Passivation improver for heavy metal pollution farmland and using method thereof

A technology of improver and heavy metal, applied in the direction of chemical instruments and methods, restoration and application of polluted soil, etc., can solve the problems of poor passivation effect, easy decomposition, reduced bioavailability and mobility, etc., and achieve good passivation Improve the effect of restoration effect

Active Publication Date: 2014-09-10
爱土工程环境科技有限公司
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Problems solved by technology

[0003] The most commonly used method at present is the passivation method. The traditional research method is to add chemical substances such as slaked lime and calcium silicate to the soil. By adding these substances, precipitation, adsorption, ion exchange, humification and oxidation will occur with heavy metal elements. A series of reactions such as reduction, and then change the occurrence of heavy metals in Xingtai, significantly reduce their bioavailability and mobility, significantly slow down the toxic effect of heavy metal pollution on plant growth, and greatly reduce the absorption and accumulation of heavy metals by plants. However, most of these substances It is an inorganic substance, which affects the physical and chemical properties and fertility of the soil, affects the growth environment of microorganisms to varying degrees, and also affects the availability of the soil after the restoration is completed. Therefore, it is necessary to further search and study the in-situ restoration of heavy metal pollution that is friendly to the soil environmen

Method used

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  • Passivation improver for heavy metal pollution farmland and using method thereof
  • Passivation improver for heavy metal pollution farmland and using method thereof
  • Passivation improver for heavy metal pollution farmland and using method thereof

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[0041] The present invention also provides a method for preparing the above-mentioned porous spherical cellulose, which includes:

[0042] In the first step, take 1.4kg of NaOH, 2.6kg of urea and 15kg of water, mix them together, and stir evenly in a mixer to obtain a dispersion medium;

[0043] In the second step, 0.8kg of cotton pulp board was added to the above dispersion medium, and the above system was disintegrated with a mixer for 1 min, and then shaken with an ultrasonic oscillator for 30 min, and the cellulose solution was pre-cooled to -12°C, and the solution was heated at 8000r / min Under a high-speed mixer, dissolve for 10 min to obtain a cellulose solution;

[0044] In the third step, the cellulose solution prepared in the second step was centrifuged at a speed of 4000r / min for 10 minutes at room temperature to obtain a transparent cellulose solution, and 2.7% Span-80 was dissolved in liquid paraffin and stirred at a speed of 1000r / min After 30 minutes, the above cellul...

Example Embodiment

[0051] Example 1 Preparation of porous spherical cellulose

[0052] Take 1.4kg of NaOH, 2.6kg of urea and 15kg of water, mix them together, stir evenly in a mixer to obtain a dispersion medium; add 0.8kg of cotton pulp board to the above dispersion medium, and use a mixer to dissolve the above system for 1 min, then use ultrasonic vibration The instrument was oscillated for 30 minutes, and the cellulose solution was pre-cooled to -12°C. The solution was decomposed under a high-speed mixer at 8000r / min for 10 minutes to obtain a cellulose solution; the prepared cellulose solution was centrifuged at a speed of 4000r / min at room temperature. After soaking for 10 minutes, a transparent cellulose solution is obtained. Dissolve 2.7% Span-80 in liquid paraffin and stir for 30 minutes at 1000r / min. Add the above cellulose solution within 1h. The resulting suspension is stirred at 1000r / min and room temperature. Stir and emulsify for 5 hours. Under the above conditions, add 10% dilute hyd...

Example Embodiment

[0057] Example 2 Hydroxypropyl modified SiO 2 / Preparation of Chitosan Nanoparticles

[0058] Mix 2.5L of ethyl silicate, 5L of absolute ethanol and 5L of deionized water evenly, reflux and stir at 80℃ for 1h, then adjust the pH of the solution to 6 with acetic acid, continue to stir for 1h to make SiO 2 Sol, take 8g of epichlorohydrin acidified with HCl to a pH of 6, then add the SiO 2 The sol was dispersed with 50L of absolute ethanol to obtain a dispersion. The acidified epichlorohydrin was added dropwise to the dispersion, and the temperature was controlled at 40℃ to react for 7 hours. The solvent and unreacted epichlorohydrin were evaporated to obtain a white solid powder. , Vacuum drying at 50℃ for 6h to obtain hydroxypropylated SiO 2 , Disperse 2kg chitosan in 40L isopropanol, basify with 0.3kg sodium hydroxide at 40℃ for 3h, add 2.5kg hydroxypropylated SiO obtained above 2 , React at a constant temperature of 45℃ for 5h, cool, filter by suction, wash the filter cake with is...

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Abstract

The invention provides a passivation improver for a heavy metal pollution farmland and a using method of the passivation improver. The raw materials comprise coal ash, nano iron powder, zeolite, medical stone, calcium magnesium phosphate, hydroxypropyl modified SiO2/chitosan nanoparticles and porous spherical cellulose. According to the composite passivation improver, the passivation effect on heavy metals cadmium, lead, arsenic and chromium in soil can be improved, copper and zinc in soil are well passivated, and the soil remediation effect is improved.

Description

technical field [0001] The invention relates to the technical field of soil heavy metal passivation, in particular to a passivation improver for heavy metal polluted farmland and a use method thereof. Background technique [0002] The agricultural resource environment is not only an important material basis for agricultural production, but also directly related to the quality and safety of agricultural products, affecting human health, related to the frequency and intensity of agricultural disasters, and plays a decisive role in the sustainable development of agriculture and rural economy. role. With the aggravation of industrial and urban pollution and the increase in the types and quantities of agricultural chemicals, heavy metals discharged from industry, agriculture, and life continue to increase, and soil heavy metal pollution is becoming more and more serious. Heavy metals are currently the main pollutants in my country's farmland. In 1980, the area of ​​polluted farm...

Claims

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Application Information

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IPC IPC(8): C09K17/50B09C1/08C09K101/00
Inventor 周愈尧李娜魏斌曹强
Owner 爱土工程环境科技有限公司
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