.9476g of Mix and dissolve in 2500ml of deionized water, then add ammonia water dropwise to the mixed solution, adjust the pH to 10.0, and stir vigorously under the protection of an inert gas until the mixed solution turns from orange red to black, then continue the reaction for 30 minutes. Centrifuge to obtain a black powder, wash it repeatedly with deionized water until neutral, and dry it under a vacuum environment at 85°C to obtain nanoparticles;

[0038] Preparation of nanoparticles: the prepared Add 0.2 g of nanoparticles into 200 mL of 80% ethanol solution with a mass concentration of 80%, add 3 mL of tetraethyl orthosilicate, then add ammonia water to the mixed solution dropwise, adjust the pH to 10.0, stir at room temperature for 9 h, and then pass through the magnetic Separation and washing with deionized water Repeated washing with deionized water to neutrality, drying in a vacuum environment at 85°C, ...

Embodiment 2

[0040] This embodiment is carried out on the basis of embodiment 1.

[0041] Preparation of composite nano-adsorbent material: the prepared in Example 1 Add 0.2 g of nanoparticles into 200 mL of 80% ethanol solution, then add 3 mL of tetraethyl orthosilicate, 0.5 g of chitosan, and 0.1 g of sodium fluoride in batches as a catalyst, and stir at room temperature for 24 h. Then magnetically separate, wash with deionized water repeatedly until neutral, and dry under vacuum at 36°C to obtain the product.

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Abstract

The invention discloses a composite nano-adsorption material, a preparation method and an application thereof and belongs to the field of nanomaterials. The preparation method includes: preparing Fe3O4 nanoparticles, preparing Fe3O4@SiO nanoparticles, preparing Fe3O4 composite nano-adsorptive material. In the invention, by combining the nano-magnetic ions with chitosan, the adsorption efficiency of the composite nano-adsorptive material is improved by means of the large specific surface area of the chitosan; in addition, after the material adsorbs the heavy metal ion, the material can be rapidly recycled under a low-intensity magnetic field, then the material is washed to remove the heavy metal ions for recovery. Besides, by modification and crosslinking of the chitosan, the hydrophobilityof the chitosan is improved, and hydrolysis degree of the chitosan in an acidic condition is reduced, and performance stability during recycling is enhanced.

Description

technical field [0001] The invention belongs to the field of nanometer materials, in particular to a composite nanometer adsorption material, a preparation method and an application thereof. Background technique [0002] Heavy metal pollution has become an urgent environmental problem worldwide. Heavy metal pollutants come from a wide range of sources, have strong biological toxicity and are easy to accumulate in organisms, and cannot be degraded naturally, causing permanent poisoning to humans and livestock. For fishery, because heavy metals will be enriched in fish; for agriculture, heavy metals in irrigation water will affect the normal growth of crops, and be enriched in roots, stems, fruits and other organs of crops. Harmful to human and animal health. Heavy metal ions ingested by aquatic animals and plants will quickly accumulate through the food chain, threatening the entire ecosystem. [0003] At present, the use of magnetic nanomaterials to selectively adsorb hea...

Claims

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Application Information

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IPC IPC(8): B01J20/24C02F1/28B01J20/30B01J20/28C02F101/20
CPCB01J20/06B01J20/103B01J20/24B01J20/28009C02F1/281C02F1/286C02F2101/20
Inventor 董文英孙俪
Owner 南京二维纳米科技有限公司
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