Iron based-humus composite material and application thereof in soil heavy metal pollution control

A composite material and humus technology, which is applied to iron-based-humus composite materials and its application in soil heavy metal pollution control, can solve the problem that arsenic and cadmium composite pollutants are not adsorbed stably at the same time, do not use the high adsorption capacity of humus, and limit adsorption. capacity and other issues, to achieve the effect of accelerating soil microbial metabolism, conducive to healthy growth and low cost

Active Publication Date: 2015-10-14
中向旭曜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this patent application document reports an iron-containing curable arsenic humic compound additive material, from the perspective of its technical process, the required humic substances must be pure phase fulvic acid and humic acid, from conventional humic substances The technical process of extracting these two components is complicated; in addition, the iron-based precursor of the reaction is an iron salt solution, which can only be obtained by Fe after being combined with humic substances. 3+ The existence of structural forms, compared with iron oxide, limits the adsorption capacity of the material for arsenic; at the same time, the material only uses the strong complexation ability of iron and arsenic, and does not use the high adsorption capacity of humus itself. There is no effect of adsorption stability at the same time, especially for the reduction of arsenic availability in agricultural production, the pollution content is usually in the mg / kg level of arsenic content soil, whether it also has this performance needs further confirmation

Method used

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  • Iron based-humus composite material and application thereof in soil heavy metal pollution control
  • Iron based-humus composite material and application thereof in soil heavy metal pollution control
  • Iron based-humus composite material and application thereof in soil heavy metal pollution control

Examples

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Effect test

Embodiment 1

[0039] Embodiment 1: the preparation of iron base-humus composite material

[0040] The preparation of the iron-based-humus composite material of the present embodiment comprises the following steps:

[0041] (1) The zero-valent iron powder and the manganese dioxide powder that particle diameter is 50nm are mixed according to the ratio of mass ratio 1:1, then make the iron-manganese suspension of mass percent 10%; Iron-manganese suspension and mass percent 10 % humus aqueous suspension is mixed according to the volume ratio of 1:5, and then the mixed solution is stirred and reacted in a mixer for 4.0h;

[0042] Wherein the humus is the humus extracted from peat soil by the NaOH extraction method launched by the International Humus Association;

[0043] Centrifuge the reacted sample, remove the upper aqueous solution, and retain the solid matter; the solid matter is washed with distilled water for 3 times, dried at 40°C, and pulverized;

[0044] (2) Mix the product obtained i...

Embodiment 2

[0050] Embodiment 2: the preparation of iron base-humus composite material

[0051] The preparation of the iron-based-humus composite material of the present embodiment comprises the following steps:

[0052] (1) The zero-valent iron powder and the manganese dioxide powder that particle diameter is 500nm are mixed according to the ratio of mass ratio 1:0.5, then make the iron-manganese suspension of mass percentage 10%; % humus aqueous suspension is mixed according to the volume ratio of 1:5; then the mixed solution is stirred and reacted in a mixer for 1.5h;

[0053] Wherein the humus is the humus extracted from peat soil by the NaOH extraction method launched by the International Humus Association;

[0054] Centrifuge the reacted sample, remove the upper aqueous solution, and retain the solid matter; the solid matter is washed with distilled water for 3 times, dried at 60°C, and pulverized;

[0055] (2) Mix the product prepared in step (1) with 10wt% polyvinylpyrrolidone s...

Embodiment 3

[0060] Example 3: Adsorption experiment of trivalent arsenic, pentavalent arsenic and cadmium ions by iron-based-humic substance composite material

[0061] The iron-based-humus composite material of this embodiment adsorbs and removes arsenic and cadmium. The specific steps are as follows:

[0062] (1) Weigh 0.15g of the iron-based-humus composite material C with an iron loading of 4.7% obtained in Example 1 and add it to a 15mL centrifuge tube, add 2 ), 10mg / L (NaAsO 3 ) and 20mg / L (CdNO 3 ) Mixed solution 15mL, determine the number of reaction centrifuge tubes that need to be arranged according to the number of samples taken and repeated samples;

[0063] (2) Oscillate the mixed reaction solution on a horizontal shaker under dark conditions;

[0064] (3) After the reaction was carried out for 10, 20, 40, 80, 120, and 240 minutes, three reaction samples were taken out and centrifuged; after the supernatant was diluted to an appropriate multiple, the concentration of the t...

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Abstract

The invention discloses an iron based-humus composite material and an application thereof in soil heavy metal pollution control. The iron based-humus composite material is prepared by the following steps: firstly, mixing zero-valent iron and manganese dioxide to obtain an aqueous suspension, then mixing the aqueous suspension with a humus suspension according to the proportion, carrying out stirring reaction for a period of time, then carrying out solid-liquid separation, drying and crushing the solid matter, then adding a certain amount of an activator solution, activating, carrying out stirring reaction, then carrying out solid-liquid separation again, and drying and crushing the solid matter to obtain the composite material. The composite material is simple in preparation process, low in production cost, and short in production cycle; a soil heavy metal pollution control method is simple to operate, does not take up farming time, and can be applied on large scale. The composite material has a unique role in arsenic and cadmium composite pollution soil, can reduce the effectiveness of arsenic and cadmium in the soil at the same time, can significantly decrease the arsenic and cadmium content in agricultural products planted in the arsenic and cadmium composite pollution soil, and ensures safe production of the agricultural products.

Description

technical field [0001] The invention belongs to the field of remediation of heavy metal polluted soil, and in particular relates to an iron-based-humus composite material and its application in soil heavy metal pollution control. Background technique [0002] Soil heavy metal pollution is a prominent soil environmental problem that affects the safe production of agricultural products and human health. In soil heavy metal pollution, arsenic and cadmium compound pollution has certain particularity, which is a difficult point in the treatment of heavy metal polluted soil. Statistics show that about one-sixth of my country's farmland is subject to varying degrees of arsenic-cadmium compound pollution, especially in farmlands in mining-intensive areas, where the problem of arsenic-cadmium compound pollution is particularly serious. Wastewater discharge from mining and smelting activities in the ore concentration area, waste slag and tailings sand are naturally weathered and rain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 刘承帅李芳柏童辉刘传平陈曼佳于焕云
Owner 中向旭曜科技有限公司
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