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A kind of soil heavy metal adsorbent and preparation method thereof

A heavy metal and adsorbent technology, applied in the directions of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc. At the same time, it is difficult to reuse and reuse problems, and achieve the effect of increasing adhesion performance, small particle size and low cost.

Active Publication Date: 2018-08-21
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when these magnetic adsorbents are separated from the soil under the action of an external magnetic field, due to the small size and easy aggregation of nanoparticles, it is easy to adhere to fine soil particles, especially when the water content in the soil is high. The separation of magnetic adsorbent and soil particles is not complete, and it is difficult to recycle and use, thus causing a certain amount of production waste

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  • A kind of soil heavy metal adsorbent and preparation method thereof
  • A kind of soil heavy metal adsorbent and preparation method thereof
  • A kind of soil heavy metal adsorbent and preparation method thereof

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preparation example Construction

[0045] Although sol-gel method and hydrothermal method are available in the prior art to coat nano-inorganic compounds on the outer surface of solid materials, and the nano-inorganic compounds coated by these methods have strong adhesion ability on solid materials. It is feasible to use these two methods to pre-load pure nano-inorganic compounds on the floating core. However, since the sol-gel method requires high-temperature calcination, and the hydrothermal method requires high-temperature and high-pressure environments in high-pressure reactors to prepare composite materials, Therefore these two kinds of methods are all unsuitable for the hybrid material loaded on the floating core proposed by the present invention to prepare the soil heavy metal adsorbent, because these two kinds of preparation methods will seriously destroy the organic macromolecules with chelating groups, making the compound The adsorption performance of the material is greatly reduced. Therefore, in the...

Embodiment 1

[0096] (1) Preparation of Humate / Magnetic Iron Oxide / Hollow Glass Microspheres Soil Heavy Metal Adsorbent

[0097] S1. Weigh 4.2g FeSO 4 ·7H 2 O and 6.1 g FeCl 3 ·6H 2 O was dissolved in 100ml of distilled water, and after heating to 30°C, 1.0g of hollow glass microspheres (average particle size 92μm, density 0.20g / cm2) were added 3 ), and fully dispersed evenly to obtain the first precursor solution; in addition, 0.5g of sodium humate was dissolved in 50ml of distilled water, and then 10ml of ammonia water with a concentration of 25% was added and mixed to obtain the second precursor solution.

[0098] S2. Add the second precursor solution to the first precursor solution and react in a water bath at 30° C. for 30 minutes. The reaction was continued for 1 h at room temperature.

[0099] S3. The processes of S1 and S2 are all carried out in a nitrogen atmosphere. After the reaction is completed, the reaction mixture is poured into a separatory funnel to stand for stratificat...

Embodiment 2

[0108] (1) Preparation of humate / magnetic iron oxide / floating pearl soil heavy metal adsorbent

[0109] S1. Weigh 4.2g FeSO 4 ·7H 2 O and 6.1 g FeCl 3 ·6H 2 O was dissolved in 100ml of distilled water, and after heating to 90°C, 1.0g of fly ash floating beads (average particle size 150μm, density 0.35g / cm2) were added 3 ), stirring to make it disperse evenly to obtain the first precursor solution; in addition, 0.5g sodium humate was dissolved in 50ml distilled water, and then 10ml concentration of 25% ammonia water was added to obtain the second precursor solution.

[0110] S2. Quickly pour the second precursor solution into the first precursor solution, react in a water bath at 90° C. for 30 minutes, and continue the reaction at room temperature for 60 minutes.

[0111] The processes of S3.S1 and S2 are all carried out in a nitrogen atmosphere. After the reaction is completed, pour the reaction solution into the separatory funnel and let it stand for stratification. Wash...

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Abstract

The invention discloses a soil heavy metal adsorbent and a preparation method thereof.The density of the soil heavy metal adsorbent is smaller than 1 g / cm<3>.The soil heavy metal adsorbent comprises a floating core and a hybrid material, wherein the mass ratio of the floating core to the hybrid material ranges from 1:1 to 100,000:1, the grain size of the floating core ranges from 10 micrometers to 2,000 micrometers, and the density of the floating core is smaller than 0.5 g / cm<3>; the outer surface of the floating core is covered with the hybrid material; the hybrid material comprises 0.001 wt%-20 wt% of an organic polymer with chelation groups and 80 wt%-99.999 wt% of a nanometer inorganic compound.The invention further discloses the preparation method of the soil heavy metal adsorbent.The heavy metal adsorbent is composed of the light floating core loaded nanometer inorganic compound and the organic polymer with the chelation groups, is easy to separate, absorb, regenerate and reuse, and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal pollution control and restoration, and more specifically relates to a soil heavy metal adsorbent and a preparation method thereof. Background technique [0002] The discharge of "three wastes" from industrial production, the discharge of urban domestic sewage and automobile exhaust, and the improper use of heavy metal-containing pesticides and fertilizers have made the problem of heavy metal pollution in my country's soil increasingly serious, posing a serious threat to the health of our people. At present, the treatment and repair methods of soil with heavy metals exceeding the standard mainly include environmental protection leaching technology and passivating agent stable immobilization technology. [0003] However, the leaching technique is likely to lead to the loss of various nutrients in the soil and the change of soil physical and chemical properties, and the residue of leaching a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30B01J20/28
CPCB01J20/02B01J20/048B01J20/06B01J20/103B01J20/24B01J20/28009B01J20/28011B01J2220/46
Inventor 彭红王琳玲陈静黄炎俊陆晓华龚跃法王洪李鸿博
Owner HUAZHONG UNIV OF SCI & TECH
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