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Method for preparing attapulgite/carbon composite adsorbent by one-step carbonization-activation

A carbon composite material, attapulgite technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., to achieve the effects of easy availability of raw materials, improved pore structure, and low energy consumption

Active Publication Date: 2015-01-21
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a preparation method of organically modified attapulgite adsorbent by calcination activation method. The technical problem to be solved is to improve the organophilicity of attapulgite through calcination activation and compounding, and increase the specific surface area of ​​the material to improve its organic The adsorption capacity of pollutants

Method used

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  • Method for preparing attapulgite/carbon composite adsorbent by one-step carbonization-activation
  • Method for preparing attapulgite/carbon composite adsorbent by one-step carbonization-activation
  • Method for preparing attapulgite/carbon composite adsorbent by one-step carbonization-activation

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Weigh 3gZnCl 2 Dissolve the solid in water, take 0.5g of previously pulverized attapulgite powder and 1g of cellulose, add to ZnCl 2 In the solution, stir or ultrasonically disperse evenly, immerse for 8 hours and dry to obtain the sample.

[0027] Place the dried sample in a horizontal tube furnace, raise the temperature to 450°C at 5°C / min, and keep the temperature for 30min. After cooling to room temperature, wash with 1.2mol / L hydrochloric acid solution, and then wash with hot water at 70°C until the pH is 7. After drying at 60°C, the activated composite product, attapulgite / carbon composite material, is obtained.

[0028] The BET specific surface area of ​​the resulting activated composite product is 990m 2 / g, which is higher than the specific surface area of ​​attapulgite raw ore and activated carbon (see Table 3).

[0029] Take the methylene blue solution with an initial concentration of 50mg / L as the organic pollutant, activate the composite modified attapu...

Embodiment 2

[0031] Weigh 3gZnCl 2 Dissolve the solid in water, take 0.5g of previously pulverized attapulgite powder and 1g of cellulose, add to ZnCl 2 In the solution, stir or ultrasonically disperse evenly, dry after 24 hours of immersion.

[0032] The dried samples were placed in a horizontal tube furnace, the temperature was raised to 600°C at 5°C / min, and the temperature was kept for 2h. After cooling to room temperature, wash with 1.2mol / L hydrochloric acid solution, and then wash with hot water at 70°C until the pH is 7. After drying at 60°C, the activated composite product, attapulgite / carbon composite material, is obtained.

[0033] The BET specific surface area of ​​the resulting activated composite product is 1478m 2 / g, which is higher than the specific surface area of ​​attapulgite raw ore and activated carbon (see Table 3).

[0034] Take the methylene blue solution with an initial concentration of 50mg / L as the organic pollutant, activate the composite modified attapulgite...

Embodiment 3

[0036] Weigh 1gZnCl 2 Dissolve the solid in water, take 0.5g of previously pulverized attapulgite powder and 1g of cellulose, add to ZnCl 2 In the solution, stir or ultrasonically disperse evenly, immerse for 12 hours and then dry.

[0037] The dried samples were placed in a horizontal tube furnace, the temperature was raised to 450°C at 5°C / min, and the temperature was kept for 1h. After cooling to room temperature, wash with 1.2mol / L hydrochloric acid solution, and then wash with hot water at 70°C until the pH is 7. After drying at 60°C, the activated composite product, attapulgite / carbon composite material, is obtained.

[0038] The BET specific surface area of ​​the resulting activated composite product is 1139 m 2 / g, which is higher than the specific surface area of ​​attapulgite raw ore (see Table 3).

[0039] Take the methylene blue solution with an initial concentration of 50mg / L as the organic pollutant, activate the composite modified attapulgite / carbon composit...

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Abstract

The invention discloses a method for preparing an attapulgite / carbon composite adsorbent by one-step carbonization-activation. According to the method, nature attapulgite clay with low cost and a biomass cellulose carbon source are taken as raw materials, ZnCl2 is taken as an activating agent, and the attapulgite / carbon composite adsorbent is prepared by a one-step calcination method. According to the method, amorphous carbon with an organophilic property can be supported on the surfaces of attapulgite crystals, and the specific surface area of a composite can be further greatly enlarged by activation and pore-forming effects of ZnCl2. Compared with the natural unmodified attapulgite clay, the removal rate against pollutant methylene blue in water of the composite adsorbent after activation is greatly improved. According to the method disclosed by the invention, the sources of the raw materials are extensive, the price is low, the preparation process is simple, and the reaction conditions are mild; and the adsorption capability of the attapulgite / carbon composite adsorbent prepared by the method disclosed by the invention against pollutants in water is obviously upgraded, and the attapulgite / carbon composite adsorbent can be used for advanced treatment of the organic pollutants in the water.

Description

technical field [0001] The invention relates to a low-cost modified attapulgite adsorbent method, specifically preparing attapulgite / carbon composite material adsorbent by calcination and activation to improve the attapulgite as an adsorbent for organic pollutants in sewage Adsorption capacity, the prepared attapulgite / carbon composite adsorbent can be applied to the removal of trace refractory dyes in water. Background technique [0002] Attapulgite is a natural nano-scale layered hydrated magnesium aluminum silicate mineral, which has a wide range of sources, low price, excellent physical and chemical properties, rich pore structure and certain specific surface area, and has strong resistance to inorganic metal ions. adsorption properties. Therefore, attapulgite has been widely used in various fields, including total metal ion and dye adsorbents and catalyst supports, but due to the strong hydrophilicity of the attapulgite surface, it is still poor in the adsorption perfo...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28
CPCB01J20/20B01J20/28064C02F1/281
Inventor 吴雪平程丽萍张先龙
Owner HEFEI UNIV OF TECH
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