Hexavalent chromium contaminated soil remediation agent and preparation method thereof

A technology of contaminated soil and remediation agents, applied in the field of soil remediation, can solve problems such as secondary pollution, loss of soil fertility, unsuitable for plant growth, etc., and achieve the effects of preventing coagulation, increasing the proportion of soil organic carbon content, and being suitable for crop growth

Inactive Publication Date: 2019-06-21
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used chromium repair agents include ferrous sulfate, zero-valent iron and calcium polysulfide, etc., but these agents generally have secondary pollution, soil fertility disappears after repair, and are not suitable for plant growth. Therefore, there is an urgent need for a green, Low-cost chromium pollution remediation agent

Method used

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  • Hexavalent chromium contaminated soil remediation agent and preparation method thereof
  • Hexavalent chromium contaminated soil remediation agent and preparation method thereof
  • Hexavalent chromium contaminated soil remediation agent and preparation method thereof

Examples

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preparation example Construction

[0036] Please refer to figure 1 , the embodiment of the present invention also provides the preparation method of above-mentioned hexavalent chromium contaminated soil remediation agent, comprises the following steps:

[0037] Step S1, weighing 8 to 9 parts of the ferric reagent in parts by mass, stirring and dissolving in pure water, and preparing a ferric solution with a ferric ion concentration of 0.1 to 0.5 mol / L for use;

[0038] Step S2, weighing 24 to 25 parts of tea polyphenol extract in parts by mass, stirring and dissolving in pure water, and preparing a tea polyphenol solution with a concentration of 15 to 30 g / L for use;

[0039] Step S3, weighing 1 part of polyvinyl alcohol in parts by mass, and then dissolving it in hot water to obtain a polyvinyl alcohol solution, which is cooled and set aside;

[0040] Step S4, synthesizing the repair agent: slowly drop the tea polyphenol solution into the ferric iron solution under stirring, so that the tea polyphenol solutio...

Embodiment 1

[0043] Weigh 8g of ferric nitrate, stir and dissolve in 100mL of pure water, and prepare ferric nitrate solution with ferric ion concentration of 0.33mol / L for later use; weigh 24g of tea polyphenol extract, stir and dissolve in 1000mL of pure water , to be prepared into a tea polyphenol solution with a concentration of 24g / L for use; weigh 1g of polyvinyl alcohol, then dissolve it in hot water to obtain a polyvinyl alcohol solution, and cool it for use; Slowly drop tea polyphenol solution into the solution to fully react the tea polyphenol solution and ferric nitrate solution; when the tea polyphenol solution and ferric nitrate solution have reacted completely, then add polyvinyl alcohol solution dropwise to obtain hexavalent chromium-contaminated soil remediation potion.

[0044] In Example 1, it is 1 part per 1 g.

Embodiment 2

[0046] Weigh 8.5g ferric chloride hexahydrate, stir and dissolve in 200mL pure water, and prepare a ferric chloride solution with a ferric ion concentration of 0.16mol / L for use; weigh 24.5g tea polyphenol extract, Stir and dissolve in 1500mL pure water, prepare a tea polyphenol solution with a concentration of 16.3g / L, and stand-by; weigh 1g of polyvinyl alcohol, and then dissolve it in hot water to obtain a polyvinyl alcohol solution, which will be used after cooling; Under the stirring state, slowly drop the tea polyphenol solution into the ferric chloride solution to fully react the tea polyphenol solution and the ferric chloride solution; alcohol solution to obtain hexavalent chromium-contaminated soil remediation agent.

[0047] In Example 2, it was 1 part per 1 g.

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Abstract

The invention provides a hexavalent chromium contaminated soil remediation agent. The remediation agent comprises the following raw materials in parts by mass: 24-25 parts of a tea polyphenol extract,8-9 parts of a trivalent iron reagent and 1 part of polyvinyl alcohol. The invention also provides a preparation method of the hexavalent chromium contaminated soil remediation agent. The method comprises the following steps: weighing the trivalent iron agent, and stirring and dissolving the agent in pure water to obtain a ferric iron solution; weighing the tea polyphenol extract, and stirring and dissolving the extract in pure water to obtain a tea polyphenol solution; weighing and dissolving polyvinyl alcohol in pure water to obtain a polyvinyl alcohol solution; dropwise adding the tea polyphenol solution to the prepared ferric iron solution during stirring to enable the tea polyphenol solution and the ferric iron solution to be subjected to sufficient reaction, and dropwise adding thepolyvinyl alcohol solution to obtain the hexavalent chromium contaminated soil remediation agent after sufficient reaction of the tea polyphenol solution and the ferric iron solution. After the prepared soil remediation agent is used for remediating soil, the pH value of soil is restored from strong alkalinity to neutrality, the proportion of organic carbon content of soil is increased, and the soil structure and fertility are improved.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a hexavalent chromium-contaminated soil remediation agent and a preparation method thereof. Background technique [0002] Metal chromium and chromium salts are very important industrial raw materials, and are widely used in various industries such as electroplating, pigments, ceramics, leather, catalysis, printing and dyeing, advanced alloy materials, spices, anti-corrosion, and medicine. In my country, the annual demand for metal chromium and chromium salts is more than 200,000 tons. As of 2003, there were 25 enterprises in my country that directly produced dichromate, distributed in 16 provinces and cities, with an annual production capacity of about 300,000 tons and a total output of about 230,000 tons. In recent years, the annual growth rate of China's chromium salt consumption has exceeded 10%, and China has become a major producer of chromium salt in the world. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C02F1/62C02F101/22C09K101/00C09K109/00
Inventor 夏新星张玲马腾苏春利王斌蒋佳毅徐倩
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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