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Preparation method of iron-sulfur-rich carbon-based modifier for repairing cadmium-polluted rice field

A technology for improving agent and cadmium pollution, which is applied in the field of preparation of iron-rich carbon-based improving agent, which can solve the problems of difficult to effectively control the effectiveness of cadmium and reduce the absorption of cadmium in rice, so as to increase stability and retention and promote activation , promote the effect of synergistic effect

Pending Publication Date: 2022-07-15
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is still difficult to effectively control the availability of cadmium in the whole growing season of rice by only using the lime effect and sulfur-rich characteristics of carbon-based amendments during the flooding-drainage process of rice fields, that is, it is impossible to effectively reduce the availability of cadmium in the whole growth cycle of rice. Cadmium uptake, especially during the paddy field drainage phase

Method used

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  • Preparation method of iron-sulfur-rich carbon-based modifier for repairing cadmium-polluted rice field
  • Preparation method of iron-sulfur-rich carbon-based modifier for repairing cadmium-polluted rice field
  • Preparation method of iron-sulfur-rich carbon-based modifier for repairing cadmium-polluted rice field

Examples

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Effect test

Embodiment 1

[0026] A preparation method of an iron-rich sulfur carbon-based modifier for repairing cadmium-polluted paddy fields, comprising the following steps:

[0027] (1) Wash and dry the rape straw and grind it into powder, then add the biomass powder to 1 mol / L sodium hydroxide solution at a solid-to-liquid ratio of 1:10, mix evenly, heat to 90°C, and keep the temperature for 60min , filtered after cooling to obtain the biomass raw material after desiliconization;

[0028] (2) add ferrous sulfate heptahydrate to the biomass raw material after desiliconization, the consumption of described ferrous sulfate heptahydrate accounts for 5% of the biomass raw material weight after desiliconization, mix well and under nitrogen protection with 5% The heating rate of ℃ / min was heated to 350 ℃, and the temperature was kept for 30 minutes, and then cooled to room temperature in an oxygen-free environment protected by nitrogen to obtain an iron-rich sulfur carbon-based modifier.

[0029] The pH ...

Embodiment 2

[0031] A preparation method of an iron-rich sulfur carbon-based modifier for repairing cadmium-polluted paddy fields, comprising the following steps:

[0032] (1) Wash and dry the garlic straw and grind it into powder, then add the biomass powder to 1 mol / L sodium hydroxide solution at a solid-to-liquid ratio of 1:12, mix it evenly, heat it to 90°C, and keep the temperature for 80 minutes. , filtered after cooling to obtain the biomass raw material after desiliconization;

[0033] (2) add ferrous sulfate heptahydrate to the biomass raw material after desiliconization, the consumption of described ferrous sulfate heptahydrate accounts for 5% of the biomass raw material weight after desiliconization, mix well and under nitrogen protection with 10% The heating rate of ℃ / min was heated to 550 ℃, and the temperature was kept for 60 min, and then cooled to room temperature in an oxygen-free environment protected by nitrogen to obtain an iron-rich sulfur carbon-based modifier.

[00...

Embodiment 3

[0036] A preparation method of an iron-rich sulfur carbon-based modifier for repairing cadmium-polluted paddy fields, comprising the following steps:

[0037](1) Wash and dry the garlic straw and grind it into powder, then add the biomass powder to 1 mol / L sodium hydroxide solution at a solid-to-liquid ratio of 1:13, mix evenly, heat to 80°C, and keep the temperature for 60min , filtered after cooling to obtain the biomass raw material after desiliconization;

[0038] (2) add ferrous sulfate heptahydrate to the biomass raw material after desiliconization, the consumption of described ferrous sulfate heptahydrate accounts for 10% of the biomass raw material weight after desiliconization, mix well and under nitrogen protection with 10% The heating rate of ℃ / min was heated to 450 ℃, and the temperature was kept for 60 minutes, and then cooled to room temperature in an oxygen-free environment protected by nitrogen to obtain an iron-rich sulfur carbon-based modifier.

[0039] The ...

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Abstract

The invention relates to a preparation method of an iron-sulfur-rich carbon-based modifier for repairing a cadmium-polluted rice field, which comprises the following steps: cleaning sulfur-rich waste biomass, airing, grinding into powder, adding into a sodium hydroxide solution, uniformly mixing, heating to 60-90 DEG C, keeping the temperature for 30-90 minutes, cooling, and filtering to obtain a desiliconized biomass raw material, thereby obtaining the iron-sulfur-rich carbon-based modifier for repairing the cadmium-polluted rice field. And adding ferrous sulfate heptahydrate, uniformly mixing, heating and carbonizing under the protection of nitrogen, and finally cooling to room temperature to obtain the iron-sulfur-rich carbon-based modifier. According to the method disclosed by the invention, the sulfur-rich waste biomass can be safely and effectively recycled, and the coupling of carbon-based sulfur and exogenous iron can be promoted by desiliconizing the sulfur-rich biomass, so that the synergistic effect of carbon-based sulfur and iron on cadmium passivation is promoted. The carbon-based modifier prepared by the method has an excellent repairing effect on the cadmium-polluted rice field, particularly can promote formation of stable-state cadmium in a rice field flooding-drainage process, and can effectively prevent cadmium absorption of rice.

Description

technical field [0001] The invention relates to the technical field of environmental pollution control and agricultural product quality and safety, in particular to a preparation method of an iron-sulfur-rich carbon-based improver for repairing cadmium-contaminated paddy fields. Background technique [0002] With the rapid development of industry and agriculture, soil heavy metal pollution has become a large-scale and high-density environmental problem. my country's cultivated land pollutants are dominated by heavy metals, among which cadmium is the main heavy metal pollution element, and its point exceeding rate is as high as 7.0%. Rice is the food crop with the largest planting area and the highest unit yield in my country, and it is also the cereal crop with the strongest absorption of heavy metals. Most of the rice has super-accumulation ability for cadmium. However, there is a serious cadmium pollution problem in rice fields in my country. The survey showed that the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/04C05G3/00A01N59/16A01N59/02A01P21/00C09K101/00C09K109/00
CPCC09K17/04C05D9/00C05G3/00A01N59/16A01N59/02C09K2101/00C09K2109/00C05D9/02
Inventor 隋凤凤崔立强全桂香严金龙
Owner YANCHENG INST OF TECH