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Method for preparing in-situ passivation restoring material of soil heavy metal with copolycondensation method

A technology for repairing materials and heavy metals, applied in chemical instruments and methods, restoration of polluted soil, water pollutants, etc., can solve the problem of lack of stability of passivation material repair effect and insufficient understanding of environmental safety, compound pollution treatment of multiple elements The effect is not outstanding, affecting the physical and chemical properties of the soil, etc., to achieve the effect of no secondary pollution, little impact on the physical and chemical properties of the soil and fertility, and a wide range of applications

Inactive Publication Date: 2010-03-10
AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing passivation materials are mainly phosphorus-containing substances, lime and organic materials, etc., and the application amount is large, resulting in high cost, and may affect the physical and chemical properties of the soil, reducing soil fertility; in the restoration process, often single heavy metal The pollution effect is remarkable, but the treatment effect on multi-element compound pollution is not outstanding; there is a lack of research data from multi-season experiments and field experiments, and insufficient understanding of the stability of the remediation effect of passivation materials and environmental safety
These problems limit the popularization and application of in-situ passivation repair technology in soil heavy metal pollution control.

Method used

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  • Method for preparing in-situ passivation restoring material of soil heavy metal with copolycondensation method
  • Method for preparing in-situ passivation restoring material of soil heavy metal with copolycondensation method
  • Method for preparing in-situ passivation restoring material of soil heavy metal with copolycondensation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Preparation of soil heavy metal in-situ passivation repair material

[0021] 1) Measure 490g of deionized water and put it in a 2000ml beaker, add 210g of methanol and stir it electrically;

[0022] 2) Add template agent cetyltrimethylammonium bromide (CTAB) 15.31g and sodium hydroxide (NaOH) 3.84g under vigorous stirring conditions, and stir until they are completely dissolved; 3) Tetramethoxysilane ( TMOS) 38.05g and mercaptopropyltrimethoxysilane (MPTMS) 19.63g as the silicon source, transfer to a 100ml beaker and mix the two; 4) Mix the well-mixed tetramethoxysilane (TMOS) and mercaptopropyl Add trimethoxysilane (MPTMS) to the above solution and continue to stir for 12 hours; 5) After stopping the stirring, transfer the above solution to a constant temperature water bath at 96°C and heat for 12 hours; 6) Then transfer the reaction system to a Buchner funnel for suction filtration , collect the filter cake and dry to obtain the white powder primary produc...

Embodiment 2

[0024] Example 2: Application of passivation repair materials in water body lead and cadmium pollution control

[0025] Configure a series of different Pb 2+ 、Cd 2+ As a typical working solution of heavy metal polluted water, measure 50ml and place them in 100ml centrifuge tubes, weigh 0.05g of passivation repair agent and add them to the centrifuge tubes that have been added with heavy metal pollution working solution respectively. Passivation materials and sewage Ratio 1g / L, shake at constant temperature for 12h, take the supernatant after high-speed centrifugation, use atomic absorption spectrophotometer to measure the concentration of heavy metal ions in the solution, and calculate the heavy metal loading and Saturated load.

[0026]The results show that the passivation repair material has a good repair effect on lead and cadmium heavy metal pollution in the water body, and the results are as follows: Figure 1a and Figure 1b As shown, its adsorption isotherm conforms ...

Embodiment 3

[0027] Example 3: Kinetic detection of lead and cadmium pollution repaired by passivation repair materials

[0028] Prepare the concentration of 200mg / l Pb respectively 2+ solution and 100mg / l Cd 2+ Transfer 500ml of the solution to a 1000ml beaker, set the ratio of passivation material to dirty liquid to 1g / L, add 0.5g of passivation restoration agent accurately weighed under the condition of vigorous stirring, and start the timing, and take samples at different times after filter membrane filtration Measure the concentration of heavy metal ions, calculate the load of heavy metals, and calculate the relationship between time and load.

[0029] Such as figure 2 As shown, the results show that the passivation repair material reacts rapidly with heavy metal ions in the solution, reaching equilibrium within 20 minutes, and the response time is extremely short.

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Abstract

The invention relates to a method for preparing an in-situ passivation restoring material of soil heavy metal with a copolycondensation method. A cellular material with high specific surface area is prepared by using a mesoporous silicon dioxide SiO2 as the base material and introducing sulfydryl having strong bonding fixation ability with a heavy metal ion via surface modification. The preparation method comprises the following steps: (1) mixing water with methanol; (2) adding templates of hexadecyl trimethyl ammonium bromide and sodium hydroxide; (3) using methyl orthosilicate and mercapto-propyl trimethoxy silane as a silicon source; (4) continuously stirring the mixed solution for 12h; (5) heating the solution in water at a constant temperature of 96 DEG C; (6) obtaining white powder by filtering, collecting and air drying; and (7) transferring the mixture into a soxhlet extractor to be extracted by ethanol, collecting samples for air drying and performing vacuum drying at 80 DEG Cto obtain the finished product. The invention has the advantages of simple process, low cost, high restoring efficiency, no secondary pollution and safe use, and is suitable for large-scale promotionand application.

Description

technical field [0001] The invention relates to the preparation technology of soil heavy metal in-situ passivation restoration materials, in particular to a method for preparing soil heavy metal in-situ passivation restoration materials by a co-condensation method. technical background [0002] Heavy metals are currently the main pollutants in my country's farmland. In 1980, the area of ​​polluted farmland in China was 2.67×10 4 km 2 , 6.7×10 in 1988 4 km 2 In 1998, nearly 2×10 cultivated land was polluted by heavy metals such as cadmium, arsenic, lead, chromium and mercury. 5 km 2 , accounting for about 1 / 5 of the total cultivated land area, of which cadmium polluted 1.33×10 2 km 2 , involving 25 regions in 11 provinces; mercury pollution 3.2×10 2 km 2 , involving 21 regions in 15 provinces. In 2000, the former State Environmental Protection Administration sampled and monitored 300,000 hectares of basic farmland protection areas for harmful heavy metals in the soil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C02F1/62C02F101/20
Inventor 徐应明梁学峰王林孙扬秦旭
Owner AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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