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Method for fixing soil heavy metal ion in situ by nanometer amorphous calcium phosphate

A technology of amorphous calcium phosphate and heavy metal ions, which is applied to in-situ fixation of heavy metal ions in soil, using nano-amorphous calcium phosphate to in-situ fix heavy metal ions in heavy metal-contaminated soil, which can solve the problem of low fixation efficiency of heavy metal ions, high repair costs, Phosphorus-containing materials are easy to lose and other problems, achieving high fixation efficiency, good repair effect, and improved repair effect

Inactive Publication Date: 2011-02-02
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for in-situ fixation of heavy metal ions in soil using nano-amorphous calcium phosphate with good effect, no secondary pollution and wide application range, which can overcome the in-situ fixation and repair of heavy metals with phosphorus-containing materials in the prior art The phosphorus-containing materials that exist in polluted soil are easy to lose, the fixation efficiency of heavy metal ions is low, and the repair cost is too high, so as to achieve cheap and efficient treatment of heavy metal polluted soil

Method used

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  • Method for fixing soil heavy metal ion in situ by nanometer amorphous calcium phosphate
  • Method for fixing soil heavy metal ion in situ by nanometer amorphous calcium phosphate

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Embodiment one: the preparation of nanometer amorphous calcium phosphate

[0023] Prepare 0.835 mol / L Ca(NO 3 ) 2 and 0.5 mol / L (NH 4 ) 2 HPO 4 solution, adjust the pH value to 10 with ammonia water, put (NH 4 ) 2 HPO 4 The solution was slowly added dropwise to the Ca(NO 3 ) 2 solution, while stirring with a magnetic stirrer, the resulting precipitate was freeze-dried for 24-72 hours to obtain nano-amorphous calcium phosphate, and its X-ray diffraction pattern is as follows: figure 1 shown.

Embodiment 2

[0024] Embodiment two: the preparation of nanometer amorphous calcium phosphate

[0025] Prepare 0.167 mol / L Ca(NO 3 ) 2 and 0.1 mol / L NaH 2 PO 4 solution, adjust the pH value to 11 with ammonia water, put NaH 2 PO 4 The solution was slowly added dropwise to the Ca(NO 3 ) 2 The solution is stirred with a magnetic stirrer at the same time, and the obtained precipitate is freeze-dried for 24-72 hours to obtain nanometer amorphous calcium phosphate.

Embodiment 3

[0026] Example 3: In situ fixation of lead-contaminated soil by nano-amorphous calcium phosphate

[0027] Take uncontaminated soil, by adding 500 mg / kg of Pb 2+ , made into simulated lead-contaminated soil, and carried out in situ fixation experiments. Add 0.2% and 0.4% nano-amorphous calcium phosphate powder to the soil respectively, and take the soil without adding nano-amorphous calcium phosphate fixative as the control (CK). Fully mix the soil and nano-amorphous calcium phosphate, and apply a certain amount of urea and potassium calcium chloride as base fertilizers, and put them into plastic pots, each pot is filled with soil equivalent to 2.0 kg of dry weight, and each treatment repeat three times. Sow pak choy after aging for 1 month. Irrigate with deionized water every day, and adjust the soil moisture to about 60% of the maximum water holding capacity in the field. The pakchoi were harvested after 60 days of growth, digested by nitric acid-perchloric acid method, ...

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Abstract

The invention discloses a method for fixing soil heavy metal ions in situ by nanometer amorphous calcium phosphate. According to the method, the nanometer amorphous calcium phosphate is applied to the heavy metal polluted soil the amount of which accounts for 0.1%-0.6% of the weight of water-free soil and then the mixture is fully and evenly blended. After being applied to the heavy metal polluted soil,the nanometer amorphous calcium phosphate can noticeably reduce biological effectiveness and mobility of the heavy metal in the soil by reactions with the heavy metal elements such as adsorption, coordination, precipitation and the like. The method of the invention has the advantages of low cost, simple use, high fixing efficiency to heavy metal and capability of improving soil fertility and realizing in-situ remediation without leading to secondary pollution, thus being a safe and effective method for remedying heavy metal polluted soil.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal pollution treatment, and relates to a method for in-situ fixing of soil heavy metal ions, in particular to a method for in-situ fixing of heavy metal ions in heavy metal-polluted soil by using nanometer amorphous calcium phosphate. Background technique [0002] Soil is the material basis for human survival and an indispensable and non-renewable natural resource for human beings. Soil heavy metal pollution is a phenomenon that human activities add heavy metals to the soil, resulting in soil heavy metal content significantly higher than its natural background content, and causing ecological damage and environmental quality deterioration. Soil heavy metal pollution, as a major category of soil pollution, seriously affects the quality of soil environment, and has the characteristics of concealment, irreversibility, and serious consequences. At the same time, because heavy metals cannot be de...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 魏正贵魏巍崔静徐旻王雪
Owner NANJING NORMAL UNIVERSITY
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