Heavy metal adsorption and immobilization material, preparation method and application thereof

A technology for adsorption and immobilization of heavy metals, applied in applications, soil conditioning materials, chemical instruments and methods, etc., can solve the problems of poor adsorption effect of biomass charcoal, high cost of soil remediation, secondary pollution of chelating agents, etc., and achieve improved aggregate structure. and physical and chemical properties, reducing the risk of secondary pollution, high repeatability

Inactive Publication Date: 2019-09-20
NINGXIA UNIVERSITY
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Problems solved by technology

[0005] In view of this, it is necessary to provide a heavy metal adsorption and fixation material to solve the technical problems of high repair cost of heavy metal contaminated soil in the prior art, poor adsorption effect and poor selectivity of biochar, and secondary pollution easily caused by chelating agents

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  • Heavy metal adsorption and immobilization material, preparation method and application thereof
  • Heavy metal adsorption and immobilization material, preparation method and application thereof

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preparation example Construction

[0024] In a specific embodiment, a method for preparing the aforementioned heavy metal adsorption and fixation material is provided, comprising the following steps:

[0025] a. Obtain biochar.

[0026] Specifically, the raw material of biochar is selected, which can be animal husbandry waste biomass such as straw, rice husk, fruit shell and livestock manure, etc., or forestry waste biomass such as branches, bark, etc., or it can be Mixtures of the above substances. In this embodiment, waste wood is selected, such as apple branches or grape branches with wide sources and low cost, which can realize waste resource utilization at the same time. As the main fruit tree crops in Northwest my country, apples and grapes have a large planting area and high quality. However, a large number of apple branches and grape branches will be produced after pruning. These agricultural wastes are used in a resourceful and harmless manner to prepare Become biochar, used for pollution control, imp...

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Abstract

Belonging to the technical field of soil ecological restoration, the invention provides a heavy metal adsorption and immobilization material, a preparation method and application thereof. The heavy metal adsorption and immobilization material is formed by bonding biomass charcoal with a chelation group, and the chelation group at least comprises one of amino, carboxyl or sulfydryl. The preparation method includes the steps of: acquisition of biomass charcoal; surface epoxidation of biomass charcoal to prepare modified biomass charcoal; and bonding of the modified biomass charcoal with the chelation group. The heavy metal adsorption and immobilization material can be applied to remediation of heavy metal contaminated soil, and the synergistic effect of biomass charcoal's adsorption and the chelating agent's chelation is utilized to immobilize heavy metal ions in soil, the content of free heavy metal ions in the soil can be effectively reduced, and also the heavy metal ions can exist stably after being immobilized, and hardly diffuse in the water migration process, thus lowering the secondary pollution risk of heavy metal ions. At the same time, the heavy metal adsorption and immobilization material is conducive to improving the soil structure and maintaining the soil moisture and nutrients.

Description

technical field [0001] The invention belongs to the technical field of soil ecological restoration, and in particular relates to a heavy metal adsorption and fixation material, a preparation method and application thereof. Background technique [0002] Due to the continuous and rapid development of industry and agriculture, various industries discharge a large amount of heavy metal wastewater every year and enter the soil and water environment. However, some industrial wastewater has not been treated in a timely and effective manner before discharge, coupled with atmospheric deposition, sewage irrigation, fertilization on farmland and excessive use of herbicides, the pollution of heavy metals in the soil and water environment has become increasingly prominent. The existing engineering treatment methods or chemical treatment methods are not suitable for large-scale heavy metal pollution treatment due to the large amount of engineering, high cost, long repair time, and possibl...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C09K17/14B09C1/00B09C1/08
CPCB01J20/20B01J20/22B09C1/00B09C1/08C09K17/14
Inventor 杨帆王幼奇钟艳霞贺婧罗玲玲李欢
Owner NINGXIA UNIVERSITY
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