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Preparation method of thiolated chitosan nano modified attapulgite soil passivator

A thiolated chitosan and chitosan modification technology, applied in chemical instruments and methods, restoration of polluted soil, soil conditioning materials, etc., can solve the problems of passivation group load, lack of adsorption effect, etc. The effect of increasing the residual content, improving the passivation effect, and low preparation cost

Inactive Publication Date: 2019-03-08
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In the above-mentioned prior art, it is all about the research on the preparation of soil passivation agent. However, through the above-mentioned mixed soil passivation agent, the passivation group is not loaded to the passivator, and the passivation of heavy metals in the soil has an adsorption effect. What is lacking

Method used

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  • Preparation method of thiolated chitosan nano modified attapulgite soil passivator
  • Preparation method of thiolated chitosan nano modified attapulgite soil passivator
  • Preparation method of thiolated chitosan nano modified attapulgite soil passivator

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Embodiment 1

[0034] (1) Uniformly mix 30 g of attapulgite, 3 g of chitosan, 0.1 g of sodium alkylaryl sulfonate, and 400 mL of deionized water, and disperse ultrasonically for 15 minutes to obtain a suspension;

[0035] Pour the suspension into a polytetrafluoroethylene reactor, react in a high-temperature furnace at 180°C for 24 hours, cool to room temperature, and centrifuge the product, wash it with 10% ethanol and deionized water three times, and then filter it with suction. Dry in an oven at 80°C for 1 hour, grind through a 200-mesh sieve, and the solid part is chitosan-modified attapulgite.

[0036] (2) Evenly mix 20 g of chitosan-modified attapulgite with 150 mL of thioglycolic acid, add 2 mL of concentrated sulfuric acid as a catalyst, shake in a water bath at 40 ° C for 24 h, centrifuge, wash with deionized water until the filtrate is neutral, and then Wash with a small amount of ethanol, dry at 40°C for 3 hours, and grind through a 200-mesh sieve to obtain a mercapto-chitosan nan...

Embodiment 2

[0043] (1) Uniformly mix 40 g of attapulgite, 5 g of chitosan, 0.12 g of sodium alkylaryl sulfonate, and 500 mL of deionized water, and ultrasonically disperse for 15 minutes to obtain a suspension;

[0044] Pour the suspension into a polytetrafluoroethylene reactor, react in a high-temperature furnace at 200°C for 20 hours, cool to room temperature, and centrifuge the product, wash it with 10% ethanol and deionized water three times, and then filter it with suction. Dry in an oven at 100°C for 80 minutes, grind through a 200-mesh sieve, and the solid part is chitosan-modified attapulgite.

[0045] (2) Evenly mix 10 g of chitosan-modified attapulgite with 50 mL of thioglycolic acid, add 1 mL of concentrated sulfuric acid as a catalyst, shake in a water bath at 50 ° C for 20 h, centrifuge, wash with deionized water until the filtrate is neutral, and then Wash with a small amount of ethanol, dry at 40°C for 2 hours, and grind through a 200-mesh sieve to obtain a thiolated chitos...

Embodiment 3

[0049] (1) Uniformly mix 30 g of attapulgite, 4 g of chitosan, 0.1 g of fatty alcohol polyoxyethylene ether, and 500 mL of deionized water, and ultrasonically disperse for 15 minutes to obtain a suspension;

[0050] Pour the suspension into a polytetrafluoroethylene reactor, react in a high-temperature furnace at 200°C for 20 hours, cool to room temperature, and centrifuge the product, wash it with 10% ethanol and deionized water three times, and then filter it with suction. Dry in an oven at 100°C for 80 minutes, grind through a 200-mesh sieve, and the solid part is chitosan-modified attapulgite.

[0051] (2) Evenly mix 10 g of chitosan-modified attapulgite with 50 mL of thioglycolic acid, add 1 mL of concentrated sulfuric acid as a catalyst, shake in a water bath at 50 ° C for 20 h, centrifuge, wash with deionized water until the filtrate is neutral, and then Wash with a small amount of ethanol, dry at 40°C for 2 hours, and grind through a 200-mesh sieve to obtain a thiolate...

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Abstract

The invention discloses a preparation method of a thiolated chitosan nano modified attapulgite soil passivator and relates to the technical field of soil remediation materials. The method comprises the steps as follows: mixing three substances including chitosan, attapulgite and a surfactant, adding deionized water after mixing, performing ultrasonic dispersion and uniform mixing to obtain a suspension, transferring the suspension into a polytetrafluoroethylene reactor for a reaction, cooling a product to room temperature, and performing centrifugation, drying and grinding to prepare chitosanmodified attapulgite; after mixing the chitosan modified attapulgite with thioglycollic acid, adding a catalyst, conducting an oscillation reaction in a constant-temperature water bath under shieldingof nitrogen, and performing centrifugation, washing, drying and grinding to obtain the thiolated chitosan nano modified attapulgite soil passivator. The preparation method of the thiolated chitosan nano modified attapulgite soil passivator has the benefits and advantages that the preparation method is simple, has a good passivation effect and does not change physical and chemical properties of soil.

Description

technical field [0001] The invention relates to the technical field of soil restoration materials, in particular to a preparation method of a mercapto-chitosan nano-modified attapulgite soil passivation agent. Background technique [0002] Heavy metals generally exist in nature in natural concentrations. However, due to the increasing activities of human mining, smelting, processing and commercial manufacturing of metal minerals, many heavy metals such as lead, mercury, cadmium, copper, zinc, etc. have entered the atmosphere, water, etc. , soil and other environmental media, causing serious environmental pollution. Heavy metals such as copper, cadmium, lead, and zinc often coexist in polluted soil, cannot be degraded by microorganisms, physical, chemical and other processes, and have the characteristics of accumulation and transmission through the biological chain, which are harmful to groundwater, agricultural production, and human health. It causes serious harm, and at th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08C08B37/08
CPCB09C1/08C08B37/003C09K17/40
Inventor 周广柱化春雨周润声王翠珍王月曹译允
Owner SHANDONG UNIV OF SCI & TECH
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