A kind of soil heavy metal fixing agent and its preparation method and application

A fixative and heavy metal technology, applied in the field of soil remediation, can solve the problem of limited adsorption and fixation of heavy metals

Active Publication Date: 2019-02-22
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the adsorption and fixation effect of pure biomass power plant ash on heavy metals is very limited.

Method used

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  • A kind of soil heavy metal fixing agent and its preparation method and application
  • A kind of soil heavy metal fixing agent and its preparation method and application
  • A kind of soil heavy metal fixing agent and its preparation method and application

Examples

Experimental program
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Effect test

preparation example Construction

[0124] The present invention also provides a kind of preparation method of described fixing agent, comprises the steps:

[0125] 1) Provide component A, component B and lye, wherein,

[0126] Component A is biomass power plant ash particles;

[0127] Component B is a substance selected from the group consisting of alginic acid, alginate, or a combination thereof;

[0128] And the lye comprises a first solvent and an alkaline substance dissolved in the first solvent;

[0129] 2) under stirring conditions, adding the ash particles of the biomass power plant into the alkaline solution to obtain the first mixed solution;

[0130] 3) Under stirring conditions, heating the first mixed liquid obtained in step 2) to a first heat treatment temperature, adding the component B to the first mixed liquid at the first heat treatment temperature to obtain a second mixed liquid liquid;

[0131] 4) Heat treating the second mixed liquid obtained in step 3) at the first heat treatment temper...

Embodiment 1

[0161] Embodiment 1 Fixative 1

[0162] Add 10g of biomass power plant ash to 100mL of sodium hydroxide solution with a molar concentration of 0.5mol / L, stir for 30 minutes, then ultrasonicate for 10 minutes, stir and react at room temperature for 2 hours, filter and wash the reacted product, and dry at 40°C. Fixative 1 was obtained.

[0163] result

[0164] The obtained fixative was tested by XRD, TEM and FT-IR.

[0165] figure 1 It is the XRD collection of patterns of embodiment 1 gained fixing agent 1. From figure 1 It can be seen that the main components of the obtained fixing agent 1 are silicon dioxide and calcium carbonate.

[0166] figure 2 It is the TEM picture of the fixative 1 obtained in Example 1. From figure 2It can be seen that the morphology of the obtained fixative 1 is different from that of the raw material power plant ash, which is mainly because the sodium hydroxide solution can convert a small amount of other carbonates on the surface of the cal...

Embodiment 2

[0168] Embodiment 2 Fixative 2

[0169] Add 20g of biomass power plant ash to 100mL of sodium hydroxide solution with a molar concentration of 0.1mol / L, stir and react at room temperature for 4 hours, filter and wash the reacted product with water, and dry at 40°C to obtain Fixative 2.

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Abstract

The invention relates to a soil heavy mental fixing agent and a preparation method therefor and application thereof, particularly a soil heavy mental fixing agent. The soil heavy mental fixing agent is a compound which is compounded by a component A and a component B, wherein the component A is biomass power plant ash particles and the component B is selected from the following substances: alginic acid, alginate or combination thereof. The invention further discloses the preparation method therefor and application thereof. The preparation method therefor has the characteristics of being simple in process, low in cost and convenient to implement and popularize on a large scale. Heavy metals in soil can be efficiently and persistently fixed by using the fixing agent.

Description

technical field [0001] The invention relates to the field of soil restoration, in particular to a soil heavy metal fixative and its preparation method and application. Background technique [0002] As a persistent pollutant, heavy metals have been paid more and more attention to. Soil heavy metal pollution refers to the heavy metals brought into the soil due to human activities, resulting in the heavy metal content in the soil being significantly higher than the background content. Soil heavy metal immobilization technology is an effective method to control heavy metal pollution. This technology changes the physical and chemical properties of soil by adding heavy metal fixatives, and changes the existing forms of heavy metals in soil through adsorption or co-precipitation of heavy metals, thereby reducing its pollution. Bioavailability and mobility, and finally the heavy metals in the soil can be fixed. [0003] Today, the production capacity of biomass direct combustion ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40C09K101/00
Inventor 吴爱国刘弘禹张玉杰
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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