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Soil heavy metal pollution barrier layer material as well as preparation method and application thereof

A technology for barrier materials and heavy metals, which is applied in the field of soil heavy metal pollution barrier layer materials and their preparation, can solve the problems of airtightness, water and nutrients cannot flow effectively, and polymer materials are difficult to degrade, and can increase the density and ratio of micropores. Surface area, simplified modification and activation steps, and the effect of facilitating large-scale application

Active Publication Date: 2021-11-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the barrier materials on the market are mainly polymer materials, which block both water and air while blocking heavy metals, making the water and nutrients in the soil unable to flow effectively and airtight, resulting in soil compaction and reduced fertility. It even causes the roots of plants to be soaked
At the same time, the raw materials of polymer materials are mainly non-renewable resources such as petroleum. The manufacturing process will pollute the environment, and the polymer materials themselves are difficult to degrade. If they are not handled properly, they will cause secondary pollution in the soil.

Method used

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  • Soil heavy metal pollution barrier layer material as well as preparation method and application thereof
  • Soil heavy metal pollution barrier layer material as well as preparation method and application thereof
  • Soil heavy metal pollution barrier layer material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of barrier layer material of heavy metals

[0030] 1, 120 parts of the urea-formaldehyde resin, 5 parts of graphite powder and 5 parts of aluminum potassium sulfate dodecahydrate mixed, pulverized after drying 120 deg.] C;

[0031] 2, the mixed powder prepared in Step 1 was heated in a nitrogen atmosphere at 800 deg.] C and held 3h, then cooled to room temperature;

[0032] 3, the product prepared in Step 2 was added 30 parts of potassium hydroxide and 25 parts of zinc chloride, uniformly mixed and ground, then the first phase of heating in a nitrogen atmosphere at a heating rate of 7 ℃ / min was heated to 600 ℃, then heating the second stage of heating at a ramp rate 3 ℃ / min from 600 deg.] C to 800 deg.] C, after incubation 2h, cooled to room temperature;

[0033] 4, using 2mol / L HCl solution, and deionized water of the product prepared in Step 3 was washed, i.e., the barrier material to give heavy metal contaminated soil.

Embodiment 2

[0035] Preparation of barrier layer material of heavy metals

[0036] 1, 110 parts of the urea-formaldehyde resin, 3 parts of graphite powder and 1 part of potassium aluminum sulfate dodecahydrate mixed, pulverized after drying 110 deg.] C;

[0037] 2, the mixed powder prepared in Step 1 was heated in a nitrogen atmosphere at 600 deg.] C and held IH, cooled to room temperature;

[0038] 3, the product prepared in Step 2 was added 25 parts of potassium hydroxide and 20 parts of zinc chloride, uniformly mixed and ground, then the first phase of heating in a nitrogen atmosphere at a heating rate of 5 ℃ / min was heated to 550 deg.] C, then heating the second stage at a heating rate of 2 ℃ / min heated from 550 deg.] C to 700 deg.] C, after incubation IH, cooled to room temperature;

[0039] 4, using 1mol / L HCl solution, and deionized water of the product prepared in Step 3 was washed, i.e., the barrier material to give heavy metal contaminated soil.

Embodiment 3

[0041] Preparation of barrier layer material of heavy metals

[0042] 1, 115 parts of the urea-formaldehyde resin, 4 parts of graphite powder and 3 parts of potassium aluminum sulfate dodecahydrate mixed, pulverized after drying 115 deg.] C;

[0043] 2, the mixed powder prepared in Step 1 was heated in a nitrogen atmosphere and kept at 700 deg.] C 1.5h, then cooled to room temperature;

[0044] 3, the product prepared in Step 2 was added 27 parts of potassium hydroxide and 23 parts of zinc chloride, uniformly mixed and ground, then the first phase of heating in a nitrogen atmosphere at a heating rate of 6 ℃ / min was heated to 570 ℃, then heating the second stage of heating at a heating rate of 2.5 ℃ / min from 570 ℃ to 750 ℃, after incubation 1.5h, cooled to room temperature;

[0045]4, using a 1.5 mol / L of HCl solution and deionized water to prepare the product prepared in step 3, that is, the soil heavy metal contaminated barrier layer material is obtained.

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Abstract

The invention discloses a soil heavy metal pollution barrier layer material and a preparation method and application thereof.The barrier layer material is prepared by mixing urea-formaldehyde resin, a carbonizer and a stabilizer, carbonizing the mixture in the nitrogen atmosphere, then adding potassium hydroxide and an activating agent, conducting activation through two-stage heating, and finally, washing with HCl and deionized water to obtain the barrier layer material. The method for preparing the soil heavy metal pollution barrier layer material is simple in process and low in production cost, two-stage heating is innovatively adopted, raw materials can be fully utilized, the barrier effect of a finished product is optimal, the specific surface area of the prepared barrier layer material is larger than 1000 m < 2 > / g, and the prepared barrier layer material has high heavy metal adsorption capacity and can be used for preparing the soil heavy metal pollution barrier layer material. And the adsorption is very stable. The invention further provides two using methods of the soil heavy metal pollution blocking layer material, the effect of blocking soil heavy metal pollution can be achieved by fully adjusting measures to local conditions, and wide application prospects are achieved.

Description

Technical field [0001] The present invention relates to the field of chemical materials, heavy metal pollution particularly relates to a soil barrier layer material and its preparation method and application. Background technique [0002] Many parts of my country there is a problem of heavy metal pollution of the soil, especially in the mining area, wash mine, tailings, slag pile site and other mining units, heavy metals will settle with natural rainfall, etc. into the soil, and heavy metals in soil will be cause serious pollution of land and groundwater, especially heavy metal free state soil, will spontaneously spread migration, or with groundwater further spread, leading to heavy metal in the vicinity of the land, surface water and other resources exceeded, harm agriculture and fishery production, endanger residents life health, causing incalculable damage. Therefore, the development of heavy metal for the barrier material is of great significance for my country's environmenta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08A01B79/02C05G3/00C05G3/40C05G3/80C05G3/90C09K101/00
CPCC09K17/40B09C1/08A01B79/02C05C9/02C05G3/00C05G3/40C05G3/80C05G3/90C09K2101/00C05D1/00C05D9/02
Inventor 周长凯苏长青马卫武李立清曾政
Owner CENT SOUTH UNIV
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