Organic matter/mineral complex and preparation method thereof

A composite and organic technology, applied in inorganic chemistry, chemical instruments and methods, silicon compounds, etc., can solve problems such as no successful reports, and achieve the effect of safe and feasible preparation process, good usability and stable performance

Inactive Publication Date: 2009-06-03
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there is no successful report on making composites of inorganic substances such as bentonite and organic substances such as pig manure for soil passivation restoration technology.

Method used

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  • Organic matter/mineral complex and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Change the weight ratio of pig manure and sodium bentonite to prepare composites respectively.

[0021] According to the preparation process of pig manure degradation liquid, the preparation process of organic-inorganic complex and the equipment used, the complex is prepared, and the pH of the system is selected to be 7, the room temperature is 25 ° C, and the stirring time is 2.5 hours. Only pig manure is changed each time. , The weight ratio of sodium-based bentonite is 1:6, 1:5, 1:4, 1:3, 1:2 or 1:1 respectively, and the organic-inorganic compound is carried out, and the obtained product has the ability to resist the heavy metal Cu 2+ The adsorption removal rate of the standard determines the weight ratio of the best pig manure and sodium bentonite. The results show that: with the weight ratio of pig manure and sodium bentonite gradually increasing, the prepared organic-inorganic composite has a greater effect on Cu 2+ The removal rate is gradually increas...

Embodiment 2

[0022] Example 2: Change the reaction time to prepare complexes respectively.

[0023] Prepare the complex according to the preparation process of the pig manure degradation solution and the preparation process of the organic-inorganic complex. Select dry pig manure: sodium bentonite = 1:3, the pH of the reaction system = 7, and the reaction temperature is 25 ° C. Change the reaction time respectively For 0.5, 1, 1.5, 2, 2.5 or 3h, organic-inorganic composite is carried out, and the obtained product is resistant to heavy metal Cu 2+ The adsorption and removal rate of the standard determines the optimal reaction time; the results show that: with the increase of the organic-inorganic composite reaction time, the prepared organic-inorganic composite is resistant to the heavy metal Cu 2+ The adsorption removal rate increases gradually, and after 2.5 hours of reaction, the removal rate tends to be balanced, and the removal rate reaches 96.41%, that is, the reaction time of 2.5 hour...

Embodiment 3

[0024] Example 3: Change the pH of the reaction system to prepare complexes respectively.

[0025] Prepare the complex according to the preparation process of pig manure degradation solution and the preparation process of organic-inorganic complex. At room temperature 25 ° C, stirring time is 2.5h, pig manure: sodium bentonite = 1: 3, use sodium hydroxide and hydrochloric acid respectively Adjust the pH of the system to 3, 5, 7, 9 or 11, and carry out organic-inorganic compounding respectively, and the obtained product is resistant to heavy metal Cu 2+ The adsorption and removal rate was determined by the standard to determine the pH value of the optimal composite system. The results showed that: when the system was neutral or slightly alkaline, the prepared organic-inorganic composite 2+ The removal rate of montmorillonite is the highest, because the surface of montmorillonite is positively charged in acidic aqueous medium, which has a repelling effect on the cations with lar...

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Abstract

The invention relates to the technical field of remediation of heavy metal polluted soil by in situ passivation, particularly to an organic matter/mineral complex and a preparation method thereof. In the complex, the mineral is sodium bentonite, and the organic matter is pig manure and degradation liquid thereof; the solvent includes hydrochloric acid, sodium hydroxide, copper sulfate and silver nitrate; and the weight ratio of the organic matter and the mineral is 1:(1-6). The preparation method comprises the steps of adding water-wetted dry pig manure into effective microorganism (EM) liquid, culturing at 25DEG C for 30 days, centrifuging, collecting supernatant, filtering to obtain degradation liquid, adding buffered degradation liquid into slurry form sodium bentonite, preparing into 10% suspension, adjusting pH value to 3-11, allowing reaction under controlled temperature for 0.5-3 h, cooling, centrifuging, collecting sediment, and air-drying. The complex has the advantages of simple principle, safe and feasible preparation method, stable product properties, and good usability; and can be widely used for remediation of various kinds of soil by passivation.

Description

Technical field: [0001] The invention relates to an organic and inorganic compound used in the field of in-situ passivation restoration technology for heavy metal polluted soils and a preparation method thereof. Background technique: [0002] At present, due to the long-term use of chemical fertilizers and various pesticides in the soil of agricultural land, coupled with water pollution, the content of heavy metals in the soil is complicated, which affects the agricultural performance and quality of the soil. For a long time, the search for an in-situ passivation technology for repairing soil has attracted more and more attention from relevant departments and experts. Improvement of soil quality and agricultural development in our country. [0003] Bentonite (Bentonite) is usually associated with many minerals, with Montmorillonite (Montmorillonite) as the main component of clay mineral inorganic matter. The characteristics of montmorillonite determine the basic properties...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/44B09C1/08
Inventor 成杰民杨霞
Owner SHANDONG NORMAL UNIV
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