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Soil heavy metal ion absorbent and preparation method thereof

A technology of heavy metal ions and adsorbents, applied in chemical instruments and methods, restoration of polluted soil, and other chemical processes, etc., can solve problems such as high heavy metal content, and achieve the effect of ensuring quality and safety, reducing heavy metal content and reducing migration.

Inactive Publication Date: 2015-03-04
INST OF QUALITY STANDARD & DETECTION TECH YUNNAN ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the safety problem that the heavy metal content of regional agricultural products exceeds the national food hygiene standard limit due to the relatively high background value of soil heavy metals or sewage irrigation in the original agricultural product planting management mode

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  • Soil heavy metal ion absorbent and preparation method thereof
  • Soil heavy metal ion absorbent and preparation method thereof
  • Soil heavy metal ion absorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1 Soil heavy metal ion adsorbent of the present invention and preparation method thereof

[0044] A soil heavy metal ion adsorbent according to the present invention is made by mixing the following three groups of materials A, B and potassium humate in a ratio of A:B:potassium humate in a ratio of 2:5:3:

[0045] (1) Group A materials are modified corn stalks, and the modified corn stalks are prepared by the following method:

[0046] ①Collection and pretreatment of straw

[0047] Collect the fresh stalks above the roots of the harvested corn plants, cut them into sections, rinse the soil and dust attached to the surface of the stalks with clean water, put them in a cool place to dry naturally, and then put them in a constant temperature oven at 50°C to dry to a constant temperature. Crushed after weighting or drying in natural sunlight to constant weight, then pulverized, and passed through a 3-mesh sieve to obtain straw particles;

[0048] ② straw modific...

Embodiment 2

[0056] Example 2 Adsorption application of the soil heavy metal ion adsorbent of the present invention on different soil types.

[0057] 1. Experimental test materials

[0058] 1.1 Test soil

[0059] The soil for the adsorption test was collected from three different locations and different types of cultivated soil in Yunnan Province. After the soil samples were collected and dried naturally, they were ground and prepared for the detection of soil heavy metals and physical and chemical properties. The basic conditions of the tested soils are shown in the table below:

[0060] Table 1 Basic conditions of the tested soils

[0061]

[0062] 1.2 Experimental setup and heavy metal reagents

[0063] Table 2 The heavy metal reagents and the amount added in the adsorption test

[0064]

[0065] 1.3 Experimental method

[0066] Two groups were prepared for the adsorption test, one was control (CK) and the other was treatment. For the control group, 1.00 g of three soil samp...

Embodiment 3

[0081] Example 3 The cultivation application of the soil heavy metal ion adsorbent of the present invention to reduce the heavy metal content of corn grains in heavy metal polluted soil.

[0082] 1. Experimental test materials

[0083] 1.1 Test soil

[0084]The test soil was collected from moderately heavy metal-polluted soil in Gejiu City, Yunnan Province. The basic physical and chemical properties of the soil are shown in Table 5:

[0085] Table 5 Basic conditions of the tested soils

[0086]

[0087] 1.2 Trial crops: There are three main varieties of green food corn grown in Gejiu City, named Jiadan 108, Hongdan 3 and Kebainuo 8.

[0088] 2. Test method

[0089] A potted experiment on corn planting in heavy metal-polluted soil was set up in Gejiu City. All the test soil was taken from the corn planting land in Guan Yulin, Zhangjiazhai Village, Datun Town, Gejiu City. Experimental arrangement Three varieties, two soil treatments, three repeated experimental design. T...

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Abstract

The invention discloses a soil heavy metal ion absorbent and a preparation method thereof. The soil heavy metal ion absorbent is prepared by mixing modified corn straws, modified kaolin and potassium humate in a mass ratio of 2 to 5 to 3; the modified corn straws are mainly formed by drying, alkali treatment, acid treatment and drying; the modified kaolin is mainly formed by adding sodium polyphosphate and then roasting. The soil heavy metal ion absorbent disclosed by the invention can be used for obviously enhancing the absorption capability of soil to heavy metal and reducing the migration of the heavy metal in the soil to crops. Tests show that the average lead reducing rate in corn kernels is 15.63%, the average cadmium reducing rate in the corn kernels is 12.15%, and the average arsenic reducing rate in the corn kernels is 7.62%. The average lead reducing rate in rice is 17.8%, the average cadmium reducing rate in the rice is 17.27%, and the average arsenic reducing rate in the rice is 21.84%, and the quality of edible part of the crops is guaranteed.

Description

technical field [0001] The invention relates to the technical field of planting for soil heavy metal pollution restoration and agricultural product safety production quality control. technical background [0002] With the development of industrialization in recent decades, the leachate of wastewater and solid waste produced by various industries such as mining, metallurgy, and chemical industry directly enters the water body, and enters with the distribution of water systems and the needs of agricultural irrigation water. farmland environment. Soil is the direct carrier of agricultural product production. Chemical substances in soil are absorbed by crops and enter agricultural products during agricultural production. Whether the soil is polluted and the degree of pollution directly affects the quality and yield of agricultural products (Edited by Zhou Qixing. Healthy Soil Science-Soil Health Quality and Safety of Agricultural Products. 2005, Beijing: Science Press), therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30B09C1/00
CPCB01J20/12B01J20/24B09C1/00
Inventor 米艳华黎其万陈璐汪禄祥尹本林
Owner INST OF QUALITY STANDARD & DETECTION TECH YUNNAN ACAD OF AGRI SCI
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