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Modified attapulgite preparation method

A technology for modifying attapulgite and attapulgite, which is applied in chemical instruments and methods, restoration of polluted soil, and other chemical processes, and can solve problems such as small amount of sulfhydryl groups, increased cost, and influence on adsorption effect, and achieves Improve adsorption selectivity, reduce treatment cost, and prevent secondary pollution

Inactive Publication Date: 2016-02-03
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the content of Si element on montmorillonite is small, which will inevitably lead to a small number of combined sulfhydryl groups and affect the adsorption effect, and the group used for adsorption is only sulfhydryl groups, which will inevitably lead to a large amount of use of adsorbents and increase the cost.

Method used

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  • Modified attapulgite preparation method
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  • Modified attapulgite preparation method

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preparation example Construction

[0021] A preparation method of modified attapulgite, which comprises the steps of:

[0022] (1) After attapulgite is pulverized, sieve through a 100-150 mesh sieve;

[0023] (2) Mix the undersize with a 20% hydrochloric acid solution in a mass ratio of 1:20-100, stir at a constant temperature of 60-80°C for at least 4 hours, then filter, wash with water, and dry to obtain acid-activated attapulgite;

[0024] (3) Mix acid-activated attapulgite, solvent and amino compound evenly according to the mass ratio of 1:50:0.4-2, stir at room temperature for 12 hours, heat to solvent reflux and maintain for more than 4 hours, and filter the mixture after cooling to room temperature , washing with ethanol, and drying to obtain amino-modified attapulgite;

[0025] (4) Mix the amino-modified attapulgite, carbon disulfide and tetrahydrofuran according to the mass ratio of 1:0.3-1.5:50 and place them in an ice bath environment, add alkaline reagents, amino-modified attapulgite and the added...

Embodiment 1

[0031] a) Attapulgite is crushed and passed through a 100-mesh sieve.

[0032] b) Mix the undersize with 20% by mass hydrochloric acid solution according to the mass ratio of 1:100 and disperse evenly, stir at 60°C for at least 4 hours; filter, wash with water, and dry to obtain acid-activated attapulgite .

[0033] c) Mix acid-activated attapulgite, toluene and 3-aminopropyltriethoxysilane in a mass ratio of 1:50:1.2, stir at room temperature for 12 hours, then heat to toluene reflux and maintain for 4 hours. After the mixture was cooled to room temperature, it was filtered, washed with ethanol, and dried to obtain amino-modified attapulgite.

[0034] d) Mix the amino-modified attapulgite, carbon disulfide and tetrahydrofuran according to the mass ratio of 1:0.9:50 and place it in an ice bath environment, add sodium hydroxide, the mass of the amino-modified attapulgite and the added sodium hydroxide The ratio is 1:2. Rapidly heated to reflux, refluxed for 2 hours, filtered...

Embodiment 2

[0042] (1) Preparation of dithiocarbamate-based adsorbent

[0043] a) Attapulgite is crushed and passed through a 120-mesh sieve.

[0044] b) Mix the undersize with 20% by mass hydrochloric acid solution according to the mass ratio of 1:60 and disperse evenly, stir at 70°C for at least 4 hours; filter, wash with water, and dry to obtain acid-activated attapulgite .

[0045] c) Mix acid-activated attapulgite, benzene and 3-aminopropyltriethoxysilane in a mass ratio of 1:50:0.8, stir at room temperature for 12 hours, then heat to benzene reflux and maintain for 5 hours. After the mixture was cooled to room temperature, it was filtered, washed with ethanol, and dried to obtain amino-modified attapulgite.

[0046] d) Mix amino-modified attapulgite, carbon disulfide and tetrahydrofuran according to the mass ratio of 1:0.6:50 and place them in an ice bath environment, add sodium hydride, the mass ratio of amino-modified attapulgite to added sodium hydride is 1:1. Rapidly heated to...

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Abstract

The present invention discloses a modified attapulgite preparation method. The preparation method comprises: modifying attapulgite activated by an acid by an amino compound to obtain an amino composite material, and modifying the amino composite material to obtain a composite material by an end modifying reagent. The obtained amino composite material is modified by the end modifying reagent to obtain the composite material. According to the preparation method provided by the present invention, the effective active functional group dithiocarbamate group is embedded into an attapulgite layer or is modified on the surface of attapulgite to form a dithiocarbamate attapulgite composite material. A plurality of active groups of the dithiocarbamate attapulgite composite material make the adsorption capacity of the composite material be extremely strong. The preparation method provided by the present invention effectively improves the capacity of adsorbents for adsorbing heavy metals, and is low in process cost, safe to use and free of secondary pollution. The modified attapulgite prepared by the preparation method is suitable for repairing heavy metal contaminated soil. The modified attapulgite is particularly excellent for adsorbing heavy metals: chromium, mercury, cadmium and lead.

Description

technical field [0001] The invention belongs to the field of soil heavy metal pollution control, and more specifically relates to a functional molecule modified attapulgite modified material for removing soil heavy metals and a preparation method thereof. Background technique [0002] There have been many outbreaks of soil heavy metal pollution in our country, resulting in excessive heavy metal content in crops, which in turn endangered the health of people who eat these crops, which has aroused widespread concern from the whole society. Since the source of pollution cannot be completely removed in a short period of time, and the heavy metals in the polluted soil cannot be metabolized in a short period of time, this is a serious problem in our country where the arable land is scarce, and the research on the control of heavy metal pollution in soil is urgent. The national "Twelfth Five-Year Plan for Environmental Protection" clearly stated that the protection of the soil envi...

Claims

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Application Information

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IPC IPC(8): B01J20/12B01J20/30B09C1/00
Inventor 丁辉王永强
Owner TIANJIN UNIV
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