Thiolated bentonite for remedying heavy metal polluted soils and preparation method thereof

A technology for polluting soil and bentonite, applied in chemical instruments and methods, soil conditioning materials, organic fertilizers, etc., can solve the problems of high cost and high usage of 3-mercaptopropyltrimethoxysilane, and achieve low cost and good soil. The effect of passivation repair and simplified preparation process

Active Publication Date: 2017-08-04
CHENGDU UNIVERSITY OF TECHNOLOGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the existing bentonite mercapto group modification technology, there is a common problem that 3-mercaptopropyltrimethoxysilane is used in a large amount. The ratio of bentonite to modifier is basically 1:1, because 3-mercaptopropyltrimethoxysilane Silane is relatively expensive and is the most important cost of modified materials, accounting for more than 90% of the entire modified material preparation cost

Method used

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  • Thiolated bentonite for remedying heavy metal polluted soils and preparation method thereof
  • Thiolated bentonite for remedying heavy metal polluted soils and preparation method thereof
  • Thiolated bentonite for remedying heavy metal polluted soils and preparation method thereof

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preparation example Construction

[0038] The preparation method of mercapto bentonite: mix bentonite, ethanol solution of mercapto compound, sodium silicate and water to form a mixed solution, after stirring and reacting, wash, filter and dry to obtain mercapto bentonite; wherein, ethanol of mercapto compound The solution is prepared by dissolving the mercapto compound in ethanol, and the ethanol solution of the mercapto compound is prepared by a volume ratio of 1:19 to 99 between the mercapto compound and ethanol; since the mercapto reagents used in the present invention are few, the preferred mercapto compound and ethanol The volume ratio is 1:99.

[0039] Wherein, the bentonite may be calcium-based bentonite.

[0040]Since the greater the liquid-solid ratio of the mixed liquid, the worse the modification effect, and the greater the desorption rate, that is, the easier it is to be desorbed. Therefore, preferably, the liquid-solid ratio of the mixed liquid is 15-25mL:1g; A more preferred liquid-solid ratio o...

Embodiment 1

[0047] Example 1 Preparation of mercaptolated bentonite (1#), the mass ratio of bentonite raw soil to 3-mercaptopropyltrimethoxysilane is 1:0.05.

[0048] Weigh 2.00g of bentonite raw soil into a 100mL small beaker, add 10mL of 1% 3-mercaptopropyltrimethoxysilane ethanol solution and 0.12g of sodium silicate powder, add a certain amount of distilled water to make the solid-liquid ratio of the system 1g : 20mL, mix well, adjust the pH of the solution to be 9.50~10.00, stir and react at room temperature for 6h, wash with distilled water until neutral, filter with suction, dry at 40°C, grind and pass through 80 mesh sieve to obtain thiolated bentonite.

[0049] The infrared spectra of mercapto-based bentonite and bentonite calcium-based soil are shown in figure 1 . Depend on figure 1 It can be seen that compared with calcium-based bentonite (MMT), mercapto-bentonite (MMT-SH) has a C-H stretching vibration peak at 2900, and an S-H stretching vibration peak at 2560. The changes ...

Embodiment 2

[0051] Example 2 Preparation of mercaptolated bentonite (2#), the mass ratio of bentonite to 3-mercaptopropyltrimethoxysilane is 1:0.1.

[0052] Weigh 2.00g bentonite raw soil into a 100mL small beaker, add 10mL 2% 3-mercaptopropyltrimethoxysilane ethanol solution and 0.12g sodium silicate powder, add a certain amount of distilled water to make the solid-liquid ratio of the system 1g : 20mL, mix well, adjust the pH of the solution to be 9.50~10.00, stir and react at room temperature for 6h, wash with distilled water until neutral, filter with suction, dry at 40°C, grind and pass through 80 mesh sieve to obtain thiolated bentonite.

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Abstract

The invention relates to the technical field of heavy metal polluted soil controlling and remedying, and in particular relates to thiolated bentonite for remedying heavy metal polluted soils and a preparation method thereof. The preparation method comprises the steps of mixing bentonite, ethanol solution of 3-mercaptopropyl trimethoxy silane, sodium silicate with water, stirring, reacting, washing, filtering and drying to obtain the thiolated bentonite. The obtained thiolated bentonite is low in price, high in adsorption rate, low in desorption rate and large in adsorption capacity. The preparation method has the advantages that the using amount of thiol modifier is reduced by a large margin, so that the cost is reduced; and the modification is carried out on original bentonite, so that the modifying process is simplified.

Description

technical field [0001] The invention relates to the technical field of treatment and restoration of heavy metal-contaminated soil, in particular to a mercaptolated bentonite for repairing heavy metal-contaminated soil and a preparation method thereof. Background technique [0002] With the rapid development of industry, the problem of heavy metal pollution is becoming more and more serious. Due to its high toxicity and easy accumulation, it is difficult to remove once it enters the water body and soil environment, causing serious environmental heavy metal pollution problems. Therefore, the development of a cheap and efficient heavy metal adsorption material has become a hot issue in current research. Bentonite is rich in resources, cheap and easy to get, and has strong ion exchange capacity and adsorption performance, but its adsorption performance needs to be improved. Therefore, it is necessary to modify bentonite. [0003] In Zhang Yiping's "Study on the Adsorption Prope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/42C09K101/00
CPCC09K17/42C09K2101/00
Inventor 朱霞萍雷泞菲孟兴锐邢智赖波
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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